About WatchPAT

What is the WatchPAT?

WatchPAT is an FDA-approved portable diagnostic home sleep study device that uses the most innovative technology to ensure the accurate screening, detection, and the follow-up treatment of sleep apnea. The WatchPAT accuracy has been validated against traditional Polysomnography studies and its ease of use is unparalleled in the marketplace. It is greatly complemented by the fact that WatchPAT testing is done in the comfort of the patient’s own bedroom; an environment that best reflects the pattern of their sleep habits.

The WatchPAT has excellent reliability with minimum failure rate (< 2%) during data acquisition or data analysis and is regarded the superior evidence-based home sleep device on the market.

The WatchPAT was voted one of the top 10 medical devices of 2010 and is one of only two non air-flow based sleep devices. It has been clinically validated and peer reviewed.

How accurate is WatchPAT in comparison to sleep lab study (Polysomnography)?

There is a high degree of correlation shown in studies between PSG and the WatchPAT both in RDI (Respiratory Disturbance Index) and AHI (Apnea-Hypopnea Index), which are the important measurements that indicate sleep apnea.

How does WatchPAT detect apnea, hypopnea, and respiratory effort related arousal (RERA) events?

  • Apnea is recognized by the transient vasoconstriction that follows the apneic episode.
  • Hypopnea is detected by showing oxygen de-saturation of at least 4% (per Medicare guidelines).
  • The automatic algorithm of WatchPAT analyzes the PAT signal amplitude along with heart rate and oxygen saturation to identify respiratory events.

How does WatchPAT detect rapid eye movement (REM) sleep?

  • A strong association between REM stage sleep and a pattern of low amplitude of the PAT-signal has been found.
  • The amplitude was not accompanied by respiratory events and oxygen saturation remains stable.
  • The low amplitude together with pulse-rate variability results in a highly specific measure for REM sleep.

What is the advantage to using sleep time VS sleep study time when correlating AHI and RDI?

One of the biggest problems with the vast majority of ambulatory sleep apnea devices is the lack of “real sleep” monitoring–the other devices record both sleep and awake time. These devices then provide “total study time,” in which case the respiratory disturbances index (RDI) is calculated by dividing the total number of respiratory events by a substantially longer time period, thus providing a lower RDI (or AHI) than the actual one–which is the time asleep.

Why WatchPAT?

The WatchPAT is a portable device that measures peripheral arterial vasoconstriction and via mathematical algorithm connects this vasoconstriction with apneic episodes. This FDA approved sleep device is unique in its ability to correlate volume changes in peripheral arteries with apneic episodes and so detect sleep apnea.

  1. Convenience and ease of use
    • In-home testing
    • Wrist-worn device
    • No cumbersome head straps, no restraining leads
    • PAT (Peripheral Arterial Tonometry) measurements take advantage of the fact that the finger is an extremely convenient site for non-invasive measurement of the arterial tone.
    • Apneic episodes terminate in brief arousals which are associated with tachycardia and transient peripheral arterial constriction. These vasoconstrictions are then measured.

  2. Accuracy of information
    • Actual sleep time and sleep state
    • WatchPAT is the most scientific and medically-investigated home sleep testing device
    • Provides the most comprehensive reporting including RDI & AHI
    • Nationwide Board-interpretation & diagnosis provided by sleep medicine experts
    • Measuring the PAT signal has been shown to be a highly effective way to detect breathing disorders, based on the arterial response to disordered breathing.

  3. The WatchPAT is able to read six different channels:
    1. Body Position
    2. Snoring
    3. Heart Rate
    4. Oximetry
    5. PAT (Peripheral Arterial Tone)
    6. Actigraphy

Lowest failure rate of all sleep apnea ambulatory devicesThe most precise, user-friendly ambulatory sleep apnea monitor available The choice of Kaiser (more than 22,000 tests annually ) & VA Hospitals.

What's included with the device and given to the patient?

  1. WatchPAT, SBP sensor, Oximeter
  2. Step-by-step Reference Guide including preparation instructions
  3. Patient Instruction Video

Preparations for the WatchPAT sleep study

  1. Hand Preparation
    • Remove rings, watches and jewelry from hand
    • Remove fingernail polish and artificial nails
    • Make sure nails are closely trimmed

  2. Wearing the wrist strap
    • Should be comfortable, not too tight

  3. Attaching WatchPAT
    • Make sure the WatchPAT is properly mounted on the wrist strap. If it is loose, gently slide it in until you hear a click.

  4. Attaching the Oximetry sensor
    • Needs to be done Before PAT probe attachment
    • If using the Nonin 8000FJW sensor, demonstrate proper placement of the finger on the Flexiwrap pad - note the position of the fold line, and that the two black square protrusions are opposite each other.
    • Folding the flaps of the Flexiwrap pad to secure sensor properly.
    • Make sure it is not too tight

  5. Attaching the PAT probe
    • Insert finger all of the way into the probe
    • Remove the tabs one by one by pulling slowly and gradually
    • Both tabs must be fully removed
    • The probe is limited to a SINGLE NIGHT USE. Do not remove the probe during the night.