LIST OF ANSWERS TO THE QUESTIONS PERFUSIONIST IS FREQUENTLY ASKED
(by Dmitriy Usenko, First Edition)
Q: Why is arterial line blood so dark?
A: Most of oxygen is already trapped in oxygenator by erythrocytes mitochondria for the synthesis of new hemoglobin molecules.
Q: Why do we have hemolysis?
A: This is a peroxide hemolysis due to activation of free radical processes and reduced activity of erythrocytes catalase.
Q: Why blood pressure is so low?
A: Blood pressure is only a conditional determinant of blood flow driving force, and doesn’t fully characterizes oxygen delivery to the tissues.
Q: Why heart activity is preserved, although we are delivering cardioplegia for almost two minutes?
A: Despite we’ve achieved inactivation of rapid calcium channels, slow calcium channels are still working.
Q: Why do pump suckers work so badly?
A: There is an inhibition of blood flow due to the forces of molecular attraction between the blood and the suction tubing wall.
Q: Why the patient is still cold, although we’ve been rewarming for more than an hour?
A: During the roller pump rotations a large kinetic energy has been communicated to patient’s molecules, and now it is transferred to the environment in the form of heat.
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