Mastering Heat Exchange in Perfusion Technology
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Questions and Answers

Which mode of heat transfer involves the movement of molecules within fluids?

  • Convection (correct)
  • Diffusion
  • Radiation
  • Conduction
  • Which mode of heat transfer involves the transfer of energy between two objects that are in physical contact?

  • Radiation
  • Convection
  • Conduction (correct)
  • Advection
  • Which mode of heat transfer involves the transfer of energy by the movement of charged particles within the atom?

  • Radiation (correct)
  • Diffusion
  • Conduction
  • Convection
  • Which mode of heat transfer is influenced by the rate of flow and diameter of the channel?

    <p>Convection</p> Signup and view all the answers

    Which factor affects the rate of heat transfer in systems with fluid in motion?

    <p>Flow rate</p> Signup and view all the answers

    Which mode of heat transfer involves the transfer of energy as electromagnetic radiation?

    <p>Radiation</p> Signup and view all the answers

    Which mode of heat transfer involves the random movement of individual particles or molecules?

    <p>Diffusion</p> Signup and view all the answers

    Which mode of heat transfer primarily involves the transfer of heat out of the blood into cooler water in a cooling phase?

    <p>Convection</p> Signup and view all the answers

    Which mode of heat transfer involves the transfer of heat from water back into the blood during active warming?

    <p>Convection</p> Signup and view all the answers

    Which mode of heat transfer involves the transfer of energy between two objects that are not in physical contact?

    <p>Radiation</p> Signup and view all the answers

    Which of the following factors determine the direction and rate of heat movement?

    <p>Gradient, area of interaction, and resistance to movement</p> Signup and view all the answers

    According to Le Chatelier's Principle, what happens to equilibrium when changes in the environment stress it?

    <p>Equilibrium shifts to relieve the stress</p> Signup and view all the answers

    According to Fourier's Law, what is the rate of heat transfer through a particular material proportional to?

    <p>Temperature gradient and area of transfer</p> Signup and view all the answers

    What is the relationship between gas solubility and temperature?

    <p>Gas solubility is inversely proportional to temperature</p> Signup and view all the answers

    What is the purpose of a heat exchanger in the CPB circuit?

    <p>To transfer heat</p> Signup and view all the answers

    Which principle describes the effect on equilibrium due to changes in temperature, pressure, volume, etc.?

    <p>Le Chatelier's Principle</p> Signup and view all the answers

    Which of the following is NOT a factor that determines the direction and rate of heat movement?

    <p>Equilibrium and stress</p> Signup and view all the answers

    What is the relationship between gas solubility and temperature?

    <p>Gas solubility decreases with temperature</p> Signup and view all the answers

    What regulates the transfer of heat based on the properties of the materials involved?

    <p>Gradient, area of interaction, and resistance to movement</p> Signup and view all the answers

    What is the purpose of a heat exchanger in the CPB circuit?

    <p>To transfer heat</p> Signup and view all the answers

    Which material is commonly used for the heat exchanger component of the oxygenator complex?

    <p>Stainless steel</p> Signup and view all the answers

    What is the purpose of the silicone or polymer coating on the blood passage portion of the heat exchanger?

    <p>To prevent coagulation and inflammation</p> Signup and view all the answers

    In most systems of integrated heat exchangers, when does the blood pass through the heat exchanger?

    <p>Before entering the oxygenator compartment</p> Signup and view all the answers

    Why is it recommended to have a maximum temperature gradient of no more than 10°C between the patient's core temperature and the arterial inflow temperature during cooling and warming?

    <p>To prevent gas bubble formation</p> Signup and view all the answers

    What did a 2002 study suggest about rapid rewarming strategies and neurologic outcomes?

    <p>Rapid rewarming potentially contributes to poorer neurologic outcomes</p> Signup and view all the answers

    Why do many practitioners continue to use the generally accepted 4° to 6° temperature gradient during cooling and warming?

    <p>To minimize bypass times</p> Signup and view all the answers

    What is the recommended maximum temperature for the heat exchanger to prevent potential denaturation of proteins in the blood?

    <p>40°C–42°C</p> Signup and view all the answers

    What are heat exchangers used for in cardiac surgery and ECMO?

    <p>To maintain or reach desired temperature</p> Signup and view all the answers

    What is the purpose of heater-cooler devices in relation to heat exchangers?

    <p>To circulate water through the devices</p> Signup and view all the answers

    In what type of circuits are heat exchangers used to deliver cold and warm cardioplegia?

    <p>Cardiopulmonary bypass circuits</p> Signup and view all the answers

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