Practice Test Geeks(CCP) Certified Clinical Perfusionist Practice Test
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Hemodynamic Monitoring During Bypass Flashcards

7 cards from real CCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. During deep hypothermic circulatory arrest (DHCA) preparation, cerebral oximetry bilaterally drops below 50%. The best immediate action is:

    Answer: Increase pump flow and verify head positioning and venous drainage

    A bilateral rSO2 drop below 50% before arrest signals inadequate cerebral perfusion; optimizing pump flow and ensuring unobstructed venous drainage are the first corrective steps.

  2. Which hemodynamic finding is most consistent with cardiac tamponade occurring after separation from CPB?

    Answer: Equalization of diastolic pressures across cardiac chambers

    Tamponade compresses all cardiac chambers equally, causing equalization of CVP, RVDP, PADP, and PAOP — a hallmark diagnostic finding.

  3. A perfusionist monitoring a patient on CPB notes a persistent base excess of –8 mEq/L. After confirming adequate pump flow and SvO2, the most likely additional cause is:

    Answer: Hyperchloremic acidosis from large-volume crystalloid prime

    Large-volume normal saline or crystalloid primes deliver excess chloride, producing a hyperchloremic non-anion-gap metabolic acidosis independent of tissue perfusion.

  4. During pulsatile CPB, which hemodynamic benefit compared to non-pulsatile flow has the most clinical evidence?

    Answer: Reduced systemic vascular resistance and improved microcirculatory flow

    Pulsatile flow is associated with lower SVR, better microcirculatory perfusion, and reduced inflammatory response compared to non-pulsatile CPB in clinical studies.

  5. A perfusionist measures a pump flow of 5.0 L/min in a patient with a BSA of 2.0 m². The calculated cardiac index during CPB is:

    Answer: 2.5 L/min/m²

    Cardiac index = flow / BSA = 5.0 / 2.0 = 2.5 L/min/m², which is within the typical target range of 2.2–2.4 L/min/m² for normothermic CPB.

  6. Venous oxygen saturation (SvO2) rises from 68% to 82% during CPB without a change in pump flow. Which is the most clinically significant cause to investigate?

    Answer: Development of a systemic-to-venous shunt or left-to-right intracardiac shunt

    An unexplained rise in SvO2 at constant pump flow suggests shunted blood bypassing metabolizing tissues, such as a ventricular septal defect or AV fistula recirculating oxygenated blood.

  7. Which monitoring modality provides the most direct assessment of cerebral autoregulation during CPB?

    Answer: Correlation between mean arterial pressure and cerebral oximetry (COx index)

    The cerebral oximetry index (COx), derived from the moving correlation between MAP and rSO2, directly quantifies pressure-passive cerebral flow as a marker of autoregulation integrity.