[Changes in hemodynamics during isometric loading in ischemic heart disease].

Area of Science:

• Cardiovascular Physiology
• Clinical Cardiology
• Exercise Physiology

Context:

• Investigating the cardiovascular response to isometric exercise in patients with coronary heart disease (CHD).
• Assessing myocardial contractility and hemodynamics in a cohort of 38 men diagnosed with CHD.
• Utilizing maximal leg isometric load as a diagnostic tool.

Purpose:

• To determine the hemodynamic and myocardial contractility responses to isometric exercise in men with CHD.
• To compare the systemic response in CHD patients versus healthy subjects.
• To evaluate the utility of leg isometric load for early detection of myocardial dysfunction in CHD.

Summary:

• In men with CHD, maximal leg isometric load primarily increases total peripheral resistance, unlike in healthy individuals who show increased myocardial contractility and stroke volume.
• The observed hemodynamic changes in CHD patients correlate with their exercise tolerance, as measured by bicycle ergometry.
• Leg isometric load is proposed as a practical method for assessing myocardial contractility and identifying early-stage disorders in CHD patients, including those in functional class I.

Impact:

• Highlights a distinct cardiovascular response pattern in CHD patients during isometric exertion.
• Establishes leg isometric load as a valuable, accessible tool for early diagnosis of myocardial contractility issues in coronary heart disease.
• Provides insights into the relationship between isometric exercise response, exercise tolerance, and disease severity in CHD.