Posted on 10/23/2007 1:48:48 PM PDT by crazyshrink
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.”
### CHEST 2007 is the 73rd annual international scientific assembly of the American College of Chest Physicians, held October 20-25 in Chicago, IL. ACCP represents 17,000 members who provide patient care in the areas of pulmonary, critical care, and sleep medicine in the United States and throughout the world. The ACCP’s mission is to promote the prevention and treatment of diseases of the chest through leadership, education, research, and communication. For more information about the ACCP, please visit the ACCP Web site at www.chestnet.org.
Sleep apnea — I have it.
Are you using CPAP?
But do you still have to wear a thousand little electrodes in your scalp?
Yes, for 15 years. I have wonderful sleep. Just have to have electricity — or I cannot sleep. So, I have to head for the hills when hurricanes are threatening.
bmflr
But do you still have to wear a thousand little electrodes in your scalp?
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This study appears to use a method that does not require those electrodes or the stinky cream used to apply them.
bump
up your alley
I kept telling Mrs. hotshu that she was not breathing “right” during the night and she should get checked for sleep apnia. She kept denying that anything was wrong, but was constantly fatigued.
We spent a bit of time apart due to job relocations during which she got a cat. She started telling me that the cat kept waking her up in the middle of the night by patting her face. I finally convinced her that the cat was patting her face because she had stopped breathing.
She finally went for the clinical tests, and sure ‘nough, my baby stops breathing while sleeping. It has had very damaging effects to her physically because of the delay in obtaining breathing assistance, but she has finally gotten medical assistance.
Moral to the story: If someone you love suffers from suspected sleep apnia, get them a loving cat.
Thanks for the post, crazyshrink.
Eh? Hubby just had one of those blood oxygen readers on his finger.
Use of scap electrodes went the way of bell-bottom pants. Either skull caps or small adhesive electrodes are utilized these days.
I had my test done about 6 years ago, and I had half a dozen scalp electrodes, finger oxygen monitor, and a CPAP mask with airflow sensors.
I don't have full blown apnea, but I do snore very loudly and my wife loves my CPAP because now she gets a good night's sleep as well.
CPAP didn’t work for me. Having a harness strapped around my head, a mask clamped to my face with a tube sticking out of it, pumping air up my nose, drove me crazy. It was worse than the sleep apnea.
Ask your doctor about something called a snore-guard. Its a dental appliance that works wonders for Apnea.
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