Genitourinary & Renal Emergencies
Comprehensive emergency urology and nephrology: testicular torsion salvage windows and manual 'open book' detorsion, ischemic vs non-ischemic priapism aspiration and phenylephrine protocols, Fournier gangrene surgical recognition, and complicated obstructive pyelonephritis.
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Testicular torsion is a surgical emergency with a 6-hour salvage window. Do NOT delay urologic consultation for ultrasound if high clinical suspicion exists. Attempt manual 'open book' detorsion (medial to lateral rotation). Ischemic priapism requires immediate dorsal penile nerve block, corporal aspiration of dark deoxygenated blood, and intracavernosal phenylephrine injections (100–500 mcg q3–5min). Fournier gangrene is a surgical emergency requiring immediate broad-spectrum antibiotics (Vancomycin + Pip-Tazo) and emergent operative debridement.
Testicular torsion results from twisting of the spermatic cord, obstructing venous outflow followed by arterial inflow, leading to acute testicular ischemia. The 'bell-clapper' deformity (inappropriate high insertion of the tunica vaginalis) allows the testis to rotate freely within the scrotum. The testicular salvage rate is > 90% if detorsion occurs within 6 hours of pain onset, dropping to 50% at 12 hours, and < 10% after 24 hours.
| Diagnostic Feature | Testicular Torsion (Surgical Emergency) | Acute Epididymitis (Medical) | Torsion of Appendix Testis (Benign) |
|---|---|---|---|
| Onset of Pain | Sudden, severe, explosive scrotal/lower quadrant pain; nausea and vomiting common | Gradual, progressive scrotal pain over days; dysuria, fever common | Subacute, mild-to-moderate upper pole scrotal pain; no systemic symptoms |
| Physical Examination | High-riding, horizontally oriented testis; exquisitely tender, swollen hemi-scrotum | Tender epididymis localized posterolateral to testis; normal vertical lie | Focal tender nodule at superior pole of testis; 'BLUE DOT SIGN' visible through skin (20%) |
| Cremasteric Reflex | ABSENT (stroke inner thigh; ipsilateral testis fails to elevate; sensitivity 99%) | PRESENT (normal elevation of testis) | PRESENT (normal elevation of testis) |
| Prehn's Sign | Negative (elevation of scrotum does NOT relieve pain) | Positive (elevation of scrotum may relieve pain; UNRELIABLE) | Negative / Not applicable |
| Color Doppler Ultrasound | Absence or reduction of intratesticular blood flow; twisted spermatic cord ('whirlpool sign') | Hypervascularity ('hyperemic flow') in enlarged epididymis/testis | Normal intratesticular blood flow; avascular nodule at superior pole |
Manual 'Open-Book' Detorsion Technique: While the operating room is being mobilized, attempt immediate manual bedside detorsion. Two-thirds of torsions rotate inward (medially). Stand at the patient's feet and rotate the affected testis from MEDIAL TO LATERAL (like opening a book): for the right testis, rotate counter-clockwise; for the left testis, rotate clockwise. The cord may be twisted 180 to 720 degrees (requiring 1 to 3 full rotations). Successful detorsion is marked by immediate relief of pain, return of normal vertical anatomical lie, and restoration of color flow on bedside Doppler. Even with successful manual detorsion, operative bilateral orchiopexy remains mandatory.
Priapism is a persistent, painful erection unrelated to sexual stimulation lasting > 4 hours. It is divided into two pathophysiologically distinct entities:
| Diagnostic Parameter | Ischemic Priapism (Low-Flow - MEDICAL EMERGENCY) | Non-Ischemic Priapism (High-Flow - Non-Emergency) |
|---|---|---|
| Pathophysiologic Mechanism | Compartment syndrome of the penis: Venous outflow occlusion leads to stasis, ischemia, acidosis, and cavernosal fibrosis | Unregulated arterial inflow due to fistulous connection (penile or perineal trauma / straddle injury) |
| Clinical Presentation | EXQUISITELY PAINFUL; rigid corpora cavernosa with flaccid glans penis and corpus spongiosum | Mildly painful or painless; semi-rigid, tumescent erection |
| Cavernosal Blood Gas (CBG) | DARK, THICK, deoxygenated blood: pH < 7.25, pO2 < 30 mmHg, pCO2 > 60 mmHg | BRIGHT RED, oxygenated blood: pH 7.40, pO2 > 90 mmHg, pCO2 < 40 mmHg |
| Etiologic Triggers | Sickle cell disease, medications (trazodone, PDE-5 inhibitors, antipsychotics), cocaine | Blunt perineal or penile trauma lacerating the cavernosal artery |
| Emergency Management | Dorsal penile nerve block -> Aspiration of stagnant blood -> Intracavernosal Phenylephrine injection | Urologic follow-up; angiography with selective embolization or conservative observation |
- Ischemic Priapism Aspiration Protocol: Perform dorsal penile nerve block or ring block with 1% lidocaine (WITHOUT epinephrine). Insert a 19G or 21G butterfly needle at the 2 o'clock or 10 o'clock position of the proximal penis into the corpus cavernosum (avoiding the dorsal neurovascular bundle at 12 o'clock and the urethra at 6 o'clock). Aspirate 20–30 mL of dark, clotted blood until bright red arterial blood appears.
- Intracavernosal Phenylephrine Injections: If detumescence is not achieved with aspiration alone, inject Phenylephrine (pure alpha-1 agonist). Dilute 1 mL of phenylephrine (10 mg/mL) into 100 mL normal saline to yield a 100 mcg/mL solution. Inject 1–2 mL (100–200 mcg) into the corpus cavernosum every 3 to 5 minutes (maximum total dose 1,000 mcg). Monitor blood pressure and heart rate continuously.
Fournier's gangrene is a rapidly progressive polymicrobial necrotizing fasciitis of the perineal, perianal, and genital regions. It carries a mortality rate of 20–40%. Early diagnosis is challenging because cutaneous skin changes significantly underestimate the extent of deep fascial necrosis.
| Phase | Clinical Sign | Pathologic Significance | Emergency Action |
|---|---|---|---|
| Early Phase | Perineal or scrotal pain out of proportion to exam; erythema, mild edema, fever, tachycardia | Bacterial invasion along Buck's, Colles', and Scarpa's fascial planes | Maintain high index of suspicion in diabetics, alcoholics, and immunocompromised patients. |
| Late Phase | Subcutaneous crepitus, hemorrhagic bullae, foul-smelling 'dishwater' discharge, dusky gray necrotic skin, septic shock | Endarteritis obliterans causing microvascular thrombosis and cutaneous infarction | IMMEDIATE SURGICAL DEBRIDEMENT. Medical resuscitation without surgery is 100% fatal. |
| Antimicrobial Regimen | Triple-coverage broad-spectrum antibiotics | Covers MRSA, Gram-negatives (Pseudomonas), and anaerobes | Vancomycin (15–20 mg/kg IV) + Piperacillin-Tazobactam (4.5g IV) + Clindamycin (900 mg IV q8h to halt toxin production). |
| Diagnostic Imaging | Bedside Ultrasound or CT Abdomen/Pelvis with IV contrast | Soft tissue gas (dirty shadowing / hyperechoic foci with reverberation artifact) in scrotal wall or perineum | Do NOT delay surgical consultation to obtain CT imaging if physical signs or crepitus are present. |
While 90% of kidney stones < 5 mm pass spontaneously with supportive care (hydration, NSAIDs, alpha-blockers), obstructive nephrolithiasis with concurrent urinary tract infection is a urologic emergency. An infected obstructed renal pelvis becomes a closed-space abscess under high pressure, rapidly seeding bacteria into the systemic circulation and causing fatal urosepsis.
- The Red Flag Triad: Acute flank pain (renal colic) + Fever / Rigors (> 38.0°C) + Pyuria or bacteriuria on urinalysis.
- Diagnostic Imaging: Non-contrast CT Abdomen and Pelvis (or bedside renal POCUS showing moderate-to-severe hydronephrosis with ureteral stone).
- Emergency Management: Immediate broad-spectrum IV antibiotics (Cefepime 2g IV or Piperacillin-Tazobactam 4.5g IV), aggressive balanced crystalloid resuscitation, and EMERGENT UROLOGIC CONSULTATION for surgical decompression via retrograde ureteral stent placement or percutaneous nephrostomy (PCN) tube.
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