Experience
with Portable Ultrasound Equipment and Measurement of
Urine Volumes: Inter-User Reliability and Factors of
Patient Position
Teresa
L. Massagli, Diana D. Cardenas, and Eve W. Kelly. "Experience
with Portable Ultrasound Equipment and Measurement of
Urine Volumes: Inter-User Reliability and Factors of
Patient Position." Journal of Urology 142 (October
1989): 969-971.
Objectives:
* To assess the effect of patient position on the accuracy
of ultrasound bladder volume measurement, and to determine
the inter-user reliability of the portable ultrasound
bladder volume instrument.
Methods:
* Sixteen hospitalized adults with neurogenic bladders
managed by intermittent catheterization participated
in the study.
* Two investigators made ultrasound measurements of
bladder volume using the BladderScan®
BVI 2000. Ultrasound measurements were performed just
before catheterization, and ultrasound volumes were
compared to urine volumes obtained by catheterization.
One investigator was a trained and regular user of the
BVI 2000, while the other had never used the instrument
before.
* Ultrasound measurements were made with the subject
in either a supine or a sitting position. Measurements
in both positions were not obtained at the same time,
to avoid operator bias.
* Each subject was measured four times, twice in a supine
position, and twice in a seated position. Each set of
ultrasound and catheterization urine volumes was treated
as an independent observation.
Results:
* Correlation coefficients between ultrasound volumes
measured by the 2 examiners were r = 0.92 (p < 0.001)
for the seated position and r = 0.90 (p < 0.001)
for those in the supine position.
* Analysis of the variance of the mean difference for
ultrasound minus true volume showed no significant differences
among examiners (p > 0.25) or positions (0.10 <
p < 0.25).
Conclusions:
* "We found that accuracy and precision were not
significantly different in the 2 positions (supine and
seated), and were acceptable for clinical use."
* "We [further] verified that no significant technical
training is necessary for users of this equipment and
found that inter-user reliability is good."
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