Clinical features Investigations Therapy Prevention Prognosis

Clinical features Think about cardiac arrhythmias in patients with dizziness or syncope  c Note: Symptoms of dizziness and fainting are common in patients with syncope, but few are associated with arrhythmias (1.0%: 95% CI: 0.49% to 1.5%) c Dizziness and fainting make a major arrhythmia less likely Patient Target Disorder and Reference Standard Diagnostic Test LR+ (95% CI) Post-test Probability LR- (95% CI) Post-test Probability unexplained syncope c (pre-test probability: 9%) major arrhythmia (24 hour ECG) dizziness and fainting 0.25 (0.12 to 0.56) 2% 1.2 (1.1 to 1.2) 10%

Expiry date: July 2004
Levels of Evidence used in grading these guides