All affected Hygroscopic Condenser Anesthesia and Humidifier Breathing Circuits with affected Hygroscopic Condenser Humidifiers are being replaced. The U.S. Meals and Medication Administration has categorized this recall as a Course I recall. FDA defines Class I recalls as ‘a predicament in which there exists a fair probability that the usage of or exposure to the volatile product may cause serious adverse health outcomes or death.’.. Class I recall for Vital Indications HCH/Anesthesia Breathing Circuit In April 2011, Essential Signs Devices, a GE Healthcare Company, initiated a voluntary worldwide field correction of the Essential Signs Hygroscopic Condenser Humidifier /Anesthesia Breathing Circuit.The researchers analyzed data on more than 11,000 children enrolled in the Avon Longitudinal Research of Parents and Children, a project located in the United Kingdom. In response to mailed questionnaires, parents reported their child's snoring and apnea at 18, 30, 42, and 57 weeks of age. For the same time intervals, parents were asked whether their child refused to visit bed also, and whether they regularly woke early, had difficulty sleeping, had nightmares, got up after becoming put to bed, woke in the night, or awakened after a few hours. Children with five or more of these behaviors simultaneously were considered to possess a clinically significant behavioral sleep problem. Among kids with behavioral sleep problems, 26 to 40 % had habitual SDB, peaking at 30 a few months again.