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 |
Ultrasound Findings
| Sign | Meaning |
|---|---|
| Noncompressible blind ended tube | Suggestive |
| Diameter greater than typical threshold | Suggestive |
| Appendicolith or periappendiceal fluid | Complicated disease |
Pharmacology
| Medication | Mechanism | Onset | Role in Therapy | Limitations |
|---|---|---|---|---|
| Ceftriaxone + metronidazole | Cephalosporin + nitroimidazole | Hours | Peri-op/complicated cases | Allergy; disulfiram-like (metro); pediatric dosing/contra nuances |
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
Communicate with surgeons about clinical probability. Avoid delay in unstable patients needing surgery.