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Electrocardiogram derived apnoea/hypopnea index

An apnea and index technology, applied in electrocardiography, electrical digital data processing, bioelectrical signal measurement, etc., can solve problems such as small signal-to-noise ratio

Active Publication Date: 2010-08-25
COMPUMEDICS MEDICAL INNOVATION
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  • Abstract
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Problems solved by technology

However, this CSA signal is very small compared to the background noise, that is, there is a small signal-to-noise ratio

Method used

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  • Electrocardiogram derived apnoea/hypopnea index
  • Electrocardiogram derived apnoea/hypopnea index
  • Electrocardiogram derived apnoea/hypopnea index

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Embodiment Construction

[0029] The present invention provides methods for determining an apnea / hypopnea index for previously unknown ECG signal data obtained from a subject. The method of the present invention advantageously utilizes changes in ECG signals obtained during sleep to calculate an apnea / hypopnea index during sleep.

[0030] Different ECG leads measure a difference in electrical potential between different regions throughout the body. Breathing affects the impedance between the electrodes and thus the potential and the difference between them. The motion of the chest and abdomen changes during a respiratory event and thus changes how the impedance between the electrodes varies with respiratory effort. This results in an observable phase change between the signals derived from the ECG.

[0031] The method uses these phase changes as markers of respiratory events. The method advantageously takes advantage of the short time after a respiratory event and during an awakening during which th...

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Abstract

The present invention provides a method and apparatus for determining the occurrence of apnoeas or hypopneas from ECG signal data alone. The method is carried out by apparatus configured to acquire ECG signals from a sleeping subject, transform the signals to data, and extract ECG features relevant to estimate breathing effort for the determination of respiratory events characteristic of apnoeas and hypopneas. The extracted ECG features are correlates of breathing efforts and are used as surrogate measures of breathing or respiratory events. The method may include calculating an AHI or apnoea / hypopnea index. The method may classify apnoeas into obstructive or central apnoeas.

Description

technical field [0001] The present invention relates to a method for obtaining from a subject (particularly from a subject with sleep-disordered breathing, more particularly sleep apnea, even more particularly obstructive sleep apnea or central sleep apnea) Methods and apparatus for acquiring and analyzing electrocardiographic data. Background technique [0002] Sleep apnea (SA), including obstructive sleep apnea (OSA) and / or central sleep apnea (CSA), in which breathing is stopped, affects a significant proportion of the population. The effects of OSA are felt when the airways collapse and air cannot pass through. The effects of CSA are felt when the subject is unable to inhale and exhale due to reasons associated with central nervous system functioning. Both OSA and CSA can lead to inefficient sleep and other medical problems. [0003] Both OSA and CSA are currently diagnosed in sleep laboratories using overnight polysomnography (PSG) studies, in which subjects sleep wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205
CPCA61B5/0205A61B5/0452A61B5/4818G06F19/345A61B5/7264G16H50/20A61B5/349
Inventor 克里斯·尼尔森尤金·兹尔博格
Owner COMPUMEDICS MEDICAL INNOVATION
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