The Effect of Heart Rate on Color M-Mode Doppler Flow Propagation Velocity and Continuous-Wave Doppler Parameters in Aortic Insufficiency Alper O. Onbasili, Tarkan Tekten, Ceyhun Ceyhan, Tunca Piskin |
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Background and aim of the study: The results
of previous studies have suggested that an increase in heart rate (HR)
may have a beneficial effect on the hemodynamic condition of patients
with aortic regurgitation (AR), and reduce AR severity. An increase in
HR was shown to cause a significant increase in regurgitant slope and
to significantly shorten the pressure half-time (PHT), both of which
are considered to be signs of worsening regurgitation. Color M-mode Doppler
flow propagation velocity (FPV) was used to assess AR severity, but no
data were available regarding the effects of HR on FPV measurement of
AR. The study aim was to evaluate the effect of HR on FPV, and to compare
FPV and continuous-wave (CW) Doppler parameter (PHT and slope) variations
resulting from an increase in HR. |
FPV, while CW Doppler was used in PHT and slope measurements.
Atropine sulfate was titrated in all patients to achieve at least a 20%
increase in HR. The FPV, PHT, slope and regurgitant fraction (RF) of AR
were measured before and after the increase in HR. Results: An increase in HR (77.8 ± 8.9 versus 103 ± 9.9 bpm; p <0.001) caused a decrease in color M-mode Doppler FPV (51 ± 21 versus 44 ± 19 cm/s), in the PHT of the regurgitant velocity curve (468 ± 154 versus 411 ± 128 ms), and in the RF of the AR (30.2 ± 16.3 versus 26.1 ± 14%). The slope of the regurgitant velocity was increased (291 ± 136 versus 358 ± 122 cm/s2). All of these variations were statistically significant. Conclusion: An increase in HR caused a decrease in the FPV and RF of the aortic regurgitation, and both changes were signs of improved regurgitation. FPV appears to be a more valuable parameter than CW Doppler parameters in determining improvements in AR resulting from an increase in HR. |
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