Featured Research

from universities, journals, and other organizations

Researchers Get To The Heart Of Sleep Disorders

Date:
February 4, 1999
Source:
University Of Warwick
Summary:
Using sophisticated analysis of heart rate information, researchers at the University of Warwick have devised a way to diagnose sleep disorders that replaces the detailed and expensive medical investigations currently used.

Using sophisticated analysis of heart rate information, researchers at the University of Warwick have devised a way to diagnose sleep disorders that replaces the detailed and expensive medical investigations currently used.

The number of patients coming forward with sleeping disorders is increasing. Birmingham Heartlands Hospital alone dealt with over 400 sleep disorder cases in the last year. The main problem is sleep apnoea which means “stopping breathing during sleep”. This can occur up to 300 times in one night. Consequences of sleep apnoea include extreme daytime sleepiness, which can result in loss of jobs and even cause road traffic accidents. People who have sleep apnoea are more likely to suffer high blood pressure and die from heart attacks. Most sleep disorder patients can only be diagnosed after a complicated procedure known as polysomnography, for which patients are admitted to hospital overnight. Whilst asleep, they are tested by an array of instruments measuring individual leg and eye movements, electrocardiograms (ECGs), brain waves, chest movements, oxygen level in the blood, snoring and air flow through the nose and mouth.

Every time a sleep apnoea sufferer stops breathing and subsequently awakes, the heart rate is affected. However, doctors have not so far used this heart rate effect as a diagnostic tool for two reasons. Firstly, healthy hearts do not have an entirely regular heart rate, preventing detailed analysis until now. Secondly, the wide variation across patients in the intensity of sleep apnoea means that it is impossible to decide on a simple single quantitative measure to look for when examining ECGs of heart activity. Now researchers at the University of Warwick, working in a cross departmental research group applying mathematical techniques to medical problems, have devised a single analysis of the heart rate which will greatly reduce the time - consuming and expensive polysomnography procedure.

The researchers have combined their knowledge to use mathematical tools to cope with the heart's irregular rate and the wide variation in the effects of sleep apnoea on the heart rate.

They experimented with the application of two mathematical concepts - the Non-equispaced Fourier Transform, and the Discrete Harmonic Wavelet Transform - to the ECGs of 20 sleep apnoea patients and 20 normal subjects. They discovered that by using these tools they could indeed simply diagnose sleep apnoea from the ECG alone. The advantages of this new technique include:

* The ECG data can be analysed in just 20 minutes. Polysomnography data takes 4 - 6 hours.

* A patient can take a portable ECG monitor home. They do not need to be admitted to hospital.

* The technique will allow non - sleep specialist doctors looking at ECGs of patients to diagnose sleep apnoea, even if they were using the ECG to look at other conditions.

The team are now looking at the effect of other conditions on heart rate and believe they can refine the process for application to other heart conditions, asthma and diabetes.


Story Source:

The above story is based on materials provided by University Of Warwick. Note: Materials may be edited for content and length.


Cite This Page:

University Of Warwick. "Researchers Get To The Heart Of Sleep Disorders." ScienceDaily. ScienceDaily, 4 February 1999. <www.sciencedaily.com/releases/1999/02/990204081617.htm>.
University Of Warwick. (1999, February 4). Researchers Get To The Heart Of Sleep Disorders. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/1999/02/990204081617.htm
University Of Warwick. "Researchers Get To The Heart Of Sleep Disorders." ScienceDaily. www.sciencedaily.com/releases/1999/02/990204081617.htm (accessed July 23, 2014).

Share This




More Health & Medicine News

Wednesday, July 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Courts Conflicted Over Healthcare Law

Courts Conflicted Over Healthcare Law

AP (July 22, 2014) Two federal appeals courts issued conflicting rulings Tuesday on the legality of the federally-run healthcare exchange that operates in 36 states. (July 22) Video provided by AP
Powered by NewsLook.com
Why Do People Believe We Only Use 10 Percent Of Our Brains?

Why Do People Believe We Only Use 10 Percent Of Our Brains?

Newsy (July 22, 2014) The new sci-fi thriller "Lucy" is making people question whether we really use all our brainpower. But, as scientists have insisted for years, we do. Video provided by Newsy
Powered by NewsLook.com
Scientists Find New Way To Make Human Platelets

Scientists Find New Way To Make Human Platelets

Newsy (July 22, 2014) Boston scientists have discovered a new way to create fully functioning human platelets using a bioreactor and human stem cells. Video provided by Newsy
Powered by NewsLook.com
Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

Gilead's $1000-a-Pill Drug Could Cure Hep C in HIV-Positive People

TheStreet (July 21, 2014) New research shows Gilead Science's drug Sovaldi helps in curing hepatitis C in those who suffer from HIV. In a medical study, the combination of Gilead's Hep C drug with anti-viral drug Ribavirin cured 76% of HIV-positive patients suffering from the most common hepatitis C strain. Hepatitis C and related complications have been a top cause of death in HIV-positive patients. Typical medication used to treat the disease, including interferon proteins, tended to react badly with HIV drugs. However, Sovaldi's %1,000-a-pill price tag could limit the number of patients able to access the treatment. TheStreet's Keris Lahiff reports from New York. Video provided by TheStreet
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