Apr 7 - Cardiovascular Disorders Part II

Apr 7 - Cardiovascular Disorders Part II - Cardiovascular...

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Click to edit Master subtitle style 2/16/11 Cardiovascular Disorders Part II Sabra H. Smith, MS, RN NURS 216 Spring 2010
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2/16/11 Blood Pressure definitions BP is measured in an artery, usually the brachial Measured in mmHg BP is the pressure inside an artery caused by the movement of blood through it BP = CO * PVR
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2/16/11 Short-Term Regulation of BP Neural -baroreceptors: pressure sensors, in carotids and aortic arch -chemoreceptors: chemical sensors, in carotids and aortic arch Humoral -RAA System (renin is released by the KIDNEYS, NOT the brain –correct Mar 24 renal intro notes)
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2/16/11 RAA System Renin release stimulated by: -increased SNS activity -decreased BP, ECH volume, or ECF Na concentration Renin changes to angiotensin I in the blood, then into angiotensin II in the lungs Angiotensin II effects: -vasoconstriction of arterioles (short-term control)
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2/16/11 Long-Term Regulation of BP Mainly by the kidneys via their control of ECF volume ECF excess causes higher rates of Na and H2O excretion ECF deficit causes lower rates of Na and H2O excretion Most blood pressure medications work through changing kidney function
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Essential Hypertension Aka “primary” HTN, accounts for 90-95% of HTN Normal BP = <120 and <80 HTN = > 160 or > 100 Biological risk factors:
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Apr 7 - Cardiovascular Disorders Part II - Cardiovascular...

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