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[Changes in the subvalvular apparatus and left ventricular function in pure mitral stenosis].
Archives Des Maladies Du Coeur Et Des Vaisseaux
|March 1, 1978
Summary
Patients with mitral stenosis (MS) and sub-valvular changes show impaired left ventricular function. These sub-valvular changes indicate, rather than cause, this dysfunction, which can occur even with normal sub-valvular apparatus.
Area of Science:
- Cardiology
- Cardiac Physiology
Background:
- Isolated mitral stenosis (MS) is often associated with left ventricular (LV) dysfunction.
- The role of sub-valvular apparatus changes in LV dysfunction in MS is not fully understood.
Purpose of the Study:
- To investigate the association between left ventricular function and sub-valvular apparatus changes in patients with isolated mitral stenosis.
- To determine if sub-valvular changes cause or indicate LV dysfunction.
Main Methods:
- Left ventricular cine-angiography was used to categorize patients into two groups: those with (Group II) and without (Group I) sub-valvular apparatus changes.
- Key echocardiographic parameters of LV function were compared between the two groups.
Main Results:
- Group II patients exhibited significantly lower ejection fraction (EF), systolic ejection volume (SEV), speed of shortening of circular fibres (VCF), and systolic work index (SWI) compared to Group I.
- No significant differences were observed in age, heart rate, or left ventricular end-diastolic pressure between the groups.
- Sub-valvular apparatus changes were found to be indicative, not causative, of LV dysfunction.
Conclusions:
- Sub-valvular apparatus changes in mitral stenosis are associated with impaired left ventricular function.
- Left ventricular dysfunction in MS may occur independently of sub-valvular apparatus abnormalities.
- The findings suggest that sub-valvular changes are a marker rather than a cause of LV dysfunction in MS.