[Non-invasive estimation of dP/dt of the left ventricle: is the measurement taken during the isovolumetric contraction?].
Left ventricular dP/dt is estimated from mitral regurgitation (MR) jet as the rate of pressure rise (RPR) from 1 to 3 m/sec. In order to establish if this measure is made during the isovolumetric contraction (IC), we with MR studied 38 patients (age average 51 +/- 8 years) of different etiology. IC was estimated as pre-ejection time minus Q-first sound (S1). Velocity of the MR was measured at the onset and at the end of IC to estimate RPR during IC and time from 1 m/s to S1 (T1-S1) to indicate the mismatch between the two methods.


RESULTS
There was not difference between RPR 1 to 3 m/s and RPR (IC). T 1-S1 was 26 +/- 24 ms indicating that the measure of RPR 1 to 3 m/s was made prior to the onset of IC.


CONCLUSIONS
Noninvasive assessment of left ventricular dP/dt from 1 to 3 m/s is made prior to the onset of IC.
Migliore
R A
RA
Hospital Eva Perón, Cerrito 2569, San Martín (1650), Pcia. de Buenos Aires, Argentina.
Adaniya
M E
ME
Miramont
G
G
Guerrero
F T
FT
Tamagusuku
H
H
D000465:Algorithms; D000704:Analysis of Variance; D015150:Echocardiography, Doppler; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000000981:diagnostic imaging / Q000503:physiopathology*; D009200:Myocardial Contraction / Q000502:physiology*; D011446:Prospective Studies; D012039:Regional Blood Flow; D012044:Regression Analysis; D013997:Time Factors; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging / Q000503:physiopathology*