Genitourinary Notes PROCESS OF EXCRETION INVOLVES FINDING AND REMOVING WASTE MATERIALS PRODUCED BY THE BODY. PRIMARY ORGANS: SKIN, LUNGS AND KIDNEYS. LUNGS – WASTE GASES CARRIED BY BLOOD TRAVELING THROUGH VEINS TO THE LUNGS WHERE RESPIRATION TAKES PLACE. SKIN – DEAD CELLS AND SWEAT ARE REMOVED FROM THE BODY THROUGH THE SKIN. KIDNEYS – LIQUID WASTE IS REMOVED FROM THE BODY THROUGH THE KIDNEYS. BLOOD PASSES THROUGH THE KIDNEYS IN ORDER TO DEPOSIT USED AND UNWANTED WATER, MINERALS AND A NITROGEN-RICH MOLECULE CALLED UREA. KIDNEYS FILTER METABOLIC WASTE FROM BLOOD FORMING A LIQUID CALLED URINE. URINE IS FORMED FOR THE ACTIVITIES OF THE KIDNEYS. THE KIDNEYS ARE ORGANS THAT REGULATE THE COMPOSITION AND VOLUME OF BLOOD BY BALANCING FLUID AND ELECTROLYTES. THEY BALANCE ACID BASE. KIDNEYS INFLUENCE BLOOD PRESSURE BY SECRETING THE ENZYME RENIN. KIDNEYS FUNNEL URINE INTO BLADDER ALONG TWO SEPARATE TUBES CALLED URETERS. BLADDER STORES URINE UNTIL MUSCULAR CONTRACTIONS FORCE URINE OUT OF BODY THROUGH THE URETHRA. DAILY 1.5 L OF URINE PRODUCED – URINATION REMOVES IT. DISEASED KIDNEYS BUILD UP WASTE. CAN CAUSE DEATH. DIALYSIS PT AVERAGE 60 HOURS/WEEK FOR FILTRATION. ANATOMY – 2 KIDNEYS, 2 URETERS, 1 BLADDER, 1 URETHRA 1. KIDNEYS STRUCTURE: a. CORTEX – OUTER LAYER i. NEPHRONS – FILTER AND REMOVE TOXIC WASTE FROM BLOOD, BALANCE BLOOD pH, REABSORB AND SECRETE TO CONTROL BLOOD VOLUME AND CONCENTRATION BY REMOVING SELECTED AMOUNTS OF WATER AND SOLUTES. 1.25 MILLION NEPHRONS/KIDNEY b. MEDULLA – MIDDLE LAYER i. RENAL COLUMNS & PYRAMIDS c. CALYX – CUP LIKE STRUCTURE AT PT OF PYRAMID, FORM INTERIOR CAVITY (RESERVOIR) LEADS TO URETER OPENING. THE RENAL PELVIS IS THE PART OF THE KIDNEY THAT IS THE COLLECTING POINT FOR URINE FORMED IN THE KIDNEYS. PERISTALSIS CARRIES URINE FROM THE RENAL PELVIS TO THE URETER. i. RENAL CORPUSCLE – GLOMERULUS AND BOWMAN’S CAPSULE ASSIST IN URINE FORMATION TISSUE LAYERS: a. RENAL FASCIA – OUTER LAYER COVERS KIDNEYS AND ANCHORS THEM TO PERITONEUM AND ABDOMINAL WALL b. PERIRENAL ADIPOSE – MID LAYER THAT SURROUNDS AND BUFFERS KIDNEYS c. GEROTA’S CAPSULE – INNER LAYER THAT FORMS A SMOOTH, FIBROUS SURFACE SURROUNDING TISSUE AND STRUCTURES: ADRENAL GLANDS – PAIR LIE IN FASCIA SUPERIOR TO KIDNEYS. LEFT > CRESCENT SHAPE, RT > TRIANGLE RENAL HILUM – NOTCH WHERE OTHER STRUCTURES ENTER OR LEAVE KIDNEY RENAL PELVIS – ENLARGED PORTION OF URETER THAT JOINS IT TO KIDNEYS HIGHLY VASCULAR ORGAN WITH UNUSUAL BLOOD FLOW PATTERN. BLOOD SUPPLY CRUCIAL DURING SURGERY BLOOD SUPPLY – RENAL ARTERY OFF AORTA RENAL VEIN OFF INFERIOR VENA CAVA RENAL ARTERY DIVIDES, SMALLER BRANCHES INTO NEPHRONS, EXIT THRU SMALL VESSELS THAT BECOME RENAL VEINS AND FLOW INTO INFERIOR VENA CAVA FOR RETURN TO HEART. ADRENAL VENULES ALSO IMPORTANT. NERVE SUPPLY – SPLANCHNIC NERVES – COME FROM THORACIC SYMPATHETIC GANGLIA WHICH INNERVATE VISCERAL ORGANS. 2. URETERS – SLENDER, MUSCULAR TUBES LOCATED IN RETROPERITONEAL CAVITY – EXTEND FROM KIDNEY TO BLADDER – PASS URINE VIA GRAVITY AND PERISTALTIC ACTION STRUCTURE – UPPER, MIDDLE – L5 TO SI JOINT, BOTH ABD AND PELVIC AREAS INCLUDED, LOWER- CLOSEST TO BLADDER THREE TISSUE LAYERS – FIBROUS, MUSCLE, MUCOUS OF EPITHELIALS BLOOD SUPPLY – ADRENAL/RENAL ARTERIES, HYPOGASTRIC ARTERY, SPERMATIC/OVARIAN ARTERIES, UMBILICAL ARTERY VENOUS DRAINAGE – ILIAC VESSELS, EPIGASTRIC VESSELS, PREAORTIC NODES NERVE SUPPLY – PART OF AUTONOMIC NERVOUS SYSTEM, RESULTING IN PERISTALTIC ACTION 3. BLADDER – BAG RESERVOIR EXPANDS OR COLLAPSES BASED ON URINE FLOW FROM KIDNEY 250 ML USUALLY BRINGS SENSATION TO VOID – voiding reflex STRUCTURE – TRIGONE FLOOR – ATTACHED AT POSTERIOR CORNERS OF TRIGONE FLOOR ON EITHER SIDE ARE OPENINGS FROM EACH URETER AND A SINGLE LARGER HOLE AT BLADDER NECK BLADDER NECK ATTACHED TO URETHRA AND TO SPECIALIZED LIGAMENTS TISSUE LAYERS – INCOMPLETE PERITONEUM LAYER COVERS ONLY UPPER PORTION BLADDER URETHRAL SPHINCTERS – TWO MUSCULAR STRUCTURES THAT PREVENT URINE FROM LEAVING THE URINARY BLADDER. EACH URETHRAL SPHINCTER IS A CIRCULAR MASS OF MUSCLE TISSUE. RELAXATION OF THE SPHINCTERS ALLOWS URINE TO BE FORCED THROUGH THEM. INVOLUNTARY DETRUSOR MUSCLE MID LAYER FOR STRETCHING MUCOSAL/SUBMUCOSAL LINING FOLDS INTO RUGAE WHEN COLLAPSED GENDER DIFFERENCES – MALE - BLADDER NECK CLOSE TO PROSTATE – ANCHORED TO POSTERIOR PUBIS BY PUBOPROSTATIC LIGAMENTS ON SIDES OF PENIS DORSAL VEIN FEMALE – DIRECT CONTACT WITH LEVATOR ANI ANCHORED TO POSTERIOR PUBIS BY TWO PUBOVESICAL LIGAMENTS ON EITHER SIDE OF CLITORIS DORSAL VEINS ARTERIES – SUPERIOR/INFERIOR VESICAL ARTERIES NERVES – SACRAL AND PARASYMPATHETIC 4. URETHRA – SMALL, SHORT TUBE DRAINS BLADDER LEADS FROM BLADDER FLOOR TO URINARY MEATUS EXCRETIVE AND REPRODUCTIVE COMBINE IN MALE, NOT IN FEMALE. STRUCTURE – UPPER – CLOSEST TO BLADDER MIDDLE – BLADDER TO MEATUS LOWER – CLOSEST TO MEATUS FEMALE – BLADDER FRLOOR 3-4 CM TO OUTSIDE MALE – 20 CM IN LENGTH – PASSES URINE PROSTATE GLAND – LIES BELOW URINARY BLADDER AND SURROUNDS MALE URETHRA COWPER’S GLANDS – SECRETE MUCUS TESTIS – CONTAINED IN SCROTUM PENIS – SPONGY TISSUE EMPTY BLOOD SPACES THREE CORPUS SEGMENTS – SPONGIOSUM CONTAINS URETHRA, CAVERNOSUM – SURROUNDS EACH SIDE SPONGIOSUM, GLANS PENIS – DISTAL TIP COVERED BY PREPUCE 5. URINARY MEATUS – External opening PROSTATE CANCER IS THE 3RD LEADING CAUSE OF CANCER RELATED DEATHS IN MALES 1. LUNG 2.COLORECTAL METASTASIS – LYMPHATIC / VASCULAR CHANNELS OBTURATOR LYMPH NODES REMOVED FOR FROZEN SECTION TO ASSESS METS BEFORE PROCEEDING WITH RADICAL PROSTATE MALE REPRODUCTIVE ORGANS – BLOOD SUPPLY – DORSAL, HYPOGASTRIC, PUDENDAL, RECTAL, SPERMATIC, VESICAL ARTERIES NERVES – DORSAL NERVES – VESICAL,PERINEAL,PROSTATIC NERVES CONDITION OR DISEASE GU SURGERY CONGENITAL DISEASE – HYPOSPADIAS – ANTERIOR URETHRA TERMINATES ON UNDERSURFACE OF PENIS OR ABOVE FEMALE CLITORIS PHIMOSIS – CONSTRICTION OF FORESKIN WILMS TUMOR – CHILDHOOD MALIGNANT NEOPLASM OF KIDNEY PRESENTS AS A FIRM, PAINLESS MASS WHOSE ENLARGEMENT MAY LITERALLY DISTEND THE ABDOMEN ACQUIRED DISEASE– BALANTITIS – INFLAMMATION OF GLANS PENIS CANCER – PRESENCE OF FLANK MASS HYPERNEPHROMA – TUMOR WHOSE CELLS RESEMBLE ADRENAL CORTEX NEUROBLASTOMA – MALIGNANT TUMOR AFFECTING ADRENAL GLANDS CUSHINGS DISEASE – ADRENAL OR HYPOTHALAMUS DYSFUNCTION OR METABOLIC DISORDER RESULTING IN WEIGHT GAIN, EDEMA, HYPERPLASIA/GLYCEMIA HYDROCELE – MALE – SEROUS FLUID TESTES/CORD FEMALE – FLUID IN VAGINA/LABIUM BPH – Benign Prostatic hypertrophy or ENLARGEMENT OF PROSTATE RENAL CALCULI – BASED ON UREA THAT HAS AN ACID PH OR URINE IS SUPERSATURATED FOR EXTENDED PERIODS SO THAT CALCIFIED CHUNKS OR CRYSTALLIZED MINERALS FORM IN CHUNKS 40% PT GET 2ND STONE IN 2 YRS 80% PT GET 2ND STONE AT SOME TIME RENAL FAILUE AND UREMIA – KIDNEYS FAIL TO PROCESS PLASMA AND PRODUCE URINE UREMIA -= FINAL STAGE OF RENAL FAILURE. WASTE PRODUCTS ACCUMULATE IN BLOOD TORTION TESTICLE – TWISTED ON SPERMATIC CORD. PAINFUL. EMERGENT. TISSUE DEATH CAN OCCUR UTI – CYSTITIS, NEPHRITIS, URETHRITIS TRAUMA ELECTIVE SURGERY – CIRCUMCISION – Excision of foreskin of glans penis. A few adult medical conditions such as Phimosis, penile malignancies or balantitis require this surgery. VASECTOMY – Excision of a section of the vas deferens as a permanent method of male sterilization or prior to a prostatectomy to prevent spread of infection from the urethra to the epididymis. Genitourinary Procedure Notes PURPOSES OF GENITOURINARY SURGERY: 1. Investigate and restore function to principal organs of the urinary system. 2. Investigate and restore function to related organs of the urinary system such as the adrenal glands and the prostate, testicle and penis. 3. Detect and inhibit urinary system disease, including the partial or total removal of diseased urinary system tissues and supporting structures when other measures have failed. The urinary system is composed of two kidneys, two ureters, the urinary bladder, urethra and urinary meatus. Its processes include regulation, filtration, reabsorption and secretion. This functions to balance blood plasma by regulating water content and maintaining water balance, produce urine as waste product during regulation, adjust blood pH and blood contents, such as sodium and potassium, excrete the resulting toxins, electrolytes and water after adjustments are made, and regulate red blood cell production and blood pressure (Renin – natural kidney hormone). STRUCTURE SPECIFIC PATHOLOGY: 1. Anuria – lack or absence of urine 2. Dysuria – pain during urination 3. Hematuris – presence of blood in the urine 4. Hydronephrosis – distention of the pelvis and calyces of the kidney from urinary retention 5. Nocturia – need to urinate at night, often disturbing sleep many times 6. Obstructive uropathy – weak urine stream, hesitancy starting urine stream 7. Oliguria – very little urination 8. Pyruia – the presence of pus in the urine 9. Urinary retention – inability to completely empty the bladder COMMON LAB/DIAGNOSTIC TESTS: 1. Biopsy 2. BUN – Blood Urine Nitrogen – measures waste products of protein metabolism to assess renal function 3. PSA – prostate specific antigen – measures the level of Prostatic antigens 4. UA – urinalysis – chemical screening of urine. Urine is 95% water. Color, odor, specific gravity, appearance, pH, protein, ketones, occult blood, leukocyte esterase, nitrite and glucose content are determined by urinalysis. Microscopic exam of urine. High protein diet increases acidity of urine while mostly vetetables increases the alkalinity of urine. High altitude, fasting and exercise are other factors that affect urinary pH. 5. Urine culture – diagnoses UTI (urinary tract infection) a colony count is done and along with symptoms may reveal cystitis. 6. CT scan – detects subtle differences in tissue density, differentiating between benign and malignant renal cysts. It can also detect suprarenal masses, hydronephrosis, and kidney tumors. 7. KUB – flat plate x-ray of Kidneys,Ureters,Bladder to determine size, shape and kidney location. Renal calculi, tumors and abnormalities may also be seen. 8. Intravenous pyelogram – IVP – study of structures of urinary system by injecting contrast medium into the circulatory system. Contrast makes its way to the kidneys for excretion. Multiple x-rays taken can reveal ureteral obstructions, trauma or retroperitoneal tumors Post void film can check bladder emptying. Poor excretion may result in the last film 24hrs post first. 9. Retrograde pyelogram – x-ray of renal pelvis and any calyces in the kidneys and ureters as well as shape and position of kidneys and ureters following injection of contrast medium via catheters placed in each ureter. 10. Renal angiography – x-ray of renal blood vessels to help diagnosis renal artery stenosis, abnormality, mass or renovascular hypertension. Catheter inserted into femoral artery and threaded up the aorta to the level of the renal arteries. Dye is injected and rapid filming is done. 11. Renal Biopsy – A biopsy needle is inserted through the skin into the lower lobe of the kidney. Harvested tissue is examined to diagnose renal disease or to track progression of renal disease. Post procedure patient needs to lie still for 4 – 12 hours and is monitored by nursing staff. Possible complications include infection and hemorrhage. 12. Renal scans – A radioactive isotope is injected intravenously. Using a gamma camera or probe, radioactivity in each kidney is measured as the tracer leaves the kidney. This results in a curve. Various curves are associated with specific conditions. Renal scans are often used to detect abscesses, cysts, tumors, trauma or track rejection of a transplanted kidney. 13. Renal ultrasound – Helps differentiate a solid tumor from a renal cyst or identify obstructions. 14. Urethrogram or cystogram – x-ray visualization of the urethra or bladder following injection of a contrast medium. 15. Urodynamic studies – Performed when patient reports micturition difficulties a. Uroflowmetry – records flow rate of urinary stream b. Cystometry – graphic representation of the bladder’s response to pressure and its capacity for fluid as the bladder is filled with saline, sterile water or carbon dioxide. c. Electromyography – records electrical activity in striated muscles to evaluate neuromuscular coordination of bladder activity. SPECIAL FEATURES OF GENITOURINARY SURGERY 1. Preoperative prerequisites – Most GU procedures are minimally invasive procedures, but an invasive surgery setup may be required to avoid delay should a more invasive procedure be necessary. 2. Positioning – Some GU procedures require exacting positioning requiring the surgeon’s assistance. Lateral positioning is standard for kidney cases, but table flexion can be critical and varies greatly from procedure to procedure. Lithotomy is standard for closed cases. 3. Intraoperative issues – Generally, highly vascular areas require greater preparation and thought. BASIC SUPPLIES, EQUIPMENT AND INSTRUMENTATION FOR GU SURGERY 1. Equipment – Cysto table with x-ray unit, ESU, Maxwell table (shortened table) 2. Instrumentation – as listed on handouts 3. Instrument sets – hospital urology set, major laparoscopic set, cystoscopy, ureteroscopy, TUR equipment, minor basic set 4. Cystectomy – major lap set and bowel resection set 5. Prostatectomy – basic lap plus prostatectomy instruments 6. Vasectomy and meatotomy – minor basic plus vas instruments 7. Stopcocks – valves to control flow of a substance 8. Urethral sounds – used for dilation (Van Buren – common) 9. Supplies – contrast medium, syringes and needles Cystotomy or laparotomy pack Ellick evacuator – for removing substances from surgical site Urethral and ureteral catheters – non-retaining, self-retaining Urostomy pouch – for diversion of urine to bag Water soluble surgical jelly – non-conductive lubricant CHARACTERISTICS AND SIZING OF CATHETERS 1.General Information Made of latex or silicone Most are radiopaque Diameter of lumen – divide French size/3. An 18 French has a 6mm lumen. Size depends on age and sex of patient – children – 8 or 10 urethral cath Adults – 14 – 18 urethral catheter 2. Ureteral catheter characteristics Smaller in diameter and longer than urethral caths Range in size from 3 – 14 French Many styles, sizes – plain whistle tip, olive tip, cone tip Usually inserted into ureter by urologist through cystoscope Place a ureteral stent, obtain renal pelvis specimen, splint ureter, inject dye Must be labeled left or right, taped securely in place and connected to bag 4. Urethral catheter characteristics Shorter and larger in diameter than ureteral caths Range in size from 8 to 30 French 5. Suprapubic catheter characteristics Contain a third lumen for irrigation Used as closed drainage system when placed by suprapubic incision or trocar puncture RELEVANT GU POSITIONS AND INCISIONS 1. Closed surgeries – lithotomy position 2. Kidney – generally lateral position a. Lumbar or simple flank incision – thorax forward and downward to iliac b. Nagamatsu or dorsolumbar flap incision – made over 11th and 12th ribs c. Thoracoabdominal incision – 10th, 11th ribs resected, chest opened d. Supracostal extrapleural – along superior margin of 12th rib e. Subcostal and transverse abdominal – medial line from 12th rib in a curve along the lower costal margin f. Vertical abdominal incision – midline or paramedium incision 2cm from midline, extending upward to at or above xyphoid g. Transperitoneal midline incision – semirecumbent position extending below ribs to abdomen for effective rib retraction 3. Ureter – generally lateral for anterior or posterior approaches and lithotomy for vaginal approach a. Upper – flank or kidney incision – runs parallel to 12th rib Foley muscle splitting incision – oblique cut below 12th rib b. Middle – same as upper, but extended into RLQ of abdomen c. Lower-Foley muscle splitting incision Gibson – (hockeystick) modified flank incision from clost to ilium and just below umbilicus to the spine to just above symphysis pubis Lumbodorsal – cuts through lumbodorsal fascia Midline or paramedian (a finger width from midline) – Longitudinal cut straight up from symphysis pubis to just under umbilicus Transverse – transverse suprapubic incision Pericervical or vaginal – incision through vaginal wall for calculi in the lowest portion of ureter (lithotomy position) 4. Bladder and urethra – usually supine position a. Transverse suprapubic – two fingers above symphysis pubis b. Vertical suprapubic – made in midline from just below umbilicus to symphysis pubis 5. Male Reproductive system – usually supine or exaggerated lithotomy position a. Inverted U incision – curved incision just above anal rim b. Vertical or transverse suprapubic COMMON ADRENAL, KIDNEY AND URETERAL PROCEDURES 1. OPEN a. Adrenalectomy – removal of one or both adrenal glands b. Curaneous ureterostomy – Permanent diversion of flow of urine from kidney, via ureter, away from bladder and onto skin of abdomen c. Foley-Y pyeloureteroplasty – combined connection of a redundant renal pelvis with resection of a stenotic area of ureter d. Kidney transplant – transplant of a living or cadaveric donor kidney into recipient’s iliac fossa. Performed to restore renal function for life. e. Nephrectomy – removal of kidney to treat congenital abnormalities, tumors, diseases or injuries to kidney Heminephrectomy – partial excision of kidney Radical nephrectomy – excision kidney, perirenal fat, adrenal gland, Gerota’s capsule and periaortic lymph nodes f. Nephrolithotomy – removal or large intact stone or exploration of calyx g. h. i. j. k. l. m. n. o. p. q. r. s. t. u. Nephrostomy – incision into kidney for temporary or permanent drainage Nephrotomy – incision into kidney Nephroureterectomy – removal of kidney and entire ureter that drains it Pyelolithotomy – removal of stone or stones through opening made in renal pelvis Pyeloplasty – reconstruction of renal pelvis Pyelostomy – incision into renal pelvis for temporary or permanent diversion of urine Pyelotomy – incision into renal pelvis Ureterectomy – complete removal or ureter Ureteroileostomy (ileal conduit) – diversion of ureter into ileal segment Ureterolithotomy – incision into ureter for surgical removal of stone or calculi from kidney, renal pelvis or ureters Ureteroneocystotomy- division of ureter from bladder and reimplantation of ureter into bladder at another site to treat urinary reflux or performed with partial cystectomy Ureteroplasty – reconstruction of the ureter (ureteropelvic junction) Ureterosigmoidostomy – diversion of ureter into a segment of the sigmoid colon Ureterostomy – opening the ureter for continued drainage from it into another part Ureteroureterostomy – division of ureter and reconstruction in continuity with another ureteral segment 2. Closed a. ESWL – Extracorporal shock wave lithotripsy – fragments stones b. Nephroscopy – direct visualization of interior of kidney c. Ureteroscopy – direct visualization of interior of ureter 3. COMMON BLADDER PROCEDURES OPEN: a. Cystotomy – incision into bladder b. Cystolithotomy – incision into bladder to remove stones c. Cystostomy – incision into bladder for continuous drainage d. Cysstectomy – partial or complete removal of bladder e. Bladder neck operation (Y-V plasty) – plastic repair of bladder neck to overcome contracture of the bladder neck caused by primary or secondary stricture CLOSED: a. Cystoscopy – direction visualization of interior of bladder and urinary tract through the urethra 4. COMMON URETHRAL PROCEDURES OPEN: a. Urethral meatotomy – surgically enlarges meatus to provide adequate drainage b. Urethral dilation and internal urethrotomy – gradual dilation and removal of urethral stricture to provide adequate urinary drainage c. Urethroplasty – repair of urethral stricture that fails to respond to intermittent dilation CLOSED: a. Litholapaxy – bladder calculi crushed and removed through urethra b. Urethroscopy – direct visualization of interior of urethra 5. COMMON MALE PROCEDURES OPEN: a. Circumcision – removal of glans penis foreskin b. Epi/Hypospadias repair – repair of chordee (defect in epispadius is on dorsal surface – defect in Hypospadias is on ventral surface c. Orchiectomy – castration or removal of testes d. Orchipexy – surgical intervention to place undescended testes into scrotal sac e. Penile implant – costal cartilage or silastic is used to construct an artifical penis. Performed for post penile amputation or impotency. f. Prostatectomy – excision of prostate Retropubic – abdominal incision in upper surface of prostate for direct open procedure to enucleate Prostatic hypertrophied masses Suprapubic – prostate gland enucleated in open surgery. Wide area of exploration permits treatment of bladder problems as well Radical – enucleation of prostate gland, including bilateral resection of retroperitoneal lymphatic nodes and resection of spermatic vessels on the affected side Perineal – rarely performed. It involves enucleation of neoplasms of the entire prostate gland through a curved incision just above anal margin. This approach offers direct and accurate approach to prostate gland, but there is higher risk of postoperative impotence and urinary incontinence. Testicular torsion repair – twisting that occurs around spermatic cord obstructs blood supply and can lead to necrosis if surgery is not immediate. A small window of time, 4 -6 hours, exists within which the testes can be saved. Orchiectomy will follow if circulation does not improve. Vasectomy – surgery on vas deferens for male sterilization or as preoperative condition to TURP to avoid epididymitis. CLOSED: Transurethral resection – TURP – most common approach – piecemeal resection of prostate gland by means of a resectoscope passed through the urethra and used for moderately enlarged, benign, hypertrophied glands.