BIOL 1260 Lecture 16: Arrhythmia
2 Dec 2016
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Arrhythmia impulse conduction impulses originate regularly at frequency of 60-100 beats/min cardiac arrhythmias. May cause sudden death, syncope, heart failure, dizziness, palpitations, or no symptoms at all. Two main types: bradychardia: heart rate is slow (<60 bpm, tachycardia: heart rate is fast (>100 bpm) Use it to easily calculate hr by counting the number of large squares between r waves abnormal pacemaker: sinus arrhythmias. Supraventricular tachycardia: involving tissue above the ventricles (atrium, av node) Ventricular tachycardia: involving exclusively tissue below the. Atrial fibrillation: up to 500 bpm, irregular uncoordinated contractions, fragmentary: ventricles beat at one fifth the rate of atria but not regular, serious if chronic condition, blood clots anticoagulant therapy. Ventricular tachycardia: >100 bpm impulse is initiated from ventricle: wide qrs, palpitations, faint or unconsciousness, onset of mi lidocaine is first line treatment, cardiovert (conversion to normal rhythm) categories of disturbances. Abnormal impulse generation: delayed after-depolarization, abnormal pacemaker activity. Abnormal impulse conduction: re-entry, heart block automaticity.
