Case Report
Copyright ©The Author(s) 2015. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Apr 7, 2015; 21(13): 4069-4077
Published online Apr 7, 2015. doi: 10.3748/wjg.v21.i13.4069
Gastroenterology case report of mesalazine-induced cardiopulmonary hypersensitivity
José Ferrusquía, Isabel Pérez-Martínez, Ricardo Gómez de la Torre, María Luisa Fernández-Almira, Ruth de Francisco, Luis Rodrigo, Sabino Riestra
José Ferrusquía, Isabel Pérez-Martínez, Ruth de Francisco, Luis Rodrigo, Sabino Riestra, Department of Gastroenterology, Central University Hospital of Asturias, 33011 Oviedo, Asturias, Spain
Ricardo Gómez de la Torre, María Luisa Fernández-Almira, Department of Internal Medicine, Central University Hospital of Asturias, 33011 Oviedo, Asturias, Spain
Author contributions: Ferrusquía J and Pérez-Martínez I drafted the manuscript; Gómez de la Torre R, Fernández-Almira ML, de Francisco R and Riestra S critically reviewed the manuscript; all authors read and approved the final manuscript.
Ethics approval: The study was reviewed and approved by the Central University Hospital of Asturias research ethics committee.
Informed consent: All study participants, or their legal guardian, provided informed written consent prior to study enrollment.
Conflict-of-interest: Sabino Riestra has not received fees for serving as a speaker, a consultant or an advisory board member for any organizations.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (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: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Sabino Riestra, MD, Department of Gastroenterology, Central University Hospital of Asturias, Avenida de Roma s/n, 33011 Oviedo, Asturias, Spain. sriestram7@hotmail.com
Telephone: + 34-985-108000
Received: September 2, 2014
Peer-review started: September 3, 2014
First decision: October 29, 2014
Revised: November 27, 2014
Accepted: January 21, 2015
Article in press: January 21, 2015
Published online: April 7, 2015

Abstract

Mesalazine is a 5-aminosalicylic acid derivative that has been widely used to treat patients with inflammatory bowel disease. Accumulating evidence indicates that mesalazine has a very low rate of adverse drug reactions and is well tolerated by patients. However, a few cases of pulmonary and cardiac disease related to mesalazine have been reported in the past, though infrequently, preventing clinicians from diagnosing the conditions early. We describe the case of a 32-year-old man with ulcerative colitis who was admitted with a two-month history of persistent fever following mesalazine treatment initiated 14 mo earlier. At the time of admission, mesalazine dose was increased from 1.5 to 3.0 g/d, and antibiotic therapy was started with no improvement. Three weeks after admission, the patient developed dyspnea, non-productive cough, and chest pain. Severe eosinophilia was detected in laboratory tests, and a computed tomography scan revealed interstitial infiltrates in both lungs, as well as a large pericardial effusion. The bronchoalveolar lavage reported a CD4/CD8 ratio of 0.5, and an increased eosinophil count. Transbronchial biopsy examination showed a severe eosinophilic infiltrate of the lung tissue. Mesalazine-induced cardiopulmonary hypersensitivity was suspected after excluding other possible etiologies. Consequently, mesalazine treatment was suspended, and corticosteroid therapy was initiated, resulting in resolution of symptoms and radiologic abnormalities. We conclude that mesalazine-induced pulmonary and cardiac hypersensitivity should always be considered in the differential diagnosis of unexplained cardiopulmonary symptoms and radiographic abnormalities in patients with inflammatory bowel disease.

Key Words: Eosinophilia, Mesalazine, Pericardial effusion, Lung hypersensitivity, Ulcerative colitis

Core tip: We report a case of lung and cardiac hypersensitivity caused by mesalazine therapy in a patient with ulcerative colitis. Despite a few previously reported mesalazine-induced cardiac and pulmonary hypersensitivity cases, both entities are extremely infrequent making it difficult for the clinician to recognize these conditions during their early stages. An early diagnosis of these entities is extremely important, as the treatment consists of mesalazine suspension, usually resulting in a complete resolution of symptoms.



INTRODUCTION

Mesalazine, a 5-aminosalicylic acid derivative, is a medication widely used in the management of inflammatory bowel disease (IBD). The precise mechanism of mesalazine action remains poorly understood. However, it has been proposed that the drug acts locally on the colonic mucosa reducing inflammation through a variety of anti-inflammatory processes. These processes include the inhibition of proinflammatory cytokines (interleukin-1, -2, and -8 and tumor necrosis factor-α), the induction of the proliferator activated receptor-γ gene expression, or mesalazine acting as a potent antioxidant and free-radical scavenger[1]. The use of sulfasalazine in the treatment of IBD has been limited by the side effects, most of them secondary to the sulfapyridine component[2]. On the other hand, the use of mesalazine is usually well tolerated by patients, due to its favorable safety profile. Due to a limited number of cases of mesalazine-induced pulmonary disease and pericardial effusion, it has been difficult for clinicians to diagnose these diseases early. We describe the case of a patient with ulcerative colitis (UC) who, due to mesalazine treatment, simultaneously developed lung disease, pericardial effusion, and severe eosinophilia.

CASE REPORT

A 32-year-old non-smoking man with a 16-mo history of extensive UC treated with mesalazine (1.5 g/d) since the initial UC diagnosis and azathioprine (150 mg/d) for the last 13 mo was admitted to the hospital with a 2-mo history of asthenia, fever and night sweats. Prior to the appearance of the symptoms, UC was in clinical remission. Laboratory tests showed microcytic hypochromic anemia, a normal WBC count, and an increase in the erythrocyte sedimentation rate (91.0 mm/h) and the C-reactive protein level (10.3 mg/dL). Both chest radiograph and electrocardiogram were normal. At the admission, mesalazine dose was increased to 3 g/d. Blood, urine and stool samples were collected for culture prior to a 10-d course of intravenous antibiotic treatment with ciprofloxacin and metronidazole. Nevertheless, the patient continued to be febrile resulting in termination of the antibiotic therapy. Cultures drawn at admission, as well as serologic testing for human immunodeficiency virus, were all negative. A rectosigmoidoscopy showed no evidence of disease activity. A computed tomography (CT) scan of the chest revealed the presence of centrilobular pulmonary nodules in the left lower lobe and lingula, as well as mediastinal and axillary lymphadenopathy.

After a few days of hospitalization, a progressive increase in the WBC and eosinophil counts were detected in peripheral blood. Three weeks after admission, a blood test showed a WBC count of 12.6 × 109/L and a severe eosinophilia of 7.8 × 109/L (62.3%). Immunoglobulins (IgA, IgG and IgM) and complement levels were normal. Rheumatoid factor, anti-citrullinated peptide antibodies, and anti-nuclear antibodies were all negative, while the anti-neutrophil cytoplasmic antibody exhibited a positive cytoplasmic staining pattern (titer, 1:160). During this time, our patient developed clinical symptoms of dyspnea, a non-productive cough, and thoracic pain. A second CT scan was performed, revealing the presence of a patchy ground glass opacification, centrilobular pulmonary nodules extending to both inferior lobes, and a 33.6-mm pericardial effusion not previously present (Figure 1A and B). An echocardiogram showed a large pericardial effusion with no signs of hemodynamic instability. Additionally, pulmonary function testing revealed a marked decrease of 66.8% in the diffusion capacity for carbon monoxide (DLCO). The tuberculin skin test revealed no induration, and the QuantiFERON TB-Gold test was also negative. Bronchoscopy findings reported an inflammatory stenosis of the left principal bronchia. The bronchoalveolar lavage (BAL) showed an eosinophilia of 72.0%, with CD4 and CD8 counts of 29.0 and 56.0%, respectively (CD4/CD8 ratio: 0.52). Transbronchial biopsy examination demonstrated the presence of a dense eosinophilic infiltrate throughout the interstitium, alveolar spaces, and capillaries, consistent with eosinophilic pneumonia, but no indication of necrosis or granulomas (Figure 2).

Figure 1
Figure 1 Radiograph of the chest and computed tomography scan before and after mesalazine suspension. A: Chest radiograph showing an enlarged cardiac silhouette due to a cardiac effusion during mesalazine treatment; B: Computed tomography (CT) scan of the chest revealing cardiomegaly due to a large pericardial effusion (maximum width of 33.6 mm) during mesalazine therapy; C: Normal chest radiograph after mesalazine withdrawal; D: CT scan of the chest showing a complete resolution of the pericardial effusion after suspension of mesalazine.
Figure 2
Figure 2 Transbronchial biopsy of the left inferior pulmonary lobe. A: An eosinophilic infiltrate throughout the alveolar septa, alveolar spaces and capillaries (HE stain, × 40); B: An eosinophilic infiltrate in the interior of capillaries (HE stain, × 100).

One month after admission, mesalazine-induced eosinophilic pneumonia, pericardial effusion and severe eosinophilia were suspected. Consequently, mesalazine was withdrawn, and therapy with prednisone was initiated. A few days after discontinuation of mesalazine, our patient had a quick and significant clinical improvement as indicated by normalization of the hemoglobin level and eosinophil count. In addition, a chest radiograph and a CT scan of the thorax revealed a complete resolution of the mediastinal and axillary lymphadenopathy, pericardial effusion, pulmonary nodules and infiltrates (Figure 1C and D). Despite continuous reduction in the DLCO (73.5%) 6 mo after discontinuation of mesalazine, our patient remained completely asymptomatic and capable of conducting a fully active life.

DISCUSSION

Clinicians treating patients with IBD exhibiting pulmonary symptoms face multiple causes for the onset of these symptoms. A respiratory involvement as an extraintestinal manifestation of UC (serositis, sarcoidosis, interstitial lung disease, or pulmonary embolism) should be taken into consideration. Furthermore, lung infections, triggered or worsened by the immunosuppressive medication, as well as pulmonary adverse reactions induced by the drugs used to treat the underlying disease, should also be considered as the underlying cause of the pulmonary symptoms in IBD patients[3].

The use of sulfasalazine has been related to multiple adverse drug reactions (ADRs), hence, mesalazine has become the first-line treatment for the induction and maintenance of remission of mildly to moderately active UC[2]. Although mesalazine is usually well tolerated by patients, some serious ADRs like hepatitis, blood dyscrasias, pancreatitis, and interstitial nephritis have been reported[4]. Mesalazine-induced pulmonary side effects are rare, and its pathogenesis is not well understood. Nevertheless, it is thought that two mechanisms may be responsible for these side effects: (1) a toxicity mechanism that could be dose-dependent; and (2) an immunologic mechanism that might be dose-independent[5,6].

Typical mesalazine-related side effects, which include fatigue, non-productive cough, fever, dyspnea and chest pain[7], usually appear after 1-6 mo of treatment. In very rare cases, patients treated with mesalazine exhibited side effects as early as a few days or several years after the treatment[6]. Laboratory tests may reveal peripheral eosinophilia while pulmonary nodules and an interstitial infiltrate with a ground glass pattern are usually seen in the chest radiograph or CT scan. If performed, the BAL frequently shows an elevated count of eosinophils or lymphocytes, and a reduction of the CD4/CD8 ratio. In addition, pulmonary function tests usually demonstrate a reduced DLCO. Histopathologic findings include interstitial lymphocytic infiltrates, alveolar eosinophilic infiltrates, alveolar fibrosis, and non-necrotizing granulomas[5].

Differentiating mesalazine-induced lung disease from IBD-related pulmonary manifestation, as well as establishing a diagnosis, is challenging. It is known that mesalazine-induced lung disease usually affects the lung parenchyma[8], whereas the IBD-related pulmonary manifestations typically involve the upper respiratory tract[9]. If the diagnosis remains unclear, a lung biopsy should be considered in order to exclude other conditions. Preferably, the presence of eosinophilia in peripheral blood, BAL, or lung tissue should be used as indicators for diagnosing mesalazine-induced lung disease. Otherwise, diagnosis should be based on clinical presentation, exclusion of other causes of lung disease, and a trial of drug discontinuation. One case reported a complete resolution of the symptoms after the reduction of the mesalazine dose[6]. In patients with severe respiratory symptoms or with a lack of improvement after mesalazine withdrawal, glucocorticoid therapy with prednisone (1 mg/kg per day) should be considered. Reintroduction of mesalazine is not usually recommended. Nonetheless, cases have been reported where rechallenge did not produce recurrence of pulmonary symptoms[10-12].

Thirty-eight cases of mesalazine-induced pulmonary disease were found in the literature. The principal characteristics of those cases are summarized in Table 1. There were 18 men (46.2%) and 21 women (53.8%) with a mean age of 42 years (range: 10-72 years) at the onset of symptoms. Thirty-three of them were diagnosed with UC (84.6%) and six had Crohn’s disease (15.4%). Mesalazine dose at the onset of symptoms varied from 750 mg to 4.8 g/d. The time between initiation of mesalazine treatment and the onset of pulmonary symptoms ranged from two days to 4-5 years. The most common symptoms were non-productive cough, fever and dyspnea, which were present in 74.0%, 72.0% and 64.0% of the patients, respectively. Eosinophilia in peripheral blood was reported in 18 patients (46.0%), and pulmonary infiltrates with an interstitial pattern were the most frequent radiologic finding, appearing in 73.0% of patients. Similarly, eosinophilic pneumonia was the most common histologic finding, appearing in 41.0% of the biopsies. Mesalazine was suspended in 38 patients (97.4%), and 23 of them (60.5%) received systemic glucocorticoids as part of the treatment. Rechallenge was tried in seven patients, but recurrence was only seen in four of them (57.1%).

Table 1 Summary of previously published cases of mesalazine-induced pulmonary hypersensitivity in patients with inflammatory bowel disease.
Ref.Age (yr)/sexDiseaseDaily doseDuration of therapy1SymptomsEOSRPHFCD4/CD8BALDLCOSteroid therapyRechallenge /recurrence
Le Gros et al[21]54/FUC750 mg5 dT, RNDINDRatio: 0.95Mo: 63% L: 35% E: 1.5%53%NoNo
Welte et al[22]67/MUC1 g IR10 dD, DC, RNDINDNDNDNDYesNo
Reinoso et al[3]64/FUC3.6 g2 yrT, D, DCNDINDNDNDNoNo
Lagler et al[23]66/MUC1.5 g3.5 moD, DCNoILPNDMo: 30% L: 67%54%YesNo
Honeybourne et al[24]30/FUC1.6 g7 moT, D, DC, CPYes 16%NDEPNDNDNDNoNo
Declerck et al[25]45/FUC3 g3 moDNoINDNDMo: 45% L: 38% E: 11%NDNoNo
Muzzi et al[10]60/FCD2.4 gNDT, D, DCNoINDCD4: 56% CD8: 31% Ratio: 1.80Mo: 40% L: 55% E: 3%NDNoYes/No
Bitton et al[26]32/FUC4 g9 moT, D, DCYes 8.9%NDLP/IFNDNDNDYesNo
Sviri et al[27]49/MCD3 g3.5 moT, D, DCNoILP/IFNDL: 60% E: 10%80%YesYes/Yes
Lázaro et al[28]60/MUCND4 wkT, D, DCYesIIPNDMo: 80% L: 8% E: 10%67%NoNo
Pascual-Lledó et al[29]64/FCD3 g2 moD, DC, CPNoINLNDNDNDNo2No
Sesin et al[30]72/FUC1.6-2.4 g32 moT, D, CP, PCNoND4NDNDNDNDNoNo
Tanigawa et al[31]35/FUC1.5 mg40 dT, DCYesIEPCD4: 44% CD8: 34% Ratio: 1.3Mo: 44% L: 49% E: 7%NDNoNo
Guslandi et al[32]29/FUC3 g2 dD, CPNoNDNDNDNDNDNoYes/Yes
Facchini et al[33]15/MUC2.8 g4 moD, DCNoANDNDNDNDYesNo
Zamir et al[34]23/FUCND6 wkF, DCYesNDNDNDNDNDYesNo
Saltzman et al[35]53/FUCND4 moT, DC, RYes 27%AEPNDE: 79%NDYesNo
Haralambou et al[36]18/FUC1.6 g P.O. + 4 g (enema)2 moT, D, DC, CPYes 88%IBONDNDNDYesNo
Sossai et al[6]70/FUC2.4 g3 moD, DCNoIIPRatio: 0.39Mo: 40% L: 60%NDNoN/A5
Pérez et al[37]50/MUC4 g2 moT, D, DCNDNDEPNDNDNDYesNo
Foster et al[5]44/MCD2.4-4.8 g15 moT, D, DCNoAIP/IFNDN: 73%NDYesNo
30/FUC4.8 g2 yrT, D, DC, CPNoAIP/IFNDN: 43%NDNoNo
29/FUC3.6 g8 moT, D, DCNoAIPNDND19%YesNo
Hakoda et al[38]30/MUC2.25 g4 wkT, DCYesNDEPNDNDNDYesNo
Actis et al[39]57/MUCND2 yrT, D, DC, CPNoANDNDNDYesNo
Kohli et al[40]10/FUC3.2 g2 wkT, D, DCYes 12%IIPNDNDNDYesYes/Yes
Katsenos et al[41]18/MUCND1 yrT, PCYesINDNDMo: 15% L: 20% E: 60%NDYesNo
Price et al[11]28/FUC1.2 g4-5 yrT, PCYesBNDNDN: 95%NDYesYes/No6
Iannone et al[42]32/FUCND4 moT, DCNoINDNDND74%YesNo
Cilloniz et al[43]14/MCD3 g8 moCPNoIIPNDMo: 68% L: 27%93%YesNo
Park et al[44]35/MCD4 g3 moT, DCYes 32%IEPCD4: 54% CD8: 41% Ratio: 1.3L: 31% E: 41%NDNoNo
Shimizu et al[45]50/FUCND4 wkT, DCNDNDNDNDL: 58% E: 20%NDNoNo
Sposato et al[46]42/MUC3.2 g8 dT, CPYes 14%INDNDMo: 13% E: 47% N: 34%NDYes7No
Lamsiah et al[47]57/FUCND (enemas)3 moT, D, DCYesINDNDNDNDYesYes/Yes8
Kevans et al[48]17/MUC4 g3 moD, DC, CPYes 23%ANDNDNDNDYesNo
Abraham et al[49]65/MUC4.8 g2 wkT, D, DC9NoILP/IFNDNDNDYesNo
Kim et al[50]30/FUC1 g IR19 dPCYes 24%IEPNDMo: 73% N: 19%NDYesNo
Michy et al[12]72/MUCND4 moDYesNDEPNDL: 23% N: 28% E: 14%NDYesYes/No10
Current case32/MUC1.5-3 g314 moT, D, DC, CPYes 62%IEPCD4: 29% CD8: 56% Ratio: 0.51E: 72%67%YesNo

Cardiac disease as an extraintestinal manifestation of IBD is very rare. When it does occur, acute pericarditis is the most frequent form of presentation[13], but myocarditis, pericardial effusion, and cardiac tamponade have also been described[14,15]. Conversely, most cases of cardiac disease in patients with IBD are drug induced and, even when its pathogenesis is unclear, the consideration is that an idiosyncratic hypersensitivity reaction and a drug-induced lupus-like syndrome mechanism are related[16]. Although most cases of mesalazine-induced cardiac hypersensitivity in IBD patients are not severe, life-threatening complications have been reported[17]. The treatment for the condition consists of mesalazine suspension and administration of non-steroidal anti-inflammatory drugs or corticosteroids, taking into consideration that the former may exacerbate the underlying IBD in some patients[18]. Table 2 summarizes the principal characteristics of previously published cases of mesalazine-induced cardiac hypersensitivity in patients with IBD.

Table 2 Summary of previously published cases of mesalazine-induced cardiac hypersensitivity in patients with inflammatory bowel disease.
Ref.Age (yr)/sexDiseaseDaily doseDuration of therapySymptomsCardiac diseasePharmacologic treatmentRechallenge /recurrence
Vayre et al[51]53/MCD500 mg8 yrT, CPAP, PEPrednisoloneNo
Ishikawa et al[16]17/MUC1.5 g2 wkT, CPAP, PEPrednisoloneYes/Yes
Doganay et al[52]21/MUC2 g10 dT, DAMBudesonideNo
García-Morán et al[17]39/MUC4 g P.O. + 2 g (enemas)2 dT, CPAM, AMIMethylprednisoloneNo
Martín et al[53]22/MUC3 gNDCPAMCorticosteroidsNo
Cappell et al[15]32/MUCND10 yrT, CP, DChronic pericarditis, PTPrednisoneNo
Bernal-Sprekelsen et al[54]54/MUC1.5 g3 wkT, CPAP, PEASAYes/Yes1
Freeman et al[55]26/MUC1.6 g3 wkT, CPAMHydrocortisoneYes/No2
Sierra Ausín et al[56]47/MUC3 g P.O. + 1 g (enemas)3 wkT, CPAPNSAIDsNo
Park et al[57]26/MUC2.4 g1 moT, CPAM, PEASA, prednisoloneYes/Yes
Calafat et al[13]37/MUC1 g IR1 moCPAP, PEASANo
37/FUC3g2 wkCPAP, PEAnalgesicsNo
Sonu et al[58]20/FUCSulfasalazine 2 g + mesalazine (enemas)33 wkCPAM, PTIbuprofen and colchicineYes/Yes4
Current case32/MUC1.5-3 g514 moT, CP, DAP, PEPrednisoneNo

The Naranjo algorithm scale[19] was used to assess the probability of ADRs. The Naranjo algorithm scale is a questionnaire designed to determine the likelihood of whether ADRs are secondary to a drug rather than the result of other factors. ADRs of ≥ 9 points were considered to be definite, probable at 5-8 points, possible at 1-4 points, and doubtful at 0 points. Our patient scored 8 points, suggesting probable ADRs. However, due to the presence of eosinophilia in the peripheral blood, BAL and lung biopsy, the patient’s deteriorating condition following mesalazine treatment followed by a significant improvement after discontinuation of mesalazine therapy, all strongly support our diagnosis, especially since other causes of cardiopulmonary disease were excluded. Azathioprine-induced pulmonary disease has also been described[20], nevertheless, it is by far less frequent and in this case it did not seem to contribute to the patient’s symptoms as he was receiving this medication at same dose for 13 mo prior to admission, throughout his entire hospitalization, and after being discharged. As clinical improvement was documented at the time mesalazine was stopped, we conclude this to be the cause.

Cardiopulmonary toxicity related to mesalazine is extremely infrequent making it difficult for clinicians to recognize and diagnose it in the regular practice. The drug-induced pulmonary and cardiac hypersensitivity should be considered in any IBD patient who develops unexplained lung or cardiac disease while on mesalazine. Early recognition of these ADRs may lead to prompt cessation of the drug, most likely resulting in a complete resolution of the symptoms and radiologic abnormalities.

ACKNOWLEDGMENTS

The authors would like to thank Stacie Griffis, MD and Eleanor Boyce for her help with the translation of the manuscript.

COMMENTS
Case characteristics

A 32-year-old man with ulcerative colitis presented with fever, dyspnea, non-productive cough, and chest pain 14 mo from the initiation of mesalazine treatment.

Clinical diagnosis

Mesalazine-induced eosinophilic pneumonia and pericardial effusion.

Differential diagnosis

Cardiorespiratory involvement as an extra-intestinal manifestation of ulcerative colitis (serositis, sarcoidosis, interstitial lung disease or pulmonary embolism); lung infections; and drug-induced adverse reactions.

Laboratory diagnosis

Microcytic hypochromic anemia, WBC count of 12.6 × 109/L, eosinophilia of 7.8 x 109/L (62.3%), diffusion capacity for carbon monoxide of 66.8%, and a bronchoalveolar lavage that reported an eosinophilia of 72.0%, with CD4 and CD8 counts of 29.0% and 56.0%, respectively (CD4/CD8 ratio: 0.51).

Imaging diagnosis

Computed tomography scan showed the presence of a patchy ground glass opacification, centrilobular pulmonary nodules that extended to both inferior lobes, and a large pericardial effusion of 33.6 mm. An echocardiogram confirmed the presence of a large pericardial effusion without evidence of hemodynamic instability.

Pathological diagnosis

A transbronchial biopsy examination showed the presence of a dense eosinophilic infiltrate throughout the interstitium, alveolar spaces, and capillaries, consistent with eosinophilic pneumonia.

Treatment

Mesalazine was suspended, and therapy with prednisone was initiated. Azathioprine therapy was continued at the same dose, before, during and after hospitalization.

Related reports

Mesalazine-induced pulmonary and cardiac hypersensitivity are extremely infrequent entities, making it difficult for clinicians to recognize them. This diagnosis was supported by the presence of eosinophilia in the peripheral blood, bronchoalveolar lavage, and lung biopsy, the deterioration of our patient after an increment of the mesalazine dose, as well as the improvement of the patient after discontinuation of mesalazine therapy. Nevertheless, elimination of other causes is required prior to establishing mesalazine-induced pulmonary and cardiac hypersensitivity diagnosis.

Experiences and lessons

An early recognition and an extensive diagnostic workup are essential in recognizing mesalazine-induced lung and cardiac hypersensitivity in inflammatory bowel disease patients as drug withdrawal may result in a favorable outcome for the patient.

Peer-review

The authors described an interesting case of a patient with ulcerative colitis who developed lung and cardiac hypersensitivity related to mesalazine therapy. This article highlights the importance of considering drug-induced pulmonary and cardiac hypersensitivity in all inflammatory bowel disease patients who develop unexplained lung or cardiac disease while receiving mesalazine treatment.

Footnotes

P- Reviewer: Blonski W, Day AS, Shi RH, Tonelli F, Wittmann T S- Editor: Ma YJ L- Editor: A E- Editor: Wang CH

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