Featured Research

from universities, journals, and other organizations

Remote Heat Imaging Identifies Sleep Disorder Without Disturbing Patients

Date:
October 25, 2007
Source:
American College of Chest Physicians
Summary:
New research shows that remote infrared imaging can monitor airflow and accurately detect abnormalities during sleep, without ever coming in contact with the patient. Remote infrared imaging can monitor airflow and accurately detect abnormalities during sleep, without ever coming in contact with the patient.

Sleep apnea is commonly diagnosed by way of measuring airflow by nasal pressure, temperature, and/or carbon dioxide, through sensors placed in the nose. However, this method is uncomfortable to some and can potentially disturb sleep. But new research, presented at CHEST 2007, the 73rd annual international scientific assembly of the American College of Chest Physicians (ACCP), shows that remote infrared imaging can monitor airflow and accurately detect abnormalities during sleep, without ever coming in contact with the patient.

The study indicates that the new method is ideal because it is portable and can monitor sleep in a natural environment.

"Polysomnography is a diagnostic test, which establishes the presence or absence of sleep disorders. But standard methods have the potential to significantly disturb a patient's sleep pattern, so what we see in the lab may not be a true representation of the patient's sleep habits," said lead study author Jayasimha Murthy, MD, Assistant Professor of Medicine, University of Texas Health Science Center at Houston, TX. "However, remote infrared imaging is a noncontact method, so there is minimal interference with the patient. In fact, this system can be designed to where the patient isn't even aware that monitoring is taking place."

In the first study of its kind, Dr. Murthy and his colleagues from the University of Texas Health Science Center at Houston, the University of Houston, and Memorial Hermann Sleep Disorders Center in Houston, TX, evaluated the efficacy of remote infrared imaging (IR-I) in 13 men and women without known sleep apnea. Researchers recorded the heat signals expired from patients' nostrils or mouth using an infrared camera during 1 hour of polysomnography. To minimize any bias, airflow channels were recorded and analyzed separately. Results were then compared with those obtained through the conventional methods of sleep apnea diagnosis, including nasal pressure, nasal-oral thermistors, and capnography.

"The underlying principle of monitoring the relative changes in airflow based on the changing of the infrared heat signal is similar to that of the traditional thermistor," Dr. Murthy explained. "However, the biggest difference is that the thermistor is placed in the subject's nostril while the infrared camera is placed 6 to 8 feet from the patient's head. Also, this method allows us to have recorded data, so we can go back and extract the airflow data after the completion of the study, which we can't do with conventional sensors."

Upon completion, results showed that IR-I detected 20 sleep-disordered breathing events, compared with 22 events detected by the nasal-oral thermistor, and 19 events detected by nasal pressure. Given the outcome, researchers suggest that IR-I was in near-perfect agreement with conventional methods and that it represents a noncontact alternative to standard nasal-oral thermistors. Though Dr. Murthy acknowledges that this study represents a preliminary stage of testing, he is optimistic about the future of infrared imaging for sleep disorder diagnosis.

"The results from this study will greatly impact the development of this technology," he said. "While implementation of this technology for clinical studies is still far away, these early results are encouraging enough for us to pursue this further."

"Sleep apnea is a debilitating condition that affects millions of Americans and can lead to other, life-threatening illnesses," said Alvin V. Thomas, Jr., MD, FCCP, President of the American College of Chest Physicians. "It is important for physicians and researchers to continue to explore new diagnostic tools in order to detect and treat this sleep disorder at the earliest possible stage."


Story Source:

The above story is based on materials provided by American College of Chest Physicians. Note: Materials may be edited for content and length.


Cite This Page:

American College of Chest Physicians. "Remote Heat Imaging Identifies Sleep Disorder Without Disturbing Patients." ScienceDaily. ScienceDaily, 25 October 2007. <www.sciencedaily.com/releases/2007/10/071023164055.htm>.
American College of Chest Physicians. (2007, October 25). Remote Heat Imaging Identifies Sleep Disorder Without Disturbing Patients. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2007/10/071023164055.htm
American College of Chest Physicians. "Remote Heat Imaging Identifies Sleep Disorder Without Disturbing Patients." ScienceDaily. www.sciencedaily.com/releases/2007/10/071023164055.htm (accessed September 22, 2014).

Share This



More Health & Medicine News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Liberia Pleads for Help to Fight Ebola

Liberia Pleads for Help to Fight Ebola

AP (Sep. 22, 2014) Liberia's finance minister is urging the international community to quickly follow through on pledges of cash to battle Ebola. Bodies are piling up in the capital Monrovia as the nation awaits more help. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Ebola Doctor Says Border Controls Critical

Ebola Doctor Says Border Controls Critical

AP (Sep. 22, 2014) A Florida doctor who helped fight the expanding Ebola outbreak in West Africa says the disease can be stopped, but only if nations quickly step up their response and make border control a priority. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Global Ebola Aid Increasing But Critics Say It's Late

Global Ebola Aid Increasing But Critics Say It's Late

Newsy (Sep. 21, 2014) More than 100 tons of medical supplies were sent to West Africa on Saturday, but aid workers say the global response is still sluggish. Video provided by Newsy
Powered by NewsLook.com
Sierra Leone in Lockdown to Control Ebola

Sierra Leone in Lockdown to Control Ebola

AP (Sep. 21, 2014) Sierra Leone residents remained in lockdown on Saturday as part of a massive effort to confine millions of people to their homes in a bid to stem the biggest Ebola outbreak in history. (Sept. 20) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins