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Hemodynamic response to respiratory challenges in panic disorder
J M Martinez1, J D Coplan, S T Browne
1Biological Studies Unit, New York State Psychiatric Institute, Columbia University, New York 10032, USA.
Journal of Psychosomatic Research
|March 4, 1998
Summary
Panic disorder patients exhibit heightened blood pressure responses during room air hyperventilation challenges. This suggests a potential subgroup with hyperactive vascular systems, leading to increased vasoconstriction and blood pressure.
Area of Science:
- Cardiology
- Psychiatry
- Physiology
Background:
- Panic disorder is characterized by recurrent, unexpected panic attacks.
- The physiological responses during panic attacks, particularly hemodynamic changes, require further elucidation.
Purpose of the Study:
- To compare the hemodynamic responses of panic disorder patients and normal controls during various respiratory challenges.
- To investigate the relationship between panic attacks and specific physiological changes.
Main Methods:
- Recruited panic disorder patients and healthy controls.
- Administered respiratory challenges: room air hyperventilation, 5% CO2, and 7% CO2 breathing.
- Monitored blood pressure and pulse rate at baseline and during challenges, with blinded assessment of panic attacks.
Main Results:
- Panic disorder patients who experienced panic during room air hyperventilation showed significantly greater increases in systolic and diastolic blood pressure compared to non-panicking patients and controls.
- No significant blood pressure differences were observed during 5% or 7% CO2 challenges.
- The patient group exhibited higher pulse rates across challenges.
Conclusions:
- Room air hyperventilation may trigger significant blood pressure increases in some panic disorder patients.
- A subset of panic disorder patients might possess a hyperactive vascular response to hypocapnia, leading to exaggerated vasoconstriction and blood pressure elevation.