Yazar "Kilic, A. Serkan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    THE EFFECT OF MENTAL STRESS ON SEMINAL MDA AND SEMEN PARAMETERS
    (Aves, 2005) Gozen, A. Serdar; Eskiocak, Sevgi; Kilic, A. Serkan; Molla, Sabahat
    Introduction: The prevalence of unexplained infertility is 15% among all infertility cases and mental distress has been suggested as a cause of it. Emotional stress can cause some abnormalities in semen parameters, although the basic biochemical principles of the relationship between mental stress and semen parameters are poorly understood. Recently there is emerging interest in reactive oxygen species (ROS) with respect of their unfavorable effect on fertility as a result of lipid peroxidation. In this study, the effects of mental stress on the Malondialdehyde (MDA) levels, an indirect indicator of lipid peroxidation and semen parameters were investigated. Materials and Methods: Semen samples were collected from 36 healthy volunteer students of the fourth semester of the medical school just before (stress period) and 3 months after (non-stress period) the final examinations by masturbation. Psychological stress of the participants was measured with the State Trait Anxiety Inventory. After standard semen analysis, MDA activity was measured in the seminal plasma. The data of the stress and non-stress periods were compared via paired samples t test. Correlation analysis between MDA levels and sperm parameters was made for both stress and non-stress periods. A value of p less than 0.05 was considered statistically significant. Correlations between MDA levels and sperm parameters also were examined by Pearson Correlation test. A value of p less than 0.05 was considered statistically significant. Results: During the stress period, stress scores were higher compared with the non-stress period (43.61 +/- 10.71 vs. 37.67 +/- 9.61). Our data showed that, sperm count, percentage of progressive motility and percentage of normal morphology significantly decreased during the stress period. Seminal plasma MDA levels were significantly higher during the stress period compared with the non-stress period (50.19 +/- 48.22 vs. 16.19 +/- 22.59 nmol/10(9) spermatazoa). There was a positive correlation between seminal plasma MDA levels and percentage immobility at 1/2 and 2nd hours at the stress period. And seminal plasma MDA level was found to correlate negatively with the percentage normal morphology and total sperm count. Conclusion: Our results indicate that mental stress can cause an unfavorable effect on semen parameters. Increased seminal plasma MDA levels at stress period may be a result of overproduction of ROS in semen. We would suggest that stress may cause oxidative stress in semen and in this way it could be responsible for male subfertility. We think that this subject deserves further studies.
  • Küçük Resim Yok
    Öğe
    Renal anatomical factors for the lower calyceal stone formation
    (Springer, 2006) Gozen, A. Serdar; Kilic, A. Serkan; Aktoz, Tevfik; Akdere, Hakan
    Purpose: The pathogenesis of urolithiasis is mainly explained with metabolic disorders. However metabolic disorders alone are not sufficient to explain this pathology. In the present study the anatomical differences in the lower calyceal stone formers were examined on both the stone forming and contralateral normal side. The objective was to assess the effect of lower pole renal anatomy on the lower calyceal stone formation. Materials and Methods: Between July 1999 and July 2004 39 patients with non-obstructed solitary lower pole stones were studied. Mean age was 47.02 years. The anatomic factors were determined on intravenous urograms (IVU). The renal length and width and the number of major and minor calices were noted. Lower pole infundibular calyceal length (ICL) and width (IW), lower infundibular length-to-width ratio were measured. The infundibulo-ureteropelvic angle (IUPA) was measured by two methods using the angle between infundibular and ureteral axes (IUPA-1), and between infundibular and ureteropelvic axes (IUPA-2). We examined a new parameter: Renal longitudinal axis-infundibulum angle (RIA) for renal stone formation. RIA was determined between two axes, including the axis connecting the central point of the pelvis opposite the margins of inferior and superior renal sinus to midpoint of renal axis and the longitudinal renal axis (Figure 2). The data of the stone forming and non-stone forming contralateral side were compared. Statistical analysis was performed by paired-t-test. Results: The IUPA-1 of the stone forming side was more acute than the non-stone forming side, in 77% of cases. The UIPA-2 of the stone forming side was more acute than the non-stone forming side, in 72% of cases. The differences with both methods between the stone forming and contralateral normal side were statistically significant (p < 0.05). Mean ICL of stone forming side was 30.20 mm whereas it was 25.51 mm in non-stone forming contralateral side. The difference between mean ICL values was statistically significant (p < 0.05). The mean infundibular length-to-width ratio was 8.55 +/- 3.25 on the stone forming side and 7.09 +/- 2.90 on the non-stone forming contralateral side. The difference between two groups was statistically significant (p < 0.05). The differences in RIA, infundibular width (IW), renal length, renal width and the number of major and minor calyces between stone forming and non-stone forming contralateral side were not statistically significant. Conclusion: Anatomical disorders of lower pole collecting system may be considered as factors contributing to stone formation. IUPA (1 and 2), ICL and ICL-to-IW ratio are significantly differing factors that might predispose to lower calyceal stone formation.