Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Inappropriate sinus tachycardia overview
Introduction
Overview
Overview
Inappropriate sinus tachycardia is an uncommon form of supraventricular tachycardia (SVT).
Epidemiology and Demographics
Epidemiology and Demographics
The condition was first formally recognized as a veritable syndrome in 1979.
Pathophysiology
Pathophysiology
The mechanism of the arrhythmia primarily involves the sinus node and peri-nodal tissue[1] and does not require the AV node for maintenance. These patients have no apparent heart disease or other causes of sinus tachycardia. IST is thought to be due to abnormal autonomic control or dysautonomia. An autoimmune mechanism has been suggested as several studies have detected autoantibodies that activate beta adrenoreceptors in a portion of patients.[2][3]
References
References
- ↑ Sato, Toshiaki; Mitamura, Hideo; Murata, Mitsushige; Shinagawa, Kaori; Miyoshi, Shunichiro; Kanki, Hideaki; Takatsuki, Seiji; Soejima, Kyoko; Miyazaki, Toshihisa (2000). “Electrophysiologic findings of a patient with inappropriate sinus tachycardia cured by selective radiofrequency catheter ablation”. Journal of Electrocardiology. 33 (4): 381–6. doi:10.1054/jelc.2000.9648. PMID 11099363.
- ↑ Chiale, Pablo A.; Garro, Hugo A.; Schmidberg, Jorge; Sánchez, Rubén A.; Acunzo, Rafael S.; Lago, Manuel; Levy, Gabriela; Levin, Mariano (2006). “Inappropriate sinus tachycardia may be related to an immunologic disorder involving cardiac β andrenergic receptors”. Heart Rhythm. 3 (10): 1182–6. doi:10.1016/j.hrthm.2006.06.011. PMID 17018348.
- ↑ Nattel, Stanley (2006). “Inappropriate sinus tachycardia and beta-receptor autoantibodies: A mechanistic breakthrough?”. Heart Rhythm. 3 (10): 1187–8. doi:10.1016/j.hrthm.2006.07.019. PMID 17018349.
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]