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Radiofrequency - Electromagnetic radiation in the frequency range 3 kilohertz (kHz) to 300 gigahertz (GHz). It is generally considered to include microwaves and radio waves. Microwaves occupy the spectral region between 300 GHz and 300 MHz, while RF or radio waves include 300 MHz to 3 kHz. The primary health effects of radiofrequency energy are considered to be thermal. The absorption of radiofrequency energy varies with frequency.
Radiofrequency (RF) Procedure (Somnoplasty) - A procedure for treating nasal obstruction, snoring and in some cases, sleep apnea. This procedure uses radio wave energy to reduce snoring and the size of a redundant soft palate. These techniques are performed under local anesthesia as an out-patient procedure.
Rapid Eye Movement Sleep (REM Sleep) - See REM Sleep, Sleep Stages.
REM Density - The frequency of eye movements per unit of time during REM sleep.
REM-Associated Disorders - Sleep disturbances that occur in REM sleep.
REM Motor Atonia - The suppression, or paralysis, of voluntary muscles during REM sleep. These muscles become completely flaccid and limp.
REM Sleep (Rapid Eye Movement Sleep) - The sleep stage in which vivid dreaming occurs; identified by the occurrence of rapid eye movements under closed eyelids, motor atonia and low voltage EEG patterns. Also associated with bursts of muscular twitching, irregular breathing, irregular heart rate, and increased autonomic activity.
REM Sleep Behavior Disorder - A disorder in which REM motor atonia is partially or completely absent. People with this disorder are able to move their muscles and act out their dreams. The behaviors may include punching, kicking, leaping and running from the bed.
REM Sleep Episode - The REM sleep portion of a NREM-REM sleep cycle. There are typically 4-6 REM sleep episodes during an entire sleep period. Early episodes may be only several minutes in duration. Later REM episodes are usually longer, lasting 20 to 60 minutes.
REM Sleep Intrusion - A brief interval of REM sleep appearing out of its usual positioning in the NREM sleep cycle.
REM Sleep Latency - The interval from sleep onset to the first appearance of REM sleep.
REM Sleep Onset - The designation for the first epoch of a REM sleep episode.
REM Sleep Percent - The proportion of total sleep time occupied by REM sleep.
REM Sleep Rebound - A compensatory increase in REM sleep following a reduction of REM Sleep Percent. An increase in time, frequency and density of REM sleep episodes.
Respiratory Care Practitioner (RCP) - A licensed health care professional specifically trained in cardiopulmonary assessment, diagnostics, therapy administration, and patient education, including the identification and treatment of sleep disorders.
Respiratory Disturbance Index (RDI)(Apnea/Hypopnea Index) - The frequency of abnormal respiratory events per hour of sleep. These events are classified as Apneas or Hypopneas. Apnea is when breathing (airflow) stops for 10 seconds or more. Hypopnea is a partial blockage of airflow resulting in arousal and a possible drop in oxygen level. An RDI of 45 would indicate that the patient is experiencing complete or partial airflow blockage 45 times per hour.
Restless Legs Syndrome - The sleep disorder characterized by tingling, creeping, crawling, or aching sensation in the legs that tends to occur when an individual is not moving. There is an almost irresistible urge to move the legs that relieve the sensations. Inability to remain at rest can result in severe sleep disturbance.
Restlessness (Referring to Quality of Sleep) - Persistent or recurrent body movements, arousals, or brief awakenings in the course of sleep.
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