Measuring the Resistivity Index

Renal vascular resistance increases during acute obstruction, particularly during the first 6-48 h (Ulrich et al. 1995). This increase is related to vasoconstriction mediated by different factors such as prostaglandins. Using these parameters, Shokeir et al. (2000) indicated that a resistivity index of at least 0.7 diagnoses obstruction, with a sensitivity of 77% and a specificity of 83 %, with 88 % sensitivity and 98 % specificity if the resistiv-ityindex's variation is greater than 0.06. This measurement's performance is flawed, however, when the measurement is taken before 6 h or after 48 h, in cases of single kidney, of pathological kidney, or when nonste-roidal anti-inflammatory drug (NSAID) treatment interfering with the metabolism of prostaglandins is used (Shokeir et al. 2000; Ulrich et al. 1995).

7.3 Diagnostic Procedures in the Pregnant Patient

Back Pain Relief

Back Pain Relief

This informational eBook will present you with the most recent research and findings available so that you can learn more about Back Pain relief, covering as many bases as possible from A to Z.

Get My Free Ebook

Post a comment