IRAD Risk Score (Aortic Dissection) Calculator

Predisposing Conditions: Marfan or Connective Tissue Disorder Enter 1 for Yes, 0 for No

Predisposing Conditions: Aortic Aneurysm or Aortic Valve Disease Enter 1 for Yes, 0 for No

Predisposing Conditions: Hypertension Enter 1 for Yes, 0 for No

Pain Features: Abrupt Onset Enter 1 for Yes, 0 for No

Pain Features: Severe Pain (maximal from onset) Enter 1 for Yes, 0 for No

Pain Features: Migrating Pain Enter 1 for Yes, 0 for No

Physical Findings: Pulse Deficit or BP Differential Enter 1 for Yes, 0 for No

Physical Findings: Neurologic Deficit Enter 1 for Yes, 0 for No

Physical Findings: Hypotension/Shock/Tamponade Enter 1 for Yes, 0 for No

IRAD Risk Score (Aortic Dissection): Explanation and Clinical Context
IRAD Risk Score is a validated clinical tool to assess the probability of acute aortic dissection (AAD) in patients presenting to emergency departments.
It is based on three domains: predisposing conditions (such as Marfan syndrome, aortic aneurysm, or chronic hypertension), pain characteristics (abrupt onset, severe intensity, and migrating nature), and physical examination findings (pulse deficits, neurologic deficits, hypotension/shock/tamponade).
The score ranges from 0 to 9, stratifying patients into low, intermediate, or high risk for AAD, guiding the need for immediate imaging like CT angiography or TEE.
This scoring system facilitates rapid triage and clinical decision-making but does not replace definitive diagnostic tests.

Reference:
Rogers AM, Hermann LK, Booher AM, et al. "Sensitivity of the International Registry of Acute Aortic Dissection (IRAD) Risk Score in Identifying Acute Aortic Dissection." Circulation. 2011;123:2213-2218. doi:10.1161/CIRCULATIONAHA.110.006579
Nienaber CA, Eagle KA. "Aortic Dissection: New Frontiers in Diagnosis and Management." Circulation. 2003;108:628-635. doi:10.1161/01.CIR.0000083517.64260.9F