Ventilatory response to morphine in young and old subjects

Area of Science:

• Anesthesiology
• Geriatric Medicine
• Pharmacology

Background:

• Opioid analgesics are commonly used for pain management in surgical patients.
• Age-related physiological changes may alter drug responses, particularly respiratory function.

Purpose of the Study:

• To compare the effects of intravenous morphine on ventilation in young and elderly adults.
• To assess age-related differences in respiratory control following opioid administration.

Main Methods:

• Two groups of subjects (young: 28-37 years; old: 65-82 years) received intravenous morphine (10 mg/70 kg).
• Ventilation parameters (minute ventilation, ventilatory frequency, end-tidal carbon dioxide) were measured before and 20 minutes after morphine administration.
• Incidence of apneic or periodic breathing was recorded.

Main Results:

• Both young and old groups showed significant decreases in ventilation and increases in end-tidal carbon dioxide post-morphine.
• No significant differences in the overall ventilatory response to morphine were observed between age groups.
• Older adults experienced more frequent episodes of apnea or periodic breathing compared to younger adults.

Conclusions:

• Intravenous morphine induces comparable respiratory depression in both young and elderly individuals.
• Elderly patients demonstrate a greater susceptibility to altered ventilatory control and breathing irregularities after morphine administration.