Abdominal Pain Evaluation in a 55-Year-Old Female

Immediate Assessment and Differential Diagnosis

The American College of Emergency Physicians recommends assessing hemodynamic stability immediately, checking for tachycardia, hypotension, fever, or signs of shock, which indicate potential bowel ischemia, perforation, or sepsis requiring emergency intervention 1, 2
The World Journal of Emergency Surgery suggests looking for peritoneal signs, such as guarding, rebound tenderness, and rigidity, which suggest perforation or ischemia and mandate urgent surgical consultation 1
Evaluating for obstruction is crucial, as abdominal distension has a positive likelihood ratio of 16.8 for bowel obstruction; assess for colicky pain, vomiting, and absence of flatus 1
Previous abdominal surgery has an 85% sensitivity for adhesive small bowel obstruction, which accounts for 55-75% of small bowel obstructions 1
Weight loss and rectal bleeding are highly suggestive of colorectal cancer, which causes 60% of large bowel obstructions in this age group 1, 3

The World Journal of Emergency Surgery recommends ordering a complete blood count, as leukocytosis >14,000 suggests infection, ischemia, or inflammation; marked elevation indicates potential bowel ischemia 1, 2
A metabolic panel is essential, as low bicarbonate, elevated lactate, and elevated pH indicate intestinal ischemia 1, 2
A pregnancy test is mandatory in all women of reproductive age before imaging, even at age 55 if any possibility of pregnancy 4, 6, 2

The American College of Radiology recommends ultrasonography as the initial imaging of choice for right upper quadrant pain, with 81% sensitivity and 83% specificity for cholecystitis 6, 2
CT abdomen and pelvis with IV contrast is the preferred initial study for right or left lower quadrant pain, with >95% sensitivity for appendicitis and high accuracy for diverticulitis 6, 2
CT abdomen and pelvis with IV contrast is the imaging modality of choice for diffuse or nonlocalized abdominal pain, changing diagnosis in 49% of cases and management in 42% of patients 8, 9, 7, 2

The World Journal of Emergency Surgery recommends immediate IV crystalloid resuscitation for hemodynamically unstable patients 1, 2
Emergency surgical consultation is necessary for peritonitis, perforation, or septic shock 1, 2
Supportive care, including IV fluids, antiemetics, and bowel rest, is recommended for stable patients 1
Antibiotics should only be used if infection is suspected, and not as a routine treatment for all abdominal pain 2

The Journal of the American College of Radiology warns against relying on normal laboratory values in elderly patients, as many serious infections present with normal white blood cell counts in this age group 5, 8, 2
Delaying imaging based on clinical impression alone can lead to missed diagnoses, as CT changes diagnosis in approximately 50% of cases with nonspecific pain 8, 7
Overlooking malignancy, such as colorectal cancer, which causes 60% of large bowel obstructions in this age group, is a critical pitfall 1, 3
Forgetting pregnancy testing, even in perimenopausal women, can have catastrophic consequences if ectopic pregnancy is missed 6, 4