Comparison of tissue Doppler velocities obtained by different types of echocardiography systems: are they compatible?
BACKGROUND
Both systolic and diastolic tissue Doppler (TD) velocities have an important diagnostic and prognostic role in cardiology. We aimed to compare TD velocities between two different echocardiography systems.


METHODS
Thirty-one consecutive patients (mean age: 65.2 +/- 17.5 years; 12 males) were enrolled.


METHODS
Systolic (Sa), early (Ea), and late (Aa) diastolic velocities were measured by TD at the lateral mitral annulus by a Sonos 2000 (Hewlett-Packard, Andover, MA, USA) and a Philips iE33 system. The E/Ea ratio was calculated.


RESULTS
Ea, Aa, and Sa velocities were higher when measured by the Sonos system (Ea: 13.2 +/- 4.1 cm/s vs. 8.3 +/- 3.6 cm/s; Aa: 14.8 +/- 3.8 cm/s vs. 9.3 +/- 2.3 cm/s; Sa: 15.2 +/- 3.6 cm/s vs. 8.4 +/- 2.0 cm/s; P < 0.0001 all). A significant correlation was found in Ea and in Ea/Aa (r = 0.84 and r = 0.85 resp; P < 0.0001 for both), and a weaker in Aa (r = 0.43; P = 0.02) between the machines. The Bland-Altman analysis showed broad limits of agreement between the measurements for Ea, Aa, and Sa (mean difference: 4.95 cm/s; 5.52 cm/s; 6.73 cm/s, respectively; limits: 0.64-9.25 cm/s; -1.39-12.39 cm/s; -0.37-13.83 cm/s, respectively). An E/Ea ratio >5.6 by the Sonos system showed 75% sensitivity and 79% specificity for elevated left ventricular filling pressure, defined as E/Ea >10 by the reference Philips system.


CONCLUSIONS
Although diastolic TD velocities had excellent correlations between the two machines, there was a systematic overestimation by the Sonos system. Since the limits of agreement do not allow replacing the measurements, we suggest using the same echocardiographic equipment at patient follow-up.
Dénes
Mónika
M
Gottsegen György Hungarian Institute of Cardiology, H-1096 Budapest, Hungary. denesmoni@gmail.com
Farkas
Katalin
K
Erdei
Tamás
T
Lengyel
Mária
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001783:Blood Flow Velocity; D015150:Echocardiography, Doppler / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012372:ROC Curve