Alvarado score: a guide to computed tomography utilization in appendicitis

Area of Science:

• Medical Imaging
• Surgical Diagnostics
• Clinical Decision Support

Background:

• Computed tomography (CT) is valuable for diagnosing appendicitis but not universally required.
• Clinical stratification is essential to identify patients who would benefit from CT evaluation.
• The Alvarado score (AS) can stratify patients with suspected appendicitis for targeted CT use.

Purpose of the Study:

• To evaluate the utility of the Alvarado score (AS) in guiding computed tomography (CT) utilization for suspected appendicitis.
• To propose an objective algorithm using the AS to determine the necessity of CT scans.

Main Methods:

• Retrospective review of medical records for patients with suspected appendicitis over six months.
• Retrospective calculation of the Alvarado score (AS) for each patient.
• Correlation of AS with histological and CT findings, calculating sensitivity, specificity, PPV, and NPV.

Main Results:

• Appendicitis prevalence was 50% in 358 patients; 59.8% underwent CT.
• CT evaluation was associated with a significantly lower negative appendicectomy rate (5.7% vs. 17.9%).
• AS > 3 showed higher sensitivity (95.5%) than CT; AS ≥ 9 demonstrated superior specificity (100%).

Conclusions:

• Patients with an Alvarado score (AS) between 4 and 8 benefit most from CT evaluation in suspected appendicitis.
• An AS-guided management algorithm can optimize the use of CT scans, improving diagnostic efficiency.