Acute Abdomen Quiz

Acute Abdomen: Practice Guide for Exam-Style Questions

The term “acute abdomen” refers to the sudden, severe onset of abdominal pain. It is a common presentation in emergency medicine and requires rapid, accurate assessment to differentiate benign conditions from life-threatening emergencies. Success on exams requires a systematic approach to differential diagnosis based on patient history, physical findings, and key risk factors.

Understanding Pain Location and Radiation

The location of abdominal pain is the single most important clue to the underlying diagnosis. Always consider the anatomical structures within each quadrant. Pain that migrates (like in appendicitis) or radiates (like in pancreatitis or renal colic) provides crucial diagnostic information.

Critical ‘Can’t-Miss’ Diagnoses

Certain conditions are immediately life-threatening and must be ruled out quickly. A high index of suspicion is essential when encountering specific red flags. These diagnoses often present with signs of shock or peritonitis.

• Ruptured Abdominal Aortic Aneurysm (AAA): Classic triad of pain, hypotension, and a pulsatile mass.
• Acute Mesenteric Ischemia: Severe pain that is “out of proportion” to physical exam findings.
• Perforated Viscus: Sudden, severe, diffuse pain with a rigid, board-like abdomen.
• Ruptured Ectopic Pregnancy: Abdominal pain, amenorrhea, and vaginal bleeding in a female of childbearing age.
• Myocardial Infarction: Epigastric pain can be a primary symptom, especially in older or diabetic patients.
• Bowel Obstruction: Presents with colicky pain, vomiting, distention, and obstipation.

Key Physical Exam Maneuvers

Specific physical exam signs can help narrow the differential diagnosis. Understanding how to perform and interpret these maneuvers is vital for clinical scenarios on exams.

• Murphy’s Sign: Inspiratory arrest upon palpation of the right upper quadrant (RUQ); classic for acute cholecystitis.
• McBurney’s Point Tenderness: Maximal tenderness at a point one-third of the distance from the anterior superior iliac spine to the umbilicus; suggests appendicitis.
• Rovsing’s Sign: Pain in the right lower quadrant (RLQ) upon palpation of the left lower quadrant (LLQ); suggests appendicitis.
• Psoas Sign: RLQ pain with passive extension of the right hip; suggests retrocecal appendicitis.
• Obturator Sign: RLQ pain with passive internal rotation of the flexed right hip; suggests pelvic appendicitis.

Common Causes by Quadrant: Right Lower Quadrant (RLQ)

The RLQ is a common site of pain. While appendicitis is the classic cause, other conditions must be considered, particularly in different patient populations.

Common Causes by Quadrant: Left Lower Quadrant (LLQ)

In older adults, the most common cause of LLQ pain is acute diverticulitis. It’s often referred to as “left-sided appendicitis” due to the similar presentation of localized pain, fever, and leukocytosis.

Common Causes by Quadrant: Right Upper Quadrant (RUQ)

Pain in the RUQ is most commonly related to the biliary system. Acute cholecystitis and biliary colic are classic presentations, often precipitated by fatty meals.

Special Populations: The Elderly and Pregnant Patients

Presentations of acute abdomen can be atypical in certain populations. The elderly may have a blunted pain response, less fever, and minimal lab abnormalities, even with serious pathology. In pregnant patients, the enlarging uterus displaces abdominal organs, altering the location of pain for conditions like appendicitis.

Diagnostic Imaging and Lab Workup

Initial labs typically include a CBC, CMP, lipase, and urinalysis. A pregnancy test is mandatory for all females of childbearing age. Imaging choices are guided by the suspected diagnosis; ultrasound is preferred for biliary and gynecologic issues, while CT scan is the workhorse for undifferentiated abdominal pain, appendicitis, and diverticulitis.

Key Takeaways

• Always start with a broad differential diagnosis based on pain location.
• Prioritize ruling out life-threatening conditions like AAA, mesenteric ischemia, and perforation.
• A thorough patient history (including prior surgeries, medications, and social history) is crucial.
• Remember classic presentations: migratory pain in appendicitis, radiation to the back in pancreatitis, and radiation to the groin in renal colic.
• Be aware of atypical presentations in special populations like the elderly.

This content provides a study guide for understanding the differential diagnosis of acute abdominal pain. It is intended for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical concerns.