Examkin

Question

Difficulty: Very hardUrologic Surgery

A 29-year-old male with a history of sickle cell trait presents to the emergency department with a painful, rigid erection that has persisted for 8 hours. He denies any trauma or use of erectile dysfunction medications. On physical examination, the corpora cavernosa are tense and tender, while the glans penis and corpus spongiosum remain flaccid. A dorsal penile nerve block is performed for local anesthesia. Cavernosal blood gas analysis reveals a pO2\text{pO}_2 of 18 mmHg18\text{ mmHg}, pCO2\text{pCO}_2 of 88 mmHg88\text{ mmHg}, and pH\text{pH} of 7.057.05. Assuming the patient's condition remains refractory to each successive intervention, arrange the following management steps in the correct standard-of-care escalation sequence.

  1. 1Corporal aspiration and normal saline irrigation
  2. 2Intracavernosal injection of phenylephrine
  3. 3Creation of a distal corporoglans shunt
  4. 4Creation of a proximal cavernosal-spongiosal shunt

Answer

The correct escalation sequence for refractory ischemic priapism is: Corporal aspiration and irrigation, followed by intracavernosal phenylephrine, followed by a distal corporoglans shunt, and finally a proximal cavernosal-spongiosal shunt.
Ischemic priapism is a urologic emergency representing a closed compartment syndrome of the corpora cavernosa, which can lead to irreversible fibrosis and impotence if untreated. The management algorithm dictates a strict step-wise escalation from least invasive to most invasive procedures. After achieving local anesthesia via a penile nerve block, the first therapeutic step is mechanical decompression via corporal aspiration and normal saline irrigation. If detumescence is not achieved, pharmacological therapy with intracavernosal alpha-1 agonists (e.g., phenylephrine) is utilized. Failure of conservative measures mandates surgical shunting to restore venous outflow. A distal corporoglans shunt is the initial surgical choice due to its simpler technique and lower complication rate. If the distal shunt fails to relieve the ischemia, a proximal cavernosal-spongiosal shunt is performed.

Step-by-Step Solution

1
Diagnose the subtype of priapism using cavernosal blood gas.
The blood gas reveals severe hypoxia, hypercarbia, and acidosis, confirming ischemic (low-flow) priapism.
Differentiation from non-ischemic (high-flow) priapism is crucial as treatments differ entirely; ischemic priapism is a compartment syndrome requiring emergent decompression.
2
Initiate first-line conservative mechanical therapy.
Corporal aspiration and normal saline irrigation is performed.
Evacuating the stagnant, deoxygenated blood is the most immediate and least invasive way to relieve compartment pressure.
3
Escalate to pharmacological intervention.
Intracavernosal phenylephrine is administered.
Alpha-1 agonism forces cavernosal smooth muscle contraction, restricting arterial inflow and maximizing venous outflow to achieve detumescence.
4
Proceed to surgical management if conservative measures fail.
A distal corporoglans shunt is performed before attempting a proximal shunt.
Distal shunts (e.g., Winter, Ebbehøj, Al-Ghorab) are less invasive and have a significantly lower morbidity profile than proximal shunts (e.g., Quackels).

Key Concept

Step-wise escalation algorithm for the management of ischemic priapism
Estimated Time:1m 30s
Rate this question

Topics

Urologic Surgery

More questions from this topic