iHuman Case Study – Appendicitis

The differential list is supplied, which shifts the work from generating it to justifying each entry and then excluding it. Appendicitis, acute pancreatitis, peptic ulcer disease and small bowel obstruction all present with abdominal pain and each is distinguished by features the case either contains or does not: the migration of pain from periumbilical to right lower quadrant and anorexia point toward appendicitis; epigastric pain radiating to the back with elevated lipase points toward pancreatitis; pain related to meals with a history of anti-inflammatory use points toward ulcer disease; and colicky pain with vomiting, distension and absent flatus points toward obstruction. Say why each was considered and what excluded it, since a differential without exclusions is a list rather than reasoning. Working the list this way also produces the supporting findings the second question asks for, since what excludes one diagnosis frequently supports another. A differential without exclusions is a list rather than reasoning.

The third question is about examination technique and it rewards precision. Auscultation comes before palpation in the abdomen, which is the reverse of the usual sequence and the reason is that palpation alters bowel sounds; normal bowel sounds are irregular gurgles several times a minute in all quadrants, while high-pitched tinkling and rushes suggest obstruction and true absence requires several minutes of listening before it can be called. On palpation, a soft abdomen tender only on deep palpation is different from involuntary guarding and rebound tenderness, which indicate peritoneal irritation and change the urgency. Naming the classical localising signs, and noting that each has modest sensitivity on its own, is what makes the answer clinical rather than a recitation. Finish by saying which findings would change your management rather than only your diagnosis. The classical signs each carry modest sensitivity alone, which is why they are read together.