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RCP113 U5 Q&A
Cardiac Unit Q&A
Question | Answer |
---|---|
What does an Inotropic drug do? | It influences the contractility of the heart. |
What does a Chronotropic drug do? | It influences the rate of the heart. |
What is Ejection Fraction? | The percentage of end diastolic volume that is ejected with each beat. Normal EF is 65-70% |
What is cardiac preload? | Tension (from blood in the ventricle) on the cardiac muscle as it begins to contract. |
What is cardiac afterload? | The amount of resistance the heart must pump against. Systemic Vascular Resistance (blood pressure) is the key factor in afterload. |
What is Pulmonary Vascular Resistance? | The resistance the right ventricle must pump against to provide flow through the pulmonary circuit. |
What is the cardiac result of an Alpha Blocker? | Vasodilation-Alpha Blockers block vasoconstriction |
What is the cardiac result of a Beta Blocker? | Decreases heart rate and contractility. *Also blocks bronchodilation |
What is the result of a Vasopressor? | Vasoconstriction/Increased blood pressure |
What is the result of a Vasodilator? | Decreased blood pressure |
How do you calculate Cardiac output? | CO= HR x Stroke Volume Normal SV: 60-130ml/beat Normal CO: 4-8lpm |
How do you calculate Cardiac Index? | CO/Body Surface Area Normal: 2.5-4lpm/m² |
What three factors influence Stroke Volume? | Fiber stretch(preload) Contractility Arterial pressure(afterload) |
How do you define Cardiac Flutter? | Atrial beats >200bpm |
How do you define Cardiac Fibrillation? | Chaotic rhythm of any part of the heart. |
What is Asystole? | Cardiac standstill |