Key result
Coronary artery bypass surgery immediately worsened left ventricular diastolic function, decreasing mean end-diastolic area at a comparable preload from 17.6 to 14.9 cm2 (p=0.0001).
Why the study?
Does coronary artery bypass surgery increase left ventricular diastolic chamber stiffness immediately postoperatively?
Observational (n=20)
Does coronary artery bypass surgery increase left ventricular diastolic chamber stiffness immediately postoperatively?
Effect estimate: 15% decrease
Absolute Event Rate: 14.9% vs 17.6%
p-value: p=0.0001
Left ventricular diastolic chamber stiffness significantly increases immediately after coronary artery bypass surgery, which can be effectively evaluated using simultaneous TEE and hemodynamic monitoring.
May complicate perioperative fluid management; leaves open long-term clinical relevance in larger cohorts.
OBJECTIVES: The aim of this study was to assess the incidence and severity of left ventricular diastolic dysfunction immediately after coronary artery bypass surgery by utilizing simultaneous transesophageal echocardiographic and hemodynamic monitoring. BACKGROUND: Left ventricular diastolic dysfunction has been documented after coronary bypass surgery, but its measurement has been technically difficult to acquire and limited by dependence on loading conditions. METHODS: End-diastolic pressure-area curves were constructed before and immediately after coronary bypass surgery in 20 patients. Transesophageal echocardiographic images at the midpapillary level of the left ventricle and hemodynamic data were recorded. Volume status was manipulated to alter loading conditions, and multiple measurements were taken at each loading condition. RESULTS: Diastolic function worsened in all patients, as manifested by a postoperative leftward shift of the end-diastolic pressure-area curve. At a comparable preload, mean end-diastolic area +/- SEM decreased by 15% from 17.6 +/- 0.8 to 14.9 +/- 0.8 cm2 postoperatively (p = 0.0001). CONCLUSIONS: Left ventricular diastolic chamber stiffness frequently increases immediately after coronary artery bypass surgery. Simultaneous hemodynamic and transesophageal echocardiographic monitoring, through the construction of end-diastolic pressure-area curves, is a useful method to evaluate diastolic function and guide management after cardiac surgery.
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McKenney et al. (1994) conducted an observational in Coronary artery disease requiring bypass surgery (n=20). Coronary artery bypass surgery vs. Preoperative baseline was evaluated on Mean end-diastolic area at a comparable preload (15% decrease, p=0.0001). Coronary artery bypass surgery immediately worsened left ventricular diastolic function, decreasing mean end-diastolic area at a comparable preload from 17.6 to 14.9 cm2 (p=0.0001).
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