جستجوی مقالات مرتبط با کلیدواژه "انزال" در نشریات گروه "پزشکی"

It is well established that ghrelin has effect on gonadotropin and androgen release through its receptors on hypothalamus, pituitary and gonads. The amount of synthesis and release of these hormones directly affect on reproductive behavior in mammals. Therefore, it is expected that ghrelin can affect sexual behavior of mammals. The aim of the present study was to investigate the effects of intracerebroventricular injection of ghrelin on sexual behavior of male rat. Forty male Wistar rats, weighing 200±20 g, were divided into four groups. The animals received saline or 2, 4 or 8 nmol ghrelin through the stereotaxically implanted cannula into the third cerebral ventricle. The sexual behavior indices of male rats were evaluated encountering with female rats 10 min after injection of the ghrelin or saline. As well as the locomotor activity of male rats was investigated by open-field test. Then the experimental data were statistically analyzed by one-way analysis of variance (ANOVA) followed by Tukey’s test. Four and 8 nmol injection of ghrelin caused significant increase in the mount (p<0.05), intromission and ejaculation (p< 0.001) latency compared to the control group. Also the 4 and 8 nmol doses of ghrelin led to a significant increase in the number of mount (p<0.05) and a significant decrease in the number of ejaculation (p<0.001) compared to control animals. No significant changes were observed in the number of intromission after ghrelin injection. Comparison of sexual activity index and copulatory efficiency in the studied groups indicated a significant (p<0.05) decrease in reproductive activity of 4 and 8 nmol ghrelin-received animals compared to the control group. As well we observed a significant increase in locomotor activity of 2 nmol (p<0.01) and 4 and 8 nmol (p<0.001) ghrelin-received animals compared to control group. Intracerebroventricular injection of ghrelin suppressed the sexual behavior of male rats dose-dependently, whereas increased the locomotor activity.

In fertility clinics and diagnostic laboratories, a great number of male subjects undergo urinary sampling for urine analysis (U/A) after semen sampling.Despite taking thorough medical histories in these centers, questions on intercourses or ejaculations prior to the sampling are occasionally neglected. Due to the noticeable increases in urinary protein upon S/A and the possibilities for U/A parameters distortion, this study was undertaken to compare urinary indices before and after semen sampling. Urine samples were obtained from 220 men attending Avicenna Infertility Clinic in Tehran, Iran, before and after semen sampling and two urinalyses were done for each patient. Eventually, the findings were statistically compared and analyzed. Biochemical and physical characteristics of urine samples, including color, blood, ascorbic acid, urobilinogen, bilirubin, nitrite, ketone, glucose and specific gravity did not undergo significant changes after semen sampling, while turbidity and protein were increased (p<0.001) and urine pH was decreased but with no statistical significance (p=0.46). It is recommended to ask about ejaculation or prior intercourses before urine sampling for urinalysis, especially at times when urinary protein is of importance. This will avoid unnecessary, additional diagnostic testing, which in turn will prevent psychological distress and save money and time.