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Tachyarrhythmias

Clinical features
Investigations
Therapy
Prevention
Prognosis
Clinical features

Look for cannon waves in the jugular vein c

Why?

No cannon waves make a ventricular tachycardia less likely

Patient Target Disorder and
Reference Standard		 Diagnostic Test LR+
(95% CI) 		Post-test Probability LR-
(95% CI) 		Post-test Probability
tachycardia c
(pre-test probability: 50%) 		ventricular tachycardia
(induced rhythm) 		slow independent jugular venous pulse (cannon waves) 3.8
(1.8 to 8.2) 		79% 0.067
(0.0097 to 0.46) 		6%

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

Author   CM   Ball
Reviewer   H   Oral
CAT Writers   CM   Ball , N   Shenker , CJ   Wotton