Method and device for filtering out baseline fluctuations from an electrocardiogram

US5469856A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Lena Lundstrom · Stockholm, SE
• Peter Karlsson · Lund, SE
• Thomas Ohlsson · Sandviken, SE

Key dates

• Filing date: Dec 22, 1993
• Grant date: Nov 28, 1995
• Expiry date: Dec 22, 2013

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/347
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Method and device for filtering out baseline fluctuations from an electrocardiogram. It is known to provide a high pass filter for filtering out baseline fluctuations from an electrocardiogram, the lower cut off frequency of a high pass filter is at a value below the frequencies which are characteristic of the heart signals at the lowest possible heart rate. In order to increase the effectiveness of the baseline filtering, it is provided that in a device (4) the current heartbeat rate is determined from the electrocardiogram and, in dependence thereupon, the lower cut off frequency of the filter (2) is altered in such a manner that the lower cut off frequency is increased in the case of an increasing heartbeat rate and is decreased in the case of a decreasing heartbeat rate.