The nurse who is preparing for the return of the patient to the medical-surgical floor after thoracic surgery recognizes that the patient will likely return with a chest drainage system due to:
A) The loss of negative pressure in the chest cavity related to opening the chest
B) The loss of positive pressure in the chest cavity related to opening the chest
C) The introduction of bacteria into the chest cavity related to opening the chest
D) A fluid and electrolyte imbalance related to opening the chest
Ans: A
Feedback: The normal breathing mechanism operates on the principle of negative pressure. Whenever the chest is opened, there is a loss of negative pressure, which can result in the collapse of a lung.
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