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Blood volume after coronary artery bypass grafting
T Ivert1, S K Pehrsson, C Landou
1Division of Cardiology, Karolinska Hospital, Stockholm, Sweden.
Insights
Stable angina patients, even after bypass surgery, show significantly reduced blood volume (BV). This persistent low BV was not linked to improved health outcomes, suggesting a regulatory issue.
Area of Science:
- Cardiology
- Vascular Physiology
Background:
- Patients with stable angina pectoris often exhibit reduced blood volume (BV).
- The long-term impact of coronary artery bypass grafting (CABG) on BV in these patients is not fully understood.
Purpose of the Study:
- To investigate blood volume (BV) levels in men 5 years after coronary artery bypass grafting (CABG).
- To determine if improved clinical outcomes after CABG correlate with normalized BV.
Main Methods:
- Assessed blood volume (BV) in 77 men 5 years post-CABG.
- Correlated BV with clinical factors: angina relief, medication use, revascularization status, physical fitness, body weight, heart volume, exercise capacity, ejection fraction, and left ventricular end-diastolic pressure.
Main Results:
- Average BV was 19% lower than predicted 5 years after CABG.
- No correlation found between BV and improved angina, medication status, revascularization, or fitness.
- BV showed no significant correlation with body weight, heart volume, exercise capacity, ejection fraction, or LVEDP.
Conclusions:
- Reduced blood volume (BV) persists in patients with stable angina even after successful CABG.
- The lack of correlation between BV and physiological variables suggests a persistent regulatory disturbance.
Abstract:
Patients with stable angina pectoris are reported to have a markedly reduced blood volume (BV). In the present study, average BV was still 19% less than that predicted in 77 men examined 5 years after coronary artery bypass grafting. Beneficial effects of the operation such as relieved angina, absence of medication, complete revascularization status at repeat angiography, and restored physical fitness were not found to be associated with a normalization of the BV. No significant correlation was found between BV and body weight, heart volume, exercise capacity, ejection fraction or left ventricular end-diastolic pressure. The reduced BV in patients with angina pectoris after successful revascularization and the absence of correlation with physiological variables indicate a persisting disturbed regulation mechanism.