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Questions and Answers
common causes of tachycardias?
common causes of tachycardias?
1- after-polarisation; abnormally high Ca++>trains of APs. often causes ectopic beats.
2- re-entry: impulse re-excites previously active tissue>AP circulation. often associated with damaged heart tissue. 3- ectopic pacemaker activity; excessive automaticity/over activity of nodes or outside nodes.
how can re-entry cause tachycardia/arrhythmias
how can re-entry cause tachycardia/arrhythmias
AP encounters a region of the myocardium in refractory state>AP travels around the refractory cells via an alternative pathway and activate them via this "backpropagation"> refractory cells recover and depolarise out of sync>trigger additional contractions>arrhythmias.
whats an example of re-entry
whats an example of re-entry
wolfe-parkinson-white syndrome.
in Wolfe-prakinson-white-syndrome, there's an accessory electrical pathway bypassing AV node.
what can this cause and whats the treatment?
in Wolfe-prakinson-white-syndrome, there's an accessory electrical pathway bypassing AV node.
what can this cause and whats the treatment?
the abnormal automaticity is usually caused by
the abnormal automaticity is usually caused by
classification of drugs to treat tachycardias.
classification of drugs to treat tachycardias.
how do class I anti-arrhythmias drugs function?
how do class I anti-arrhythmias drugs function?
adverse effects of class I drugs?
adverse effects of class I drugs?
why at low heart rate, class 1 drugs show minimal effect?
why at low heart rate, class 1 drugs show minimal effect?
examples of class 1a drugs?
examples of class 1a drugs?
