Defibrillator paddles should not be placed over the sternum because bone is not a good Question Blank 1 of 1
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Defibrillator paddles are used to deliver an electric shock to the heart in order to restore a normal rhythm during cardiac arrest. Show more…
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(a) A defibrillator sends a 6.00-A current through the chest of a patient by applying a 10,000-V potential as in the figure below. What is the resistance of the path? (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. Discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance. (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: $P=I^{2} R$ ).
(a) A defibrillator (a device that stores charge on a capacitor used to start the heart beat of a patient under cardiac arrest after suffering irregular heartbeats) sends a 6 A current through the chest of a patient by applying a 9000 V potential as in the figure. What is the resistance of the path (through the wire and the body)? R = kΩ (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. To understand the importance of using the gel, discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance by finding the ratio, P_no-gel / P_gel (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: P = I^2R.) What difficulties arise when no gel is used? a. The voltage is too high for the human body even when the current is the same. b. There is a risk of skin burns because of the high power deposited.
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