Why should morphine be withheld if the patient’s respiratory rate is below 12 breaths per minute?

Why should morphine be withheld if the patient’s respiratory rate is below 12 breaths per minute?

• A. It can cause worsened hypertension
• B. It can cause tachycardia
• C. It can cause hyperglycemia
• D. It can cause respiratory depression

Answer: (D)

Morphine is an opioid that depresses the respiratory center in the brainstem, reducing the body's response to carbon dioxide and slowing breathing. When the respiratory rate drops below about 12 breaths per minute, giving more morphine can worsen hypoventilation and even lead to apnea. That’s why withholding morphine at that point is the safest action to prevent dangerous respiratory depression. If analgesia is still needed, consider delaying the dose until breathing improves, using a smaller dose, or choosing non-opioid or adjuvant options while continuing to monitor respiratory status closely. It's worth noting that the main acute risk here is respiratory depression; other potential opioid effects exist (like sedation or hypotension), but they are not the primary concern in the scenario of a depressed respiratory rate.

Morphine is an opioid that depresses the respiratory center in the brainstem, reducing the body's response to carbon dioxide and slowing breathing. When the respiratory rate drops below about 12 breaths per minute, giving more morphine can worsen hypoventilation and even lead to apnea. That’s why withholding morphine at that point is the safest action to prevent dangerous respiratory depression. If analgesia is still needed, consider delaying the dose until breathing improves, using a smaller dose, or choosing non-opioid or adjuvant options while continuing to monitor respiratory status closely. It's worth noting that the main acute risk here is respiratory depression; other potential opioid effects exist (like sedation or hypotension), but they are not the primary concern in the scenario of a depressed respiratory rate.