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7 Cards in this Set
- Front
- Back
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PR interval a) measured from b) Normal |
a) P to beginning of QRS complex b) 3-5 squares = 120-220ms |
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QRS complex a) normal duration b) what does QRS complex represent? |
a) 120 ms (3 small squares) b) depolarisation of the ventricles |
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Qt interval a) varies with b) prolonged in c) longer than ..,.. may lead to a ventricular tachycardia |
a) heart rate b) Electrolyte abnormalities, with some drugs c) >450 ms |
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First degree heart block: a) on ECG b) means c) causes |
a) prolonged PR interval (>5 small squares) b) some delay in conduction along the pathway c) may be a sign of coronary artery disease, acute rheuimatic carditis, digoxin toxicity or electrolyte disturbances |
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Second degree heart block: a) Mobitz type 1 - wenckelbach b) mobitz type 2 c) 2:1 heart block d) 3:1 heart block e) 4:1 heart block |
a) progressive lengthening of the PR interval, one non conducted p wave (no qrs following it), next conducted beat has a shorter PR interval b) PR interval of the beats is constant, one P wave is not followed by a QRS complex c/d/e) Alternate conducted and non conducted atrial beats |
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Third degree heart block= complete heart block a) what b) appearence |
a) atrial contractions is normal but no beats are conducted to the ventricles - ventricles are excited by an escape mechanism from a depolarising focus in the ventricular muscle b) no relationship between p waves and qrs complexes, abnormally shaped qrs complexes |
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vsxcz |
zcxv |
