NURS 3000H Lecture Notes - Lecture 3: Sinus Bradycardia, Sinus Rhythm, Vagus Nerve
31 Oct 2018
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Absolute bradycardia: conduction pathway is the same as sinus rhythm but sa node fires at a rate less than. Relative bradycardia: hr that is less than expected for the patie(cid:374)t"s co(cid:374)ditio(cid:374), causing symptoms. Discharge rate increased from sinus node because of vagal inhibition or sympathetic stimulation. Contraction originating from an ectopic focus in one atrium in a location other than the sinus node. May be normal in aerobically trained athletes and others during sleep. Also occurs in response to ca(cid:396)otid (cid:373)assage, valsalva"s manoeuvre, hypothermia, increased intraocular pressure, increased vagal tone, and administration of parasympathomimetic drugs. Disease states associated with sinus bradycardia: hypothyroidism, increased intracranial pressure, obstructive jaundice, and inferior wall mi. Associated with physiological and psychological stressors like exercise, fever, pain, hypotension, hypovolemia, anemia, hypoxia, hypoglycemia, mi, hf, hyperthyroidism, anxiety and fear. Epinephrine, ne, atropine, caffeine, theophylline, nifedipine or hydralazine. In normal hear heart, pac can result from emotional stress, physical fatigue, or use of caffeine, tobacco, or alcohol.
