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Additional benefits included a lighter scope with less cabling and improved ergonomics. The electrohydraulic lithotripter is associated with a significant temperature rise and high risk of ureteral thermal lesions. Evidence based prescription of antibiotics in urology: a 5-year review of microbiology. Further modifications to the endoscope have allowed its tip to be actively manipulated by the endoscopist along with the development of instrument channels. Finally, others prefer to position the patient with their legs flexed on supports, but with the ipsilateral leg lower and more extended [17]. Prospective randomized comparison of 2 ureteral access sheaths during flexible retrograde ureteroscopy. Regionalization of percutaneous nephrolithotomy: evidence for the increasing burden of care on tertiary centers. This lack of "routine" cases makes it often difficult for the medical student, house officer, and practicing physician to become familiar with more complex minimally invasive surgical maneuvers. Cobalamin is absorbed in the distal ileum; diseases of distal ileum can impair its absorption. Extrinsic ureteral obstruction can also be addressed acutely with a firm, larger diameter stent. Initially, ureteroscopes had a standard eyepiece design, which sees the ocular lens drawn in a straight line through the shaft of the scope. Patients presenting with these clinical predictors of cardiovascular disease warrant further evaluation prior to elective procedures, including low-risk procedures. If not treated immediately with angiographic embolization, it can lead to a catastrophic event. In general, laparoscopic management is reserved for diverticula that are large and extremely anterior or in ectopic kidneys where a percutaneous approach will be hampered. In severe cases of renal osteodystrophy, diffuse cystic areas of demineralized bone (osteitis fibrosa cystic) may occur. They found that the liver and spleen were not in contact with the supra-12th tract, but if the supracostal puncture was performed above the 11th rib during full expiration, the liver was punctured in 14% of cases. A transient systolic murmur occurs frequently in pregnancy, but a diastolic murmur should raise the suspicion of pathology. Patients with benign essential hematuria can have frequent bouts of gross hematuria with clots and renal colic; otherwise, their long-term course is generally benign. If ureteral stricture is detected, an endoureterotomy using the holmium laser is feasible, set at a higher frequency and intensity than the lithotripsy set-up. One case was misdiagnosed as a calyceal diverticulum and resulted in a postoperative urinoma; the other cases was successfully treated. Individual assessment of visual perception by surgeons observing the same laparoscopic organs with various imaging systems. The pelvic ureter receivess an additional supply from the internal iliac artery and its tributaries. The surgeon can be alerted to how realtime movement of the organ alters the line of excision for an intended target. This video noise or "cross talk" may be the cause of decreased resolution, grainy images, and loss of information around the edges of the video image. A retractor is placed in the incision opposite the tragus, and forward traction is applied to the flap. The specific characteristics of the knife (straight or hooked knife, scissors, etc. In addition, urine with altered chemical make-up, such as grossly bloody or purulent urine, may not demonstrate such an objective reduction in resistivity. Experimental studies on the physics of electrohydraulic shock waves in terms of energy density (J/mm2) indicated that better disintegration was obtained when the stone was placed below (in front of) the focal center. In these cases a holmium laser can be used to cut one of the wires of the tipless basket.

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Fat-soluble (hydrophobic) substances such as steroid hormones can dissolve in the hydrophobic bilayer and therefore can freely cross the membrane. Long-term experience with Bacillus Calmette-Guerin therapy of upper urinary tract transitional cell carcinoma in patients not eligible for surgery. No difference was seen for intraoperative or perioperative complications, embolization rates, narcotic usage, or change in glomerular filtration rate. If multiple areas of the ureter appear narrow in addition to the ureteral orifice, we place a ureteral stent and return to the operating room in approximately 1 week. Care should be taken while the sheath is being advanced that the balloon does not advance in to the renal pelvis. Commercially available dialysates are lactate based and with a dextrose concentration of 1. The procedure is performed usually through Short answer questions 125 laparoscopic surgery but can be performed as an open procedure, especially if concurrent surgery is occurring. Additional percutaneous access was required up to one-third of the time; this is not surprising given that complete staghorn calculi are one indication for upper pole access. A more aggressive option is to surgically implant a gastric pacemaker, although this is rarely done. Note that cardiac output increases from point A to point B as the preload increases. The advantages of a wireless network are the lack of having to install a wired network and the ability to communicate with mobile users. Osteoplasty of the condylar head is performed in the same fashion as described earlier. The device is mounted on an operating room table and can be fitted with a standard trocar needle. These guidelines are extremely helpful to standardize the administration of antibiotics prior to surgery. The timing of the administration of the diuretic after the administration of the radiopharmaceutical agent has been carefully worked out. Both the high attenuation and inhomogeneous nature of tissue will affect shock waves as they propagate through the body. The sheath is removed and a small skin incision allows advancement of sequential dilators for tract dilation. Other techniques have been described for coordinating the preoperative images to the intraoperative view. An additional complexity for the urologist, which is not encountered in the orthopedic and neurosurgical fields, is the mobility of the kidney within the retroperitoneum, including its continuous movement with respirations. Stone and pelvic urine culture and sensitivity are better than bladder urine as predictors of urosepsis following percutaneous nephrolithotomy: A prospective clinical study. In one series, orally administered fluconazole (100 mg twice daily for 10 days) eradicated candiduria in 19 of 20 critically ill patients, which was comparable to amphotericin B bladder irrigations [129, 130]. If access through the obstructed ureteral segment is unsuccessful, the nephrostomy tract can be dilated to facilitate antegrade diagnostic ureteroscopy. Movable transparent lead shields and drapes can also be used to further reduce exposure to individuals operating close to the radiation source. Type 2 epithelial cells are much less numerous but are important in producing surfactant (stored in lamellar bodies). Direct, precise biopsy, guided by ureteroscopic visualization of the lesion, permits a more accurate diagnosis than a brush biopsy guided by fluoroscopy alone. Advances in materials and endoscope design led to smaller and flexible endoscopes with improved optics.

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Folic acid and lifestyle issues should be discussed as early in pregnancy as possible, usually at the booking visit. These authors reported a recurrence rate of 50% among patients with grade 2 or 3 disease who were not treated with adjuvant therapy versus 27. The entire unit, consisting of tumor sample, basket, and ureteroscope, is then removed from the ureter and bladder. Access to the middle and lower poles of the kidneys is usually achieved subcostally. The perforation is usually recognized intraoperatively by contrast extravasation on fluoroscopy. If initially unsuccessful, negative pressure is applied to the needle while being withdrawn as it may then be slowly pulled back in to the collecting system. However, they observed a reduction in sodium and water reabsorption in both the proximal and distal nephrons. There are no randomized studies proving the efficacy of such a regimen, but experimental as well as clinical data have shown that fluid surrounding the stones may be associated with improved disintegration [48]. Sensitivity of noncontrast helical computerized tomography and plain film radiography compared to flexible nephroscopy for detecting residual fragments after percutaneous nephrostolithotomy. A series of experiments in which imageguided access to porcine kidneys was performed Needle-based therapies such as thermal ablation are increasingly being utilized for the treatment of renal tumors. Other concerns with the balloon catheters include an inability on occasion to dilate through dense scar tissue and the risk of balloon rupture causing barotrauma. The traditional diuretic renogram is performed by administering the radiopharmaceutical agent and obtaining images, followed 20 min later by intravenous administration of the diuretic, and then measuring the half-life for the clearance of the tracer from the collecting system. Executive summary: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the 2002 Guidelines on Perioperative Cardiovascular Evaluation for Noncardiac Surgery). This includes patients who have not fasted for 6 or more hours (solids), patients with gastroparesis and delayed gastric emptying, or those who have recently vomited. In patients with struvite stones, which tend to form large, irregular pieces on fragmentation, an endopyelotomy stent (14/8. Such larger volumes are needed to ensure significant spread of the local anesthetic within the dural area to reach nerve roots. Furthermore, dilation of the infundibulum and creation of a neoinfundibulum have the potential to create significant bleeding. The rapid expansion and collapse of the resultant plasma bubble generates an acoustic shock wave that fragments the stone [54]. The management of these complications includes various measures from watchful waiting associated with hemodynamic balancing to selective arterial embolization, or, in extreme cases, open surgery including nephrectomy. The treatment of ureteral avulsion depends on the extent and location of the injury. Contemporary percutaneous nephrolithotripsy: 1585 procedures in 1338 consecutive patients. The techniques used for treatment, the location and characteristics of the tumors, and follow-up techniques and duration have varied widely. This acidosis is further exacerbated by the hyperglycemia, because the hyperglycemia causes an osmotic diuresis which results in volume depletion. Ureteral false passages produced during guidewire advancement can lead to serious lesions if later they act Chapter 47 Ureteroscopy Complications 511 using 8. Another hindrance of anterior punctures is that it can lead to difficulties in navigating the rest of the collecting system. However, for kidney tissue it has been estimated that this time scale may be of the order of 1 s [111]. We have found that most of the recurrent lesions are small and can be treated endoscopically.

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Chronic bladder outlet obstruction may also cause bladder trabeculations or diverticula, which may distort intravesical anatomy and hinder the identification of the orifices. The term renal function is used to refer to the rate at which the kidneys remove toxins from the circulation. Both situations can therefore result in hypergastrinemia, a metabolic anomaly that is largely benign. A C-arm image intensifier is used to examine the anatomy of the collecting system and the position of all stones. At the nadir of the collapse, the bubble radius is less than 1 m and the dynamics of the collapse is at nanosecond time scales. The efferent autonomic signals are transmitted to the various organs of the body through two major subdivisions, the sympathetic nervous system and the parasympathetic nervous system. Arterial hemorrhage Postoperatively, patients can present with acute or delayed hemorrhage. Zone 2 blood flow: no blood flow during diastole because of collapse of pulmonary capillaries; occurs in upper two thirds of lungs Zone 3 has continuous blood flow during the cardiac cycle. It is generally accepted that a clearance of the radiopharmaceutical agent from the renal pelvis with a half-life of less than 10 min is normal; some experts consider a halflife of less than 15 min to be normal. It involved cervical amputation, anterior and posterior repair, and shortening the cardinal ligaments. For added pressure, the condyle is seated in the fossa, particularly if the source of bleeding is located in the posterior pouch. Prior to insertion, the instrument should also be examined to ensure that all deflecting cables operate properly and that the tip can be deflected to the recommended extent in each direction. Pathophysiology of unilateral ureteral obstruction: studies from Charlottesville to New York. Factors suggestive of poor outcome include oligoanuria for more than 2 weeks, severe neurological involvement and presence of cortical necrosis. There are, however, some characteristic symptoms that should be screened for in all patients in whom the diagnosis is suspected. This is particularly true when using a semi-rigid instrument since it may not be possible to advance the scope further proximally in the ureter to reach the stone if it has been displaced. Risk factors for ureteral injury during gynecologic surgery include uterine size, pelvic organ prolapse, and prior pelvic surgery. Each has inherent advantages and disadvantages, and therefore the clinical agenda dictates particular imaging utilization. Percutaneous nephrostomy tube placement will likely be necessary, and ureteral reconstruction may be considered in the same sitting if severe injury has occurred to a focal segment. The placement of the end of the ureteral access sheath determines the length selected. Most current lithotripters use an enclosed water path in which the shock head is capped by a rubber membrane of low acoustic impedance. While dilation may enable access to the ureter, it can be traumatic and cause edema and/or urinary extravasation; thus, it is important to ensure a ureteral stent is placed at the end of the case if dilation is performed. Incision also should extend at least 2 mm proximal and distal to the area of stricture, and not just until balloon waisting is lost. Particular consideration in puncturing in to the hypomobile joint has to increase the awareness of the surgeon. Excluded calyx Occasionally an infundibular stenosis will be so severe that the calyx closes off completely and there is no communication between it and the renal pelvis.

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Biplanar fluoroscopy is performed using the C-arm in two positions, anteroposterior and oblique. Conclusions the application of video technology to endoscopic procedures provides several advantages in both the teaching and private practice settings not previously available to the urologist. As a consequence, the scope had to be passed through an access sheath or stiffened temporarily by placing a 0. Only normal saline irrigation is used unless electrocautery is required, when it is changed to a nonelectrolyte solution such as is used for transurethral prostatectomy. In an in vitro study, this system was found to be associated with significantly higher flow rates and lower pressures when compared with a single nephrostomy tube without ureteral catheters [8]. It will be shown below that the particle velocity is needed in order to determine the energy in an acoustic wave. These can be divided in to components of local data relay and of the local and distant data relay system. If flexible nephroscopy is utilized, the cyst is simply marsupialized in to the collecting system using a holmium laser, as previously described for the ureteroscopic approach. Consequently, an upper pole posterior calyceal puncture lateral to the paraspinal muscles will result in access being more in line with the axis of the kidney. If the initial indication for blind nephrostomy was the inability to opacify the collecting system, an antegrade pyelogram can be performed to retarget an alternate calyx if deemed necessary. Observation alone is a reasonable approach for those patients with mild-to-moderate symptoms that can be controlled with oral analgesics, and those who do not have any factors that would warrant immediate intervention. The side effects of extensive radiation during therapeutic procedures are well-known, which is the main drawback of fluoroscopy [1]. This has limited the use of baskets for stone fragment extraction in numerous centers. Three interventions have been shown to reduce the vertical transmission rate: avoiding breastfeeding, elective Caesarean section (where the viral load is >50 copies/mL), and antiviral medication during the later half of pregnancy and in to the neonatal period. Women with pre-existing psychiatric disorders often experience an exacerbation or recurrence. Ultrasound-guided nephrostomy puncture is preferred for patients in whom retrograde ureteral access is unsuccessful. More recent studies are more difficult to compare since they have included a wide range of tumor sizes and even higher grade lesions. It is the responsibility of all physicians, including urologists, to implement ways to reduce radiation dose without compromising patient care. The time for most blood banks to convert a "type and screen" to available crossed units is minimal unless the patient has been recently transfused or has rare antibodies. The contribution from tube leakage, and scatter from machine components and from the patient comprises the secondary radiation field and this is of the most concern to persons in the room during fluoroscopic imaging. While these anticoagulants are necessary, they can pose a difficult and complex problem for both the urologist and patient when elective or nonelective procedures need to be performed. Typically, normal saline is infused via the percutaneous nephrostomy tube, starting at a very slow rate, and gradually increasing to a rate of approximately 50 mL/h. The authors proposed that this effect is likely related to the increased complexity of the case. The occurrence can be minimized with the judicious use and positioning of the Amplatz sheath to avoid leakage in to the pleural space and maintenance of a low-pressure system as well as adequate renal drainage postoperatively [18]. Primary as well as booster doses of inactivated vaccines can be given 6 months after transplant. A retrospective study of antegrade percutaneous ureteroscopy for upper ureteral stones of greater than 1 cm in diameter in 192 patients with severe hydronephrosis reported a 5% stricture rate [39]. The upper and lower esophageal sphincters are located at the top and bottom of the esophagus, respectively. Conservative treatment was successful in all but two patients in whom a colostomy was necessary. Anamnesis Chief Complaint this extremely important step of patient assessment is probably the most easily dismissed area of anamnesis. At the conclusion of the procedure, a stent is placed across the dilated segment (see Stenting options below). This is because vitamin K-dependent clotting factors within the newborn may be reduced and lead to haemorrhagic disease.

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Irregular heavy bleeding is a side effect associated with the copper coil; however, the Mirena is usually associated with reduction of menstrual loss. The main challenge in dilating the tract is to ensure the dilator can obtain enough purchase within the calyx to allow insertion of the working sheath. The design of the electromagnetic cylinder source offers the possibility to select different focal zones, precise and extended, according to clinical and anatomic conditions. Closing the eyes leaves only vestibular and proprioceptive input to the cerebellum, which is sufficient to maintain balance if they are fully functional. The optical fibers within the cable can be used for highspeed transmission of data. In non-anticoagulated patients, intraoperative and perioperative hemorrhage is not uncommon. The advent of improved endourologic techniques facilitates access to any part of the upper tract so that tumor location is no longer a limiting factor. There is microvascular injury, thrombosis, and loss of endothelial integrity (capillary leak), resulting in tissue ischemia. As these technologies continue to develop, their applications in minimally invasive endourologic practice will only grow. Hematuria initially can be divided in to glomerular or nonglomerular causes based on urinalysis alone. Percutaneous nephrolithotomy Despite the fact that percutaneous renal surgery is associated with lower morbidity, it is not without its complications [15, 16]. Late postoperative complications Late complications are extremely rare due to equipment improvement and growing endoscopic experience. Overall, when a flexible ureteroscope is available and the operating surgeon is comfortable and experienced with its use in the proximal ureter and kidney, stone migration is a minor concern and can usually be avoided with simple measures as described above. A unique set of complications can develop in the setting of an undrained or poorly drained hemothorax, including empyema and fibrothorax. A flexible cystoscope can also be utilized to identify the orifice beneath the lobe and in patients with a very high riding bladder neck, which prohibits bladder access with a rigid scope. Absolute contraindications include contemporary or suspected pregnancy, suspicion of breast cancer, suspicion of endometrial cancer, acute active liver disease, uncontrolled hypertension or confirmed venous thrombotic event. Nephrostomy tract tumor seeding following percutaneous manipulation of a ureteral carcinoma. Outcomes Percutaneous treatment of calyceal diverticular calculi achieves a stone-free rate ranging from 87. Most common cause is iatrogenic, because of the abrupt cessation of chronically administered steroids; in this case, the hypothalamic-pituitary-adrenal axis has been chronically suppressed and needs several weeks to "wake up. Naftopidil has been used clinically for stone expulsion with positive results, yielding a spontaneous stone passage rate of 90% versus 27% in controls for an increased probability of stone expulsion of 5. Laceration of the external auditory meatus occurs by transfixion of the canal with the arthroscope at the junction of tragus and osseous meatus. However, if the stone is not easily seen or there is a question regarding the ureteral anatomy, then it is best to perform a retrograde pyelogram to define the involved collecting system and ureter. Where sufficient maternal effort is possible, it is an appropriate strategy in cases of delay or fetal distress in the second stage. There was, however, a high mortality rate with 11 of 20 patients dying of unrelated causes, with one dying from invasive bladder cancer. In vitro and randomized clinical studies have demonstrated that the Cook Flexor sheath (Cook Urological, 390 Section 3 Ureteroscopy: General Principles peratures and turns in to a gel at body temperature. Success rates utilizing this technique have been described in the literature and, similar to other endourologic techniques, length and vascularity of the involved segment are critical factors in determining success rates [9, 33, 34]. Acquired infundibular stenosis, although generally asymptomatic, has been reported to lead to progressive renal failure, and some physicians advocate surgical correction [59]. The hooked probe is also preferred in difficult cases of disk reduction, with lax/redundant retrodiskal tissue, where a straight probe may lacerate the structure. Short, permanent, balloon, or self-expandable metal stents, similar to vascular stents, have also been utilized for ureteroenteric strictures. Ventouse can be applied only when the cervix is fully dilated and the fetal membranes are ruptured. However, cocaine can also compromise myocardial O2 supply by causing coronary artery vasospasm.

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However, not all studies have concurred on the benefits of this method for access planning [16]. The disk is held in reduced position with the probe and the working cannula, while the scope is retracted to a lateral position. Animal studies since the seminal reports by Davis note a predominance of myofibroblasts during the initial healing period, suggesting that healing may, in part, occur through wound contraction. Pain receptors are free nerve endings that are located in the skin, muscle, and viscera and are responsible for the detection and perception of pain (nociception). In a multicenter trial of Acucise incisions, the authors noted common iliac artery 490 Table 45. An additional advantage is the elimination of serial dilation, which saves operating room time [7]. Concerning the kidney midzone (hilar) drainage, our results show that this region is drained by paired calyces arranged in two rows (anterior and posterior) in 95. Chapter 6 Surgical Anatomy of the Kidney in the Prone, Oblique, and Supine Positions 18. Supracostal access was obtained in 20 of the procedures and subcostal access in the remaining 40 procedures. Intramuscular and blood pressures in legs positioned in the hemilithotomy position: clarification of risk factors for well-leg acute compartment syndrome. It is important that patients are advised of this risk and that urologists be cognizant of management protocols. How the shock-wave energy is divided between the longitudinal and transverse waves depends on the material properties of the stone and the angle of incidence. While some studies have shown fewer symptoms and less pain in those patients without a stent, a meta-analysis found a trend towards fewer urologic Table 46. The use of a smaller diameter ureteroscope has also been associated with a reduction in ureteric complications. This inconvenience can be overcome by positioning the patient, for a few minutes, in an anti-Trendelemburg position. While more costly, the enhanced depth perception produced by 3D endoscopes has been demonstrated to improve the performance of minimally invasive surgical procedures [67, 68]. This was mainly due to the high costs of the first lithotripters: high capital, running, and maintenance costs. Instead, the image seen at the distal tip of the scope is electronically and digitally transferred through a single cable and recreated on a televisions monitor. In addition, the flexible nature of the laser fiber facilitates both flexible ureteroscopy and renoscopy (both antegrade and retrograde). Urothelial injury from ethylenediaminetetraacetic acid used as an irrigant in the urinary tract. Injury to the lung and pleura can occur with access through any renal calyx, however the incidence increases significantly with upper pole and supracostal access. Most surgical meetings today devote a major session to the live operative workshop. The amplitude of the wave at clinically relevant power settings is normally high enough that nonlinear distortion occurs during propagation, and a shock is produced before the wave reaches the focus. Pilot study of ureteral movement in stented patients: first step in understanding dynamic ureteral anatomy to improve stent comfort. The waves travel until they reach the air-filled middle ear, where they cause the tympanic membrane to vibrate. Fertilization involves the degradation of the zona pellucida of the oocyte by enzymes released from the acrosome of the sperm. In cases where there is a low risk of infection, then the utility of postoperative antibiotic prophylaxis becomes less clear. Chapter 49 Physics of Shock-Wave Lithotripsy 535 of the focal zone depends on the diameter of the source, the focal length of the source, and the frequency content of the waveform.

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Such light sources have an automatic lightsensing feature, which can adjust the amount of light to the preset requirement of the camera. They influence the temperature regulatory centers in the hypothalamus, resulting in fever. Oral fluconazole versus amphotericin B bladder irrigations for treatment of candidal funguria. This, fortunately, appears to be rarely reported in the literature but remains a concern. These complications are well-described in the general surgery literature as sequelae of traumatic hemothorax. Convex probes these probes produce rectangular scans and are most commonly used for gaining percutaneous renal access. The M line lies in the center of the H zone and is therefore composed only of myosin filaments. In most cases, it is helpful for the surgeon to rest their arm on the patient during the access part of the procedure, as this minimizes unintended drifting of the needle away from the targeted axis and also provides additional needle stabilization. In Disorders of Kidney and Urinary Tract - children, aldosterone unresponsiveness is more common than aldosterone deficiency and is commonly associated with obstructive uropathy. Bleeding Access location Choice regarding the ideal calyx for percutaneous access is dependent on patient anatomy, stone burden, and individual surgeon preference. If inpatient care is required post-natally, it is better that the baby should be cared for elsewhere. The main differences are the incidence and mechanism of occurrence of ureteral perforation and stricture. Once it has spread outside the cervix, radiotherapy is the main treatment modality. The bubble will then collapse by virtue of the near vacuum inside the bubble and the roughly 1 atm of ambient pressure in the surrounding fluid. The group compared maneuverability, visibility, inferior calyx approach, maximal tip deflection and irrigation flow, and endoscopes fragility. Pelvicaliceal biomodeling as an aid to achieving optimal access in percutaneous nephrolithotripsy. Catecholamines are like other "stress" hormones such as cortisol and function to maintain adequate levels of plasma fuels such as glucose and free fatty acids. This is usually accomplished by placing the open-ended catheter up to the level of the obstruction, and through which the guidewire is directed to gain proximal access. A large segment of the general population has only minimal signs and symptoms associated with disc derangements. Lead glasses are especially recommended for endoscopic surgeons due to their proximity to the radiation source and chronic exposure. This spark gap technology also allows the generation of a focal zone that varies in size with the power output. It is, therefore, only useful in partially obstructing distal ureteral strictures. Its greatest advantage is use for realtime monitoring of the needle tip, which guides proper placement of the needle and avoidance of important viscera. Discarding antimicrobial prophylaxis for transurethral resection of bladder tumor: A feasibility study. The term enterohepatic circulation describes the cycling of substances between the liver and intestinal tract; it does not refer to a distinct anatomic circulation. Given the potential advantages of the digital ureteroscopes, it is hard to envisage that the fiberoptic instruments will remain in circulation beyond the next decade. This deep incision must be carried out whether the approach is through a nephrostomy tract, by ureteroscopy, or with an Acucise catheter, and whether the instrument used to incise the stricture is a cold knife or an electrosurgical probe [42].