several factors improved the quality of fixation : ( 1 ) start of perfusion-fixation within 15 min after clamping of the renal vessels , ( 2 ) careful handling of the kidney during nephrectomy , ( 3 ) simultaneous clamping of the main renal vessels , and ( 4 ) employment of a spasmolytic drug .
C0027695
nephrectomy
C0022646
renal