Which of the following is the most likely complication of patient-controlled analgesia?

Question

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Patient-controlled analgesia (PCA) is the self-administration of pain-relieving medications (typically opiates and opioids) by patients, for example after painful or invasive procedures or surgeries. Patients tend to use PCA appropriately, but on occasion, overuse of analgesic medications causes a decreased level of consciousness, with sedation and hypoventilation. These complications of PCA can be limited, if not entirely avoided, with lock-out features and other safeguards.

Which of the Following Is the Most Likely Complication of Patient-Controlled