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In medical diagnostics it is required to monitor the electrocardiogram (ECG) of the patient. It is also necessary to record ECG signals during the critical periods, for example, when the patient is having symptoms of a heart attack, or is feeling uneasy. Each recorded signal is considered to be an event. These events may be easily monitored and stored by a cardiac event recorder.
A Cardiac Event Recorder is a device, which records ECG signals of a patient during the critical periods, for a specific time interval. The recorded events can then be observed or analyzed on a personal computer to determine the cause of uneasiness. The advantage of this system is that the patient can control the device and it maintains a history of his heart condition. This portable device accepts inputs from patient’s body through standard ECG electrodes and logs them on its onboard memory for 1-minute interval (30 seconds before and 30 seconds after the switch is pressed by the patient). A maximum of64/127 such events can be recorded. Each event can be displayed on a PC in Graphical format.
Instead of using a magnetic tape, as was the practice so far, this device employs semiconductor memory. It is powered by rechargeable batteries and can monitor the events for a period of 24 hours.