isovolumic


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i·so·vol·u·mic

(ī'sō-vol-yū'mik),
Occurring without an associated alteration in volume, as when, in early ventricular systole, the muscle fibers initially increase their tension without shortening so that ventricular volume remains unaltered.
See also: isometric.
Synonym(s): isochoric, isovolumetric

isovolumic

/iso·vo·lu·mic/ (i″so-vah-loo´mik) maintaining the same volume.

i·so·vol·u·mic

(ī'sō-vol-yū'mik)
Occurring without an associated alteration in volume, as when, in early ventricular systole, the muscle fibers initially increase their tension without shortening so that ventricular volume remains unaltered.
See also: isometric
References in periodicals archive ?
001 velocity (cm/s) Mitral isovolumic 75 [+ or -] 19 57 [+ or -] 14 <0.
The timing of end-systole (aortic valve closure) and end-diastole (onset of isovolumic contraction) of LV were derived using a myocardial tissue velocity profile.
0004 Pearson correlation analysis and linear regression analysis ABI--ankle brachial index, BMI--body mass index, DT--deceleration time, E-A--mitral E and A velocity, EF--ejection fraction, IVRT-- isovolumic relaxation time, IVS--interventricu-lar septum diameter, LVDD--left ventricular diastolic dimension, LVSD--left ventricular systolic dimension, TAAs--tension arterial of ankle, TABs--tension arterial of brachial
The MPI is defined as the ratio of isovolumic time (IVRT+IVCT) divided by ejection time (ET).
8 23 98 Fs: Fractional Shortening, EF: Ejection Fraction, E/A ratio: Early rapid filling/Atrial contraction in mitral valve blood flow, EDT: early deceleration time, IVRT: Isovolumic Relaxation Time (left ventricle) Table 3: Participants' cardiac function Frequency Percent Systolic function Normal 70 87.
Isovolumic relaxation time and isovolumic contraction time from the basal part of the left ventricle, myocardial rate during the systole, myocardial rate during the erly diastole, the rate during the late diastole, ejection time, isovolumic contraction acceleration and acceleration of the ventricle at the time of isovolumic contraction were measured.
Animals in the control and model groups were treated with isovolumic distilled water instead.
There was a restrictive physiology pattern of the left ventricle, however, with isovolumic relaxation time of 50 milliseconds, deceleration time of 160 milliseconds, and early to late diastolic filling ratio of 2.
70 (X [+ or -] SD) (cm -- Centimeters) (sec-second) A A wave maximal velocity AFF A trial filling fraction E E wave maximal velocity E/A Maximal E/Maximal A wave velocity Frac Short Fractional Shortening IVRT Isovolumic relaxation time IVST-d Interventricular Septal Wall Thickness n Diastole LVID-s Left Ventricular Internal Dimensions n Systole LVID-d Left Ventricular Internal Dimensions n Diastole PWT-d Posterior Wall Thickness n Diastole LV MI Left Ventricular Mass Index (Reference 10, published with permission from the authors, the Am Ger J Cardiol and Le Jacq Communications).
Price (15) and Mandelkern (16) introduced a difference of density between the amorphous and crystalline phases, in order to remove the isovolumic assumption.
8 in individuals >55 years, DT >220 ms, IRT >100 ms; pseudonormal: 1 < E/A < 2,150 ms < DT < 200 ms, IRT <100 ms; restrictive filling, E/A >2, DT <150 ms, IRT <60 ms, where E is the peak E-wave velocity and A is the peak A-wave velocity of the mitral inflow, DT is the deceleration time of the E wave, and IRT is the left ventricular isovolumic relaxation time (13).