PCCN Cardiac Review

Calculate the cardiac output for a pt with a HR of 70 and a SV of 65 ml. Correct Answers HR X SV=CO 70 X 65= 4550 4.6 L/min Calculate the cardiac output for a pt with a HR of 70 and a SV of 65 ml. HR X SV=CO Correct Answers HR X SV=CO 70 X 65= 4550 4.6 L/min What % of the cardiac cycle is provided by the atrial kick? • 15% • 20% • 30% • 35% Correct Answers20% Atrial kick is a term that represents the amount of the total CO that is supplied via atrial contraction. If the pt has a condition or dysrhythmia that impairs or eliminates the atrial contraction, the pt may be compromised. Atrial Kick Correct Answers Atrial kick is a term that represents the amount of the total CO that is supplied via atrial contraction. A normal value for an EF would be? • 65% • 40% • 30% • 25% Correct Answers 65% The EF should be more than 50%. It represents the amount of blood ejected from the left ventricle compared to the total amount available, expressed as a %. An EF of 35% or less indicates a problem with contractility, outflow or filling. EXA: If the ventricle contains 90ml of blood and 50mls are ejected, the amount would be expressed as a %, in this case 55%. A 67 year old male is admitted with chest pain after collapsing at home. He is arguing with his wife that he should not be admitted because he "just over did it" while working in the world. Lee's wife states to you that his chest pain is more frequent, severe and prolonged than before. You should anticipate what diagnosis? • Exertional angina • Unstable angina • Variant angina • Stable angina Correct Answers UNSTABLE ANGINA The change in quality, frequency, and duration indicates UNSTABLE ANGINA and may indicate that the pt is at increased risk for an MI. This pt should be closely monitored for EKG changes and rhythm disturbances. Pt/ family teaching should begin on how to identify an MI and basic CPR. Stroke Volume is comprised of which of the following factors? • Blood volume, viscosity, impedance • Cardiac output, HR, compliance • Contractility, preload, afterload • Compliance, impedance, HR Correct Answers Contractility, preload and afterload A reflex tachycardia caused by the stretch of the right atrial receptors is known as the ____ • Herring-Sines law • Renin-angiotensin system • Starling's law • Bainbridge reflex Correct Answers BAINBRIDGE REFLEX It is believed that this reflex exists to speed up the HR if the right side becomes overloaded, thereby helping equalize pressures on both sides Diastole comprises what & of the cardiac cycle? • ½ • 2/3 • ¼ • 1/3 Correct Answers2/3 Some people that the heart is virtually static during diastole. During this period, the cardiac vessels and chambers fill—a process that takes up 2/3s of the time necessary to complete the cardiac cycle What is the MAP (mean arterial pressure) for pt: BP 120/70 HR 80 Correct AnswersMAP=2(DBP) + (SBP)/3 MAP=2(70) + 120/3 MAP=260/3 MAP=86.6 Pts should maintain a MAP of at least 60 to ensure adequate perfusion to the brain and kidneys. What is the MAP (mean arterial pressure) for pt: BP 120/70 HR 80 MAP=2(DBP) + (SBP)/3 Correct AnswersMAP=2(70) + 120/3 MAP=260/3 MAP=86.6 Pts should maintain a MAP of at least 60 to ensure adequate perfusion to the brain and kidneys.