Registered Cardiovascular Invasive Specialist (RCIS) Practice Test

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Prepare for the Registered Cardiovascular Invasive Specialist (RCIS) Exam. Utilize flashcards and multiple-choice questions with detailed explanations. Ace your exam with confidence!

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Calculate the regurgitant fraction for a patient with a thermal CO of 4.1L/min and an angiographic CO of 5.4L/min.

The correct answer is: 24%

To determine the regurgitant fraction, one starts by understanding the relationship between the thermal and angiographic cardiac outputs. The thermal cardiac output (CO) reflects the volume of blood effectively pumped by the heart, while the angiographic cardiac output indicates the total volume of blood the heart would ideally pump without any regurgitation. The regurgitant fraction is calculated using the formula: Regurgitant Fraction = (Angiographic CO - Thermal CO) / Angiographic CO × 100% Substituting the provided values into this formula: 1. Calculate the difference between the angiographic and thermal cardiac output: Angiographic CO - Thermal CO = 5.4 L/min - 4.1 L/min = 1.3 L/min 2. Next, divide this difference by the angiographic cardiac output: 1.3 L/min / 5.4 L/min = 0.2407 (approximately) 3. Finally, multiply by 100 to convert to a percentage: 0.2407 × 100% = 24.07% Rounding this value gives the regurgitant fraction as approximately 24%. This aligns with the choice that states 24%, making it the correct answer.