Copyright © 2004, The European Society of Cardiology
The use of isovolumic contraction velocity to determine right ventricular state of contractility and filling pressures
A pulsed Doppler tissue imaging study
aDepartment of Public Health & Clinical Medicine, Umeå University Hospital, Umeå, Sweden
bDepartment of Cardiology, Uppsala University Hospital, Uppsala, Sweden
cDepartment of Internal Medicine, Faculty of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
Received 8 August 2004; .
* Corresponding author. Department of Internal Medicine, Faculty of Medicine and Health Sciences, United Arab Emirates University, P.O. Box 17666, Al-Ain, United Arab Emirates. Tel.: +971 3 7039654; fax: +971 3 7670361.E-mail: kazzam@uaeu.ac.ae
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Abstract |
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Aims 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.
Methods and 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/Pmax) 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/Pmax (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).
Conclusion 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.
Keywords: Cardiac catheterization; Contractility; Doppler tissue imaging; Isovolumic contraction velocity; Right ventricular function