Renal Vascular Resistance Measured During Reconstruction Of The Stenosed Renal Artery

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Abstract
Flow and pressure in the renal artery were measured in 12 hypertensive patients operated on for renal artery stenosis. The kidney was perfused with Ringer's solution containing lidocaine prior to the arterial reconstruction. The resistance was calculated across the stenosis (R9) and in the vascular bed of the kidney (Rk). Rk decreased in average 46 per cent after the reconstruction, as compared to the values obtained before. In nine cases, where the arterial hypertension regressed later on, the minimum value for Rk was calculated to be a mean of 0.42, while in two cases with severe peripheral vascular changes Rk was 1.0 and 1.3, respectively. It is suggested that assessment of the renal vascular resistance under standard conditions might be of prognostic value for the result of the arterial repair. Perfusion of the renal artery with Ringer's solution containing lidocaine or antirenin is proposed as a means of achieving such conditions.