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Ventilatory response to CO2 during exercise remains profoundly low in patients with Congenital Central Hypoventilation Syndrome, with no significant difference from resting values.

In 10 patients with CCHS, the ventilatory response to CO2 during exercise was 2.27 mL/min/mmHg/kg, which was not significantly different from the resting value of 1.56 mL/min/mmHg/kg (p=0.85). Both values were markedly lower than the reference value in healthy children (34.6 mL/min/mmHg/kg), indicating persistent impairment of CO2-driven ventilatory control despite increased metabolic demand.

Last updated: Aug 4, 2026β€’0 RCTsβ€’πŸ“– Read as article β†’

Evidence Score

Evidence Score32/100
Human RCTβ˜†β˜†β˜†β˜†β˜†
Meta-analysisβ˜†β˜†β˜†β˜†β˜†
Mechanismβ˜…β˜…β˜…β˜…β˜…
Safetyβ˜…β˜…β˜…β˜…β˜†
Confidencelow

Study Evidence

Study 1. Ventilatory Response to CO2 During Exercise in Patients With Congenital Central Hypoventilation Syndrome.

observational

Ikeda K, Hasegawa H, Yamada Y, Wasa M, Kanabuchi S Β· Pediatric pulmonology (2026)

Participants: N/A
Duration: Single exercise test session
Intervention: Cardiopulmonary exercise test using a stepwise incremental treadmill protocol with breath-by-breath respiratory gas analysis, terminated when end-tidal CO2 increased by at least 2% (15.2 mmHg) from baseline.
Outcome: Ventilatory response to CO2 (VRCO2) calculated as Ξ”minute volume/Ξ”end-tidal CO2/body weight (mL/min/mmHg/kg), along with SpO2 and EtCO2 changes during exercise.
Effect Size: N/A
Population: 10 patients with genetically confirmed Congenital Central Hypoventilation Syndrome (CCHS), median age 13.5 years (IQR 12.3-15.5).

Result:

PubMed: 42530439DOI: 10.1002/ppul.71767

Mechanism Graph

Central chemoreceptor dysfunction in CCHS impairs detection of CO2 changes
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During exercise, metabolic demand increases CO2 production
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Normal compensatory increase in ventilation fails to occur
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Result: Persistent hypoventilation with elevated EtCO2 and decreased SpO2 during exercise

Limitations

  • ⚠Small sample size (n=10) limits generalizability
  • ⚠No direct comparison with healthy control group; reference values from literature used

Frequently Asked Questions

What is Congenital Central Hypoventilation Syndrome (CCHS)?β–Ό

CCHS is a rare genetic disorder characterized by a markedly impaired ventilatory response to CO2 due to central chemoreceptor dysfunction, leading to inadequate breathing, especially during sleep and exercise.

How was ventilatory response measured in this study?β–Ό

Ventilatory response to CO2 (VRCO2) was calculated as the change in minute volume divided by the change in end-tidal CO2, normalized by body weight (mL/min/mmHg/kg), during a treadmill exercise test and at rest using the CO2 rebreathing method.

Did patients with CCHS experience any symptoms during exercise?β–Ό

No patients reported dyspnea, and no serious adverse events occurred during the exercise test, despite objective evidence of hypoventilation.

What is the clinical implication of this study?β–Ό

The findings underscore the importance of objective physiological assessment (e.g., CPET) rather than relying on subjective symptoms to guide exercise recommendations in CCHS patients.

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References

  1. 1.Ikeda K, Hasegawa H, Yamada Y, Wasa M, Kanabuchi S. "Ventilatory Response to CO2 During Exercise in Patients With Congenital Central Hypoventilation Syndrome.." Pediatric pulmonology, 2026. PMID: 42530439 DOI: 10.1002/ppul.71767
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