Panic anxiety and hyperventilation in patients with chest pain: a controlled study

Area of Science:

• Cardiology
• Psychiatry
• Respiratory Medicine

Background:

• Chest pain is a common symptom with various causes, including cardiac and psychological factors.
• Hyperventilation, characterized by hypocapnia (low end-tidal PCO2), can be associated with anxiety and panic disorders.
• Distinguishing between cardiac and psychiatric causes of chest pain is crucial for appropriate patient management.

Purpose of the Study:

• To investigate the relationship between mood disorders, specifically anxiety and panic, and hyperventilation during exercise treadmill testing in patients with chest pain.
• To determine if exercise-induced hyperventilation is more indicative of psychiatric or cardiac conditions in this patient group.

Main Methods:

• Studied 113 chest pain patients and 30 healthy controls undergoing exercise treadmill testing.
• Measured end-tidal PCO2 (PCO2) to assess for hyperventilation (lack of PCO2 rise during exercise).
• Assessed anxiety and panic symptoms using standardized questionnaires and clinical evaluation.

Main Results:

• A subset of 21% of chest pain patients exhibited no normal rise in PCO2 during exercise, indicating hyperventilation.
• These patients with exercise-induced hyperventilation had significantly higher anxiety scores.
• Panic anxiety was more prevalent in patients with hyperventilation compared to those with a normal PCO2 response (42% vs 13%).
• Resting hypocapnia and hyperventilation-related symptoms were more common in patients with panic anxiety.

Conclusions:

• Confirms a significant association between panic anxiety and hyperventilation in patients presenting with chest pain.
• Exercise-induced hyperventilation in chest pain patients is more likely linked to psychiatric disorders than cardiac disease.
• Early identification and treatment of hyperventilation and associated psychiatric conditions can reduce unnecessary cardiac investigations and associated morbidity.