Guido Fechner

University of Bonn, Bonn, North Rhine-Westphalia, Germany

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Publications (45)82.9 Total impact

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    ABSTRACT: We evaluated the success rate of continent vesicostomy using an ileal segment with seroserosally embedded, tapered ileum for bladder augmentation with continent stoma following bladder neck closure (BNC) for severely damaged bladders or persistent urinary incontinence. A total of 15 patients were treated for persistent urinary incontinence or non-reconstructible bladder outlet between 2003 and 2012. Underlying diagnosis included post-prostatectomy incontinence (n = 5), recurrent bladder neck stenosis (n = 5), neurogenic bladder (n = 3), urethral tumor recurrence following orthotopic neobladder (n = 1) and post-TVT and colposuspension incontinence (n = 1). All patients underwent open BNC, omental interposition and continent vesicoileostomy. The continent outlet was placed in the lower abdomen using a circumferential subcutaneous and skin plasty to avoid retraction. Data collected included age, underlying diagnosis, stoma site, time to complications and need for subsequent surgical revisions. All patients received a standardized questionnaire at the time of data acquisition and were personally interviewed. Median follow-up was 24 months (range: 2-111). Primary BNC was successful in all patients and primary continence rate was 86.7%. Two patients (13.3%) suffered from failure of the continence mechanism, caused by stoma stenosis at skin level and insufficiency of the bladder augmentation and stoma due to local infection. One additional patient developed a mild stomal incontinence without need for further reconstruction. Regardless of the number of revisions, at the last follow-up 93.3% of patients had a functional channel. All complications occurred within the first postoperative year. This technique is an effective last resort treatment for patients with non-reconstructible bladder outlet.
    Central European journal of urology. 01/2014; 66(4):481-6.
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    ABSTRACT: Purpose: To evaluate individually tailored open nephron-sparing surgical techniques for urothelial carcinoma of the pyelocalyceal system (UCPCS). Materials and Methods: Four patients underwent nephron-sparing surgery for UCPCS including, open partial resection of the pyelon with peritoneal reconstruction, partial nephrectomy, open partial resection of the pyelon with kidney autotransplantation, combined open resection and calicoscopic laser coagulation. Results: Recurrence-free survival was 24 months without any impairment of kidney function in all patients. Conclusion: Open nephron-sparing surgery for UCPCS should be taken into consideration for selected cases.
    Urology journal 01/2014; 11(2):1442-6. · 0.56 Impact Factor
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    ABSTRACT: Aim: No reliable biomarker for renal cell carcinoma (RCC) exists. The purpose of this study was to analyze the value of CpG island hypermethylation of cell-free (cf) circulating serum DNA in patients with RCC as a potential biomarker. In total 35 patients with RCC and 54 healthy individuals were enrolled in this study. Cell-free DNA (cFDNA) in serum was isolated and digested with methylation-sensitive restriction enzymes (Bsh1236I, HpaII and HinP1I) to quantify the amount of methylated Adenomatosis-poliposis-coli gene (APC), Gluthation-a-transferase-protein 1 gene (GSTP1), ARF tumor suppressor protein gene (p14(ARF)), cyclin-dependent kinase inhibitor 2A (p16), Retinoid-acid-receptor-beta gene (RAR-B), RAS-association domain family-1 gene (RASSF1), Tissue inhibitor of metalloproteinase-gene (TIMP3) and Prostaglandin-endoperoxid synthase 2 (PTGS2) DNA fragments. In 30 of 35 investigated patients with RCC, at least one gene was methylated within the serum cfDNA. The methylation frequency ranged from 14.3% for p14(ARF) to 54.3% for APC. All genes, except p16 and TIMP3, were significantly more frequently methylated in patients with RCC compared to healthy individuals. Receiver operator characteristic analysis showed a high specificity for serum cfDNA methylation [between 85.2% for RAR-B and 100% for p14(ARF)], but the sensitivity was low in single-gene analysis [range-14.3% for p14(ARF) to 54.3% for APC]. The combined analysis of multiple genes increased the diagnostic sensitivity (i.e. APC, PTGS2 and GSTP1, 62.9%) at a high specificity (87%). DNA hypermethylation of APC was correlated with advanced tumor stage. The detection of hypermethylated cfDNA in serum may be helpful for the identification of RCC; the combinatorial analysis of multiple genes may increase the diagnostic accuracy.
    Anticancer research 10/2013; 33(10):4651-4656. · 1.71 Impact Factor
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    ABSTRACT: Introduction: To evaluate the meaning of urodynamic parameters in patients with pouch incontinence. Materials and Methods: Thirteen urodynamic studies in patients with an ileal nipple as the efferent segment of an ileocecal pouch or ileum/ileocecal-augmented bladder were performed. The recorded parameters included pouch capacity, leak point pressure/volume, maximum pouch pressure, compliance, static and dynamic closure pressure, and functional length. Three patients suffered from urinary incontinence. Results: In all cases of incontinent patients, no functional length or static or dynamic closure pressure could be revealed. In 8 of 10 cases of continent patients, a positive functional length as well as static and/or dynamic closure pressure were measured (mean value in continent patients: 15.9 mm, 14.5 cm H2O and 26.5 cm H2O, respectively). In 2 of 3 cases of incontinent patients, the pouch compliance was restricted (21 and 37 ml/cm H2O). The pouch capacity of continent patients was greater than the capacity of incontinent patients (377.4 vs. 185.7 ml). Conclusions: Positive functional length, static and dynamic closure pressures, and a high pouch capacity with an unrestricted compliance are predictive for pouch continence. They may individually not determine continence, but combining them can. However, the meaning of urodynamic studies in pouch incontinence is not the same as with the urinary bladder. © 2013 S. Karger AG, Basel.
    Urologia Internationalis 09/2013; · 1.07 Impact Factor
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    ABSTRACT: BACKGROUND: Cell-free serum DNA levels are increased in patients with cancer, and at least partially, these DNA fragments are derived from cancer cells. A few reports indicated that methylated serum DNA in patients with bladder cancer (BCA) is a useful non-invasive biomarker. The purpose of this prospective multicenter study was to validate earlier studies. MATERIALS AND METHODS: In total, 227 consecutive participants (non-muscle invasive BCA, n=75; muscle-invasive BCA, n=20; transurethral bladder resection (TURB) without BCA, n=48; benign disease, n=31; healthy individuals, n=53), were recruited for this study. Cell-free serum DNA was isolated and digested with methylation-sensitive restriction-enzymes (Bsh1236I, HpaII and HinP1I) to quantify the amount of methylated (TIMP3, APC, RARB, TIG1, GSTP1, p14, p16, PTGS2 and RASSF1A) DNA fragments. RESULTS: The amount of methylated DNA was usually small (<10%), and the methylation frequencies varied for different genes (e.g. frequent: TIMP3; moderate: APC, RARB, TIG1; infrequent: p16, PTGS2, p14, RASSF1A, GSTP1). Methylation levels at each gene site and the number of methylated genes were increased in BCA compared to healthy individuals, but were similar in BCA and patients with non-malignant disease. The number of methylated genes allowed for discrimination (62% sensitivity, 89% specificity) of BCA patients from healthy individuals. DNA hypermethylation was not correlated with advanced stage or grade in patients with BCA. CONCLUSION: The detection of hypermethylated DNA in serum allows for discrimination of patients with BCA and healthy individuals, but there is no difference between patients with BCA and those with non-malignant disease, thereby limiting its value as a non-invasive biomarker.
    Anticancer research 03/2013; 33(3):779-784. · 1.71 Impact Factor
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    ABSTRACT: The spindle cell rhabdomyosarcoma is a rare variant of the embryonal rhabdomyosarcoma, mostly occurring in childhood. Only a few cases are described in adults. To date, no case of the spindle cell subtype of the prostatic embryonal rhabdomyosarcoma has been published. We report on a 23-year-old man, initially presenting with obstructive micturition problems, perineal pain and night sweat. After diagnosis by transrectal biopsy of the prostate, radiochemotherapy within the CWS 2002 P study was applied: nine cycles of vincristine, doxorubicin, actinomycin D, ifosfamide, and fractionated radiotherapy of the tumor and suspect lymph nodes (final dose 50.4 Gy). The tumor initially shrank, but an early local recurrence arose. Second-line chemotherapy was applied, followed by a salvage radical cytoprostatectomy. The patient died of disseminated disease 14 months after diagnosis.
    International Journal of Urology 01/2013; · 1.73 Impact Factor
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    ABSTRACT: PURPOSE: To determine retrospectively the perioperative management and outcome of transurethral prostate/bladder surgery (TURP, TURB) and transrectal prostate biopsy in hemophiliacs. METHODS: Thirty-seven hemophilic patients underwent TURP (12 patients), TURB (13 patients), or transrectal prostate biopsy (12 patients) with proactive hemostaseological management (i.e., factor supply, close meshed hemostaseological analysis). Thirty-seven non-hemophiliac patients served as matched pairs who matched for age, gender, accompanying diseases, and the type of surgical procedure. The resulting pairs were analyzed for duration of surgery, hospital stay, and complications. RESULTS: Average TURP length in hemophiliacs was 77.92 min, in the matched pairs group TURP 67.08 min (p = 0.487). Mean TURB length in hemophiliacs was 43.46 min versus 35.38 min in controls (p = 0.678). More important, the length of hospital stay was significant longer in the hemophiliacs undergoing TURP compared to non-hemophiliac control group (12.08 days vs. 5.83 days; p < 0.001). In TURB patients, similar results were found (11.15 days hemophiliacs vs. 6.15 controls; p = 0.018). Regarding complications (bleeding, hemorrhage, readmission), no significant difference between the groups was obtained. CONCLUSION: Urological interventions in hemophiliac patients with factor supply have the same risk for postoperative complications as in non-hemophiliacs. The only significant difference between hemophiliacs and non-hemophiliacs was the length of hospital stay.
    World Journal of Urology 11/2012; · 2.89 Impact Factor
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    ABSTRACT: Cell-free DNA may serve as a biomarker for patients with cancer; we designed our study to determine its potential in patients with bladder cancer (BCA). Short β-actin (ACTB)-106 and large ACTB-384 fragments were quantified using real time PCR (RT-PCR); the ratio of ACTB-384/ACTB-106 was defined as DNA integrity. We analyzed the serum from 95 patients with and from 132 without BCA. Patients with BCA had increased ACTB-106 levels and lower DNA integrity compared to patients without cancer. However, patients undergoing transurethral bladder resection (TURB) with histological exclusion of BCA had a similar ACTB-106 level and DNA integrity, as patients with BCA. Cell-free DNA was not correlated with smoker status, pT stage, grade or lymph node metastasis, or DNA integrity. There was a weak inverse correlation of age with DNA integrity in patients with BCA. Analysis of serum cell-free DNA levels and fragmentation patterns are of limited value regarding the identification of patients with BCA.
    Anticancer research 08/2012; 32(8):3119-24. · 1.71 Impact Factor
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    ABSTRACT: To evaluate surgical complications and functional results of deceased-donor renal transplantations (DDRT) in a small centre dependent on the surgeons level of experience and to derive a leaning-curve model for DDRT. Three hundred and ninety-two recipients underwent DDRT at the Department of Urology, Bonn University. Operative procedures were performed by 18 various urological surgeons grouped in 5 levels of experience (LOE). Perioperative data, complications and graft survival after 12 months were recorded depending on LOEs. Operative time and warm ischaemia time significantly decreased after an experience of 40 DDRT. Complication rates and graft function after 12 months did not differ between all LOEs. Kidney transplantation in a small centre is a safe and effective procedure even if performed by surgeons under education. As a crucial finding, a surgeon climbing his learning curve becomes faster but not necessarily better.
    International Urology and Nephrology 07/2012; 44(5):1411-5. · 1.33 Impact Factor
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    ABSTRACT: BACKGROUND: German residents are becoming increasingly more discontent with their situation. Besides unfriendly working hours and growing bureaucracy the lack of surgical education is considered as causative. Surgical education is assumed to be time-consuming and might impair operative results. Moreover, a number of patients refuse to be misused as a teaching tool. AIM OF THE STUDY: The aim of this study was to compare operative procedures (transurethral resection of the prostate) performed by residents and consultants. PATIENTS AND METHODS: All patients underwent monopolar transurethral electroresection of the prostate for symptomatic benign enlargement. All data were collected retrospectively. Mean follow-up to collect functional results and late complications was 70 months. RESULTS: Both groups did not differ significantly in perioperative and postoperative results except for the weight of resected tissue in favor of the consultants group. Functional results and late complications were comparable in both groups. CONCLUSIONS: Transurethral resection of the prostate performed by residents is a safe and effective procedure.
    Der Urologe 07/2012; · 0.46 Impact Factor
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    ABSTRACT: In a retrospective multicenter study of four clinics perioperative complications as well as incontinence and stoma stenosis of serosa-lined tapered ileum as catheterizable continence mechanisms for different urinary diversions were analyzed. Between 2008 and 2012 a total of 40 patients received a continent catheterizablestoma, 15 (37.5%) in combination with continent vesicostomy and closure of the bladder neck due to postoperative incontinence and recurrent stenosis including radical prostatectomy, transurethral resection (TUR) of the prostate, bladder neck incision (n=11), neurogenic bladder with reduced capacity and incontinence (n=2), interstitial cystitis (n=1) and recurrent urethral tumor following ileal neobladder (n=1). Of the patients 25 (62.5%) received this continence mechanism in combination with a modified Mainz pouch I, in 19 patients as primary and in 6 patients as secondary efferent segment for trouble shooting. The complications were subdivided according the Clavien classification. In 29 patients information concerning continence and stenosis were obtained, the median follow-up was 25 months (range 1-111 months). In patients with continent vesicostomy (n=11) the incontinence rate was 9.1% (1/11) and the stenosis rate 18.2% (2/11). In 18 patients with an ileocecal pouch, incontinence and stenosis rates were 0% and 11.1% (2/18), respectively. The presented technique is a safe continence mechanism for various catheterizable continent urinary diversions for both primary and secondary indications.
    Der Urologe 07/2012; 51(7):947-55. · 0.46 Impact Factor
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    ABSTRACT: In einer retrospektiven Multicenterstudie an vier Kliniken wurden die perioperativen Komplikationen sowie Inkontinenz- und Stomastenoseraten von getapertem, seroserös eingebettetem Ileum als katheterisierbarer Kontinenzmechanismus für verschiedene Harnableitungsreservoire erfasst. Zwischen 2008 und 2012 erhielten 40 Patienten ein solches katheterisierbares Stoma, 15 (37,5%) davon als kontinente Vesikostomie mit Blasenhalsverschluss wegen postoperativer Inkontinenz/Rezidivblasenhalsenge (radikale Prostatektomie, TUR-Prostata, Blasenhalsinzision, n=11), neurogener Blasenentleerungsstörung mit reduzierter Blasenkapazität und Inkontinenz (n=2), reduzierter Blasenkapazität bei interstitieller Zystitis (n=1) und urethralem Tumorrezidiv nach Ileumneoblase (n=1). Bei 25 (62,5%) Patienten wurde der Kontinenzmechanismus bei einem modifizierten Mainz-Pouch I angelegt, davon in 19 Fällen primär und bei 6 Patienten sekundär als „trouble shooting“. Komplikationen wurden entsprechend der Clavien-Klassifikation beurteilt. Insgesamt konnten 29 Patienten hinsichtlich der Kontinenz bzw. Stenosebildung postoperativ nachuntersucht werden, die mediane Nachbeobachtungszeit betrug 25 (1–111) Monate. Bei 1 von 11 Patienten mit kontinenter Vesikostomie trat eine Inkontinenz auf (9,1%), bei 2 von 11 Patienten eine Stenose (18,2%). Bei 18 Patienten mit Ileozäkalpouch lag die Inkontinenzrate bei 0%, die Stenoserate bei 11,1% (2/18). Die vorgestellte Technik stellt ein zuverlässiges und komplikationsarmes Verfahren einer katheterisierbaren kontinenten Harnableitung dar, die primär und sekundär angewandt werden kann.
    Der Urologe 07/2012; 51(7). · 0.46 Impact Factor
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    ABSTRACT: To evaluate the feasibility and safety of thulium:yttrium-aluminium-garnet laser vapoenucleation of the prostate (ThuVEP) in patients with chronic anticoagulation and bleeding disorders. We retrospectively analyzed the clinical data (transfusion rate, hemoglobin changes, residual urine, bleeding complications, complications and residual urine) of patients with chronic anticoagulation and bleeding disorders treated with ThuVEP. Anticoagulation was not paused for surgery. We identified 39 patients who fulfilled the inclusion criteria (32 with chronic anticoagulation, 3 with bleeding disorder, and 4 with both). Mean preoperative hemoglobin was 12.9 g/l; the postoperative hemoglobin was 11.7 g/l. One patient received a blood transfusion. Mean residual urine was 166 ml preoperatively and 47 ml postoperatively, respectively; spontaneous voiding postoperatively was feasible in 36 patients. During follow-up, 5 patients suffered from gross hematuria, which was treated conservatively. ThuVEP is a safe procedure in patients with therapeutic anticoagulation, bleeding disorders and platelet aggregation inhibitor medication.
    Urologia Internationalis 05/2012; 88(4):390-4. · 1.07 Impact Factor
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    ABSTRACT: •To determine the role of global histone methylation as a prognostic parameter in patients with bladder cancer. •We used a tissue microarray with samples from patients with non-muscle-invasive bladder cancer (NMIBC; n= 161), muscle-invasive bladder cancer (MIBC, n= 127), normal urothelium (NU; n= 31) and bladder cancer metastases (METS; n= 31) to determine global histone methylation (me) levels at histone H3 lysine 4 (H3K4) and H4K20. •Global histone modification levels (H3K4me1, H3K4me3, H4K20me1, H4K20me2, and H4K20me3) were lower in bladder cancer samples than in NU tissue •Global levels of H3K4me1, H4K20me1, H4K20me2 and H4K20me3 were decreasing from NU over NMIBC and MIBC to METS. •H4K20me1 levels were increased in patients with NMIBC with advanced pTstage and less differentiated bladder cancer. •In patients with MIBC, pTstage was negatively correlated with H3K4me1, H4K20me1 and H4K20me2 levels. •H4K20me3 levels were significantly correlated in a univariate and multivariate model with bladder cancer-specific mortality after radical cystectomy in patients with MIBC. •Global histone methylation levels may help to identify patients with bladder cancer with poor prognosis after radical cystectomy.
    BJU International 05/2011; 108(8 Pt 2):E290-6. · 3.05 Impact Factor
  • G Fechner
    Aktuelle Urologie 05/2011; 42(3):197-213. · 0.47 Impact Factor
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    ABSTRACT: The second-line chemotherapeutic treatment for metastatic urothelial cancer (UC) after failure of cisplatin-based first-line therapy needs to be improved. Based on encouraging phase II data of gemcitabine and paclitaxel (Taxol) (GP), this trial was designed to compare a short-term (arm A) versus a prolonged (arm B) second-line combination chemotherapy of GP. Of 102 randomized patients, 96 were eligible for analysis. Primary end point was overall survival (OS). Secondary end points were progression-free survival (PFS), objective response rates (ORR) and toxicity. Neither OS [arm A: 7.8 (95% CI: 4.2-11.4), arm B: 8.0 (95% CI: 4.9-11.1) months] and PFS [arm A: 4.0 (95% CI: 0-8.0), arm B: 3.1 (95% CI: 1.9-4.2) months] nor ORR (arm A: 37.5%, arm B: 41.5%) were significantly different. On prolonged treatment, more patients experienced severe anemia (arm A: 6.7% versus arm B: 26.7% grade III/IV anemia; P = 0.011). In six patients, treatment was stopped during the first cycle due to disease progression or toxicity. Two patients died due to treatment-related toxic effects. Due to rapid tumor progression and toxicity at this dosage and schedule in a multicenter setting, it was not feasible to deliver a prolonged regimen. However, a high response rate of ∼40% makes GP a promising second-line treatment option for patients with metastatic UC.
    Annals of Oncology 02/2011; 22(2):288-94. · 7.38 Impact Factor
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    ABSTRACT: A sufficient and easily catheterizable continence mechanism is essential in continent cutaneous pouches. Kälble embedded a tapered ileum as efferent segment into a serosal lined tunnel formed by an ileal 'U' according to the principle of Abol-Enein and Ghoneim. We report a modified technique applied in a series of 12 patients who had undergone different urinary diversions. All patients received a modified Kälble procedure (first-line urinary diversion, n = 8; revision/undiversion, n = 4) for different forms of continent pouches. To alleviate embedding of the efferent segment, ileal detubularization was performed asymmetrically. Mean follow-up was 9.5 months. All patients were continent and performed self-catheterization easily. Of 12 patients, 2 underwent endoscopic incision for stomal stenosis 8 and 12 months postoperatively. Subject to our short follow-up, Kälble's technique is a promising alternative in patients undergoing a continent cutaneous urinary diversion but offers an inapplicable or missing appendix.
    Urologia Internationalis 01/2011; 86(3):269-72. · 1.07 Impact Factor
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    ABSTRACT: To analyse the diagnostic and prognostic value of cell-free DNA in patients with renal cell carcinoma (RCC). Cell-free DNA was measured in 35 patients with RCC and 54 healthy individuals using quantitative real-time PCR. ACTB-106 detects fragmented cell-free DNA due to apoptosis and ACTB-384 detects long DNA fragments by necrosis. DNA-Integrity (ACTB-384/ACTB-106 ratio) served as measure of DNA fragmentation. Levels of both DNA fragments were increased in RCC patients compared to healthy individuals (ACTB-384: 1.77 vs. 0.61ng/ml, p=0.0003; ACTB-106: 1.31ng/ml vs. 0.77 ng/ml p=0.003). Receiver operator characteristic analysis (ROC) showed at a threshold level of 1.03 ng/ml for ACTB-106 68.6%, sensitivity and 70.4% specificity (AUC: 0.69). ROC analysis showed at a threshold level of 1.70 ng/ml for ACTB-384 57.1%, sensitivity and 81.5% specificity (AUC: 0.73). DNA integrity was increased in RCC (1.07 vs. 0.72 p=0.04). In vascular invasion the DNA integrity was reduced (p=0.003). Cell-free-DNA levels are increased in RCC. The DNA integrity indicates mostly necrotic origin in RCC.
    Anticancer research 07/2010; 30(7):2785-9. · 1.71 Impact Factor
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    ABSTRACT: There is no technique which can be used in all types and localizations of urethral strictures. Urethral strictures occur in the majority of cases in the bulbar urethra. The success rate of urethroplasty is above 80% and results are much better compared to DVIU. Dorsal onlay shows a significantly better success rate than ventral onlay. If the graft bed has poor vascularization a flap should be used or a staged approach should be considered.
    Der Urologe 06/2010; 49(6):727-30. · 0.46 Impact Factor
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    ABSTRACT: Es existiert keine Technik der Harnröhrenrekonstruktion, die allen Strikturtypen und Lokalisationen gerecht wird. Die bulbäre Harnröhre ist am häufigsten betroffen. Im Vergleich zur Urethrotomie sind die Erfolgsraten der plastischen Rekonstruktion mit >80% deutlich besser. Die dorsale Urethroplastie ist der ventralen signifikant überlegen. Bei schlechten Vorrausetzungen für einen freien Graft (tubulärer Ersatz notwendig, schlecht durchblutetes Gewebe) kommen gestielte Penishautlappen oder zweizeitige Verfahren in Frage. There is no technique which can be used in all types and localizations of urethral strictures. Urethral strictures occur in the majority of cases in the bulbar urethra. The success rate of urethroplasty is above 80% and results are much better compared to DVIU. Dorsal onlay shows a significantly better success rate than ventral onlay. If the graft bed has poor vascularization a flap should be used or a staged approach should be considered. SchlüsselwörterPlastische Rekonstruktion-Harnröhrenrekonstruktion-Urethroplastie KeywordsReconstructive plastic surgery-Urethral reconstructive surgery-Urethroplasty
    Der Urologe 01/2010; 49(6):727-730. · 0.46 Impact Factor

Publication Stats

220 Citations
82.90 Total Impact Points

Institutions

  • 2003–2013
    • University of Bonn
      • Klinik und Poliklinik für Urologie und Kinderurologie
      Bonn, North Rhine-Westphalia, Germany
  • 2009
    • Sigmund-Freud-Institut
      Frankfurt, Hesse, Germany