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Comparative analysis between available challenge tests in the hyperventilation syndrome.

Angelica Tiotiu1, Iulia Ioan2, Mathias Poussel3

  • 1Department of Pulmonology, University Hospital of Nancy, 9 Rue du Morvan, 54511, Vandoeuvre-lès-Nancy, France; Development, Adaptation and Disadvantage, Cardiorespiratory Regulations and Motor Control (EA 3450 DevAH) Research Unit, University of Lorraine, 9 Avenue de la Forêt de Haye, 54505, Vandoeuvre-lès-Nancy, France.

Respiratory Medicine
|February 20, 2021
PubMed
Summary
This summary is machine-generated.

The hyperventilation provocation test (HVPT) is more effective than the cardiopulmonary exercise test (CPET) for diagnosing hyperventilation syndrome (HVS). Exercise may be a therapeutic approach for HVS, potentially aiding patients with misdiagnosed asthma.

Keywords:
AsthmaErgospirometryHyperventilationHyperventilation provocation testNijmegen questionnaire

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Area of Science:

  • Respiratory Medicine
  • Clinical Psychology

Background:

  • Hyperventilation syndrome (HVS) involves physical and psychological symptoms stemming from prolonged hypocapnia and respiratory alkalosis without organic disease.
  • Diagnosis often relies on subjective symptom reporting and objective ventilatory measures.

Purpose of the Study:

  • To compare the diagnostic utility of the hyperventilation provocation test (HVPT) and cardiopulmonary exercise test (CPET) in patients with HVS.
  • To assess the reproducibility of ventilatory parameters and symptoms during both tests.
  • To identify common etiologies of HVS through systematic evaluation.

Main Methods:

  • Fifty-nine patients meeting Nijmegen's questionnaire criteria for HVS and exhibiting hypocapnia were studied after excluding organic causes.
  • Ventilatory parameters and symptom occurrence were recorded during both HVPT and CPET.
  • Comorbidities, particularly anxiety and asthma, were systematically assessed.

Main Results:

  • The HVPT demonstrated significantly higher symptom reporting (all patients) compared to CPET (14%, p<0.01).
  • While maximal ventilation was similar between tests, PETCO2 significantly decreased during HVPT (to 15 mmHg) but increased during CPET (to 34 mmHg).
  • Anxiety (95%) and asthma (73%) were the most frequent comorbidities; some HVS patients presented with atypical asthma.

Conclusions:

  • HVPT is a superior diagnostic tool for HVS compared to CPET due to better symptom reproducibility.
  • A significant subset of HVS patients may have undiagnosed atypical asthma.
  • Exercise-induced hyperventilation's lack of abnormal PETCO2 reduction suggests exercise could be a therapeutic strategy for HVS.