Petros Perimenis

Ureteral Metal Stents: 10-Year Experience With Malignant Ureteral Obstruction Treatment

PURPOSE Ureteral patency in malignant ureteral obstruction cases is a therapeutic challenge. We report our long-term experience with palliative treatment for extrinsic malignant ureteral obstruction with percutaneous placement of metal mesh stents. MATERIALS AND METHODS From January 1996 to December 2005, 90 patients with a mean age of 59 years (range 35 to 80) with ureteral obstruction due to extrinsic ureteral compression and/or encasement by primary or metastatic tumors, or retroperitoneal lymphadenopathy underwent implantation of self-expandable metal mesh stents. A total of 119 ureters were managed. Followup included urinalysis, blood biochemistry tests and transabdominal ultrasound or intravenous urography. RESULTS The technical success rate of percutaneous antegrade insertion of ureteral self-expandable metal mesh stents was 100%. Renal biochemistry normalized and hydronephrosis gradually resolved 1 to 2 weeks after stent insertion. Median followup was 15 months (range 8 to 38). Hyperplastic reaction and/or encrustation, or tumor ingrowth developed in 45 stents. Secondary intervention, such as repeat balloon dilation and coaxial stenting, was done to improve patency. Migration was observed in 13 metal stents. The primary and secondary patency rates during followup were 51.2% and 62.1%, respectively. A double pigtail or external-internal stent was inserted in 45 cases in which secondary interventions did not ensure patency. CONCLUSIONS Internal drainage of extrinsic malignant ureteral obstruction with metal mesh stents provides long-term decompression of the upper urinary tract in select cases. Certain problems limit the application of metal mesh stents in the ureter. Further studies are warranted to identify independent predictors of ureteral patency after the application of metal stents for malignant obstruction.

Externally coated ureteral metallic stents: an unfavorable clinical experience.

Abstract Objective: The purpose of the present study was to evaluate the use of externally coated stents in patients with malignant ureteral obstruction. Materials and Methods: We have prospectively evaluated 16 patients, 10 men and 6 women, with malignant ureteral obstruction treated successfully by placement of Passager metal stents (Boston Scientific, Natick, MA, USA) bypassing the stricture. Mean patient age was 65.6 years (range 62–78 years). Ureteral patency was confirmed 24 and 48 hours by injection of contrast material through the nephrostomy tube, and after patency confirmation the nephrostomy catheter was removed. Results: All stents were positioned successfully, and the postoperative course was uneventful. In 13 cases (81.2%) the prostheses finally migrated into the bladder hindering overall ureteral patency (mean time of migration: 1.5 months). Patency was achieved in the remaining ureters ( n =3), during the follow-up period (mean: 8 months, range 6–16 months), without any need for further intervention. Conclusion: The inappropriate anchorage and the increased ureteral peristalsis are the main causes of migration towards the bladder, thus, minimizing the usefulness of this stent for the treatment of ureteral strictures.

Fournier’s Gangrene, a Urologic and Surgical Emergency: Presentation of a Multi-Institutional Experience with 45 Cases

Objective: To review multi-institutional, multidisciplinary experience in the management of Fournier’s gangrene (FG) in an attempt to identify etiologic parameters as well as to propose methods of efficient management. Patients and Methods: Retrospective chart review of 45 patients diagnosed with FG and treated in three departments (general surgery and urology departments) was performed. Results: Average patient age was 50 ± 15.8 (range 33–81) years. Five female and 40 male patients. Seven patients deceased due to the disease. In 26 and 6 cases, perianal or ischiorectal abscess was present, respectively. These abscesses were extending up to the level of rectovesical/Douglas pouch in 12 cases. Abscesses in the scrotum and perineum were revealed in 10 and 6 cases, respectively. A fistula to the rectum and 8 sinuses to the skin were observed. Colostomy was performed in 25 cases, diverting cystostomy in 17, and orchidectomy in 12 cases. In 18 patients (40%) repeat debridement was deemed necessary. Three patients required more than 3 debridement procedures. Average hospitalization time was 15.7 ± 11.6 (range 4–40) days. Conclusion: FG is a life-threatening form of necrotizing soft tissue infection. The disease is unpredictable and the currently proposed methods for prognosis are promising but still questionable.

Switching from long-term treatment with self-injections to oral sildenafil in diabetic patients with severe erectile dysfunction.

OBJECTIVE To assess the efficacy of oral sildenafil in diabetic men with severe erectile dysfunction (ED), who are successfully treated with intracavernous injections of vasoactive drugs. METHODS 81 impotent diabetic men (29 with type 1 and 52 with type 2) were treated for 1-7 years with self-injections. 13 men were treated with 10 microg and 15 with 20 microg of prostaglandin E1 (PGE1), and 53 with a mixture of PGE1 20 microg and papaverine 7.5-40 mg (MIX). After a 1-week washout period, they changed to oral sildenafil in titrating doses up to 100mg. The change was successful if the man achieved an erection and penetration even once. RESULTS Sildenafil was discontinued in 23 men because of insufficiency. Eleven men (13.6%), all with type 2 diabetes, responded to sildenafil (10 previously treated with 10 microg and 1 with 20 microg of PGE1, none treated with MIX). Thus, 39.2% of the treated with PGE1 responded to oral sildenafil. The response was influenced by the age, the type of diabetes (type 2) and the kind of the previously injected drug (PGE1 10 microg); it was not influenced by the duration of diabetes, ED and treatment with self-injections. CONCLUSIONS Despite the well documented efficacy of sildenafil, self-injections continue to be the solely effective therapeutic modality in many diabetic men afflicted by severe ED. Only the younger men with non-insulin-dependent diabetes, treated with low doses of PGE1 are more likely to respond to oral sildenafil and change treatment. Men with insulin-dependent diabetes or treated with mixtures of vasoactive drugs are not likely to respond to oral sildenafil.

Erectile dysfunction in men with obstructive sleep apnea syndrome: a randomized study of the efficacy of sildenafil and continuous positive airway pressure

The aim of this study was to compare the efficacy of sildenafil and continuous positive airway pressure (CPAP) in men with erectile dysfunction (ED) and obstructive sleep apnea syndrome (OSAS). In all, 30 men were randomly treated for 12 weeks either with sildenafil 100 mg before intercourse (15 men) or CPAP during night time sleep (15 men). Under sildenafil, 97/180 (53.9%) of attempted intercourses were successful compared to 33/138 (23.9%) under CPAP. The mean IIEF (erectile function domain score) was 12.9 and 9.3 after sildenafil and CPAP treatment, respectively (P=0.007), compared to 7.9 and 7 at baseline. In all, 53.3% of patients were satisfied with sildenafil and 20% with CPAP for ED treatment (P=0.058). Although sildenafil was superior to CPAP, comorbidities and OSAS per se possibly resulted in a lower effectiveness of sildenafil compared to that in the general population of ED men. While about half of the patients were not satisfied even with the more effective treatment, we conclude that a combination of the two therapeutic tools or a different therapeutic mode should be studied further.

Percutaneous minimally invasive management of iatrogenic ureteral injuries.

PURPOSE To present experience with the percutaneous management of iatrogenic ureteral injuries. PATIENTS AND METHODS Eighteen women and six men with a mean age of 59.3 years (range 33-80 years) received a diagnosis of ureteral injury sustained during gynecologic, urologic, and general surgical procedures. In a total of 25 injured ureters, 12 had interruption of continuity of their lumen, 10 were associated with contrast extravasation, and 3 were related to both. A standard percutaneous nephrostomy tract was established on the side of the afflicted kidney. Combined use of hydrophilic guidewires and balloon dilations were performed to achieve antegrade recanalization of the ureteral lesion. Then, a ureteral stent was inserted to assure patency. RESULTS Average stricture length was 1.21 (range 0.5-1.9 cm). Success of the aforementioned technique was possible in 18 ureters. Successful management in one session took place in 14 ureters. Average hospitalization time was 1.8 days (range 0-5 d). The follow-up period ranged between 12 and 18 months, with mean follow-up time of 12.9 months. Ureteral patency was evident at 1 week follow-up in six patients with obstructed ureters. In the remaining patients, balloon dilation of the stricture was repeated, and another stent was placed. Extravasation of contrast was observed in two patients with extravasating ureters in the same period. Nephrostomy tubes were removed after a mean indwelling period of 5.9 weeks (range 1-12 wks). Two patients treated by the described method died during their hospitalization in the intensive care unit because of sepsis from peritonitis that was related to colon injury and multiple concomitant injuries. Major complications were not observed in the remaining 22 patients during the follow-up period. CONCLUSION The minimally invasive management of ureteral injuries is a safe and efficient method for both ureteral obstruction and/or laceration in a wide range of iatrogenic ureteral injuries.

A comparative, crossover study of the efficacy and safety of sildenafil and apomorphine in men with evidence of arteriogenic erectile dysfunction

The aim of the study was to establish and compare the efficacy and safety of sildenafil and apomorphine in men with arteriogenic erectile dysfunction (ED). In all, 43 men with ED and postinjection max penile systolic velocity <25 cm/s in repeated Doppler ultrasonography were included. Of these, 24 men started on apomorphine 2 mg and 19 on sildenafil 50 mg, the doses titrated up to 3 and 100 mg according to effectiveness and tolerability. Safety was evaluated according to adverse events (AEs) and patient withdrawal. Efficacy was the percentage of attempts resulting in erections firm enough for intercourse, based on event log data. The incidence of AEs with apomorphine 3 mg was higher than with sildenafil 100 mg. Two men on apomorphine 3 mg discontinued treatment due to AEs. The overall success rate of sildenafil was 63.7% compared to 32.1% of apomorphine (Pearson χ2, P<0.01). Of all men, 25 (58.1%) responded to sildenafil 50 mg without the need for dose increase, while only one responded to apomorphine 2 mg. The response to sildenafil 50 mg was age related (analysis of variance, p=0.04). Satisfaction was reported by 76.75 and 13.95% of patients for sildenafil and apomorphine, respectively, but 20.9% were not satisfied with any of the two drugs. In conclusion, this study provides clear evidence that sildenafil, even at 50 mg dose, is more effective than apomorphine 3 mg in men with arteriogenic ED. The fact that one out of five patients is not satisfied with the above-studied drugs shows that new oral agents need to be evaluated for the treatment of this disorder.

Percutaneous Management of Staghorn Calculi in Horseshoe Kidneys: A Multi-Institutional Experience

BACKGROUND AND PURPOSE Percutaneous nephrolithotomy (PNL) is a first-line management technique for staghorn stones and stones located in a horseshoe kidney (HK). We present our multi-institutional experience on the management of staghorn calculi within HKs. MATERIALS AND METHODS The study included 15 patients with 17 staghorn calculi in HKs who were treated by PNL in six academic institutions. All PNL procedures were performed in a standard one-session technique with fluoroscopic guidance. The following information was assessed: Number of access dilations, renal access location, blood loss, blood transfusion, stone-free rate, length of hospitalization. Intraoperative and postoperative complications as well as secondary procedures (second-look PNL, ureteroscopy, and shockwave lithotripsy) were reviewed. RESULTS Mean patient age was 50 years (range 24-72 y) years old. Subcostal (n = 16) or intercostal (n = 1) puncture was performed. The average anesthesia time was 126 minutes (93-200 min). The average blood loss was 450 mL, and transfusions were deemed necessary in 20% of the cases. Single skin incisions were made for the management of 11 renal units, and multiple incisions were made in 6. The average number of tract dilations per renal unit was 2.11 (range 1-4). The overall stone-free rate was 82%. The average length of hospital stay was 4.4 days (range 3-7). The average duration of nephrostomy tube drainage was 80 hours with a range of 72 to 96 hours. Major and minor complication rate was 20% and 46.6%, respectively. CONCLUSION The performance of PNL is a safe and effective method to manage staghorn calculi in HKs.

Gabapentin in the management of the recurrent, refractory, idiopathic priapism

Recurrent idiopathic priapism is a difficult problem to treat and a true emergency for the physicians, and often even invasive therapeutic interventions fail. We recently managed three men with refractory idiopathic priapism with oral gabapentin. They responded to treatment within 48 h. Two men continue not to experience prolonged erections while treated with lower doses of gabapentin for 16 and 24 months, respectively. The third, after a successful treatment for 6 months, stopped gabapentin and priapism recurred. He responded to treatment again and continues to be free of episodes for 9 months. Gabapentin may be a safe alternative for the management of refractory idiopathic priapism.

Lichen Sclerosus et Atrophicus: Findings after Complete Circumcision

We prospectively evaluated 75 patients, 30-77 years old, with severe phimosis. All patients were treated surgically by complete circumcision and all surgical specimens were sent for histological evaluation. All patients with histologically proven lichen sclerosus et atrophicus (LSA) (eight patients, 10.6%) were re-evaluated 6 months postoperatively, and all but one were examined 5 years after the operation. All patients with histologically proven balanoposthitis (BP) (47 patients, 62.6%) were also re-evaluated 6 months postoperatively, and 41 patients 5 years after surgery. This group (BP) was the control group of our study. Six months after the operation, the eight patients with histologically proven LSA all had an excellent convalescence, and the lesions observed during the operation resolved in four patients and regressed in two patients. In one patient the glans presented with a pale grey-white-coloured plaque. Biopsy was performed and a well-differentiated squamous cell carcinoma infiltrating the glans was revealed. The control group of patients with histologically proven BP were also re-evaluated 6 months and 5 years after surgery. An excellent convalescence was observed in all patients who completed the follow-up examination. Care must be taken not to underestimate the potential relationship between LSA and squamous cell carcinoma, because the latter is usually invasive, very aggressive and requires immediate treatment.