Key Points
- This research aims to investigate the suction capabilities of the left ventricle using a novel technique without disrupting the mitral valve.
- Studied 17 dogs with open-chest experiments.
- Measured left ventricular pressure (LVP) and left atrial pressure (LAP) while controlling LAP via a servo pump.
- Established a setpoint near 0 mmHg for LAP with normal heart rates and pressures.
- Left ventricle showed mean negative LVP of -2.3 +/- 1.1 mmHg, P < 0.0001.
- Demonstrated that negative diastolic suction pressures can be generated in vivo.
- Confirmed that intact mitral valve does not hinder the heart's ability to aid its own filling.
Structured PICO
PPopulation17 open-chest dogs with normal mitral valves
IInterventionLeft atrial pressure-clamp servomechanism (controlling LAP to a setpoint near 0 mmHg by withdrawing blood from the left atrium)
OOutcomeLeft ventricular suction (negative diastolic suction pressures)surrogate
A novel left atrial pressure-clamp servomechanism demonstrates that the left ventricle can generate negative diastolic suction pressures in vivo with an undisturbed mitral valve.