Key Points
- Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
- Use system-specific risk tools to guide testing and disposition.
- Order high-yield tests first; escalate imaging when indicated.
- Start evidence-based initial therapy and reassess frequently.
Algorithm
- Primary survey and vitals; IV access and monitors.
- Focused history/physical; identify red flags and likely etiologies.
- Order system-appropriate labs and imaging (see Investigations).
- Initiate guideline-based empiric therapy (see Pharmacology).
- Reassess response; arrange consultation and definitive management.
Clinical Synopsis & Reasoning
Appendicitis typically presents with periumbilical pain migrating to the RLQ, anorexia, and fever, with leukocytosis; ultrasound or CT confirms diagnosis. Consider mimics (gastroenteritis, ovarian torsion, mesenteric adenitis) and perforation risk when symptoms are prolonged or systemic toxicity is present. Risk scores (Alvarado, AIR) support decision‑making and imaging selection, particularly in pregnancy and pediatrics.
Treatment Strategy & Disposition
Uncomplicated disease is treated with early appendectomy or, in selected cases, antibiotics with shared decision‑making about recurrence risk. Perforation with abscess may warrant antibiotics and interval appendectomy after drainage. Provide peri‑operative antibiotics, analgesia, and VTE prophylaxis per risk. Most patients go to surgical service; admit when complicated or with comorbidities requiring monitoring.
Epidemiology / Risk Factors
- Risk factors vary by condition and patient profile
Investigations
| Test | Role / Rationale | Typical Findings | Notes |
|---|---|---|---|
| CBC | Baseline hematology | Abnormal counts | |
| BMP | Electrolytes/renal | Derangements |
Alvarado Score (Abbrev.)
| Feature | Points |
|---|---|
| Migration to RLQ | 1 |
| Anorexia | 1 |
| Rebound tenderness | 1 |
| Fever | 1 |
| Leukocytosis | 2 |
| Neutrophilia | 1 |
Pharmacology
| Medication | Mechanism | Onset | Role in Therapy | Limitations |
|---|---|---|---|---|
| Ceftriaxone + metronidazole | Cephalosporin + nitroimidazole | Hours | Peri-op/complicated cases | Allergy; disulfiram-like (metro) |
Prognosis / Complications
- Prognosis depends on severity, comorbidities, and timeliness of care
Patient Education / Counseling
- Explain red flags and when to seek emergent care.
- Reinforce medication adherence and follow-up plan.
Notes
Discuss recurrence risk with nonoperative approach. Consider perforation/gangrene if toxic or with mass—manage with source control and antibiotics.
References
Meet MDSteps: Smarter USMLE® Prep
MDSteps streamlines your study with an adaptive QBank (19,000+ high-yield MCQs across all 3 Steps), full CCS case simulations for Step 3 with live vitals and timed orders, and an exam-readiness dashboard that turns practice into insight. Build mastery by system and discipline, auto-create missed-item decks (Anki-exportable), and keep momentum with pacing guidance, trend lines, and suggested next sessions—so every block moves you closer to test-day confidence.
Compared with staples like UWorld and AMBOSS, MDSteps aims to give you the best of both worlds: exam-style practice that adapts to you, plus real-time analytics and a full CCS runner—all in one place. If you want targeted, exam-relevant reps with feedback that actually changes how you study, MDSteps is built for you.
Eplore MDSteps