AIMS65 Score Calculator for Upper GI Bleeding Mortality Risk
The AIMS65 score is a simple risk stratification tool for predicting in-hospital mortality in patients presenting with acute upper gastrointestinal bleeding.
About
The AIMS65 score was developed by Saltzman et al. and published in Gastrointestinal Endoscopy in 2011. Derived from a large inpatient database of over 25,000 patients with upper GI bleeding in the United States (from the University HealthSystem Consortium), the score was designed to predict in-hospital mortality. The acronym AIMS65 stands for five independently significant predictors: Albumin <3.0 g/dL, INR >1.5 (international normalized ratio reflecting coagulopathy), altered Mental status (GCS <14 or disorientation), Systolic blood pressure ≤90 mmHg (hemodynamic instability), and age >65 years. Each variable contributes 1 point for a total score of 0-5. In the original validation study, in-hospital mortality rates increased stepwise with score: 0 = 0.3%, 1 = 1.2%, 2 = 4.5%, 3 = 11.0%, 4 = 31.0%, and 5 = 38.5%. The AUROC for predicting mortality was 0.80, demonstrating good discrimination that was similar to or better than more complex scores like Glasgow-Blatchford and Rockall. Importantly, the score uses only five variables that are routinely available at presentation, making it practical for rapid risk assessment in the emergency department.
Formula
Albumin <3.0 g/dL (1) + INR >1.5 (1) + Altered Mental Status (1) + SBP ≤90 mmHg (1) + Age >65 (1)
The AIMS65 score is calculated by summing 1 point for each of five clinical variables available at the time of presentation. Albumin <3.0 g/dL (1 point) reflects chronic illness and malnutrition. INR >1.5 (1 point) indicates coagulopathy, which may be due to liver disease (cirrhosis) or anticoagulant therapy. Altered mental status (1 point) is defined as a Glasgow Coma Scale <14 or any disorientation, reflecting the systemic impact of bleeding or underlying hepatic encephalopathy. Systolic blood pressure ≤90 mmHg (1 point) indicates hemodynamic instability due to active bleeding. Age >65 years (1 point) captures the increased vulnerability of older patients. Total score ranges from 0-5, with in-hospital mortality rising exponentially with each additional point. The score is simple enough to calculate without a calculator and has been externally validated in diverse populations and clinical settings.
Score Interpretation
The AIMS65 score is a widely validated risk stratification tool for upper GI bleeding that provides rapid mortality risk prediction using five routinely available clinical variables. Its primary clinical utility lies in early risk stratification to guide triage decisions (medical ward vs. ICU), urgency of endoscopic intervention, and intensity of resuscitation. Compared to the Glasgow-Blatchford score (which requires multiple lab values and may overestimate risk) and the Rockall score (which requires endoscopic findings), AIMS65 offers simplicity without sacrificing predictive accuracy for mortality. The score performs particularly well for predicting in-hospital mortality (AUROC 0.80) and has been externally validated across diverse populations, including patients on anticoagulation and those with variceal bleeding. The AIMS65 score should be used as part of a comprehensive assessment that includes hemodynamic status, comorbidity burden, and clinical judgment.
Low Mortality (0.3%) — 0–0
Predicted in-hospital mortality: 0.3%. Suitable for standard medical ward.
Management: Standard GI bleed management. Urgent upper endoscopy within 24 hours.
Low-Moderate Mortality (1.2%) — 1–1
Predicted in-hospital mortality: 1.2%. Consider admission for monitoring.
Management: Inpatient admission with monitoring. Urgent endoscopy within 24 hours.
Moderate Mortality (4.5%) — 2–2
Predicted in-hospital mortality: 4.5%. Requires close monitoring.
Management: Inpatient admission. Urgent endoscopy within 12-24 hours. Monitor for rebleeding.
High Mortality (11%) — 3–3
Predicted in-hospital mortality: 11%. ICU admission recommended.
Management: ICU admission. Urgent endoscopy within 12 hours. Prepare blood products. GI and critical care consultation.
Very High Mortality (31-39%) — 4–5
Predicted in-hospital mortality: 31-39%. ICU admission mandatory.
Management: ICU admission mandatory. Emergent endoscopy. Aggressive resuscitation. Multidisciplinary care: GI, critical care, surgery.
Reference Ranges
| Population | Normal Range | Notes |
|---|---|---|
| Acute upper GI bleeding patients | 0-5 points | Score 0: 0.3%, 1: 1.2%, 2: 4.5%, 3: 11%, 4: 31%, 5: 39% in-hospital mortality |
Dr. Khaled Hassan
Dr. Khaled is a cardiology consultant with 20 years of experience in managing cardiovascular patients.
View medical review board & editorial policy →Example Calculation
A 72-year-old man with known cirrhosis (Child-Pugh B) presents to the ED with hematemesis and melena for 1 day. On examination, he is alert and oriented (GCS 15) but tachycardic (HR 105). BP is 88/55 mmHg after initial 500 mL crystalloid bolus. Laboratory studies: albumin 2.4 g/dL, INR 1.8, hemoglobin 8.2 g/dL. AIMS65 calculation: Albumin <3.0 (+1), INR >1.5 (+1), Altered mental status (0 — GCS 15), SBP ≤90 (+1), Age >65 (+1) = Total 4/5 — Very high mortality risk (~31%). The patient is admitted to the ICU, started on IV octreotide and ceftriaxone (for variceal bleeding prophylaxis), transfused with packed RBCs and fresh frozen plasma, and urgent upper endoscopy is performed within 6 hours showing bleeding esophageal varices that are banded successfully.
Related Conditions
Related Medications
Common Mistakes
Using AIMS65 to predict rebleeding rather than mortality
AIMS65 was specifically designed and validated to predict in-hospital mortality in upper GI bleeding. For rebleeding risk prediction, consider the Rockall score after endoscopy.
Applying AIMS65 to lower GI bleeding
AIMS65 was validated for upper GI bleeding. For lower GI bleeding, alternative scores like the Oakland score should be used.
Frequently Asked Questions
How does AIMS65 compare to Glasgow-Blatchford and Rockall?
Should high AIMS65 scores delay endoscopy?
References
- Saltzman JR, Tabak YP, Hyett BH, et al. A simple risk score accurately predicts in-hospital mortality, length of stay, and cost in acute upper GI bleeding. Gastrointest Endosc. 2011;74(6):1215-1224. PubMed
- Robertson M, Majumdar A, Boyapati R, et al. The AIMS65 score compared with the Glasgow-Blatchford and Rockall scores in predicting in-hospital mortality and other outcomes in acute variceal bleeding. Gastroenterology. 2016;150(4):S538. PubMed
- Laine L, Jensen DM. Management of patients with ulcer bleeding. Am J Gastroenterol. 2012;107(3):345-360. PubMed