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Hyperventilation syndrome: an elegant but scientifically untenable concept
1Department of Medical Psychology, Academic Medical Centre, AZ Amsterdam, Netherlands.
The Netherlands Journal of Medicine
|January 1, 1997
Summary
Hyperventilation syndrome (HVS) is a questionable diagnosis. Current evidence suggests hyperventilation is not a primary cause of symptoms and breathing retraining benefits may not stem from reduced hyperventilation.
Area of Science:
- Psychosomatic Medicine
- Respiratory Physiology
- Clinical Psychology
Background:
- Hyperventilation syndrome (HVS) has been widely accepted as a cause of somatic and psychological symptoms.
- The 'vicious circle' model of HVS has guided therapeutic interventions with reported benefits.
Purpose of the Study:
- To critically evaluate the validity of hyperventilation as a symptom-producing mechanism in HVS.
- To reassess the diagnostic and therapeutic implications of the HVS model.
Main Methods:
- Review of diagnostic test validity (hyperventilation provocation test).
- Analysis of ambulatory monitoring studies of pCO2 during real-life symptom attacks.
- Evaluation of outcome studies for breathing retraining therapies.
Main Results:
- The hyperventilation provocation test shows limited diagnostic validity.
- Ambulant monitoring reveals minimal pCO2 changes during most spontaneous symptom episodes.
- Therapeutic benefits of breathing retraining are likely not due to reduced hyperventilation.
Conclusions:
- The concept of hyperventilation syndrome (HVS) as a primary cause of symptoms is not supported by current evidence.
- The diagnosis of HVS should be avoided in clinical practice.
- Alternative explanations for somatic and psychological symptoms should be considered.