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A patient is suffering from cardiac arrhythmias. They have atrial fibrillation. Describethe normal conduction pathway of heart, starting with the AV node. On an ECG, how might atrial fibrillations present (or how would an ECG be altered for someone with atrial fibrillations)?

A patient is suffering from cardiac arrhythmias. They have atrial fibrillation. Describethe normal conduction pathway of heart, starting with the AV node. On an ECG, how might atrial fibrillations present (or how would an ECG be altered for someone with atrial fibrillations)?

Human Physiology: From Cells to Systems (MindTap Course List)
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter9: Cardiac Physiology
Section: Chapter Questions
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  1. A patient is suffering from cardiac arrhythmias. They have atrial fibrillation. Describethe normal conduction pathway of heart, starting with the AV node. On an ECG, how might atrial fibrillations present (or how would an ECG be altered for someone with atrial fibrillations)?
  2. A different patient (not the one above!!) had to have Atropine administered, which is a parasympathetic antagonist. FIRST, describe what the parasympathetic system does to the heart, including what neurotransmitter it uses and the mechanism of action on the heart. NEXT, explain the effects atropine would have on the heart and whyone common side effect is dry mouth.
  3. You also tended to a verbose and flamboyantly dressed zookeeper who came in with a gun strapped to his waist (remember, no names! Lawsuits! HIPPA!). He had been mauled by a tiger and an artery had been hit, causing loss of blood. Describethe immediate cardiovascular reflex this patient’s body started to counter the sudden drop in blood volume and the effects that reflex would have on the cardiovascular system.
  4. A common medication for systemic hypertension is beta blockers. Nonselective beta blockers block all types of Beta receptors throughout the body. Explainhow nonselective beta blockers would help reduce blood pressure (include effects in the heart and blood vessels). One side effect though is bronchoconstriction, meaning it is ill advised to prescribe these to asthmatics. Why does this side effect occur? 

 

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