Volkan Sen
Dokuz Eylül University
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Featured researches published by Volkan Sen.
Urology | 2015
Ozan Bozkurt; Omer Demir; Volkan Sen; Adil Esen
OBJECTIVE To evaluate the sexual side effects including ejaculation after silodosin treatment in potent men with regular sexual activity, as well as possible alterations in seminal vesicle volume. METHODS Sexually active patients aged ≥ 40 years with moderate to severe lower urinary tract symptoms were enrolled prospectively. International Prostate Symptom Score (IPSS) and Quality of Life (QoL), International Index of Erectile Function (IIEF) questionnaire, ejaculation frequency, and seminal vesicle volumes measured by transrectal ultrasonography were determined at study entry, and silodosin 8 mg/d was prescribed for 4 weeks. Alterations in IPSS-QoL, all domains of IIEF, ejaculation frequency, seminal vesicle volumes, and patient-reported side effects were evaluated after silodosin treatment. RESULTS Thirty patients were included, and mean age was 56.7 ± 6.9 years (44-70 years). IPSS-total, IPSS-storage, and IPSS-voiding subscores and QoL were significantly improved after treatment. Despite a slight decrease in erectile function domain of IIEF (26.7 ± 1.9 vs 22.9 ± 7.5; P <.05), no significant change was determined for orgasmic functions, sexual desire, intercourse satisfaction, and overall satisfaction. Ninety percent of patients (27 of 30) had impaired ejaculation, and seminal vesicles were significantly enlarged at the end of treatment (8.1 ± 6.4 vs 16.4 ± 8.2 cc; P <.001). CONCLUSION Impaired ejaculation is a common problem for sexually active men treated with silodosin, and this may result in the slight decrease in erectile functions. Enlargement of seminal vesicles may represent for the loss of seminal emission and accumulation of seminal vesicle secretion. Further studies are required for better clarifying the effects of silodosin on sexual functions including ejaculatory functions.
Cuaj-canadian Urological Association Journal | 2015
Volkan Sen; Ozgu Aydogdu; Ibrahim Halil Bozkurt; Tarik Yonguc; Pinar Sen; Salih Polat; Tansu Degirmenci; Deniz Bolat
INTRODUCTION We aimed to demonstrate the efficacy, safety, and convenient use of fosfomycin trometamol in the preoperative antibiotic prophylaxis (PAP) of transrectal ultrasound-guided biopsy of the prostate (TRUSBP) in this prospective, randomized study. METHODS Between May 2014 and May 2015, a total of 300 patients who underwent TRUSBP were examined prospectively. Patients were randomized into two groups: group 1 consisted of 150 patients who were administered a single dose of 3 g oral fosfomycin as a PAP the night before the procedure; group 2 consisted of 150 patients who were administered 500 mg oral ciprofloxacin 60 min before the procedure as a PAP. Post-procedural febrile and afebrile infectious complications and pathological characteristics of the two groups were compared prospectively. RESULTS The mean age of the patients was 63.5±0.6 years in group 1 and 62.9±0.6 years in group 2. A total of two patients (1.3%) in group 1 and nine patients (6.0%) in group 2 experienced afebrile urinary tract infection (UTI). Afebrile UTI rate was significantly higher in group 2 (1.3% s. 6.0%, p=0,032). Febrile UTI was detected in two patients in group 2 and one patient in group 1. Urine cultures revealed 35.7% fluoroquinolone resistance. As a limitation, although the sample size was appropriate due to the power calculation, we believe that comprehensive studies including larger patient cohorts are needed to support our findings. CONCLUSIONS Due to its ease-of-use with only a single dose and lower rates of infectious complications (resistant and febrile UTIs), fosfomycin trometamol is a strong alternative for antibiotic prophylaxis in TRUSBP.
Urology | 2015
Ibrahim Halil Bozkurt; Ozgu Aydogdu; Tarik Yonguc; Omer Koras; Volkan Sen; Serkan Yarimoglu; Tansu Degirmenci
OBJECTIVE To investigate the natural history of white blood cell (WBC) values and incidence of leukocytosis after percutaneous nephrolithotomy (PCNL), factors associated with development of postoperative leukocytosis, and predictive value of WBC count for infection. METHODS A total of 303 patients who underwent PCNL for renal stones were included in the recent study. Electronic medical records of the patients were reviewed retrospectively to collect daily serum leukocyte counts and perioperative cultures. WBC count was followed daily for patients with positive urine culture and/or postoperative fever until leukocyte levels turned to normal limits. RESULTS Leukocytosis was detected in 133 of the 303 patients (43.9%). The mean preoperative and postoperative WBC counts were 7.73 ± 2.01 × 10(6) cells/μL and 11.9 ± 3.31 × 10(6) cells/μL, respectively. The average postoperative WBC count increased by 4.2 ± 2.99 × 10(6) cells/μL over the first 2 postoperative days. Receiver operating characteristic curve analysis resulted in an area under the curve of 0.87 and 0.80 for postoperative WBC count and absolute WBC count difference, respectively. The thresholds provided by the analysis were 14.05 × 10(6) cells/μL and an increase greater than 5.25 × 10(6) cells/μL, respectively. CONCLUSION Our data show postoperative leukocytosis is common after PCNL and represents a normal physiologic response to surgery. Our study demonstrated that 14.05 × 10(3) × 10(6) cells/μL WBC count and absolute difference in WBC count from baseline of 5.25 × 10(3) × 10(6) cells/μL were significantly associated with post-PCNL sepsis development. Further studies are needed to determine the significance of leukocytosis for infectious complications after PCNL.
Kaohsiung Journal of Medical Sciences | 2016
Volkan Sen; Ibrahim Halil Bozkurt; Ozgu Aydogdu; Tarik Yonguc; Serkan Yarimoglu; Pinar Sen; Omer Koras; Tansu Degirmenci
We evaluated the usefulness of preoperative neutrophil–lymphocyte count ratio (NLCR) in predicting postoperative sepsis after percutaneous nephrolithotomy (PCNL). In total, 487 patients who underwent PCNL for renal stones were included in the present retrospective study. The stone burden, number of tracts and location, operation time, fluoroscopy time, presence of residual stones, and blood transfusion rates were postoperatively recorded in all patients. All patients were followed up for signs of systemic inflammatory response syndrome (SIRS) and sepsis. The association of sepsis/SIRS with the risk factors of infectious complications, including NLCR, was evaluated. SIRS was detected in 91 (18.7%) patients, 25 (5.1%) of whom were diagnosed with sepsis. Stone burden, operation time, irrigation rate, previous surgery, nephrostomy time, access number, blood transfusion, residual stone, postoperative urinary culture, renal pelvis urinary culture, and stone culture were found to be predictive factors for SIRS and sepsis development. Receiver operating characteristic curve analysis revealed an NLCR cutoff of 2.50 for predicting the occurrence of SIRS/sepsis. We found that the incidence of sepsis was significantly higher in patients with NLCR ≥ 2.50 than in patients with NLCR < 2.50 (p = 0.006). Preoperative and postoperative urine culture positivity were associated with high NLCR (p = 0.039 and p = 0.003, respectively). We believe that preoperative NLCR may be a promising additive predictor of bacteremia and postoperative sepsis in patients who undergo PCNL for renal stones. This marker is simple, easily measured, and easy to use in daily practice without extra costs.
Cuaj-canadian Urological Association Journal | 2015
Deniz Bolat; Ozgu Aydogdu; Zeki Tuncel Tekgul; Salih Polat; Tarik Yonguc; Ibrahim Halil Bozkurt; Volkan Sen; Onur Okur
INTRODUCTION In this prospective randomized controlled study, we investigated the efficacy of obturator nerve block (ONB) on adductor muscle spasm and related short-term outcomes and complications in patients who underwent transurethral resection of lateral wall-located bladder tumours (TURBT). METHODS Between July 2014 and February 2015, 70 patients scheduled to undergo TUR of lateral bladder wall tumours were enrolled in the study. All patients were preoperatively evaluated by cystoscopy and imaging tools and selected according to localized tumours on the lateral bladder wall. Patients were randomly allocated to Group SA (35 patients who underwent only spinal anesthesia) and Group ONB (35 patients who underwent spinal anesthesia combined with ONB by the nerve stimulator). An independent observer, blinded to the approach, evaluated the obturator signs, including adductor muscle contraction, bladder perforation, and completeness of the resection during the TURBT procedure. RESULTS The differences between groups regarding mean operation time, tumour size, and number were not statistically significant (p > 0.05). Adductor muscle contraction was detected in 40% of patients in Group SA and 11.4% in Group ONB. This difference was statistically significant (p = 0.021). Complete bladder perforation was detected in 2 patients in Group SA, whereas no perforation was observed in Group ONB. There was no case of severe bleeding in both groups. CONCLUSIONS We found that ONB performed after spinal anesthesia was effective in preventing intraoperative complications due to adductor muscle spasm while performing TURBT. Our study limitations include its small sample size, since we only enrolled patients with primary lateral wall-localized bladder tumour. Also, we excluded patients who underwent bipolar TURBT.
Urology | 2011
Omer Demir; Onur Kizer; Volkan Sen; Adil Esen
Persistent mullerian duct syndrome is a rare disease that occurs in men with a completely normal phenotype and is characterized by the presence of mullerian duct structures. Diagnostic laparoscopy can reveal an appearance consistent with a uterus, fallopian tubes, or ovotestes.
Cuaj-canadian Urological Association Journal | 2015
Volkan Sen; Ozgu Aydogdu; Tarik Yonguc; Ibrahim Halil Bozkurt; Salih Polat; Ismail Basmaci
Bilateral collecting system duplication is a very rare abnormality, including the splitting of the ureteric bud. Complete ureteral duplication with two separate openings in the urinary bladder is also extremely rare. To the best of our knowledge, we present the first case of bilateral ureteral stones in bilateral duplicated collecting system.
Urologia Internationalis | 2017
Omer Demir; Volkan Sen; Bora Irer; Ozan Bozkurt; Adil Esen
Introduction: This study aimed to evaluate the prevalence and possible risk factors of urinary incontinence (UI) among women aged 18 or older living in the city of Izmir, located in the Aegean coast of Turkey. Methods: A questionnaire and the validated International Consultation on Incontinence Questionnaire-Short Form (ICIQ-SF) were filled by urologists (O.D., V.S., A.E., O.B., and B.I.) with face-to-face interview. The participants with urge UI (UUI) and stress UI (SUI) were compared in terms of risk factors, quality of life (QoL) scores, severity of incontinence, status of doctor consultation, and total ICIQ-SF scores. Results: A total of 719 women were included and the prevalence of UI was 50.3% in our study. The key risk factors for UUI were hypertension and diabetes mellitus; the key risk factors for SUI were hypertension, multiparity, body mass index, and lower education level. Average QoL (ICIQ-SF 5) score for UUI was worse than SUI (3.8 ± 2.5 vs. 3.3 ± 2.4; p = 0.042) and seeking treatment for UI was significantly higher in participants with UUI when compared to those with SUI (45.1 vs. 24%; p ≤ 0.001). Conclusions: Physicians should be aware that risk factors may differ according to specific UI subtypes when evaluating patients with UI.
Türk Üroloji Dergisi/Turkish Journal of Urology | 2017
Deniz Bolat; Ozgu Aydogdu; Salih Polat; Serkan Yarimoglu; Ibrahim Halil Bozkurt; Tarik Yonguc; Volkan Sen
OBJECTIVE We investigated the prognostic value of preoperative neutrophil-to-lymphocyte ratio (NLR) on germ cell testicular tumors (GCT). MATERIAL AND METHODS The data of 53 patients who underwent inguinal orchiectomy were analyzed retrospectively. NLR was calculated from the preoperative complete blood cell counts. Receiver operating characteristic (ROC) analysis was performed to find the threshold values for NLR. Correlations between cancer-specific survival (CSS) and progression-free survival (PFS) and NLR were evaluated. RESULTS The mean follow-up time was 23.55±18.06 months. The mean level of NLR was 3.08±1.81. Optimal threshold values of NLR was calculated as 3.55 for PFS (area under curve, AUC: 0.55) and 3.0 for CSS (AUC: 0.66). For patients with a NLR of <3.55 and NLR of ≥3.55, mean times-to-progression were 55.71 months (95% CI, 51.27-60.14) and 51.95 months (95% CI, 38.02-65.87, p=0.152), respectively. As well as, for patients with a NLR of <3.0 and NLR of ≥3.0, mean times-to-cancer specific death were 54.72 months (95% CI, 49.05-60.38) and 49.43 months (95% CI, 37.64-61.22, p=0.119), respectively. CONCLUSION Preoperative NLR is not a useful tool to predict the prognosis of patients with GCT.
Kaohsiung Journal of Medical Sciences | 2016
Bulent Gunlusoy; Yasin Ceylan; Tansu Degirmenci; Ozgu Aydogdu; Ibrahim Halil Bozkurt; Tarik Yonguc; Volkan Sen; Zafer Kozacıoğlu
We aimed to evaluate the potential effect of age on the natural behavior of bladder cancer and to compare these findings between different age groups. The clinical and pathologic data of 239 patients treated at our institution between 1994 and 2014 were analyzed. The patients were classified into three groups according to age: ≤ 40 years (Group 1), 41–59 years (Group 2), and ≥ 60 years (Group 3). The following data were collected: characteristics of the patients, initial pathological findings after transurethral resection, tumor stage and grade, tumor size and multiplicity, and disease recurrence and progression. The mean age of the patients at initial diagnosis was 34.2 ± 5.5 years, 53 ± 5.1 years, and 71.1 ± 7 years in Groups 1, 2, and 3, respectively. There were 207 (86.6%) patients with nonmuscle‐invasive urothelial bladder cancer and 32 (13.4%) patients with muscle‐invasive disease. Tumor recurrence was significantly lower in Group 1 than in Group 2 (p = 0.001) and Group 3 (p = 0.001). Although the time to tumor recurrence was significantly different between the three groups (p = 0.001), no significant difference was noted in the time to progression (p = 0.349). Patients with urothelial cancer younger than 40 years tend to have single and small tumors. The tumor recurrence rate is lower in the younger age group, but tumor progression is similar in older and younger patients. Therefore, the findings indicate that clinicians should be careful when assessing the invasiveness of urothelial tumors in younger patients and start treatment as soon as possible.