Effect of aging on cholecystokinin-induced panic

Area of Science:

• Neuroscience
• Gerontology
• Psychiatry

Background:

• Epidemiologic studies indicate a decrease in panic disorder incidence and prevalence in older adults.
• Understanding age-related changes in panic responses is crucial for public health.
• The panicogenic agent cholecystokinin tetrapeptide (CCK-4) is a valuable tool for studying panic responses.

Purpose of the Study:

• To investigate the effect of aging on healthy subjects' responses to cholecystokinin tetrapeptide (CCK-4).
• To determine if age influences sensitivity to a known panic-inducing agent.

Main Methods:

• Double-blind, placebo-controlled study design.
• Involved 80 healthy subjects, divided into two age groups: 20-35 years old (n=40) and 65 years or older (n=40).
• Participants received an intravenous bolus of either 50 micrograms of CCK-4 or normal saline.

Main Results:

• Older subjects (≥65 years) reported significantly fewer and less intense panic symptoms upon CCK-4 administration compared to younger subjects (20-35 years).
• The duration of panic symptoms was shorter in the older group.
• Older subjects exhibited a significantly smaller increase in heart rate following CCK-4 administration.

Conclusions:

• The study demonstrates an age-related difference in responsiveness to the panicogenic agent CCK-4.
• Findings suggest a potential neurobiological mechanism underlying the reduced prevalence of panic disorder in later life.
• Further research is warranted to elucidate the specific mechanisms driving this age-related change in CCK-4 sensitivity.