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MEHMET KAYRAK, M.D., is Consultant; MEHMET YAZICI, M.D., is Consultant and Assistant Professor of Medicine; SELIM S. AYHAN, M.D., is Research Fellow; FATIH KOC, M.D., is Research Fellow; and MEHMET S. ULGEN, M.D., is Consultant and Professor of Medicine, Department of Cardiology, Selcuk University Medical Faculty, Konya, Turkey.

Address correspondence to Dr. Kayrak at the Department of Cardiology, Selcuk University Medical Faculty, Konya, Turkey 42090 (mehmetkayrak{at}yahoo.com).

Purpose. A case of complete atrioventricular block associated with rivastigmine use is presented. Summary. A 67-year-old Turkish woman with Alzheimer’s disease was admitted to the hospital because of dizziness and syncope. Her medical history included diagnoses of hypertension (treated with amlodipine 5 mg daily) and diabetes mellitus (treated with nateglinide 120 mg daily). She had been taking both drugs for over five years. She had also been taking rivastigmine 6 mg p.o. daily for five months for the treatment of Alzheimer’s disease. She had experienced dizziness since the onset of rivastigmine therapy but had not reported it to any health care provider. On admission, she had a blood pressure measurement of 90/60 mm Hg and a pulse rate of 34 beats/min. A 12-lead electrocardiogram revealed complete atrioventricular block. Echocardiography results, blood electrolyte levels, and cardiac biochemical markers were normal. After initial evaluation, a temporary transvenous pacemaker was implanted via the right femoral vein. Amlodipine and rivastigmine were discontinued. On the first day of hospitalization, a coronary angiogram revealed normal coronary anatomy. Two days later, the complete atrioventricular block resolved spontaneously to sinus rhythm. Rivastigmine 6 mg p.o. daily was reinitiated, and complete atrioventricular block recurred on the fourth day of therapy. A VVI permanent pacemaker was implanted on the fifth day of hospitalization. Amlodipine and rivastigmine were reinitiated. The patient continued rivastigmine 6 mg p.o. daily after permanent pacemaker implantation. A three-month follow-up appointment revealed that no further syncope episodes or dizziness had occurred. Conclusion. A 67-year-old woman developed complete atrioventricular block after receiving rivastigmine for the treatment of Alzheimer’s disease. Index terms: Alzheimer disease; Amlodipine; Atrioventricular block; Drugs, adverse reactions; Geriatrics; Nateglinide; Pacemakers; Parasympathomimetic agents; Rivastigmine