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Potential protective effect of high coronary wedge pressure on left ventricular function after coronary occlusion
B de Bruyne1, B Meier, L Finci
1Cardiology Center, University Hospital, Geneva, Switzerland.
Insights
High coronary wedge pressure indicates better heart muscle protection after coronary artery occlusion. This pressure measurement is a more reliable indicator of collateral function than visual assessment of coronary collaterals.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Coronary collateral circulation plays a vital role in myocardial protection following coronary artery occlusion.
- Assessing the functional significance of these collaterals is crucial for understanding post-occlusion cardiac outcomes.
Purpose of the Study:
- To evaluate the protective potential of coronary collateral circulation in patients with occluded coronary arteries.
- To compare the predictive value of coronary wedge pressure versus angiographic collateral grading for left ventricular function.
Main Methods:
- Studied 47 patients with recanalized totally occluded coronary arteries.
- Measured mean coronary wedge pressure and assessed left ventricular function (global ejection fraction and regional function).
- Coronary wedge pressure was measured at a mean of 39 days post-occlusion.
Main Results:
- Patients with coronary wedge pressure >30 mm Hg showed significantly better global and regional left ventricular function compared to those with pressure ≤30 mm Hg.
- Global left ventricular function strongly correlated with coronary wedge pressure (r=0.51, p<0.001).
- No significant correlation was found between left ventricular function and the angiographic presence of collaterals.
Conclusions:
- Elevated coronary wedge pressure is associated with preserved left ventricular function after coronary artery occlusion.
- Coronary wedge pressure is a more accurate reflection of the physiological role of collaterals than their angiographic appearance.
- This finding highlights the importance of functional assessment over morphological assessment of coronary collaterals.
Abstract:
To assess the potential of coronary collateral circulation to protect myocardium after occlusion of a coronary vessel, the mean coronary wedge pressure, the angiographic grade of collateral channels, and the left ventricular function were studied in 47 consecutive patients with mechanical recanalization of totally occluded coronary arteries. Coronary wedge pressure measurements were obtained 39 +/- 51 days (range, 2 hours to 361 days) after the presumed time of occlusion. The patients were divided into two groups: 31 with a coronary wedge pressure more than 30 mm Hg (group 1) and 16 with a coronary wedge pressure of or less than 30 mm Hg (group 2). Patients in group 1 had a significantly higher mean global left ventricular ejection fraction than those in group 2 (63 +/- 9% vs. 49 +/- 7%, p less than 0.001). Regional left ventricular function (artery-related area change) was also superior in group 1 compared with group 2 (47 +/- 11% vs. 36 +/- 10%, p less than 0.01). Global left ventricular function was significantly correlated to coronary wedge pressure (r = 0.51, p less than 0.001) but not to the angiographic presence of collaterals. The data suggest that a high coronary wedge pressure is associated with improved left ventricular function after coronary artery occlusion and that coronary wedge pressure more accurately reflects the physiological role of collaterals than their angiographic presence.