Biomedical Engineering Reference
In-Depth Information
Chapter 3
ECG Acquisition in a Computer
3.1 Introduction
Most of the modern electrocardiogram recording systems in a clinical setup use a
desktop computer as the final data acquisition element. This allows each storage
and retrieval of records and data sharing with concerned medical experts on
demand. Perhaps the most advantageous feature of computerized acquisition is
ECG analysis for feature extraction using software. Presently, a few standard ECG
analysis softwares are available which provide accurate preliminary level features
for the cardiologists for 'assisted diagnoses.' Often, they include a powerful
'visualization tool' that felicitates detailed investigation using the ECG plot on the
computer screen. The objective of this chapter is to highlight the block structure
and key functional features of a typical ECG acquisition system in desktop
computer. This is followed by a description of a PC-based single-channel ECG
acquisition system using serial port communication.
3.2 ECG Acquisition in a Clinical Setup
Electrocardiograph still remains the most common cardiac investigation device in
the primary care clinics all over the world. This huge popularity is primarily due to
its non-invasive, painless nature to the patient, and easy procedural steps.
Most common form of ECG tests is 'routine test,' classified as per the ways the
tests are performed as follows:
1. Rest ECG examination—patient lies in rest and multilead recording is done.
2. Exercise ECG—it is also called 'stress ECG' or 'treadmill test' (TMT), and the
patient is required to exercise in a treadmill machine.
3. Holter test—this is a prolonged recording (24 or 48 h) where the patient can
lead his normal life.
Search WWH ::




Custom Search