Monitoring a condition of a subject
Apparatus for monitoring a clinical condition of a subject is described. At least one motion sensor detects motion of the subject and generates a sensed motion signal responsive to the sensed motion. A signal analyzer is adapted to determine a heartbeat-related signal from the sensed motion signal, to determine a first breathing-rate-related signal from the heartbeat-related signal, and to determine a second breathing-rate-related signal directly from the sensed motion signal. The signal analyzer determines the validity of the heartbeat-related signal by comparing the first breathing-rate-related signal with the second breathing-rate-related signal. Other applications are also described.
1. A method for simultaneous measurement of heart rate and respiration rate of a subject, the method comprising:
sensing motion of the subject and generating a sensed motion signal responsive to the sensed motion;
determining a heartbeat-related signal from the sensed motion signal;
determining a first breathing-rate-related signal from the heartbeat-related signal;
determining a second breathing-rate-related signal directly from the sensed motion signal; and
determining a validity of the heartbeat-related signal by comparing the first breathing-rate-related signal with the second breathing-rate-related signal.
2. The method as recited in claim 1 , wherein sensing motion of the subject comprises sensing motion of the subject without contacting the subject.
3. The method as recited in claim 1 , wherein sensing motion of the subject comprises sensing motion of the subject without contacting or viewing clothes the subject is wearing.
4. The method as recited in claim 1 , wherein sensing motion of the subject comprises sensing motion of the subject without requiring compliance of the subject.
5. The method according to claim 1 , wherein determining the first breathing-rate-related signal from the heartbeat-related signal comprises detecting a sinus-arrhythmia signal within the heartbeat-related signal.
6. A system for simultaneous measurement of heart rate and respiration rate of a subject, the system comprising:
at least one motion sensor adapted to detect motion of the subject and generate a sensed motion signal responsive to the sensed motion; and
a signal analyzer:
adapted to determine a heartbeat-related signal from the sensed motion signal,
adapted to determine a first breathing-rate-related signal from the heartbeat-related signal,
adapted to determine a second breathing-rate-related signal directly from the sensed motion signal, and
adapted to determine validity of the heartbeat-related signal by comparing the first breathing-rate-related signal with the second breathing-rate-related signal.
7. The system as recited in claim 6 , wherein the motion sensor is adapted to detect motion of the subject and generate the sensed motion signal responsive to the sensed motion, without contacting the subject.
8. The system as recited in claim 6 , wherein the motion sensor is adapted to detect motion of the subject and generate the sensed motion signal responsive to the sensed motion, without contacting or viewing clothes the subject is wearing.
9. The system as recited in claim 6 , wherein the motion sensor is adapted to detect motion of the subject and generate the sensed motion signal responsive to the sensed motion, without requiring compliance of the subject.
10. The system as recited in claim 6 , wherein the signal analyzer is configured to determine the first breathing-rate-related signal from the heartbeat-related signal by detecting a sinus-arrhythmia signal within the heartbeat-related signal.