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Coronary sinus occlusion pressure and its relation to intracardiac pressure
Insights
Coronary sinus occlusion pressure closely mirrors left ventricular end-diastolic pressure in humans. This finding suggests thebesian vein connections are important and CS occlusion pressure may aid in assessing LV pressure clinically.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Medical Diagnostics
Background:
- Hemodynamic components of coronary sinus (CS) occlusion pressure in humans are not well-described.
- Thebesian vein drainage may influence CS occlusion pressure, potentially reflecting left ventricular (LV) pressure.
- Understanding this relationship is crucial for accurate cardiovascular assessment.
Purpose of the Study:
- To investigate the relationship between CS occlusion pressure and LV pressure in humans.
- To determine if CS occlusion pressure can be used to estimate LV end-diastolic pressure.
- To explore the role of thebesian vessel connections in cardiovascular hemodynamics.
Main Methods:
- Simultaneous recording of LV end-diastolic pressure and end-diastolic CS occlusion pressure in 27 patients.
- Acute CS occlusion using a balloon-tipped catheter during cardiac catheterization.
- Analysis of pressure correlations at rest across a range of pressures.
Main Results:
- End-diastolic CS occlusion pressure (15.9 +/- 5.4 mm Hg) was not significantly different from LV end-diastolic pressure (16.7 +/- 5.6 mm Hg).
- A strong positive correlation (p < 0.001) was observed between end-diastolic CS occlusion pressure and LV end-diastolic pressure.
- Systolic CS occlusion pressure was significantly lower than LV systolic pressure.
Conclusions:
- End-diastolic CS occlusion pressure closely parallels LV end-diastolic pressure in humans.
- Measurement of CS occlusion pressure may offer clinical utility for assessing LV end-diastolic pressure.
- Findings suggest hemodynamically significant thebesian vessel connections exist in humans.
Abstract:
The hemodynamic components of coronary sinus (CS) occlusion pressure in humans have not been well described. If no other outflow for venous blood were present, then after acute occlusion of the coronary sinus the pressure would increase and equal aortic pressure. However, if thebesian vein drainage between the left ventricle and the coronary veins has an important role in humans, then CS occlusion pressure might reflect left ventricular (LV) pressure through transmitted LV pressure or intramyocardial pressure. To study this relation, 27 patients who underwent routine diagnostic cardiac catheterization were evaluated. Occlusion was accomplished by sudden inflation of a No. 7Fr balloon-tipped catheter placed into the CS. LV end-diastolic pressure and end-diastolic CS occlusion pressure were simultaneously recorded at rest. LV end-diastolic pressure (16.7 +/- 5.6 mm Hg) was not significantly different from end-diastolic CS occlusion pressure (15.9 +/- 5.4 mm Hg). LV end-diastolic and end-diastolic CS occlusion pressures were positively correlated (p less than 0.001) over the entire range of pressures (9 to 27 mm Hg). In contrast, systolic CS occlusion pressure was significantly lower than LV systolic pressure and unrelated to right-sided heart pressures. It is concluded that in humans, end-diastolic CS occlusion pressure closely parallels LV end-diastolic pressure, and measurement of CS occlusion pressure to assess LV end-diastolic pressure may have clinical use. These findings also suggest the existence of hemodynamically important thebesian vessel connections that may have implications for retroperfusion or pressure-controlled intermittent CS occlusion in humans.