There is provided a method of determining a diagnostic measure of sleep apnea including the following steps: acquiring an electrocardiogram signal, calculating a set of RR intervals and electrocardiogram-derived respiratory signal from said electrocardiogram, and hence calculating a set of spectral and...http://www.google.de/patents/US20030055348?utm_source=gb-gplus-sharePatent US20030055348 - Apparatus for detecting sleep apnea using electrocardiogram signals
