Abstract

Apnea of infancy (AOI) and subsequent siblings of SIDS victims (SS- SIDS) have abnormalities in control of sleep and breathing which may be important in sudden infant death syndrome (SIDS). A normal defense mechanism which terminates apnea during sleep is arousal. A majority of AOI and SS-SIDS infants have an abnormal hypoxic arousal response (HAR). This abnormal defense mechanism may prevent the infant from terminating a hypoxic event, or apnea, during sleep. Two hypotheses for the abnormal HAR are the focus of this research. Hypothesis 1: The abnormal HAR in AOI and SS-SIDS is due to a test this, control, AOI, and SS-SIDS infants, 30-50 per group, and 1-6 months, will be studied. HAR will be tested by having the infant breathe P1O2 80 mm Hg until arousal or for 3 minutes. Arousal responses to sensory stimuli (sound, light) will be tested by randomly presenting computer generate burst of white noise and light flashes to the sleeping infants. Arousal to temperature will be tested by having infants sleep on a cooling blanket while changing the temperature 5 C above and below thermal neutrality. Sleep records will be scored for sleep and respiratory events by technicians blinded to the pattern of stimuli. Events and stimuli will be correlated. If the abnormal HAR in AOI and SS-SIDS is due to a generalized arousal deficit, infants with abnormal HAR should have decreased arousal to sensory stimuli. Hypothesis 2: The abnormal HAR in AOI and SS-SIDS is due to habituation to chronic episodic hypoxia. To study this, the above infants will have continuous recordings of respirations, ECG, and arterial oxygen saturation (SaO2) by pulse oximetry performed overnight, fo. 3 nights. Time with SaO2 less that 95%, 90%,80%, and 70% will be calculated. Recordings will be repeated during an upper respiratory infection. If the abnormal HAR is due to habituation, then infants with an abnormal HAR should have more frequent or severe dasaturations than those with normal HAR or than controls.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Project (R01)
Project #
1R01HD022696-01A1
Application #
3322480
Study Section
Human Embryology and Development Subcommittee 2 (HED)
Project Start
1989-01-01
Project End
1991-12-31
Budget Start
1989-01-01
Budget End
1989-12-31
Support Year
1
Fiscal Year
1989
Total Cost
Indirect Cost

  Institution

Name
Children's Hospital of Los Angeles
Department
Type
DUNS #
094878337
City
Los Angeles
State
CA
Country
United States
Zip Code
90027

  Publications

Aljadeff, G; Gozal, D; Bailey-Wahl, S L et al. (1996) Effects of overnight supplemental oxygen in obstructive sleep apnea in children. Am J Respir Crit Care Med 153:51-5
Arens, R; Gozal, D; Burrell, B C et al. (1996) Arousal and cardiorespiratory responses to hypoxia in Prader-Willi syndrome. Am J Respir Crit Care Med 153:283-7
Gozal, D; Marcus, C L; Ward, S L et al. (1996) Ventilatory responses to passive leg motion in children with congenital central hypoventilation syndrome. Am J Respir Crit Care Med 153:761-8
Livingston, F R; Arens, R; Bailey, S L et al. (1995) Hypercapnic arousal responses in Prader-Willi syndrome. Chest 108:1627-31
Marcus, C L; Glomb, W B; Basinski, D J et al. (1994) Developmental pattern of hypercapnic and hypoxic ventilatory responses from childhood to adulthood. J Appl Physiol 76:314-20
Gozal, D; Arens, R; Omlin, K J et al. (1994) Absent peripheral chemosensitivity in Prader-Willi syndrome. J Appl Physiol 77:2231-6
Gozal, D; Lorey, F W; Chandler, D et al. (1994) Incidence of sudden infant death syndrome in infants with sickle cell trait. J Pediatr 124:211-4
Arens, R; Gozal, D; Omlin, K J et al. (1994) Hypoxic and hypercapnic ventilatory responses in Prader-Willi syndrome. J Appl Physiol 77:2224-30
Arens, R; Gozal, D; Williams, J C et al. (1993) Recurrent apparent life-threatening events during infancy: a manifestation of inborn errors of metabolism. J Pediatr 123:415-8
Paton, J Y; Swaminathan, S; Sargent, C W et al. (1993) Ventilatory response to exercise in children with congenital central hypoventilation syndrome. Am Rev Respir Dis 147:1185-91

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