Journal article
Reproducibility of quantitative backscatter echocardiographic imaging in normal subjects
The American journal of cardiology, Vol.69(5), pp.542-546
1992
DOI: 10.1016/0002-9149(92)91001-K
PMID: 1736621
Abstract
Cyclic backscatter variation is useful in differentiating normal from ischemic and myopathic myocardium; however, there are few data on the reproducibility of clinical cyclic variation measurements. Therefore, a study using 2-dimensional and M-mode backscatter imaging was performed in 20 normal male subjects by 2 observers at an initial session and by 1 of the observers after 1 week. Cyclic variation on M-mode was calculated as the difference between the end-diastolic backscatter and the backscatter at the nadir. Two-dimensional determinations of backscatter were made using a single frame at end-diastole and one at end-systole. The cyclic change was the difference between backscatter measured in the end-diastolic and end-systolic frames. There were no statistically significant differences in analysis of variance among the grouped repeated measurements in either the interventricular septum or the posterior left ventricular wall. At the initial session, cyclic backscatter variation in the posterior wall using M-mode techniques was 5.9 ± 1.8 dB (SD). The cyclic change in backscatter in the septal wall, using the 2-dimensional technique, was 4.3 ± 2.4 dB. In the posterior wall, the cyclic change in backscatter was 5.7 ± 1.7 dB. Pairwise observer correlations between repeated measurements ranged from −0.48 to 0.45. Thus, although there were no significant differences in group means on repeat measurements, repeated measurements in individual subjects were not reliably reproduced because of limited independent sampling of backscatter measurements at only 2 points in the heart cycle. Increased independent sampling and measurement from a backscatter waveform throughout the cardiac cycle may improve reproducibility of measurements.
Details
- Title: Subtitle
- Reproducibility of quantitative backscatter echocardiographic imaging in normal subjects
- Creators
- John E Stuhlmuller - From the Cardiovascular Center, Iowa City, Iowa, USADavid J Skorton - From the Cardiovascular Center, Iowa City, Iowa, USATrudy L Burns - From the Cardiovascular Center, Iowa City, Iowa, USAHewlett E Melton - From the Cardiovascular Center, Iowa City, Iowa, USAByron F Vandenberg - From the Cardiovascular Center, Iowa City, Iowa, USA
- Resource Type
- Journal article
- Publication Details
- The American journal of cardiology, Vol.69(5), pp.542-546
- Publisher
- Elsevier Inc
- DOI
- 10.1016/0002-9149(92)91001-K
- PMID
- 1736621
- ISSN
- 0002-9149
- eISSN
- 1879-1913
- Language
- English
- Date published
- 1992
- Academic Unit
- Radiology; Epidemiology; Cardiovascular Medicine; Fraternal Order of Eagles Diabetes Research Center; Internal Medicine
- Record Identifier
- 9984094633402771
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