Clinical features

• any tongue biting
• post-collapse disorientation
• 'blueness' if collapse observed ^c  

Why?

Tongue biting, disorientation and cyanosis make a collapse likely to be a  seizure

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
Patients with recurrent collapse- possible seizure c (pre-test probability: 9%)	seizure (composite reference standard)	tongue biting	7.33 (2.30 to 23.3)	42%	0.62 (0.48 to 0.81)	6%
		witnessed disorientation after the event	5.03 (2.74 to 9.24)	33%	0.18 (0.08 to 0.37)	1.7%
		witnessed 'blueness' during event	15.5 (2.1 to 114)	61%	0.72 (0.59 to 0.88)	6.6%