2-29-08 anatomy notes

2-29-08 anatomy notes - anatomy notes 1 Circulatory System...

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2-29-08 anatomy notes 1. Circulatory System a. Cardiovascular System i. Electrocardiogram (EKG) 1. Valve-diagnostic tool for detecting abnormalities related to HR and conduction of action potentials through the heart a. Normal HR: 70-80 beats/minute b. Arrhythmias-any variations in rhythm of the heart i. Alterations in SA Node Activity 1. Bradychardia-decreased heart rate<60 beats/minute a. Occurrence i. Trained athletes at rest ii. Sleep (increased vagal stimulation to heart) iii. Untreated myxedema (form of hypothyroidism) iv. Excessive use of beta blockers: drugs that affect the SA Node 2. Tachycardia-increased heart rate>100 beats/minute a. Occurrence i. Exercise-NORMAL ii. Hypotension (low bp)-heart increases rate beats/minute to bring bp back to normal level iii. Hemorrhagic Anemia-loss of blood and lack of oxygenation iv. High fever due to infection-incr. body temp and temp of SA Node v. Anti-cholingeric Drugs-an excess causes heart rate to speed up vi. Adrenergic Drugs- increase HR by
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speeding up activity of SA Node vii. Caffeine and Nicotine-excessive use increases HR; 1 cigarette can put a person into tachycardia ii. Ectopic Foci (small hypercitable regions of atria or ventricles that become abnormal pacemakers 1. Causes a.
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