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Copyright ©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Psychiatry. Nov 19, 2023; 13(11): 816-830
Published online Nov 19, 2023. doi: 10.5498/wjp.v13.i11.816
Management of acute carbamazepine poisoning: A narrative review
Luan Wang, Ruo-Ying Zhang, Yao Wang, Wei Liang, Tie-Gang Li, Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning Province, China
Yang Wang, Department of General Surgery, The 4th Affiliated Hospital of China Medical University, Shenyang 110032, Liaoning Province, China
ORCID number: Luan Wang (0009-0002-2386-2407); Yang Wang (0000-0002-1819-4937); Ruo-Ying Zhang (0009-0002-7653-6090); Yao Wang (0009-0005-8533-2593); Wei Liang (0009-0007-2965-0591); Tie-Gang Li (0000-0002-7913-5666).
Author contributions: Wang L, Wang Y, Zhang RY, Wang Y, Liang W, and Li TG contributed to drafting and editing of the manuscript, and approved the final manuscript.
Supported by Science and Public Welfare Research Fund of Liaoning Province, No. 2022JH4/10100075; and National Nature Science Foundation of China, No. 81772056.
Conflict-of-interest statement: The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted and entitled ‘Management of Acute Carbamazepine Poisoning: A Narrative Review’.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Tie-Gang Li, MD, PhD, Professor, Department of Emergency Medicine, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District, Shenyang, Shenyang 110004, Liaoning Province, China. litg@sj-hospital.org
Received: September 5, 2023
Peer-review started: September 5, 2023
First decision: September 14, 2023
Revised: September 23, 2023
Accepted: October 11, 2023
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Published online: November 19, 2023
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Abstract

Standard management protocols are lacking and specific antidotes are unavailable for acute carbamazepine (CBZ) poisoning. The objective of this review is to provide currently available information on acute CBZ poisoning, including its management, by describing and summarizing various therapeutic methods for its treatment according to previously published studies. Several treatment methods for CBZ poisoning will be briefly introduced, their advantages and disadvantages will be analyzed and compared, and suggestions for the clinical treatment of CBZ poisoning will be provided. A literature search was performed in various English and Chinese databases. In addition, the reference lists of identified articles were screened for additional relevant studies, including non-indexed reports. Non-peer-reviewed sources were also included. In the present review, 154 articles met the inclusion criteria including case reports, case series, descriptive cohorts, pharmacokinetic studies, and in vitro studies. Data on 67 patients, including 4 fatalities, were reviewed. Based on the summary of cases reported in the included articles, the cure rate of CBZ poisoning after symptomatic treatment was 82% and the efficiency of hemoperfusion was 58.2%. Based on the literature review, CBZ is moderately dialyzable and the recommendation for CBZ poisoning is supportive management and gastric lavage. In severe cases, extracorporeal treatment is recommended, with hemodialysis as the first choice.

Key Words: Carbamazepine poisoning; Management; Activated charcoal therapy; Extracorporeal treatment; Intravenous lipid emulsion

Core Tip: There is no effective Antidote and standard treatment management for carbamazepine (CBZ) poisoning. This paper describes and summarizes the detailed clinical evidence of the treatment and management of CBZ poisoning, including gastric lavage and activated carbon therapy, hemoplavage, hemodialysis, continuous renal replacement treatment and plasmapheresis. Finally, this paper also provides the lipid resuscitation therapy to provide help for clinical treatment. In general, this paper summarized the results of CBZ poisoning related research, and provided the best plan for CBZ poisoning treatment.



INTRODUCTION

Carbamazepine (CBZ) was discovered by Walter Schindler in 1953 and first utilized to treat partial tonic-clonic seizures in the United States in 1974[1]. Currently, CBZ is widely used for the treatment of epilepsy and peripheral neuralgia. Broad indications for the use and widespread availability of CBZ increase the risk of overdose, and CBZ intoxication accounts for a large proportion of life-threatening cases of anticonvulsant toxicity[2-4]. A systematic review of CBZ was published in 2014 by the Extracorporeal Treatments in Poisoning (EXTRIP) workgroup that provides recommendations for the use of extracorporeal treatments (ECTRs) in cases of CBZ poisoning[5]. Currently, standard management protocols are lacking and specific antidotes for acute CBZ poisoning are unavailable; thus, we reviewed and summarized the various therapeutic methods for the treatment of CBZ poisoning described in previous studies. Our goal was to provide currently available information on acute CBZ poisoning, including its management. We believe this paper will help clinicians effectively manage patients suffering from CBZ intoxication.

METHODOLOGY

A literature search was performed in the following databases: PubMed, Embase, Chinese National Knowledge Infrastructure (CNKI), and Wanfang. The search strategy, in English and Chinese, used the terms “acute” and “carbamazepine” in combination with the keywords “poisoning”, “intoxication”, “toxication”, “toxicity”, “overdose”, and “overdosage”. These search terms identified 861 records. In addition, the reference lists of the identified articles were screened for additional relevant studies, and these additional searches added three records. Non-peer-reviewed sources were also searched, including books and Internet resources, which yielded 10 records. A total of 874 records were found, which were screened based on title, author, journal name, and publication date for repeatability and relevance. We excluded papers that were duplicates, non-English or non-Chinese papers, letters to editors, and those not referring specifically to the mechanisms of action, clinical features, and management of CBZ toxicity in humans. Finally, 154 articles were considered eligible for review. The majority of papers were case reports or small case series. The literature selection process is described in Figure 1.

Figure 1
Figure 1 Flow diagram of the literature search.
PHARMACOLOGY

CBZ is an iminostilbene derivative that is structurally similar to tricyclic antidepressants and is mainly used as a potent first-line agent to treat epilepsy, including simple partial, complex partial, and general tonic-clonic seizures[6,7]. The therapeutic effects of CBZ have also been proven for the treatment of neuropathic pain, especially prosopalgia, central diabetes insipidus, attention-deficit/hyperactivity disorder, and bipolar disorder. CBZ is thought to exert its anticonvulsant effects by blocking presynaptic voltage-gated sodium channels in the central nervous system (CNS), which further prevents the release of glutamate and similar neurotransmitters, ultimately inhibiting high-frequency epileptic foci.

CBZ has a molecular weight of 236 Da and high protein binding affinity (70%-80%) for both albumin and alpha-1-acid glycoprotein. This percentage does not markedly decline, even in cases of overdose[8]. CBZ is highly lipophilic, a property that allows it to be rapidly distributed after ingestion with a moderately large volume of distribution ranging between 0.8 L/kg and 1.4 L/kg. Thus, at therapeutic doses, the immediate-release tablets and controlled-release formulation of CBZ have peak serum concentrations at approximately 6-8 h and 12-24 h post-ingestion, respectively[9-11]. However, following overdose, peak concentrations may be delayed up to 106 h[12] due to the anticholinergic properties of CBZ, which are responsible for decreased gastrointestinal (GI) motility and delayed and prolonged absorption[10,13].

CBZ metabolism predominantly and extensively occurs in the liver by epoxidation and hydroxylation reactions through the cytochrome P450 system. Only 1%–3% of the drug is not metabolized and excreted through the kidney. CBZ-10,11-epoxide is the primary active metabolite and equally produces antiepileptic and toxic effects based on its capacity to form covalent protein conjugates[14,15]. CBZ-10,11-epoxide blood concentrations vary substantially between individuals, ranging from 15% to 55% of CBZ levels in adults and from 5% to 81% of CBZ levels in children[11]. CBZ metabolism is complicated because both normal metabolism and autoinduction of metabolism occur with chronic use.

There is wide interindividual variability in the pharmacokinetics of CBZ, as well as general adaptation[16]. CBZ is eliminated according to zero-order kinetics (i.e. a constant amount of drug is eliminated per unit time) in the case of elevated plasma drug levels, as seen in overdose; however, a delay in CBZ elimination occurs when no intervention is available[16]. The reported biological half-life of the initial dose of CBZ is 25-65 h, but is shortened to 12-17 h in chronically treated epileptic patients due to self-induction[17]. Nevertheless, the half-life is apparently much longer after excessive dosing and the use of controlled-release preparations[1,12], likely reflecting delayed or continuous absorption, impaired elimination, or a combination of both.

OVERVIEW OF CBZ POISONING

Toxicity from CBZ overdose was first described by Guntelberg in 1967[18]. CBZ intoxication increasingly accounts for a large proportion of life-threatening cases among anticonvulsant poisonings[2,3]. A total of 3734 toxic exposures to CBZ were reported in 2014 by the American Association of Poison Control Centers. Of these, 1880 were isolated ingestions. There were no deaths, but 62 cases were life-threatening or severely disabling due to the significant toxicity[19].

Although the toxic concentration of CBZ in patients is not completely consistent with clinical manifestations of toxicity, doctors often initially treat patients based on the patient’s clinical status. However, serum CBZ concentration is a practical method used to confirm clinical exposure, and severe intoxication occurs at serum levels > 20 mg/L [therapeutic index range: 4-12 mg/L (17-51 μmol/L)][20]. Serum CBZ levels > 40 mg/L are generally predictive of severe toxicity[21], which potentially occurs at a lower concentration[22], especially in children[23-25], and tends to be associated with an increased risk of seizure, coma, respiratory depression, and cardiotoxicity[26,27]. In addition, the pharmacologically active metabolite of CBZ, CBZ-10,11-epoxide, contributes to the risk of toxicity[28,29]. Based on the circulating level of CBZ in blood, the effects of CBZ on the CNS can be classified into four stages: (1) Seizures and coma at levels > 25 mg/L; (2) Combativeness, hallucinations, and choreiform movements at levels of 15-25 mg/L; (3) Disorientation, drowsiness, and ataxia at levels of 11-15 mg/L; and (4) Potentially catastrophic relapse at levels < 11 mg/L[30]. The duration and severity of these stages are variable and depend upon the magnitude of the overdose[31]. The detailed clinical symptoms corresponding to the toxic dose are described in Figure 2.

Figure 2
Figure 2 Toxic dose and clinical manifestations of carbamazepine according to blood concentration. CBZ: Carbamazepine.

Toxicity usually occurs within 1-3 h after ingestion, but may be prolonged due to the delayed and erratic absorption of CBZ[32,33]. A wide diversity of clinical manifestations such as neurologic, respiratory, and cardiac findings can be seen in CBZ poisoning[22,34]. CBZ intoxication primarily manifests as CNS symptoms including nystagmus, movement disorders, disturbance of consciousness, altered mental status ranging from drowsiness to coma, and convulsions[35-39]. Seizures are not uncommon, occurring in 11%-18% of overdose cases[40,41]. Respiratory depression, a common mani-festation of severe overdose, may delineate the severity of toxicity in the respiratory system and may be complicated by concomitant aspiration. Myocardial depression, sinus tachycardia, hemodynamic instability hypotension, and cardiac conduction disturbances are characteristics of CBZ cardiotoxicity. Some rare electrocardiogram (ECG) abnormalities may also occur such as atrioventricular block, QRS interval prolongation, QTc (corrected QT time in ECG) prolongation (> 420 ms), bundle branch block, Brugada-type patterns, and premature ventricular contractions[42,43]. Death, though very uncommon (approximately 2% of cases), generally results from cardiovascular toxicity[44,45]. An overall mortality rate of 13% was documented and reported in a cohort study of 427 patients with CBZ intoxication, with an average CBZ intake in lethal cases of 23.6 g[22]. Refractory cardiovascular toxicity has also been reported[46,47].

MANAGEMENT OF ACUTE POISONING

In clinical practice, doctors initially treat patients based on their clinical symptoms, and supportive care plays a key role at this stage. For example, seizures are treated with benzodiazepines[48], hypotension is treated with vasopressors, and endotracheal intubation is used for patients with respiratory insufficiency. GI decontamination techniques such as gastric lavage (GL) and single-dose activated charcoal (AC) (SDAC) can be applied if patients are administered care within 1-2 h after ingestion without contraindications[49]. However, CBZ metabolism and distribution are complicated, and specific life-saving antidotes for CBZ poisoning are unavailable. Several modalities have been proposed to enhance CBZ clearance in patients with severe or life-threatening ingestion, including multiple-dose AC (MDAC), ECTRs, and lipid resuscitation therapy (LRT)[50].

Supportive care

Application of appropriate supportive care is adequate to deal with the vast majority of CBZ intoxication cases. Supportive care may involve airway protection with endotracheal intubation, treatment of seizures with benzo-diazepines, and correction of hypotension with fluid challenges and vasopressors, if needed. The use of hypertonic sodium bicarbonate is indicated if ECG findings (QRS duration exceeding 100 msec) show that the sodium channel is blocked.

Serum CBZ concentrations in an acute overdose should be monitored serially (typically every 4-6 h) until a definitive downward trend is observed and the patient is improving clinically[51,52]. Continuous monitoring of serum CBZ concentrations in patients is necessary, especially in those with severe poisoning. These patients are likely to deteriorate after the initial improvement of clinical symptoms or develop a delayed toxic reaction due to a rebound effect (i.e. sudden rise in serum drug concentration following intermittent treatment due to drug redistribution from tissue to serum[53]) or sustained increase in serum concentration.

Patients with significant CNS depression may lose protective airway reflexes and should be intubated, particularly due to their lower seizure threshold. Short-acting neuromuscular blocking agents (e.g., succinylcholine) are preferable so subsequent seizure activity is not masked. Induction agents with gamma-amino butyric acid agonist activity (e.g., midazolam) may be preferable, depending on the patient’s hemodynamic status.

Hypotension is initially treated with isotonic crystalloid. Caution should be exercised in patients at risk of volume overload, such as those with underlying heart disease or CBZ-induced myocardial dysfunction. Direct-acting vaso-pressors are used if intravenous fluids fail to correct the hypotension.

Sodium channel blockade may cause QRS interval prolongation, which, in other poisonings, has been shown to predispose patients to ventricular arrhythmias[54,55]. QRS prolongation due to CBZ toxicity is treated with sodium bicarbonate. Currently, there are no clearly established treatment thresholds based on QRS duration or dosing guidelines or evidence regarding the preferred method of administering sodium bicarbonate with respect to boluses, infusions, or treatment duration[56]. The proposed methods of administration are for patients with QRS intervals longer than 110 ms, particularly those with hypotension, and include boluses of a 1 mEq per 1 mL (8.4%) solution at a quantity of 1-2 mEq/kg to obtain a serum pH of 7.45-7.55 and an infusion of 150 mEq mixed with 1 L of 5% dextrose in water at a rate to maintain that pH[54]. Continuous cardiac monitoring of patients with a 12-lead ECG is simultaneously needed. Volume overload, hypokalemia, hypernatremia, and metabolic alkalosis may result from prolonged bicarbonate infusions, and clinical and laboratory parameters must be closely followed to avoid these complications.

GL

GL has been routinely used to manage cases of poisoning for more than 200 years. However, GL carries significant risks, which, given its questionable clinical benefit, usually outweigh arguments in favor of its use; thus, it is not recommended for routine GI decontamination[57]. GL works by eliminating poison remaining in the GI tract and should be considered based on the time elapsed from oral ingestion to admission to the emergency department. In cases of suspected CBZ intoxication, prior to the determination of the current plasma concentration of CBZ, it is imperative to remove undigested tablets through GL to further reduce GI absorption. This one simple measure may be particularly helpful for CBZ intoxication given its anticholinergic effects on the GI tract that would delay gastric emptying[58]. However, there is less conclusive evidence showing that GL has clear effects on CBZ poisoning[59,60]. As noted in a position statement related to GL use, GL should not be considered unless a potentially life-threatening amount of a poison is ingested by the patient, and this approach should be initiated within 60 min of ingestion[61]. Nevertheless, the clinical benefit has not been confirmed in controlled studies. Moreover, GL is not appropriate for all patients, and not all patients can benefit from GL. GL is contraindicated in patients who have impaired consciousness, recent surgery, no protection of the airway, risk of GI bleeding and perforation, and potentially increased risk and severity of aspiration[57]. The major complications of GL include perforation of the esophagus and stomach, pulmonary aspiration, and aspiration pneumonia[62].

MDAC

AC therapy is still the most frequently employed method of GI decontamination for acute drug overdoses in developed countries. With a highly developed internal pore structure, the tremendous surface area of AC permits the adsorption of drugs and toxins in the GI tract within minutes of contact, which reduces their systemic absorption and subsequent toxicity and enhances their elimination[63]. AC therapy involves SDAC and MDAC, which indicates scheduled administration of more than two small doses of AC.

MDAC should only be considered if a patient has ingested a life-threatening amount of CBZ. MDAC therapy is effective in poisoning due to three distinct mechanisms: (1) Reducing ongoing absorption of extended or delayed-release formulations remaining in the gut[49]; (2) Interfering with enterohepatic and enterogastric circulation of drugs[64-66]; and (3) Promoting the diffusion of drugs from circulation into the gut lumen and trapping them there to be discharged later in the excrement (this process is sometimes called “GI dialysis”)[67].

The “routine” use of MDAC has not been shown to reduce morbidity and mortality in poisoned patients in controlled clinical trials. However, evidence from animal and volunteer studies, as well as poisoning cases, indicates that MDAC therapy significantly enhances total body clearance and shortens the half-life of CBZ[33,68-71]. Mittag et al[19] recently reported a case of CBZ overdose in which the patient was treated with AC (1 g/kg body weight); his CBZ concentration dropped from the initial value of 41.5 mg/L to approximately 12 mg/L after 24 h. A randomized crossover study in 5 fasted volunteers performed by Neuvonen and Elonen[65] showed that the elimination of CBZ could be significantly enhanced by MDAC. In a study by Boldy et al[70] involving 15 patients with CBZ poisoning, researchers gave patients MDAC therapy and found that the mean half-life decreased to 8.6 ± 2.4 h and the mean total body clearance increased to 113 ± 44 mL/min. By comparison, the mean elimination half-life in another two groups of patients managed with supportive treatments only was approximately 19 h[8,72]; similar conclusions have been reached in other studies[73,74].

MDAC enhances the clearance of CBZ in the body and has been approved by the latest joint statement issued by the American Academy of Clinical Toxicology and the European Association of Poisons Centres and Clinical Toxicologists[64]. The statement recommends that MDAC be considered only if a patient has ingested a life-threatening amount of CBZ. In addition, several conditions are considered contradictions including an unprotected airway, the presence of intestinal obstruction, and a GI tract not anatomically intact. Attention should be paid to prevent complications such as constipation, ileus, and aspiration pneumonia in an unprotected airway, although these occurrences are rare[75].

The efficacy of AC is inversely related to the time elapsed after the ingestion of toxic substances[42,76]; thus, administration of charcoal as soon as possible yields the best results. However, the considerably delayed absorption of drugs is often noted in cases of acute poisoning due to inhibition of gastric emptying and gut motility and the limited solubility of drugs, among other reasons[21,22]. Therefore, AC administration is apparently indicated if delayed or prolonged absorption is anticipated, even after a delay of 24-48 h[75].

There is no established optimal dosage regimen for AC; however, available data indicate a dose-response relationship: An AC: Drug ratio of 10:1 or higher is considered optimal for AC adsorption[77-79]. However, the efficacy of AC is influenced by many variables, making it difficult to administer the optimum dose[63]. Consequently, in practice, a fixed dose of 1 g/kg is generally recommended with the maximum amount not exceeding 50-70 g. A flexible dose of 0.25-1.0 g/kg is used for MDAC, and the dosing interval varies based on laboratory (e.g., increasing blood concentrations) or clinical evidence for continuing drug absorption and ranges from 1 h to 4 h. Vomiting is an important factor to consider when substantial doses of AC are administered repeatedly. Continuous nasogastric infusion of AC or frequent administration of AC with smaller doses, at least following a large initial dose (50-100 g), may contribute to reduced vomiting[80,81]. In some cases, the combined use of antiemetics, such as metoclopramide or ondansetron, may have desirable effects.

ECTR

ECTR, also known as blood purification treatment, is a medical technology that removes poison from the blood by moving the blood from the patient into a purification device. ECTRs are classified based on their mechanism: Hemodialysis (HD) and peritoneal dialysis act by diffusion; hemoperfusion (HP) acts by adsorption; hemofiltration acts by convection; and therapeutic plasma exchange acts by centrifugation[82,83]. Each technique has a potentially different role in eliminating poison from the body. Whatever modality is used, optimizing ECTR characteristics to achieve maximum removal of poison is crucial; for example, higher flow rates of blood and dialysate, filters with larger surface area, and longer duration of ECTR maximize poison removal[84].

According to the EXTRIP workgroup on the use of ECTR in CBZ poisoning, ECTRs are recommended for patients with significant or potentially significant clinical poisoning because they are preferable interventions for rapidly and substantially removing CBZ[5]. Even when considering its weaknesses, such as high risks, high costs, and relative uncertainty, ECTR is generally considered by the workgroup to be worth implementing in patients with severe CBZ poisoning (as manifested by signs such as multiple refractory seizures, hemodynamic instability requiring vasopressors, or life-threatening dysrhythmias). ECTR can prevent the worsening of CBZ poisoning symptoms such as severe hypotension, as well as comatose complications associated with chronic shortness of breath such as ventilator-associated pneumonia and pulmonary emboli[5]. In addition, ECTR is expected by most participants in the workgroup to be a potentially cost-saving technique by minimizing the mechanical ventilation period and residence time in the intensive care unit (ICU), ultimately reducing ICU-related costs[5]. Whether and when to initiate ECTR should be primarily based on clinical symptoms and signs, rather than serum CBZ concentrations, although more severe toxicity apparently occurs when CBZ concentrations are > 40 mg/L[21,85]. The optimal duration of extracorporeal removal should be adjusted to the patient’s clinical condition and CBZ levels. Furthermore, the continuous and regular monitoring of CBZ serum concentrations after ECTR is essential, as concentrations may rebound[86]. If concentrations rebound to threatening levels or if there is a recurrence of toxic symptoms, another session of ECTR may be required. ECTR is recommended for patients with significant or potentially significant clinical poisoning. Intermittent HD is the preferred modality for ECTR in CBZ poisoning. Intermittent HP and continuous renal replacement modalities are alternatives if intermittent HD is not available.

HP: HP refers to anticoagulated blood that circulates through a cartridge containing adsorbent particles (AC particles or resin beads) onto which the poison can be adsorbed to achieve the goal of blood purification[87,88]. This modality is suitable for removing poisons with medium or large molecular weight, high lipid solubility, and high protein binding. CBZ is a highly lipid-soluble drug that can be rapidly distributed in tissues, and its plasma protein binding is as high as 70%-80%. Therefore, HP is historically identified as the preferred modality for extracorporeal removal in cases of severe CBZ poisoning[89-92], although the EXTRIP workgroup published a contrary opinion. Despite limitations such as early saturation of the cartridges, the successful removal of CBZ through either resin or charcoal HP has been reported with varying clearance efficiencies ranging from 25% to 55%[93-97]. In a recent study conducted by Yang et al[98], the authors concluded that the early initiation of HP during treatment of CBZ poisoning would significantly lower the serum concentration and minimize the CBZ detection time, leading to symptom relief and shortening of the overall treatment period. However, this procedure is often difficult to perform and carries risks such as thrombocytopenia, leukopenia, coagulopathy, and hypocalcemia, which are thought to be associated with cell adsorption and continuous replenishment of the AC[99,100]. Therefore, the frequent monitoring of platelet counts or application of new biocompatible polymer membranes is indispensable for decreasing these complications[101].

HD: HD takes advantage of the principle of diffusion, allowing poison to pass through a semipermeable membrane from a higher- to lower-level side to remove the poison in the blood. This modality is suitable for poisons with high water solubility, low molecular weight (< 500 D), medium molecular weight, and low protein binding. Although intermittent HP is historically preferred for the removal of CBZ, HD should be considered based on its theoretical superiority in clearing protein-bound poisons such as CBZ, and the EXTRIP workgroup recommends intermittent HD over HP. Indeed, several factors prove that HD is superior to HP. First, its clearance efficiency is superior. Although a previous study showed that HP has higher clearance than HD, the comparison was based on older, less efficient cuprophane dialyzers[5]. Recent data have shown that high-efficiency HD is almost as effective as charcoal HP and results in rapid clinical improvement[13,102-104] when equipped with a highly permeable high-flux membrane with increased dialysate flow, which produces comparable efficacy by allowing the removal of larger molecules and highly protein-bound poisons[105-109]. In addition, there is a risk of hemolysis. Blood flow circulating in cartridges during HP remains limited to 300-350 mL/min; however, the use of brand new catheters during HD enables blood flow up to 400 mL/min[110]. Furthermore, there are high amounts of free CBZ molecules and its metabolites in blood at increased concentrations, which are good candidates for removal by HD[111,112]. Second, the manipulability of HD is superior; HD is more available than HP, and HD is the preferred technique for dialysis for patients with acute kidney injury and end-stage kidney disease worldwide. Early initiation of ECTR is critical, considering that clinical improvements are likely associated with how quickly poisons can be cleared from the body. In addition, physicians and nurses are more familiar and experienced with HD; thus, this technique is more likely to be implemented with fewer delays and uncertainties. Third, outcomes of HD are superior; complications are less likely to occur with HD than with HP[113]. Finally, HD has a favorable cost compared with HP. A recent investigation of availability, time to initiation, and cost of ECTR in acute settings worldwide confirmed the lower cost of HD compared with other ECTRs (median cost ratio of HP:HD = 1.7)[114]. The high spending associated with HP is largely due to multiple replacements of expensive charcoal cartridges because of its easy saturation, which would decrease poison clearance[12,91]. Moreover, monitoring and treating complications of HP contribute to its high expenses.

Continuous renal replacement treatment: Continuous renal replacement treatment (CRRT), also known as continuous blood purification, is a treatment involving the continuous, slow removal of water and solutes. CRRT includes continuous venovenous HD, continuous venovenous hemodiafiltration (CVVHDF), and continuous venovenous hemofiltration[115]. These continuous therapies are usually performed in the ICU to facilitate management of hemodynamically unstable patients who cannot withstand high-efficiency intermittent treatments. Therefore, lower dialysate rates during CRRT (up to 10 L/h) than the dialysate flow rates used in intermittent HD (500–800 mL/min) are routinely offered, leading to markedly lower clearance[5]. However, CRRTs play a better role in mitigating rebound effects than intermittent techniques, regardless of the drug clearance rate. Numerous studies are available documenting the use of CRRTs in patients with CBZ intoxication; however, techniques and outcomes vary substantially. Thus, the benefits of these techniques to eliminate CBZ from the body are unable to be determined[89,116-119]. Consequently, continuous techniques are regarded as low-priority modalities by the EXTRIP workgroup and are only advocated when intermittent treatments are unavailable (because of technical or personnel reasons in critical care settings). Nevertheless, some authors approve of the joint use of intermittent procedures and CRRTs in patients with poisoning to avoid “rebound phenomenon”.

Recently, the addition of albumin to the dialysate appeared to improve CBZ clearance compared with conventional CRRT in some studies[120-124]. In a study conducted by Choi et al[122], the applied CVVHDF showed a 24% increase in CBZ clearance when using dialysate with the addition of 20% albumin. Another in vitro study using modeled continuous HD performed in 2009 also confirmed that CBZ clearance was significantly enhanced with 2.5% or 5% albumin-supplemented dialysate compared with control (albumin-free) dialysate[123]. This technique could be explained by basic principles of thermodynamic protein-binding affinity and solute movement along a concentration gradient. The albumin added to the dialysate works as a “sink” to bind CBZ that moves across the dialyzer membrane along the concentration gradient formed between the blood side and dialysate side[124]. However, extremely high costs have limited their widespread use. In addition, whether these procedures have superiority to either HP or HD remains unclear and further investigation is needed.

LRT

LRT is a relatively new method to improve the clinical manifestations of toxicity from overdose of certain drugs through administration of intravenous lipid emulsions (ILEs). ILE was conventionally used for parenteral nutrition and first applied in 1998 by Weinberg and colleagues[125] as a treatment option in toxicology. The first human case of ILE clinical use was reported by Rosenblatt et al[126] in 2006 to treat local anesthetic (bupivacaine) systemic toxicity. Since then, ILEs have been widely used in clinical toxicology as a life-saving treatment for local anesthetic-induced cardiotoxicity[127]. With further research, the field has expanded progressively with successful clinical translation and expansion of use to treat other types of non-local anesthetic lipophilic drug overdoses[128-132].

The ILE mechanisms of action are not entirely clear but can be partially explained by dynamic scavenging/partitioning and direct cardiovascular effects[133,134]. In 1998, Weinberg and colleagues originally proposed a mechanistic hypothesis, namely, that ILE provides a novel compartment into which lipophilic drugs circulating in the blood are able to partition, preventing them from affecting other organs. This theory was widely accepted and referred to as “the lipid sink”. However, with improved understanding of this treatment, a “lipid shuttle” or a capture/release mechanism has been suggested in which ILEs play a role in accelerating the redistribution of drugs and moving drugs around, as opposed to acting like a “lipid sink” that catches and segregates drugs[135]. In addition, ILEs exert direct effects on myocardial tissue that improve cardiac output; however, the relevant potential mechanisms are not fully understood[136,137]. Based on these mechanisms of action, ILEs have been used to manage toxicity from non-local anesthetic lipophilic drugs.

CBZ is a highly lipophilic molecule and can induce cardiotoxicity in cases of significant overdose. ILEs have been administered to treat CBZ intoxication in several cases with varying results[116,138-141]. ILE treatment was used in two case reports for CBZ-induced cardiotoxicity and showed beneficial effects[138,139]. In a retrospective study investigating the clinical effects of lipid emulsion for the treatment of childhood CBZ poisoning, researchers enrolled 48 patients and divided them into Group A (lipid emulsion + HP) and Group B (HP); a statistically significant difference was not observed in the blood concentration of CBZ between groups (P > 0. 05). After 24, 48, and 72 h of treatment, the CBZ blood concentration in Group A was significantly lower than that in Group B (P < 0.05), and the researchers concluded that the lipid emulsion could be used for the treatment of CBZ poisoning in children to reduce the blood CBZ concentration as quickly as possible[142]. Although the sole effect of ILE in CBZ clearance has not been proven, ILE is still considered to be a potentially beneficial alternative to ECTR methods in CBZ intoxication. Whether and when to initiate LRT is discretionary and depends on the clinical judgment of the treating physician. Blood clotting and fat deposition commonly occur in extracorporeal circuits when combined with LRT[140,141], and thus should be monitored during therapy.

DISCUSSION

We conducted a retrospective review of selected literature. The case reports contained detailed data describing patient status and treatments, and an aggregate description was made (Table 1). After discussion and analyses of CBZ poisoning cases, we established recommendations for the treatment of CBZ poisoning (Table 2); 67 patients were included and no randomized controlled trials were identified. The median CBZ peak concentration was 39.0 mg/L and the median age was 42.3 years. Notably, all patients had varying degrees of consciousness impairment, which were due to individual differences. In addition, some patients experienced respiratory depression, dysrhythmias, hypotension, seizures, or a combination of these symptoms. Among the patients, 32 showed varying degrees of respiratory depression. Overall, 4 cases were described as deaths caused by CBZ poisoning rather than the effect of the treatment[43,44,105]. GL is a simple and convenient treatment, but only 6 patients received GL because the treatment is prohibited in patients with impaired consciousness, recent surgery, no airway protection, risk of GI bleeding and perforation, or potential for increased risk and severity of aspiration[16,19,21,23,26,28]. In these situations, considering the patient’s economic conditions and affordability, MDAC was chosen instead of GL. For decades, MDAC has been used as a universal antidote for the majority of poisons because of its ability to prevent absorption of the most toxic agents from the GI tract and enhance the elimination of some agents already absorbed[143,144]. The optimum dose of MDAC is difficult to precisely determine for an individual patient. Optimum dosage depends on many variables such as the volume and pH of gastric and intestinal fluid, and the presence of other agents or food absorbed by AC[145-148]. Notably, repeated administration is still effective against substances that stay longer in the stomach, which is another advantage of MDAC. The recommended dose for adults is typically 50 g; however, the amount administered to children is determined based on body weight (0.5-1 g/kg). Reported complications and adverse effects of MDAC include diarrhea, constipation, vomiting, pulmonary aspiration, and intestinal obstruction. Consequently, MDAC should be used with caution in the following situations: unprotected airway; presence of intestinal obstruction; or GI tract not anatomically intact. Therefore, intestinal motility in patients receiving MDAC should be continuously monitored as necessary to maintain electrolyte and water balance.

Table 1 Clinical outcomes of the 67 patients described in the case reports.
Patient demographics
Values
Median age (yr)25 (1.5-85)
Male sex49.3
Poisoning exposure
Mean peak carbamazepine concentration in mg/L39.0 (17.7-93.8)
Clinical symptoms and signs
Respiratory depression47.8
Decreased consciousness100
Seizure20.9
Hypotension14.9
Dysrhythmias19.4
Treatment measure1
Supportive care9.0
Gastric lavage29.9
Multiple-dose activated charcoal58.2
Hemoperfusion22.4
Hemodialysis22.4
Continuous renal replacement treatment12.0
Plasma exchange and plasmapheresis4.5
Lipid resuscitation therapy4.5
Outcome
Recovery82.0
Sequelae12.0
Fatalities6.0
Table 2 Executive summary of recommendations for the treatment of carbamazepine poisoning.
General statement
    The primary treatment for CBZ poisoning is GL
    A mainstay of treatment is multiple-dose activated charcoal
    ECTR is suggested in cases of severe CBZ poisoning
    Intermittent hemodialysis is the preferred ECTR for CBZ poisoning
    Lipid resuscitation therapy is an effective adjunctive treatment to ECTR
Supportive care
    Severe central nervous system depression requires endotracheal intubation
    To avoid masking subsequent seizures, short-acting neuromuscular blockers are recommended
    Isotonic crystalloid to correct hypotension should be considered first; when isotonic crystals do not work, direct-acting vasopressors can be applied
    QRS prolongation is treated with sodium bicarbonate
Management precautions
    GL is contraindicated when patients have impaired consciousness, recent surgery, no protection of airway, risk of gastrointestinal bleeding and perforation, and the potential for increased risk and severity of aspiration
    Multiple-dose activated charcoal should be used with caution in cases of an unprotected airway, presence of intestinal obstruction, or gastrointestinal tract not anatomically intact

HP was the most common treatment for the patients in our review, accounting for 58.2% of cases. HP was considered the most timely and effective treatment for patients with excessive CBZ toxicity and life-threatening symptoms because it can remove mid-to-large-sized toxin molecules bound to proteins. However, the earlier enthusiasm for HP has decreased and HD is currently the treatment of choice for poisoned patients. HP presents some challenges compared with HD. For example, HP is associated with more complications than HD (namely, hypocalcemia, leucopenia, thrombocytopenia[147,148]), and the rate of complications is greater during HP than HD. Furthermore, HP is more expensive and results in the early saturation of columns. Notably, the same percentage of patients received HD and CRRT therapy (22.4%). HD and CRRT are commonly used to provide renal support to critically ill patients with acute kidney injury, particularly those who are hemodynamically unstable. Although initially developed as an arteriovenous therapy, most CRRT is now performed using pump-driven venovenous extracorporeal circuits. However, initiation of CRRT requires vascular access, which is generally established through placement of a large-bore double lumen catheter in an internal jugular, femoral, or subclavian vein. Furthermore, hypotension during CRRT is common, occurring in some series in more than one-third of patients, but is most often unrelated to the CRRT procedure. Increased hemodynamic instability due to ultrafiltration may be the most likely treatment-related factor contributing to hypotension[149]. Therefore, we conclude that in the absence of accurate, scientific data indicating effectiveness and risk, a sound recommendation for the use of CRRT cannot be made. Again, the treating physician must weigh the theoretic benefit against the potential for complications in each clinical scenario. HD is indicated for the therapeutic management of acute poisoning or drug overdose and is the most commonly favored extracorporeal technique in poisoning situations due to its availability, cost, and safety profile. With the development of science and technology, the advent of high-efficiency, high-flux dialyzers has rendered other techniques, such as HP, almost obsolete. Furthermore, HD enables the correction of acid-base and electrolyte abnormalities.

Among patients, plasma exchange and plasmapheresis as well as lipid emulsion were the least frequent (both 4.5%). Plasma exchange and plasmapheresis refer to the extracorporeal technique preformed in an apheresis device where the patient’s plasma is separated from whole blood and removed, and the cellular blood components are returned to the patient together with a replacement fluid[150]. Therapeutic procedures commonly include therapeutic plasma exchange and red blood cell exchange with or without depletion, in addition to more specialized procedures, such as low-density lipoprotein (LDL) apheresis and extracorporeal photopheresis, which was widely used in China to treat patients with coronavirus disease 2019[151]. However, because performing extracorporeal photopheresis is complex and requires precision, the method is rarely used in drug intoxication cases. The mechanism of action in LDL apheresis creates an expanded, intravascular lipid phase in which equilibria are established that drive the offending drug from target tissues into the newly formed “lipid sink”. Based on this theory, LDL has been considered a candidate for generic reversal of toxicity caused by overdose of any lipophilic drug. However, the use of LDL apheresis requires caution, especially in patients with a history of hypersensitivity to lipid emulsion or ingredients (e.g., eggs, soy), severe sepsis, severe liver disease, acute pancreatitis, and acute myocardial infarction. Therefore, we suggest that LDL apheresis be considered under circumstances of refractory hemodynamic instability.

CONCLUSION

Herein, we presented recommendations for therapies in CBZ poisoning. Risk assessment of selected case reports showed that in most poisoned patients, general supportive measures usually suffice, including airway management and protection, ventilatory support, fluid resuscitation, correction of electrolyte and acid-base disorders, and management of poison-related hypo/hyperthermia. Primary GI decontamination with AC and routine GL are widely used. Aggressive ECTR is required for rapid and substantial removal of CBZ and its metabolites when clinical symptoms and signs are serious or deteriorated. Choice of ECTR modality should be based on clearance efficiency, availability, cost, and complications. Among the various ECTRs available, HD provides the best expected removal for CBZ poisoning with the lowest incidence of complications and should therefore be the preferred modality in most cases.

Footnotes

Provenance and peer review: Unsolicited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Psychiatry

Country/Territory of origin: China

Peer-review report’s scientific quality classification

Grade A (Excellent): 0

Grade B (Very good): B

Grade C (Good): C

Grade D (Fair): 0

Grade E (Poor): 0

P-Reviewer: Chudzik A, Poland; Keeler J, United Kingdom S-Editor: Lin C L-Editor: A P-Editor: Chen YX

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