The use of isovolumic contraction velocity to determine right ventricular state of contractility and filling pressures A pulsed Doppler tissue imaging study.
OBJECTIVE
Echocardiographic techniques have not so far been able to provide a good estimation of myocardial contractility in humans. Myocardial motion during the isovolumic contraction phase, measured by Doppler tissue imaging, has only recently in experimental models been shown to describe myocardial contractility. The aim of the present clinical study was to investigate the relationship between right ventricular isovolumic contraction velocity and right ventricular state of contractility.


RESULTS
Doppler tissue imaging and cardiac catheterization were performed simultaneously in 26 consecutive patients with different cardiac diseases (18 males, mean age 52 +/- 12, range 23-75 years). Peak isovolumic contraction velocity was measured using Doppler tissue imaging at 2 levels of the right ventricular free wall. During cardiac catheterization, the first derivative of right ventricular pressure related to the pulmonary artery peak pressure (dP/dt/P(max)) was measured. Furthermore, right ventricular end diastolic pressure, right atrial mean pressure, pulmonary artery systolic pressure, and pulmonary artery resistance, were also measured. A significant relationship was found between isovolumic contraction velocity and dP/dt/P(max) (r = 0.59, p < 0.01). This relationship was strengthened after excluding patients with elevated right atrial pressures (r = 0.77, p < 0.001). Furthermore, a correlation was also found between basal and mid cavity isovolumic contraction velocity and right ventricular end diastolic pressure (r = -0.47, r = -0.49, p < 0.05) as well as right atrial mean pressure (r = -0.63, r = -0.55, p < 0.01).


CONCLUSIONS
Isovolumic contraction velocity is a reproducible and easily obtainable non-invasive parameter which correlates with invasive measurements of right ventricular state of contractility and right ventricular filling pressures.
Department of Public Health & Clinical Medicine, Umeå University Hospital, Umeå, Sweden.
Per
P
Lindqvist
Anders
A
Waldenström
Gerhard
G
Wikström
Elsadig
E
Kazzam
D000328:Adult; D000368:Aged; D006328:Cardiac Catheterization; D018619:Echocardiography, Doppler, Pulsed; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction / Q000502:physiology*; D011446:Prospective Studies; D013318:Stroke Volume / Q000502:physiology; D018497:Ventricular Dysfunction, Right / Q000000981:diagnostic imaging*