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[Sinoatrial node in primary mitral valve prolapse (electrophysiological study)].
R Gil1, Z Kornacewicz-Jach, J Kaźmierczak
1Kliniki Kardiologii PAM, Szczecinie.
Kardiologia Polska
|January 1, 1990
Summary
Sinoatrial node dysfunction is common in patients with mitral valve prolapse (MVP). Electrophysiological studies with pharmacological denervation can reveal concealed sinoatrial node dysfunction, differentiating between functional and organic causes.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Background:
- Mitral valve prolapse (MVP) is a common cardiac condition.
- Sinoatrial node (SN) dysfunction can affect heart rhythm.
- The prevalence and characteristics of SN dysfunction in MVP patients require further investigation.
Purpose of the Study:
- To assess sinoatrial node function in patients with MVP.
- To compare SN function between MVP patients and healthy controls.
- To evaluate the utility of electrophysiological studies with pharmacological denervation in diagnosing SN dysfunction.
Main Methods:
- Electrophysiological study including sinoatrial node recovery time (SNRT), corrected SNRT (CSNRT), and sinus node recovery period (SP).
- Pharmacological denervation using propranolol and atropine.
- Comparison of SN function parameters between 40 MVP patients and 20 controls.
Main Results:
- Sinoatrial node dysfunction was detected in 37.5% of MVP patients via Holter monitoring.
- Electrophysiological studies diagnosed SN dysfunction in 32.5% of MVP patients.
- Pharmacological denervation identified 4 cases of concealed SN dysfunction, clarifying the nature of abnormalities in 7 patients.
Conclusions:
- Sinoatrial node dysfunction is frequently observed in patients with mitral valve prolapse.
- Electrophysiological assessment combined with pharmacological denervation is valuable for detecting concealed SN dysfunction.
- This approach helps differentiate between functional and organic causes of SN dysfunction in MVP patients.