By J. H. C. Reiber Ph.D., P. W. Serruys M.D., C. J. Slager M.Sc. (auth.)
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Additional resources for Quantitative Coronary and Left Ventricular Cineangiography: Methodology and Clinical Applications
Example text
86. Sheehan FH, Bolson EL, Dodge HT, Mitten S: Centerline method - Comparison with other methods for measuring regional left ventricular motion. In: Ventricular Wall Motion. U. H. ). Georg Thieme Verlag, Stuttgart/New York: 139-149, 1984. 87. Brower RW, Meester GT: Spatial resolution and correlation between segments in regional wall motion studies of the left ventricle. Comp in Cardiol: 69-75, 1978. 88. Brower RW, Meester GT: Computer based methods for quantifying regional left ventricular wall motion from cine ventriculograms.
Values for each stenosis were compared to assess intra-observer (a-a, bob) and inter-observer (a-b) variability, D = mean difference in readings between first and second estimates. Lesions were grouped into following ranges of degree of stenosis (%): 0-9, 10-29, 30-49, 50-69, 70-89, 90-100, as shown on abscissa. Reproduced with permission from Shub et at. [110]. Meier et al. assessed the inter- and intraobserver variabilities in a PTCA-study, when using a calibrated magnifying glass for stenoses manually traced from a cineprojector [112].
In only 7/30 (23%) of the angiograms there was complete agreement among the three readers as to the projection demonstrating the most severe coronary stenosis before angioplasty, Visual interpretation of left main coronary artery stenosis by three groups of experienced angiographers on a group consensus basis, demonstrated a 41 % to 59% agreement on the severity of the lesion, with 80% agreement on whether the lesion was greater or less than 50% [113]. The severity of the lesion, its location, or presence of ectasia or calcium did not effect the discrepancy rate, whereas segments that were unusually short, diffusely diseased, or obscured by overlapping vessels were especially difficult to interpret.