Patient monitoring apparatus

• US 6,011,989 A
• Filed: 08/05/1998
• Issued: 01/04/2000
• Est. Priority Date: 08/05/1997
• Status: Expired due to Term

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kohden Corporation
• Inventors: Tanaka, Rie, Sugo, Yoshihiro, Aso, Shigeru, Chen, Wenxi, Sohma, Takeshi, Ochiai, Ryoichi
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US09/129,213
• Time in Patent Office: 517 Days
• Field of Search: 600/513
• US Class Current: 600/513
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/364 Detecting abnormal ECG interval, e.g. extrasystoles, ectopic heartbeats

Abstract

An electrocardiogram signal derived from electrocardiogram measuring means 1 and a pulse signal derived from pulse-wave measuring means 2 are applied to a CPU 30. The CPU 30 processes the cardiogram signal to detect a QRS wave signal, and processes the pulse signal to detect the amplitude of the pulse signal. The CPU 30 judges whether or not the QRS wave is caused by a ventricular premature contraction. If two QRS waves, not caused by ventricular premature contraction, occurs successively, and the CPU 30 judges if A0×k>A1. The CPU 30 judges that a supraventricular extrasystole is occurred. Here, A0 is an amplitude of the first QSR wave; A1 is an amplitude of the second QSR wave; and k is a preset value, 0<k<1.

Claims

1. A patient monitoring apparatus comprising:

electrocardiogram measuring means for measuring electrocardiograms;

pulse-wave measuring means for measuring pulse waves;

QRS-wave detecting means for detecting QRS waves on an electrocardiogram measured by said electrocardiogram measuring means;

pulse-amplitude detecting means for detecting amplitudes of pulse waves measured by said pulse-wave measuring means;

first judging means for judging whether or not the QRS wave measured by QRS-wave detecting means is caused by a specific arrhythmia; and

second judging means for operating such that if said first judging means judges that the QRS wave is not the QRS wave caused by the specific arrhythmia, said second judging means judges whether or not the amplitude of the pulse wave corresponding to the QRS wave detected by pulse-amplitude detecting means is smaller than a preset value.

2. The patient monitoring apparatus according to claim 1, wherein the specific arrhythmia is a ventricular premature contraction.

3. The patient monitoring apparatus according to claim 1, in which said second judging means includes

third judging means for judging whether or not at least two QRS waves, which are those not caused by the specific arrhythmia, appear in successive fashion;

and

fourth judging means for operating such that if said third judging means judges that at least two QRS waves which are those not caused by specific arrhythmia successively appear, said fourth judging means judges whether or not the amplitude of the pulse wave corresponding to the second QRS wave is smaller than a value set up on the basis of the amplitude of the pulse wave corresponding to the first QRS wave.