Related Experiment Videos
Hypercapnic arousal responses in Prader-Willi syndrome
F R Livingston1, R Arens, S L Bailey
1Division of Neonatology and Pediatric Pulmonology, Childrens Hospital of Los Angeles, University of Southern California School of Medicine 90027, USA.
Chest
|December 1, 1995
Summary
Individuals with Prader-Willi syndrome (PWS) exhibit elevated arousal thresholds to hypercapnia during sleep. This finding suggests abnormal peripheral chemoreceptor function, potentially worsening sleep-disordered breathing in PWS patients.
Area of Science:
- Neurology
- Sleep Medicine
- Genetics
Background:
- Prader-Willi syndrome (PWS) involves hypothalamic dysfunction, including hyperphagia and growth hormone deficiency.
- PWS patients often experience sleep-disordered breathing and blunted ventilatory responses to hypercapnia.
- Abnormal peripheral chemoreceptor function is suspected in PWS, impacting respiratory control.
Purpose of the Study:
- To investigate hypercapnic arousal responses in individuals with Prader-Willi syndrome.
- To determine if arousal thresholds to elevated carbon dioxide levels differ between PWS subjects and controls.
Main Methods:
- Ten nonobese children and adults with PWS and nine control subjects participated.
- Hypercapnic challenges were administered during stage 3/4 non-rapid eye movement sleep.
- Arousal thresholds, baseline end-tidal CO2, and central apneas were measured.
Main Results:
- PWS subjects demonstrated significantly higher arousal thresholds to hypercapnia compared to controls (53 vs. 46 mm Hg).
- PWS subjects exhibited higher baseline end-tidal CO2 levels (42 vs. 38 mm Hg).
- A greater frequency of central apneas was observed in PWS subjects (1.5 vs. 0.1 per hour).
Conclusions:
- Elevated hypercapnic arousal thresholds are present in individuals with Prader-Willi syndrome.
- These findings support the hypothesis of abnormal peripheral chemoreceptor function in PWS.
- Abnormal arousal responses may exacerbate sleep-disordered breathing in Prader-Willi syndrome patients.