Atrial transport function in coronary artery disease: relation to left ventricular function.

Area of Science:

• Cardiology
• Physiology

Background:

• The role of atrial contraction in maintaining cardiac output is significant, particularly in conditions affecting ventricular function.
• Coronary artery disease (CAD) can impair left ventricular (LV) function, potentially altering the importance of atrial contribution to stroke volume.

Purpose of the Study:

• To evaluate the atrial contribution to ventricular stroke volume in patients with coronary artery disease.
• To determine the relationship between atrial contribution to stroke volume and left ventricular function in these patients.

Main Methods:

• Fifty patients with coronary artery disease underwent comprehensive hemodynamic and angiographic assessments.
• Angiographic volume studies were used to quantify atrial contribution to stroke volume, end-systolic volume, and ejection fraction.
• Comparisons were made with a control group of 11 healthy individuals.

Main Results:

• Patients with coronary artery disease exhibited a significantly higher atrial contribution to stroke volume (33% +/- 11%) compared to normal subjects (20% +/- 7%).
• Congestive heart failure and cardiomegaly were associated with the highest atrial contribution (46%).
• Atrial contribution showed a strong inverse correlation with left ventricular ejection fraction (r = -0.64) and end-systolic volume (r = 0.56).

Conclusions:

• Atrial contribution to stroke volume is significantly increased in patients with coronary artery disease.
• This increased atrial contribution is inversely related to left ventricular function, highlighting its compensatory role in compromised ventricles.