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[Neurohormonal profile in aortic valve stenosis]
J F Ramirez-Gil1, G Drobinski, A Carayon
1Service de cardiologie, CHU Pitié-Salpêtrière, Paris.
Archives Des Maladies Du Coeur Et Des Vaisseaux
|July 1, 1993
Summary
Sympathetic and hormonal regulation in aortic stenosis show elevated catecholamines in severe cases. Angiotensin converting enzyme inhibitors did not normalize these levels, suggesting complex regulatory mechanisms in this condition.
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Context:
- Valvular aortic stenosis presents a unique model for studying the interplay between arterial pressure and left ventricular function.
- The study included 14 patients with pure calcific aortic stenosis, aged 70±9 years, in sinus rhythm, and without other significant cardiovascular conditions.
- Five patients were receiving angiotensin-converting enzyme (ACE) inhibitors, while none were on diuretic therapy.
Purpose:
- To investigate the sympathetic and hormonal regulatory system responses in patients with valvular aortic stenosis.
- To correlate these responses with the severity of aortic stenosis, left ventricular workload relative to myocardial mass, and the use of ACE inhibitors.
Summary:
- Plasma concentrations of catecholamines, endothelin-1, atrial natriuretic factor (ANF), arginine vasopressin (AVP), plasma renin activity (PRA), angiotensin II, and aldosterone were measured.
- Significantly higher catecholamine levels (noradrenaline) were observed in patients with severe aortic stenosis (valve area < 0.7 cm²).
- Aldosterone levels were elevated in untreated patients, while ANF increased with decreased left ventricular work relative to myocardial mass, potentially linked to hypertrophy.
Impact:
- Findings highlight the significant activation of the sympathetic nervous system in severe aortic stenosis.
- The study suggests that ACE inhibitors may not fully normalize sympathetic overactivity in this patient group.
- Results provide insights into the complex hormonal and sympathetic dysregulation associated with valvular aortic stenosis and left ventricular hypertrophy.