To investigate the characteristics of peroperative blood pressure and heart rate in patients with normotensive incidental pheochromocytomas in order to provide the basis for peroperative treatment.

This retrospective study collected the data of 104 patients with a pathological diagnosis of unilateral pheochromocytoma at PLA General Hospital during January 2011 to December 2016. They were divided into normotensive incidental pheochromocytomas(NIP)group(n=50)if the patients were normotensive and HIP group(n=54)if the patients were with hypertension. The clinical features, imaging features and peroperative hemodynamics were analyzed.

(1)The age, urinary norepinephrine, daily dosage and duration of phenoxybenzamine in NIP group were less than those of HIP group(all P<0.05). (2)Preinduction blood pressure, maximum blood pressure, and total fluid intake in NIP group were lower than those in HIP group(all P<0.05). The blood pressure range, heart rate range, increased blood pressure, minimum mean arterial pressure, vasoactive medication were without statistical significance between these two groups.(3)The times and rate of intraoperative systolic blood pressure more than 30% baseline, 200 mmHg(1 mmHg=0.133 kPa), 180 mmHg, 160 mmHg, intraoperative tachycardia, bradycardia, intraoperative hypotension and postoperative hypotension were without statistical significance between these two groups.(4)Stratified analysis of age(50 years), phenoxybenzamine(40 mg/d), tumor diameter(50 mm)and preinduction blood pressure(130/80 mmHg)showed that intraoperative blood pressure and heart rate were without statistical significance between these two groups.(5)There was no correlation between phenoxybenzamine(daily dosage or duration)and peroperative hypotension. Applying phenoxybenzamine or vasoactive medication was not correlated with peroperative hypotension in NIP group.

The peroperative blood pressure and heart rate of patients with NIP are similar to those of patients with HIP. Adequate peroperative treatment should be applied to NIP to avoid hemodynamic instability. (Chin J Endocrinol Metab, 2018, 34: 466-471)

Pheochromocytoma; Hypertension; Peroperation; Blood pressure; Heart rate