RATIONALE AND OBJECTIVES: We evaluated the changes in the down-stream Doppler waveforms caused by a proximal @entity850 in the main renal artery of @entity235 . METHODS: Renal parenchymal arterial waveforms downstream from mild (< 50%), moderate (50-75%), and severe (76-95%) stenoses were compared with nonstenotic baseline waveforms in five mongrel @entity235 . Waveform shapes were categorized as biphasic or monophasic. The percentage of biphasic and monophasic waveforms was determined for each @entity850 . The acceleration index (AI) and the @entity1054 ( @entity1054 ) were determined using traditional and modified calculations (AI' and @entity1054 '). Late systolic deceleration (DS), @entity15071 ( @entity15071 ), and the resistive index (RI) also were measured. RESULTS: @entity1054 , AI', and @entity1054 ' demonstrated significant differences between the severe stenoses and nonstenotic baselines (p < .05); however, there was no difference between the mild and moderate stenoses versus baselines. The percentage distribution of monophasic and biphasic waveforms was highly correlated with the degree of @entity850 . Monophasic waveforms increased on average from 22.5% of baseline waveforms to 76.5% of waveforms in the severe stenoses. Biphasic waveforms decreased on average from 69.9% of baseline waveforms to 18.7% of waveforms in the severe stenoses. CONCLUSION: Quantitative evaluation of the downstream waveform parameters (AI, @entity1054 , AI', @entity1054 ', DS, @entity15071 , and RD in the @entity235 kidney is not sufficiently accurate, but calculation of the percentage of the monophasic and biphasic waveforms present may be useful to predict a hemodynamically significant @entity2791 (> or = 50%).

Effect of a main XXXX on the downstream Doppler waveform in @entity235 .

@entity235 :: ('9615', 'Species') :: ['dog', 'dogs'] @entity2791 :: ('MESH:D012078', 'Disease') :: ['renal artery stenosis'] @entity15071 :: ('MESH:C563897', 'Disease') :: ['DD', 'diastolic deceleration'] @entity850 :: ('MESH:D003251', 'Disease') :: ['stenosis'] @entity1054 :: ('MESH:D000377', 'Disease') :: ['acceleration time', 'AT']
@entity2791 :: (MESH:D012078,Disease) :: ['renal artery stenosis']
