Introduction:Bilateral nephrectomy leads to a short-term reduction in blood pressure. This
is mainly due to a sharp change in the circulating renin-angiotensin system
(RAS), but data on the long-term outcomes of their clinical status and
further changes in circulating RAS are rare.Materials and methods:We enrolled four Chinese patients who had both of their kidneys removed two
(1), six (1) and eight (2) years prior to this study, respectively. Their
clinical data were collected retrospectively and circulating RAS was
evaluated by radioimmunoassay.Results:Hypotension after surgery occurred in two patients who suffered thrombosis of
the arteriovenous fistula, but no life-threatening complications occurred.
The average hemoglobin level was 103.3±12.3 g/l. Two patients without
hemorrhage received intravenous erythropoietin (EPO) of 4500–8000 iu/week.
Extremely low plasma renin activity (PRA) of 0.08±0.03 ng/ml (normal range
0.93–6.56 ng/ml) showed in the patients. Surprisingly, plasma angiotensin II
concentration (71.37±8.28 pg/ml) and aldosterone level
(0.17±0.02 ng/mlng/ml) were within the normal range.Conclusions:The four anephric individuals did not suffer life-threatening complications
while their hypotension gradually subsided and their EPO dosage was
relatively low. Although their PRA level was extremely low, they produced
normal levels of angiotensin II and aldosterone in plasma, which indicates
the kidney-independent mechanism of angiotensin II production likely
compensated in the long term.