Diagnosis of Gastric Outlet Obstruction

Clinical Examination

• The American College of Radiology recommends inspecting for visible epigastric distension, which may be progressive in onset, particularly in malignancy-related gastric outlet obstruction 1
• The World Journal of Emergency Surgery suggests assessing the patient's general appearance, including facial expression, skin color and temperature, and mental status, as these may indicate critical conditions such as hypovolemic shock from prolonged vomiting 2
• The World Journal of Emergency Surgery recommends examining for signs of dehydration, including dry mucous membranes, poor skin turgor, and sunken eyes 2
• The American College of Radiology suggests palpating the epigastrium for a palpable mass, which may indicate gastric malignancy as the underlying cause 1
• The World Journal of Emergency Surgery recommends checking for peritoneal signs, such as guarding, rigidity, and rebound tenderness, as their presence indicates ischemia and/or perforation requiring emergent surgical exploration 2
• The World Journal of Emergency Surgery suggests auscultating for high-pitched or tinkling bowel sounds, which may be present early in obstruction 2
• The World Journal of Emergency Surgery recommends performing digital rectal examination to detect blood or a rectal mass that might suggest colorectal malignancy as a cause of distal obstruction 2
• The World Journal of Emergency Surgery suggests assessing vital signs carefully, including tachycardia, tachypnea, cool extremities, mottled or cyanotic skin, slow capillary refill, and oliguria, which indicate shock and require immediate intervention 2
• The World Journal of Emergency Surgery recommends checking for fever, which may indicate complications such as perforation or ischemia 3
• The American College of Radiology suggests that a negative abdominal examination does not rule out gastric outlet obstruction, and clinical suspicion should prompt imaging with CT abdomen and pelvis with IV contrast and neutral oral contrast 1
• The World Journal of Emergency Surgery recommends being aware that normal vital signs and absence of peritoneal signs do not exclude ischemia, as laboratory markers like elevated lactate and leukocytosis may be more sensitive 4

Diagnostic Approach in Gastric Outlet Obstruction

Imaging and Diagnostic Accuracy

• The American College of Radiology recommends CT abdomen and pelvis with IV contrast, which has a diagnostic accuracy of over 90% for detecting gastric outlet obstruction 5