Key result
Coronary artery bypass graft surgery caused a significant transient increase in circulating endothelin levels (p=0.0005) that returned to baseline within two hours.
Why the study?
How do circulating endothelin and ANP levels change during CABG surgery in patients with coronary artery disease?
Observational (n=8)
No
How do circulating endothelin and ANP levels change during CABG surgery in patients with coronary artery disease?
p-value: p=0.0005
CABG surgery causes a transient increase in circulating endothelin and a sustained increase in ANP levels, potentially related to endothelial injury, myocardial ischemia, or hypothermia.
Transient endothelin rise during CABG may signal endothelial stress but should not change practice; leaves open mechanistic and outcome links for prospective study.
To evaluate the behavior of circulating endothelin and atrial natriuretic peptide (ANP) during coronary artery bypass graft (CABG) surgery, blood samples from patients with coronary artery disease (n = 8) were investigated before, during and after operation. Plasma levels of endothelin and ANP were determined using the radioimmunoassay method. Baseline plasma levels were compared to those of normal volunteers (n = 6). Left ventricular function at rest and as a response to isometric exercise was evaluated using radionuclide ventriculography before and after coronary bypass surgery. The mean endothelin value was found to be within normal limits, however the mean ANP value was slightly higher than control. Patients had significantly improved left ventricular systolic and diastolic function after surgery. The mean endothelin level was higher than initial values immediately after extra-corporeal circulation and returned to initial values in two hours. However, ANP values were increased and remained higher than initial values. Baseline endothelin values were negatively correlated with systolic function parameters, whereas endothelin and heart rate had a positive correlation before extra-corporeal circulation. Coronary artery bypass graft surgery may cause an increase in the circulating endothelin level either due to endothelial injury or due to myocardial ischemia and hypothermia. Following surgery, increased endothelin levels returned to normal values immediately.
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Paşaoğlu et al. (1993) conducted an observational in Coronary artery disease (n=8). Coronary artery bypass graft (CABG) surgery vs. Baseline (pre-operation) was evaluated on Change in circulating endothelin level during CABG (p=0.0005). Coronary artery bypass graft surgery caused a significant transient increase in circulating endothelin levels (p=0.0005) that returned to baseline within two hours.
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