A 74-year-old woman with a history of atrial fibrillation, noncompliant with her apixaban, presents to the emergency department with sudden-onset, severe periumbilical abdominal pain. Her vital signs show a temperature of 38.4°C (101.1°F), blood pressure of 88/54 mmHg, and heart rate of 122/min. Physical examination reveals a rigid abdomen with diffuse guarding and rebound tenderness. Laboratory studies demonstrate a leukocyte count of 24,500/mm³ and a serum lactate level of 7.2 mmol/L. Arrange the following steps in the most appropriate sequential order for the definitive management of this patient's condition.
- 1Initiation of aggressive fluid resuscitation and intravenous broad-spectrum antibiotics
- 2Performance of an emergent exploratory laparotomy without preoperative advanced imaging
- 3Surgical embolectomy of the superior mesenteric artery to restore vascular inflow
- 4Resection of frankly necrotic and irreversibly infarcted bowel segments
- 5Application of a temporary abdominal closure for a planned second-look laparotomy
Answer
The correct sequence of management is: initiation of fluid resuscitation and antibiotics, followed by emergent exploratory laparotomy, then surgical embolectomy of the superior mesenteric artery, followed by resection of necrotic bowel, and finally temporary abdominal closure for a planned second-look laparotomy.
The optimal management of acute mesenteric ischemia complicated by peritonitis follows a strict physiological and surgical sequence. First, the patient must be stabilized with fluid resuscitation and broad-spectrum antibiotics due to impending or established septic shock. Second, because the patient has peritonitis (rigid abdomen, rebound tenderness) and hemodynamic instability, emergent exploratory laparotomy is indicated without delaying for preoperative imaging like computed tomography angiography. Third, upon entering the abdomen, the paramount surgical principle is to perform revascularization (e.g., superior mesenteric artery embolectomy) prior to any bowel resection. This is critical because restoring perfusion allows reversibly ischemic bowel to regain color and peristalsis, preventing unnecessary resection and minimizing the risk of short bowel syndrome. Fourth, only after blood flow is fully restored should the surgeon resect the segments of bowel that remain frankly necrotic and irreversibly damaged. Finally, because the viability of the remaining bowel can continue to evolve due to reperfusion injury, primary anastomosis is generally avoided; instead, a temporary abdominal closure is applied, and a second-look laparotomy is scheduled for 24 to 48 hours later to reassess the bowel.
Step-by-Step Solution
Key Concept
In the surgical management of acute mesenteric ischemia, revascularization of the ischemic territory must precede resection of necrotic bowel to maximize preservation of viable intestinal length.