ABSTRACT
[Summary] Eighteen patients with idiopathic hypogonadotropic hypogonadism( IHH) receiving aromatase-inhibitor( AI) letrozole for at least 3 months were recruited.After 3 months′treatment, LH levels were increased from (2.1 ±1.5) IU/L to (3.6 ±3.7) IU/L(P=0.029), and FSH levels from (2.6 ±1.8) IU/L to (4.3 ±3.4) IU/L (P=0.003).Total testosterol was increased from (87 ±42) ng/dl to (166 ±200) ng/dl(P=0.082), and estradiol wasdecreasedfrom(22.7±18.7) pg/ml to (13.4±10.6) pg/ml(P=0.020).The average testis volume was increased[(14.3 ±3.9 vs 11.2 ±4.9) ml, P<0.01].Sperms were detected in 8 out of 9 patients who did seminal fluid test.The result of general linear model showed that LH(60 min) was significantly related with total testosterol increment( P=0.045) .