Intramyocardial Pressure Revisited
It is reasoned that intramyocardial pressure (IMP) and ventricular pressure result from the varying stiffness of the cardiac muscle. This varying elastance concept, well known for the ventricular lumen, should also be applied to interstitial spaces. Since pressure depends on the momentary value of the time-varying elastance and the momentary volume (ventricular lumen and interstitial volume, respectively), ventricular and IMP ventricular pressure are not necessarily related. Therefore, IMP should not be viewed as the result of pressure in the ventricular lumen but as a direct result of cardiac muscle contraction.
KeywordsVentricular Pressure Left Ventricular Pressure Cardiac Muscle Contraction Interstitial Volume Isobaric Condition
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- 4.Johnson JR, DiPalma JR: Intramyocardial pressure and its relation to aortic blood pressure. Am J Physiol 1939;125:234–243.Google Scholar
- 7.Gregg DE, Eckstein RW: Measurements of intramyocardial pressure. Am J Physiol 1941;132:781–790.Google Scholar
- 9.Baird RJ, Manktelow RT, Shah PA, Ameli FM: Intramyocardial pressure. The persistence of its transmural gradient in the empty heart and its relationship to myocardial oxygen consumption. J Thoracic and Cardiovasc Surg 1972;64:635–646.Google Scholar
- 10.Laszt L, Mueller A: Der Myokardiale Druck. Helv Physiol Acta 1958; 16:88–106.Google Scholar