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Infant apnea: polygraphic studies and follow-up monitoring
Insights
Unexplained infant apnea is concerning, but clinical and polygraphic findings often lack predictive value for recurrent events or death. Home monitoring may help identify infants at risk for life-threatening apnea.
Area of Science:
- Pediatrics
- Neonatology
- Sleep Medicine
Background:
- Infant apnea poses significant risks, necessitating thorough evaluation.
- Gastroesophageal reflux (GER) and subtle neurological issues are common in affected infants.
Purpose of the Study:
- To evaluate clinical, polygraphic, and home monitoring findings in infants with unexplained, life-threatening apnea.
- To determine the predictive value of these assessments for recurrent apnea and mortality.
Main Methods:
- Clinical assessment including history, esophagram, and neurological examination.
- Extended polygraphic sleep recordings (8-12 hours) with EEG and cardiorespiratory monitoring.
- pH monitoring during sleep studies and subsequent home monitoring or follow-up.
Main Results:
- Gastroesophageal reflux (GER) was prevalent but did not correlate with apnea severity or outcome.
- Subtle EEG and REM abnormalities were detected but were not predictive of recurrent apnea or death.
- Home monitoring appeared useful in identifying infants at risk for recurrent life-threatening apnea.
Conclusions:
- Sophisticated polygraphic studies may reveal subtle abnormalities but lack predictive power for infant apnea outcomes.
- Home monitoring offers a safeguard by detecting infants susceptible to recurrent, life-threatening apneic episodes.
Abstract:
Twenty-six infants with unexplained and apparently life-threatening apnea were evaluated clinically, underwent eight- or 12-hour polygraphic recordings during sleep, and were then observed on home monitors. The one exception was an infant who was treated with theophylline and not monitored at home. Clinical evaluation revealed a history of vomiting in 19 infants, gastroesophageal reflux (GER) on esophagram in 19, and subtle neurologic abnormalities in ten. Polygraphic studies revealed questionable EEG abnormalities in nine infants, abnormal rapid eye movement (REM) time in four, prolonged apnea in one, and increased frequency of brief mixed (central and obstructive) and obstructive apneas in five. Of the 11 infants who underwent pH monitoring during their polygraphic sleep studies, seven had at least one recorded episode of GER, but the episodes were not accompanied by apnea or bradycardia. Thirteen infants had a subsequent episode of apnea that required stimulation, and in eight infants, cardiopulmonary resuscitation was given. There was two deaths. Two infants subsequently developed seizure disorders. Three of the five infants who underwent surgical fundoplication had recurrent apneic episodes. GER commonly occurred in these infant apnea patients but did not correlate with the clinical outcome. Although subtle abnormalities may be detected by sophisticated polygraphic monitoring studies, they are not predictive of recurrent apnea or death. Home monitoring may be useful in detecting the infant at risk for recurrent life-threatening apnea and in providing some safeguard for that infant.