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Objective  To determine the risk factors for erectile dysfunction (ED) in male patients with acromegaly and to prospectively investigate the short-term changes of erectile function after surgery or medical treatment.    Methods  Sixty-three male patients were subjected to nocturnal penile tumescence and rigidity (NPTR) test for the evaluation of erectile function. The measurement of serum nitric oxide (NO) was also performed. Twenty-seven patients were re-evaluated by NPTR after surgery or long-term somatostatin analogues (SSA) treatment.    Results  Twenty-two patients (34.9%) had ED. Patients with ED showed higher random GH (17.89 [10.97-44.19] μg/L  vs  11.63 [4.31-28.80] μg/L,  p  = 0.020) and GH nadir (GHn) (10.80 [6.69-38.30] μg/L  vs  8.76 [3.62-18.19] μg/L,  p  = 0.044) during oral glucose tolerance test (OGTT). The NO levels of ED patients were lower than non-ED patients (9.15 [5.58-22.48] μmol/L  vs  16.50 [12.33-31.78] μmol/L,  p  = 0.012). After treatment, patients who present improvement in erectile function showed lower post-GHn (0.07 [0.03-0.12] ng/ml  vs  1.32 [0.09-3.60] ng/ml,  p  = 0.048) and post-IGF-1 index (1.03 ± 0.38  vs  1.66 ± 0.95,  p  = 0.049). The multivariate analysis indicated post-GHn was still associated with the improvement of erectile function after correction of other covariates (OR: 0.059, 95% CI: 0.003-1.043,  p  = 0.053).    Conclusions  Excessive GH is related to ED in male patients with acromegaly. GH normalization after treatment is beneficial for short-term erectile function recovery.

Erectile Dysfunction Is Associated With Excessive Growth Hormone Levels in Male Patients With Acromegaly