Objective To determine whether bladder distension affects venous haemo
dynamics during transurethral resection of the prostate (TURP) such th
at irrigating fluid is more easily absorbed. Patients and methods The
right common femoral vein was examined using an ultrasound Doppler blo
od-flow scanner in 10 patients (mean age 73 years, range 63-80) underg
oing TURP. Measurements of blood now were performed before, during and
after the bladder was filled with irrigating solution. Fluid absorpti
on was measured by the ethanol method. Results Measurements before, ha
lf-way through and immediately after the resection all showed that the
luminal diameter and the cross-sectional area of the femoral vein inc
reased significantly when the bladder was filled with irrigating fluid
. Furthermore, a decrease in the normal variation of blood now with br
eathing often occurred when the bladder was filled, indicating that pr
oximal venous obstruction was the cause of the increase in vessel diam
eter. However, there was no apparent association between these changes
and the absorption of irrigating fluid. Conclusions Filling the bladd
er with irrigating fluid with the patient in the lithotomy position du
ring TURF was followed by signs of iliac venous obstruction but this d
id not correlate with the absorption of irrigating fluid.