Evaluation of the Canadian Clinical Practice Guidelines Risk Prediction Tool for Acute Aortic Syndrome: The RIPP Score

Table 2

Characteristics of patients with AAS (acute aortic syndrome) and controls.

Characteristics	N (%)
Risk factors	AAS (N = 379)	Controls (N = 379)
Family history	6 (1.5)	1 (0.2)
Aortic manipulation	1 (0.3)	0
Aortic valve disease	14 (3.7)	0
Known aortic aneurysm	69 (18.2)	2 (0.5)
Known thoracic aortic aneurysm	23 (6)	0
Connective tissue disease	1 (0.2)	0
Pain
Abrupt onset pain	308 (81.2)	50 (13.2)
Tearing/ripping	22 (5.8)	1 (0.26)
Migrating/radiating pain	302 (79.7)	62 (16.4)
Severe	121 (24.6)	117 (23.9)
Physical exam
Hypotension	53 (13.9)	1 (0.3)
New murmur	16 (4.2)	0
Pulse deficit	20 (5.3)	1 (0.3)
Focal neurological deficit	41 (10.8)	0
Bilateral blood pressure differential >20 mmHg	29 (7.6)	2 (0.5)
Impression
Clinical suspicion for an alternative diagnosis	40 (10.6)	113 (29.8)
Investigations
CXR abnormal	51 (13.1)	0