A 2-year-old child is brought to the emergency department after passing a massive volume of painless, dark red stool at home. On examination, the patient appears pale, mottled, and lethargic. Vital signs reveal a heart rate of 165/min, respiratory rate of 28/min, and blood pressure of 70/40 mmHg. Capillary refill time is prolonged at 4 seconds. The abdomen is soft, non-distended, and non-tender to palpation. Arrange the following medical interventions in the most appropriate chronological sequence for the evaluation and management of this patient.
- 1Establish dual peripheral intravenous catheters and rapidly infuse an isotonic crystalloid bolus.
- 2Transfuse cross-matched or type O-negative packed red blood cells.
- 3Administer an intravenous histamine-2 receptor antagonist or proton pump inhibitor.
- 4Perform a technetium-99m pertechnetate scintigraphy scan.
- 5Proceed with surgical resection of the affected ileal segment.
Answer
The correct sequence prioritizes immediate hemodynamic stabilization with crystalloids and blood products, followed by pharmacological enhancement of the diagnostic imaging, execution of the technetium-99m pertechnetate scan, and finally, definitive surgical resection.
The clinical presentation of painless, massive lower gastrointestinal bleeding in a toddler is classic for a bleeding Meckel diverticulum. The management of any acute hemorrhage mandates immediate stabilization of the airway, breathing, and circulation. Therefore, securing large-bore IV access and administering isotonic crystalloids is the first step. Because this patient is in decompensated shock (hypotension, severe tachycardia, poor perfusion), blood transfusion is required if crystalloids do not immediately reverse the shock state. Once hemodynamically stable, the diagnosis must be confirmed. The technetium-99m pertechnetate scan (Meckel scan) detects ectopic gastric mucosa. To maximize the sensitivity of this scan, H2-receptor antagonists or proton pump inhibitors are administered beforehand to prevent the release of the radiotracer into the bowel lumen, keeping it concentrated in the ectopic tissue. Finally, after the diagnosis and location are confirmed, the patient undergoes surgical resection to provide definitive treatment.
Step-by-Step Solution
Key Concept
Management of hemorrhagic shock secondary to a bleeding Meckel diverticulum, emphasizing the sequence of resuscitation prior to pharmacologically enhanced diagnostic imaging.