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

Dealing With Back Pain

Dealing With Back Pain

Deal With Your Pain, Lead A Wonderful Life An Live Like A 'Normal' Person. Before I really start telling you anything about me or finding out anything about you, I want you to know that I sympathize with you. Not only is it one of the most painful experiences to have backpain. Not only is it the number one excuse for employees not coming into work. But perhaps just as significantly, it is something that I suffered from for years.

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