Chapter 43.pe - Chapter43 DrugsAffectingBloodPressure

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Chapter 43 Drugs Affecting Blood Pressure
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Elements Determining Blood Pressure Heart rate Stroke volume Amount of blood that is pumped out of the  ventricle with each heartbeat Total peripheral resistance Resistance of the muscular arteries to the blood  being pumped through them
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Control of Blood Pressure
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Categories Rating the  Severity of Hypertension
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Risks for Coronary Artery Disease  Related to Hypertension Thickening of the heart muscle  Increased pressure generated by the muscle on  contraction  Increased workload on the heart 
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Conditions Related to  Untreated Hypertension CAD and cardiac death Stroke Renal failure Loss of vision
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Potential Causes of Hypotensive States Heart muscle is damaged and unable to pump effectively Severe blood loss; blood volume drops dramatically Extreme stress when body’s level of norepinephrine is  depleted Body is unable to respond to stimuli to raise blood  pressure
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Stepped Care Approach to  Treating Hypertension Step 1: lifestyle modifications are instituted  Step 2: drug therapy is added if the measures in step 1  are insufficient Step 3: drug dose or class may be changed or another  drug added if the patient’s response is inadequate Step 4: includes all of the above measures with the  addition of more antihypertensive agents until blood  pressure is controlled
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Types of Drugs Used to Control  Blood Pressure Diuretic: decreases serum sodium levels and blood volume Beta-blocker: leads to a decrease in heart rate and strength of  contraction as well as vasodilation
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This note was uploaded on 02/19/2011 for the course RNSG 1301 taught by Professor Loftin during the Spring '11 term at Lone Star College.

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Chapter 43.pe - Chapter43 DrugsAffectingBloodPressure

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