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12 Cards in this Set
- Front
- Back
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Define AFl
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AFl + sinus tachycardia
Atrial rate = 300 2:1 conduction 150bpm |
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What causes AFl?
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Increased automaticity
Circuit re-entry |
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How is AFl characterised?
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Single atrial focus
Supraventricular tachycardia Loss of P wave distinction = saw toothed |
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Do peripheral/ apical pulse rates or rhythms change?
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Not necessarily- rhythm and rate reflects ventricular contractions
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What conditions cause AFl? (9)
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Pericardial disease
Severe mitral valve disease Primary myocardial disease Hyperthyroidism Acute MI COPD After cardiac surgery Associated with secondary heart block Systemic arterial hypoxia |
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Severe mitral valve disease, primary myocardial tissue disease and hyperthyroidism result in what?
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Enlarged atrial tissue and increased atrial pressures
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How is AFl associated with secondary heart block?
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AVN failure resulting in decreased ventricular rate
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What determines the clinical significance of AFl?
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The conduction ratio
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What does the conduction ratio affect?
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Affects the ventricular rate
If ventricular rate is very fast there is decreased ventricular filling time and coronary perfusion |
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What do the effects caused by an increased ventricular rate cause?
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Hypotension
Heart failure Angina Syncope Pulmonary oedema |
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What does the treatment of AFl depend on?
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Duration of arrhythmia (48hrs)
Pre- excitation syndromes Haemodynamically stable |
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How is AFl treated?
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Synchronised cardioversion at the peak of R wave
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