Doppler blood flow velocity waveforms in the fetal renal arteries: variability at proximal and distal sites in the right and left arteries
Doppler blood flow velocity waveforms in the fetal renal arteries: variability at proximal and distal sites in the right and left arteries
Objective:
To investigate variability in pulsatility/resistance indices and absolute velocities of blood flow in fetal renal arteries dependent on side and sampling site within each vessel.
Methods:
Doppler blood flow measurements of pulsatility index (PI), resistance index (RI) and peak systolic velocity (PSV) and end-diastolic velocity (EDV) were performed in the renal arteries of 27 fetuses between 236 and 247 days of gestation. Velocity waveforms were sampled in both the right and left renal arteries at two different sites: proximally, close to the aorta, and distally, before any major visible bifurcation of the vessels. The intraobserver variation was measured in 15 additional fetuses.
Results:
Mean values of PI and RI were similar in the right and left renal arteries and at the proximal and distal sampling sites of these arteries. Mean PSV and EDV were higher at the proximal compared to the distal site on both sides. For all parameters the 95% limits of agreement between measurements made in the right and left arteries and at proximal and distal sites were wide but tended to be narrower for the left renal artery and at the distal site. Intraclass correlation coefficients for intraobserver variability were 0.88, 0.89, 0.83 and 0.81 for PI, RI, PSV and EDV, respectively.
Conclusions:
It is important to standardize the precise site at which Doppler blood flow velocity waveform measurements are made in the renal arteries of the fetus. On the basis of our observations, we suggest that the left renal artery is the preferred vessel for sampling and that measurements should be made in the renal arterial trunk away from the aorta and before any visible branches.
blood flow velocity, Doppler, fetus, reliability, renal artery
590-593
Haugen, G.
3cb2a509-d772-44e6-9ee9-80c9b692233c
Godfrey, K.
0931701e-fe2c-44b5-8f0d-ec5c7477a6fd
Crozier, S.
1f39648f-d527-497f-bb40-319f487a0782
Hanson, M.
1952fad1-abc7-4284-a0bc-a7eb31f70a3f
2004
Haugen, G.
3cb2a509-d772-44e6-9ee9-80c9b692233c
Godfrey, K.
0931701e-fe2c-44b5-8f0d-ec5c7477a6fd
Crozier, S.
1f39648f-d527-497f-bb40-319f487a0782
Hanson, M.
1952fad1-abc7-4284-a0bc-a7eb31f70a3f
Haugen, G., Godfrey, K., Crozier, S. and Hanson, M.
(2004)
Doppler blood flow velocity waveforms in the fetal renal arteries: variability at proximal and distal sites in the right and left arteries.
Ultrasound in Obstetrics & Gynecology, 23 (6), .
(doi:10.1002/uog.976).
Abstract
Objective:
To investigate variability in pulsatility/resistance indices and absolute velocities of blood flow in fetal renal arteries dependent on side and sampling site within each vessel.
Methods:
Doppler blood flow measurements of pulsatility index (PI), resistance index (RI) and peak systolic velocity (PSV) and end-diastolic velocity (EDV) were performed in the renal arteries of 27 fetuses between 236 and 247 days of gestation. Velocity waveforms were sampled in both the right and left renal arteries at two different sites: proximally, close to the aorta, and distally, before any major visible bifurcation of the vessels. The intraobserver variation was measured in 15 additional fetuses.
Results:
Mean values of PI and RI were similar in the right and left renal arteries and at the proximal and distal sampling sites of these arteries. Mean PSV and EDV were higher at the proximal compared to the distal site on both sides. For all parameters the 95% limits of agreement between measurements made in the right and left arteries and at proximal and distal sites were wide but tended to be narrower for the left renal artery and at the distal site. Intraclass correlation coefficients for intraobserver variability were 0.88, 0.89, 0.83 and 0.81 for PI, RI, PSV and EDV, respectively.
Conclusions:
It is important to standardize the precise site at which Doppler blood flow velocity waveform measurements are made in the renal arteries of the fetus. On the basis of our observations, we suggest that the left renal artery is the preferred vessel for sampling and that measurements should be made in the renal arterial trunk away from the aorta and before any visible branches.
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More information
Published date: 2004
Keywords:
blood flow velocity, Doppler, fetus, reliability, renal artery
Identifiers
Local EPrints ID: 25599
URI: http://eprints.soton.ac.uk/id/eprint/25599
ISSN: 0960-7692
PURE UUID: bccb2b07-8244-4e5f-bb67-7a0a588d91ef
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Date deposited: 11 Apr 2006
Last modified: 16 Mar 2024 03:17
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Contributors
Author:
G. Haugen
Author:
S. Crozier
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