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14 Cards in this Set
- Front
- Back
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A.fib
definition |
atrial tachyarrhythmia
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frequency of atrial fibrillation
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most common sustained cardiac arrhythmia
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pathophysiology of atrial fibrillation
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1-initiation
2-maintinance 3-stabilization |
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A.fib initiation pathophysiology
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-- ectopic focus within the :
--pulmonary vein |
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A.fib maintinance pathophysiology
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-- needs multiple re-entrance circles
--circles are varying in location and timing |
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A.fib stabilization (of the rhythm ) pathophysiology
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--by structural & atrial remodelling
--inflammation & fibrosis --CRP & IL-6 are raised with A.fib |
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site of ectopic focus in A.fib in most cases
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pulmonary vein
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associated risk factors for A.fib
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-age
-male sex -HTN -CHF -DM -valcular heart (..mitral stenosis) -previous MI -hyperthyroidism -cardio-thoracic surg |
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% of pt's who develop A.fib after cardiothoracic surg
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20-50 %
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associated risk factors for new-onset A.fib in pt's less than 65 yo
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-Obesity
-Obstructive sleep apnea -hyperthyroidism |
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tests must be done in A.fib
diseases must be excluded |
TSH
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classification/types of atrial fibrilation
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4 forms
............................. 1-first occurrence 2-paroxysmal 3-persistent 4-permenant |
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1-first occurrence A .fib
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-present in 60 % of hospitalized pt's
-high spontaneous conversion rate |
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2-paroxysmal A.fib
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-reccurent form
-each episode lasts for < 7 days -most terminated by 48 hrs |
