Find in Library

It is well documented that body position significantly affects breathing indices during sleep in patients with obstructive sleep apnea. They usually worsen while changing from a non-supine to a supine position. Therefore, body position should be an accurately measured and credible parameter in all types of sleep studies. The aim of this study was to specify the accuracy of a neck-based monitoring device (Clebre, Olsztyn, Poland) mounted at the suprasternal notch, in determining a supine and non-supine sleeping position, as well as specific body positions during sleep, in comparison to polysomnography (PSG). A sleep study (PSG along with a neck-based audio-motion sensor) was performed on 89 consecutive patients. The accuracy in determining supine and non-supine positions was <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>96.9</mn><mrow></mrow><mo>%</mo><mo>±</mo><mn>3.9</mn><mrow></mrow><mo>%</mo></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>97.0</mn><mrow></mrow><mo>%</mo><mo>±</mo><mn>3.6</mn><mo>%</mo></mrow></semantics></math></inline-formula>, respectively. For lateral positions, the accuracy was <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>98.6</mn><mrow></mrow><mo>%</mo><mo>±</mo><mn>2</mn><mrow></mrow><mo>%</mo></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>97.4</mn><mo>%</mo><mo>±</mo><mn>4.5</mn><mrow></mrow><mo>%</mo></mrow></semantics></math></inline-formula> for the right and left side, respectively. The prone position was detected with an accuracy of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>97.3</mn><mo>%</mo><mo>±</mo><mn>5.6</mn><mo>%</mo></mrow></semantics></math></inline-formula>. The study showed a high accuracy in detecting supine, as well as other gross positions, during sleep based on a sensor attached to the suprasternal notch, compared to the PSG study. We feel that the suprasternal notch is a promising area for placing wireless sleep study devices.