Experimental Evidence of Ventricular Diastolic Suction
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چکیده
Intraventricular pressures were measured during brief periods of mitral orifice occlusion to determine whether or not the ventricle am exert a sucking force during diastole. This procedure was based on the premise that with a wide open mitral orifice negative diastolic transmural pressures cannot be detected in the ventricle because the adjoining atrium has collapsible walls. During mitral orifice closure, negative intraventricular pressures were recorded, and Ringer's solution was sucked against the force of gravity into the ventricle. It is concluded that the mammalian ventricle is capable of sucking blood from the atrium into its cavity.
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Commentary on Viewpoint: Is left ventricular volume during diastasis the real equilibrium volume, and what is its relationship to diastolic suction?
TO THE EDITOR: I read with interest the Viewpoint article by Zhang et al. (5). The authors advocated dPLV (ventricular pressure)/dVLV (ventricular volume) 0 as the necessary and sufficient condition for definition of diastolic suction. This definition guarantees that suction manifests only when ESV (end-systolic volume) Veq [equilibrium volume (diastasis volume)] and naturally leads to the kine...
متن کاملCritical review of recent work on ventricular diastolic suction.
Unequivocal evidence in favor of the concept that a ventricular diastolic vis a fronte contributes to ventricular filling has been established only in the following conditions: a. When the ventricle contains an abnormnlly small residual volume (rat, dog, turtle) ; b. When the ventricle contains a more nearly normal, residual volume due to ejection against the resistance of a fluid column (dog, ...
متن کاملExperimental evidence of ventricular diastolic suction.
Intraventricular pressures were measured during brief periods of mitral orifice occlusion to determine whether or not the ventricle am exert a sucking force during diastole. This procedure was based on the premise that with a wide open mitral orifice negative diastolic transmural pressures cannot be detected in the ventricle because the adjoining atrium has collapsible walls. During mitral orif...
متن کاملCommentary on Viewpoint: Is left ventricular volume during diastasis the real equilibrium volume, and what is the relationship to diastolic suction?
TO THE EDITOR: Zhang et al. (6) elegantly discuss the concept of diastasis (static equilibrium volume) and diastolic suction and address the idea that diastasis provides a measure of ventricular equilibrium. While this definition provides a very useful working model, one must also consider differences between early diastolic filling and diastolic suction when examining ventricular function. Ina...
متن کاملIs left ventricular volume during diastasis the real equilibrium volume, and what is its relationship to diastolic suction?
Recent articles (31, 32) illustrate the challenge in providing a self consistent definition of ventricular suction. Conceptually different definitions are treated equivalently despite the fact that they lead to disparate conclusions. We discuss various definitions of suction, their physiological implications, and propose a unifying concept based on an in vivo definition that requires a new pers...
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