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Experimental instrumentation and left ventricular pressure-strain relationship
N W Scott-Douglas1, M Traboulsi, E R Smith
1Department of Medicine, University of Calgary, Alberta, Canada.
The American Journal of Physiology
|December 1, 1991
Summary
Measuring pericardial pressure by opening the pericardium does not significantly alter the left ventricular end-diastolic pressure-strain relationship (LVEDPSR). Instrumentation and pericardial closure did not affect cardiac function measurements.
Area of Science:
- Cardiovascular Physiology
- Surgical Instrumentation
- Cardiac Mechanics
Background:
- Pericardial pressure measurement often involves opening and closing the pericardium.
- This procedure may alter cardiac function by constraining the heart.
- Accurate measurement of the left ventricular end-diastolic pressure-strain relationship (LVEDPSR) is crucial.
Purpose of the Study:
- To investigate the impact of pericardial opening, instrumentation, and reapproximation on LVEDPSR.
- To determine if surgical manipulation affects cardiac pressure-volume dynamics.
Main Methods:
- Utilized open-chest dogs for the study.
- Inserted sonomicrometer crystals and a pericardial balloon transducer.
- Measured left ventricular (LV) pressure and segment length.
- Recorded LVEDPSRs before pericardial opening, after instrumentation and reapproximation, and after pericardial removal.
Main Results:
- LVEDPSRs obtained after instrumentation and pericardial reapproximation were comparable to baseline measurements.
- Data collected post-instrumentation consistently fell within the confidence intervals of pre-instrumentation data.
- Pericardial opening and closure did not significantly alter the LVEDPSR.
Conclusions:
- Opening, instrumenting, and reapproximating the pericardium does not compromise the accuracy of LVEDPSR measurements.
- The methodology used is reliable for studying cardiac mechanics under these conditions.