Autonomic and antiarrhythmic drug modulation of ST segment elevation in patients with Brugada syndrome

We examined the modulatory effects of autonomic nervous system and antiarrhythmic drugs on the ST segment in patients with Brugada syndrome to gain an insight into the mechanism of ST segment elevation. Right bundle branch block, ST segment elevation and ventricular tachyarrhythmias define a distinc...

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Veröffentlicht in:Journal of the American College of Cardiology 1996-04, Vol.27 (5), p.1061-1070
Hauptverfasser: Miyazaki, Toshihisa, Mitamura, Hideo, Miyoshi, Shunichiro, Soejima, Kyoko, Aizawa, Yoshifusa, Ogawa, Satoshi
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container_end_page 1070
container_issue 5
container_start_page 1061
container_title Journal of the American College of Cardiology
container_volume 27
creator Miyazaki, Toshihisa
Mitamura, Hideo
Miyoshi, Shunichiro
Soejima, Kyoko
Aizawa, Yoshifusa
Ogawa, Satoshi
description We examined the modulatory effects of autonomic nervous system and antiarrhythmic drugs on the ST segment in patients with Brugada syndrome to gain an insight into the mechanism of ST segment elevation. Right bundle branch block, ST segment elevation and ventricular tachyarrhythmias define a distinct clinical and electrocardiographic (ECG) syndrome (Brugada syndrome). However, the mechanism of ST segment elevation and the causes of this syndrome are unknown. The study included four patients in whom structural heart or coronary artery disease was excluded by noninvasive and invasive tests. High take-off ST segment elevation of either the coved or saddle-back type in precordial leads V1, V2and V3was seen in all patients. Three patients experienced recurrent episodes of syncope or aborted sudden cardiac death, and the remaining patient had palpitation. Autonomic receptor stimulation and blockade and intravenous administration of antiarrhythmic drugs were performed during sinus rhythm while the 12-lead ECG was recorded. Metaiodobenzylguanidine (MIBG) scanning and Holter monitoring were also performed. Beta-adrenoceptor stimulation by intravenous isoproterenol consistently reduced (≥0.1 mV) ST segment elevation at or 80 ms after the J point in all four patients. Selective alphaadrenoceptor stimulation by intravenous norepinephrine in the presence of propranolol or by intravenous methoxamine consistently augmented, whereas alpha-adrenoceptor blockade reduced, ST segment elevation in three patients. Intracoronary acetylcholine or intravenous edrophonium or neostigmine augmented ST segment elevation without inducing coronary spasm in three of four patients. Class IA antiarrhythmic drugs also consistently augmented (three patients), whereas class IB drugs had no effect on (two patients) ST segment elevation. No abnormality was found on MIBG imaging or heart rate variability in three patients, suggesting that autonomic dysfunction is not a primary disease process. Class IA drugs had no effect on ST segment in three control patients, suggesting that the ST segment elevation seen in patients with Brugada syndrome in response to the drugs is not a nonspecific response. ST segment elevation in patients with Brugada syndrome was augmented by selective stimulation of alphaadrenoceptors or muscarinic receptors or by class IA drugs but was mitigated by beta-adrenoceptor stimulation or alphaadrenoceptor blockade. These responses might be explained by postulating the presence
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Right bundle branch block, ST segment elevation and ventricular tachyarrhythmias define a distinct clinical and electrocardiographic (ECG) syndrome (Brugada syndrome). However, the mechanism of ST segment elevation and the causes of this syndrome are unknown. The study included four patients in whom structural heart or coronary artery disease was excluded by noninvasive and invasive tests. High take-off ST segment elevation of either the coved or saddle-back type in precordial leads V1, V2and V3was seen in all patients. Three patients experienced recurrent episodes of syncope or aborted sudden cardiac death, and the remaining patient had palpitation. Autonomic receptor stimulation and blockade and intravenous administration of antiarrhythmic drugs were performed during sinus rhythm while the 12-lead ECG was recorded. Metaiodobenzylguanidine (MIBG) scanning and Holter monitoring were also performed. Beta-adrenoceptor stimulation by intravenous isoproterenol consistently reduced (≥0.1 mV) ST segment elevation at or 80 ms after the J point in all four patients. Selective alphaadrenoceptor stimulation by intravenous norepinephrine in the presence of propranolol or by intravenous methoxamine consistently augmented, whereas alpha-adrenoceptor blockade reduced, ST segment elevation in three patients. Intracoronary acetylcholine or intravenous edrophonium or neostigmine augmented ST segment elevation without inducing coronary spasm in three of four patients. Class IA antiarrhythmic drugs also consistently augmented (three patients), whereas class IB drugs had no effect on (two patients) ST segment elevation. No abnormality was found on MIBG imaging or heart rate variability in three patients, suggesting that autonomic dysfunction is not a primary disease process. Class IA drugs had no effect on ST segment in three control patients, suggesting that the ST segment elevation seen in patients with Brugada syndrome in response to the drugs is not a nonspecific response. ST segment elevation in patients with Brugada syndrome was augmented by selective stimulation of alphaadrenoceptors or muscarinic receptors or by class IA drugs but was mitigated by beta-adrenoceptor stimulation or alphaadrenoceptor blockade. These responses might be explained by postulating the presence of an area of early repolarization or a local “depolarized” area in the ventricle causing ST segment elevation in this syndrome. 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Right bundle branch block, ST segment elevation and ventricular tachyarrhythmias define a distinct clinical and electrocardiographic (ECG) syndrome (Brugada syndrome). However, the mechanism of ST segment elevation and the causes of this syndrome are unknown. The study included four patients in whom structural heart or coronary artery disease was excluded by noninvasive and invasive tests. High take-off ST segment elevation of either the coved or saddle-back type in precordial leads V1, V2and V3was seen in all patients. Three patients experienced recurrent episodes of syncope or aborted sudden cardiac death, and the remaining patient had palpitation. Autonomic receptor stimulation and blockade and intravenous administration of antiarrhythmic drugs were performed during sinus rhythm while the 12-lead ECG was recorded. Metaiodobenzylguanidine (MIBG) scanning and Holter monitoring were also performed. Beta-adrenoceptor stimulation by intravenous isoproterenol consistently reduced (≥0.1 mV) ST segment elevation at or 80 ms after the J point in all four patients. Selective alphaadrenoceptor stimulation by intravenous norepinephrine in the presence of propranolol or by intravenous methoxamine consistently augmented, whereas alpha-adrenoceptor blockade reduced, ST segment elevation in three patients. Intracoronary acetylcholine or intravenous edrophonium or neostigmine augmented ST segment elevation without inducing coronary spasm in three of four patients. Class IA antiarrhythmic drugs also consistently augmented (three patients), whereas class IB drugs had no effect on (two patients) ST segment elevation. No abnormality was found on MIBG imaging or heart rate variability in three patients, suggesting that autonomic dysfunction is not a primary disease process. Class IA drugs had no effect on ST segment in three control patients, suggesting that the ST segment elevation seen in patients with Brugada syndrome in response to the drugs is not a nonspecific response. ST segment elevation in patients with Brugada syndrome was augmented by selective stimulation of alphaadrenoceptors or muscarinic receptors or by class IA drugs but was mitigated by beta-adrenoceptor stimulation or alphaadrenoceptor blockade. These responses might be explained by postulating the presence of an area of early repolarization or a local “depolarized” area in the ventricle causing ST segment elevation in this syndrome. 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Right bundle branch block, ST segment elevation and ventricular tachyarrhythmias define a distinct clinical and electrocardiographic (ECG) syndrome (Brugada syndrome). However, the mechanism of ST segment elevation and the causes of this syndrome are unknown. The study included four patients in whom structural heart or coronary artery disease was excluded by noninvasive and invasive tests. High take-off ST segment elevation of either the coved or saddle-back type in precordial leads V1, V2and V3was seen in all patients. Three patients experienced recurrent episodes of syncope or aborted sudden cardiac death, and the remaining patient had palpitation. Autonomic receptor stimulation and blockade and intravenous administration of antiarrhythmic drugs were performed during sinus rhythm while the 12-lead ECG was recorded. Metaiodobenzylguanidine (MIBG) scanning and Holter monitoring were also performed. Beta-adrenoceptor stimulation by intravenous isoproterenol consistently reduced (≥0.1 mV) ST segment elevation at or 80 ms after the J point in all four patients. Selective alphaadrenoceptor stimulation by intravenous norepinephrine in the presence of propranolol or by intravenous methoxamine consistently augmented, whereas alpha-adrenoceptor blockade reduced, ST segment elevation in three patients. Intracoronary acetylcholine or intravenous edrophonium or neostigmine augmented ST segment elevation without inducing coronary spasm in three of four patients. Class IA antiarrhythmic drugs also consistently augmented (three patients), whereas class IB drugs had no effect on (two patients) ST segment elevation. No abnormality was found on MIBG imaging or heart rate variability in three patients, suggesting that autonomic dysfunction is not a primary disease process. Class IA drugs had no effect on ST segment in three control patients, suggesting that the ST segment elevation seen in patients with Brugada syndrome in response to the drugs is not a nonspecific response. ST segment elevation in patients with Brugada syndrome was augmented by selective stimulation of alphaadrenoceptors or muscarinic receptors or by class IA drugs but was mitigated by beta-adrenoceptor stimulation or alphaadrenoceptor blockade. These responses might be explained by postulating the presence of an area of early repolarization or a local “depolarized” area in the ventricle causing ST segment elevation in this syndrome. Because only a small number of patients were studied, these possibilities need further evaluation.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>8609322</pmid><doi>10.1016/0735-1097(95)00613-3</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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subjects Adult
Anti-Arrhythmia Agents - therapeutic use
Biological and medical sciences
Calcium Channel Blockers - therapeutic use
Cardiac dysrhythmias
Cardiology. Vascular system
Disopyramide - therapeutic use
Electrocardiography
Heart
Humans
Lidocaine - therapeutic use
Male
Medical sciences
Mexiletine - therapeutic use
Middle Aged
Procainamide - therapeutic use
Syndrome
Tachycardia, Ventricular - drug therapy
Tachycardia, Ventricular - physiopathology
Verapamil - therapeutic use
title Autonomic and antiarrhythmic drug modulation of ST segment elevation in patients with Brugada syndrome
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