Hyperthyroidism and severe bradycardia: Report of three cases and review of the literature

Table 2 Clinical presentation of 34 cases of hyperthyroidism and severe bradycardia

Number	Symptoms of bradycardia	Sequence of occurrence of hyperthyroidism and bradycardia	Use of anti-arrhythmic drugs before onset of bradycardia	Accompanying conditions
1	-	Hyperthyroidism first	-	-
2	Syncope	Hyperthyroidism first	Propranolol	-
3	Syncope	Hyperthyroidism first	Digoxin and propranolol	-
4	Syncope	Hyperthyroidism first	-	-
5	-	-	-	Fever
6	-	-	-	Fever
7	Syncope	Hyperthyroidism first	-	-
8	Presyncope	Simultaneous	-	-
9	Syncope	Hyperthyroidism first	Propranolol	-
10	-	Bradycardia first	-	-
11	Near syncope	Bradycardia first	Carvedilol	-
12	Syncope	Bradycardia first	-	-
13	-	Simultaneous	-	Jaundice and febrile, creatinine 250 μmol/L
14	Syncope	Hyperthyroidism first	-	-
15	Syncope	Hyperthyroidism first	-	-
16	Syncope	Hyperthyroidism first	-	-
17	Syncope	Simultaneous	-	-
18	-	Simultaneous	-	-
19	-	Hyperthyroidism first	-	-
20	Dizziness	Hyperthyroidism first	Atenolol	-
21	Syncope	Bradycardia first	-	-
22	Syncope	Hyperthyroidism first	-	-
23	-	Simultaneous	-	Periodic paralysis
24	Syncope	Hyperthyroidism first	-	-
25	Syncope	Hyperthyroidism first	Propranolol, diltiazem	-
26	Fatigue	Bradycardia first	-	-
27	-	Simultaneous	-	-
28	Syncope	Simultaneous	-	Blood potassium 2.3 mmol/L
29	Palpitation	Hyperthyroidism first	Metoprolol	-
30	-	Simultaneous	-	-
31	-	Hyperthyroidism first	-	-
32	Syncope	Hyperthyroidism first	Cedilanide	-
33	Syncope	Hyperthyroidism first	-	-
34	Syncope	Simultaneous	-	-

-: No or information not available.