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[Myocardial ischemia in aortic stenosis]
S Trevethan1, L Manero Sastré, E Morales
1Instituto Nacional de Cardiología, Ignacio Chávez, México.
Archivos Del Instituto De Cardiologia De Mexico
|January 1, 1989
Summary
Myocardial ischemia in hypertensive heart disease is primarily caused by an inappropriate increase in myocardial mass, not coronary artery resistance. This finding is crucial for understanding heart disease progression and treatment strategies.
Area of Science:
- Cardiology
- Pathophysiology
Context:
- Hypertensive heart disease (HHD) often involves myocardial ischemia.
- Previous theories proposed inadequate myocardial mass increment or increased coronary resistance as causes.
- Aortic stenosis (AS) provides a model to study HHD without coronary artery disease.
Purpose:
- To investigate the relationship between myocardial mass, left ventricular filling pressures, and coronary artery resistance in the development of myocardial ischemia in patients with AS.
Summary:
- Eighteen patients with AS (no coronary artery disease) underwent atrial pacing to induce myocardial ischemia, monitored via ST segment depression.
- Myocardial ischemia showed a direct association with increased myocardial mass.
- No significant relation was found between ischemia and left ventricular telediastolic pressure or transvalvular gradient.
Impact:
- Results support the hypothesis that disproportionate myocardial hypertrophy is the primary driver of ischemia in AS-related HHD.
- This clarifies the pathophysiology of myocardial ischemia in specific cardiac conditions.
- Informs potential therapeutic targets for preventing or treating ischemia in HHD.