PCCN Review - Cardiac

Calculate the cardiac output for a pt with a HR of 70 and a SV of 65 ml. Calculate the cardiac output for a pt with a HR of 70 and a SV of 65 ml. HR X SV=CO What % of the cardiac cycle is provided 20% HR X SV=CO 70 X 65= 4550 4.6 L/min HR X SV=CO 70 X 65= 4550 4.6 L/min by the atrial kick? • 15% • 20% • 30% • 35% Atrial Kick A normal value for an EF would be? • 65% • 40% • 30% • 25% A 67 year old male is admitted with chest pain after collapsing at home. He is argu￾ing with his wife that he should not be ad- mitted 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 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 con￾traction, the pt may be compromised. Atrial kick is a term that represents the amount of the total CO that is supplied via atrial contraction. 65% The EF should be more than 50%. It rep￾resents 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%. UNSTABLE ANGINA The change in quality, frequency, and duration indicates UNSTABLE ANGINA and may indicate that the pt is at in- creased risk for an MI. This pt should be PCCN Review - Cardiac 2 / 72 should anticipate what diagnosis? • Exertional angina • Unstable angina • Variant angina • Stable angina Stroke Volume is comprised of which of the following factors? • Blood volume, viscosity, impedance • Cardiac output, HR, compliance • Contractility, preload, afterload • Compliance, impedance, HR 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 Diastole comprises what & of the cardiac cycle? • ½ • 2/3 • ¼ • 1/3 What is the MAP (mean arterial pres- sure) for pt: BP 120/70 HR 80 What is the MAP (mean arterial pres- sure) for pt: BP 120/70 closely monitored for EKG changes and rhythm disturbances. Pt/ family teaching should begin on how to identify an MI and basic CPR. Contractility, preload and afterload 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 2/3 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 com- plete the cardiac cycle MAP=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. MAP=2(70) + 120/3 MAP=260/3 MAP=86.6 Pts should maintain a MAP of at least 60