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Pathology

Complete AV dissociation, impulses from atria cannot be conducted to ventricles


Aetiology

Drug therapy e.g. beta blockade, fibrosis of conductive tissue, Lyme disease, acute rheumatic fever, aortic valve disease, sarcoidosis, myocarditis, MI, idiopathic


Signs

Bradycardia, hypotension

Symptoms

Can be asymptomatic, SOB, chest pain, pre-syncope/syncope

Investigations

ECG: No association between p-waves and ventricular conduction
Echo: To assess for any structural abnormalities


Treatment

Stop offending drugs
A temporary pacing wire may be required
Long-term PPM    


Prognosis

Untreated at high risk of sudden cardiac death, once treated prognosis is good
Death, injuries from syncope

Key Facts

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Key Images

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Key References

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