HE435 Lecture Notes - Lecture 13: Atrial Flutter, Cardiac Arrhythmia, Atrioventricular Node
Document Summary
Sinus node abnormalities: brachycardia, regular but slow hr, less than 60 bpm, results from increased blank outflow (pns stimulation, tachycardia, regular rapid (hr100-160 bpm, sms stimulation, fever, exercise, compensation for low bv. Atrial conduction abnormalities: premature atrial contractions (pac, extra contraction or ectopic beats of atria. Interfere w/ timing of next beat: atrial flutter, hr 160-350 bpm, av node delays conduction, slower ventricular rate. Insufficiency, incompetence: there could also be a mixed issue, single or different disease processes, one may cause the other. What about an exercise prescription: despite this evidence, only 62% patients are referred to a cardiac rehab program (doll et al. 2015 jama: reflects lack of clinician enthusiasm for these programs, available evidence should prompt clinicians to strongly recommend low and moderate intensity exercise training. Change from inactive to mild or moderately active yields large risk reduction. Further increasing the amount of pa from moderately active produces smaller risk reductions.
