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[Functional status of the left side of the heart in patients with ischemic heart disease during isometric exercise]
Insights
Isometric leg exercise reveals left-atrial and left-ventricular pumping and contractility disorders in coronary patients. This stress test helps detect hemodynamic abnormalities in individuals with postinfarction cardiosclerosis.
Area of Science:
- Cardiology
- Physiology
- Exercise Science
Context:
- Assessing hemodynamic function in patients with postinfarction cardiosclerosis is crucial for understanding cardiac reserve.
- Isometric leg exercise is a non-invasive method to evaluate cardiovascular responses under stress.
Purpose:
- To investigate the hemodynamic responses of left-ventricular and left-atrial contractility and pumping function during isometric leg exercise in males with postinfarction cardiosclerosis compared to healthy controls.
- To determine if isometric leg exercise can detect subclinical cardiac dysfunction in coronary patients.
Summary:
- Hemodynamic parameters were assessed in 47 males with postinfarction cardiosclerosis and 30 healthy males during maximal isometric leg exercise.
- Normal subjects exhibited increased left-ventricular contractility and the Frank-Starling mechanism, extending to the left atrium.
- Coronary patients showed initial increases in left-atrial reservoir function, followed by activation of transport and pumping functions, indicating distinct responses to stress.
Impact:
- Isometric leg exercise effectively identifies left-atrial and left-ventricular pumping and contractility disorders in coronary patients.
- This method can aid in the early detection of hemodynamic impairments in individuals with postinfarction cardiosclerosis, even without clinical signs of circulatory insufficiency.
Abstract:
Hemodynamic parameters of left-ventricular and left-atrial contractility and pumping function were examined in 47 males with postinfarction cardiosclerosis and no clinical signs of circulatory insufficiency and in 30 normal male subjects, exposed to isometric leg exercise with the highest possible compression force. At the height of exercise, normal subjects showed increased left-ventricular myocardial contractility along with the initiation of the Frank-Starling mechanism, spreading to the left atrium as well, while coronary patients responded to increased stress by growing left-atrial reservoir function during the first minutes of exercise, and activated left-atrial transport and pumping functions afterwards. Isometric leg exercise is capable of detecting left-atrial and left-ventricular pumping and contractility disorders in coronary patients.