A 72-year-old patient with a history of chronic constipation presents to the emergency department with severe left lower quadrant abdominal pain, fever of 103.0°F (39.4°C), and vomiting. The nurse suspects acute diverticulitis. What is the most important safety measure the nurse should implement immediately?

Keeping the patient NPO is critical in acute diverticulitis to prevent bowel perforation and allow bowel rest. Other options (enema, high-fiber diet, heat) can worsen inflammation or mask complications.

Correct Answer: 2. Keep the patient NPO (nothing by mouth)

Clinical Reasoning and Safety Rationale

The patient’s presentation—severe left lower quadrant pain, high fever of 103.0°F (39.4°C), and vomiting—is highly suggestive of acute diverticulitis. In the context of an acute abdomen, the immediate safety priority is to rest the bowel and prepare for potential surgical or interventional treatment. The foundational principle is that any patient with an acute abdomen should be kept NPO until a definitive diagnosis and treatment plan are established . This prevents further stimulation of the inflamed bowel and avoids catastrophic complications if emergency surgery is required.

Why the Other Options Are Unsafe

- Option 1 (Administer a Fleet enema): This is contraindicated. In acute diverticulitis, the bowel wall is inflamed and friable due to micro- or macro-perforation. Increasing intraluminal pressure with an enema can cause a contained perforation to rupture, leading to generalized peritonitis. The source material emphasizes that the acute abdomen is a life-threatening entity requiring immediate diagnostic evaluation, not blind interventions that increase risk .
- Option 3 (Encourage increased fluid intake and high-fiber diet): While a high-fiber diet is a preventive strategy for chronic diverticulosis, it is harmful during an acute inflammatory episode. Fiber increases bowel motility and bulk, which aggravates the inflamed, narrowed colonic segment. The patient is also vomiting, making oral intake unsafe.
- Option 4 (Apply heat to the abdomen): Applying heat may seem like a comfort measure, but it can mask the progression of symptoms and does not address the underlying pathology. More critically, if a perforation or abscess is present, heat application could theoretically promote vasodilation and spread of infection. The priority is to stabilize the patient for diagnostic imaging, not to apply local treatments that obscure the clinical picture.

Pathophysiological and Clinical Correlation

The acute abdomen, as described in the supporting evidence, is characterized by the sudden onset of maximally intense abdominal pain, often with guarding and impaired general well-being . In diverticulitis, a micro-perforation of a diverticulum leads to localized inflammation and infection. The patient’s progressive, constant, cramping pain rated 8/10 and systemic signs of fever and vomiting indicate a significant inflammatory response. The source confirms that 15-20% of emergency room patients with acute abdominal pain require interventional or surgical treatment . Keeping the patient NPO is a non-negotiable first step in the structured diagnostic and treatment pathway, ensuring the patient is immediately ready for potential surgery or procedures without the risk of aspiration or further bowel contamination.