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Venepuncture causes rapid rise in plasma ACTH
K Meeran1, A Hattersley, G Mould
1Royal Postgraduate Medical School, Hammersmith Hospital, London.
The British Journal of Clinical Practice
|September 1, 1993
Summary
Venipuncture stress significantly elevates adrenocorticotropin (ACTH) and cortisol levels in sleeping individuals. Difficult blood draws may yield misleading ACTH results, impacting stress response studies.
Area of Science:
- Endocrinology
- Stress Physiology
- Clinical Biochemistry
Background:
- The hypothalamic-pituitary-adrenal (HPA) axis regulates the body's stress response.
- Adrenocorticotropin (ACTH) stimulates cortisol release from the adrenal glands.
- Understanding acute stress responses is crucial for interpreting physiological measurements.
Purpose of the Study:
- To investigate the immediate impact of venipuncture stress on serum cortisol and ACTH levels in sleeping volunteers.
- To determine the time course of hormonal changes following venipuncture.
- To assess the reliability of ACTH measurements in the context of venesection stress.
Main Methods:
- Nine healthy volunteers were monitored while sleeping at midnight.
- Blood samples were collected to measure serum cortisol and ACTH levels before and after a standard venipuncture.
- Plasma ACTH was assessed for changes within 90 seconds, and cortisol within 4 minutes post-venipuncture.
Main Results:
- Plasma ACTH levels increased significantly within 90 seconds in six out of nine volunteers following venipuncture.
- Serum cortisol levels began to rise within 4 minutes after venipuncture.
- In three volunteers, ACTH levels remained undetectable, suggesting variability in response or measurement sensitivity.
Conclusions:
- Venipuncture is a significant acute stressor that rapidly elevates ACTH and cortisol levels.
- The stress response to venesection can be rapid and pronounced, potentially altering baseline hormonal measurements.
- Plasma ACTH measurements following difficult venesections, especially in subjects with poor venous access, may not accurately reflect endogenous ACTH levels.