Tag: ECG

Features of an ECG Wireless Telemetry System

The advancement in technology has made it possible where necessary to monitor subjects from some distance using wireless telemetry. The biological parameter commonly studied this way is the electrocardiogram. The display of ECG and cardiac rates gives enough information … Read More

Features of Microprocessor-Based ECG Systems

Microprocessors have been used in electrocardiographs to obtain certain advanced features like the elimination of artefacts, baseline shifting, and so forth using software techniques. In this article, we look at some of the key features of microprocessor-based ECG systems … Read More

3 Common Causes of Anomalies in ECG Recordings

Irregular patterns of ECG may be caused by either pathological states or at times artefacts. Undesirable presence of artefacts on ECG trace may be due to the following:

  • Interference from the power line
  • Shifting baseline
  • Muscle tremor
3 Common Causes of Anomalies in ECG Recordings

Interference from the

… Read More

Key Features of Modern ECG Systems

Modern diagnostic and monitoring ECG acquisition and analysis systems are equipped with modern-day computer technology. ECG monitoring devices constitute an important part of the patient monitoring systems. Patient monitoring systems are used to continuously or intermittently measure the vital signs … Read More

The Instrumentation for Recording ECG Signals

Since the electrical events in the normal heart precede its mechanical function, ECG signals play an important role in diagnosis and monitoring of a wide variety of cardiac abnormalities including myocardial infarction and chamber enlargements. Hence, ECG signal acquisition systems … Read More

Cardioverter Operation & Biomedical Application

When an operator applies an electric shock of the magnitude of that from a dc defibrillator to the patient’s chest during the T wave of the ECG, there is a strong risk of producing ventricular fibrillation in the patient. … Read More

ECG Electrodes

A typical flexible ECG electrode is composed of certain types of polymers or elastomers that are made electrically conductive by the addition of fine carbon or metal powder. These electrodes are available with pre-pasted AgCl gel for quick and easy … Read More

Principle Parts and Types of ECG Recorders

Building Blocks of an ECG System

In Electrocardiography (ECG) recorder five leads from the patient are connected to the ECG recorder through a selector switch to obtain 12 lead configurations as illustrated below:

ECG recorder building blocks
Figure 1(a) ECG recorder building blocks

A … Read More

Key Factors to Consider in the Design and Operation of Electrocardiograph

There are various factors that must be considered in the design and application of the electrocardiograph. These key factors must be considered by the biomedical engineer as well as the electrocardiograph operator and the physician who interprets the recorded information.… Read More

Bioelectric Potentials and Electrodes Questions & Answers

Q1. What do you understand by bioelectric potentials? List the different types of biopotentials.

Bioelectric potentials are ionic voltages produced when special types of cells perform electrochemical activities. These bioelectric potentials can be measured and the measurement results provide meaningful … Read More