Several criteria exist for the diagnosis for left ventricular hypertrophy as shown by high voltage on the electrocardiograph. This study of 200 healthy young recruits to the Royal Artillery with normal blood pressure and normal left ventricular wall thickness as measured by echocardiography [corrected] shows that no matter which criteria are used the false positive rate is approximately 25%. Hi...

Noise in ECG signals will affect the result of post-processing if left untreated. Since ECG is highly subjective, the linear denoising method with a specific threshold working well on one subject could fail on another. Therefore, in this Letter, sparse-based method, which represents every segment of signal using different linear combinations of atoms from a dictionary, is used to denoise ECG si...

The poor prognosis associated with chaotic irregularity of the pulse was clearly known by most of ancient physicians. Perhaps the earliest description of atrial fibrillation is in Chinese, in The Yellow Emperors Classic of Internal Medicine, but in recorded history, William Harvey in 1628 was probably the first to describe ‘fibrillation of the auricles’ in animals. The first electrocardiographi...

No reports testing the efficacy of the use of the QT/RR ratio <1/2 for detecting a normal QTc interval were found in the literature. The objective of the present study was to determine if a QT/RR ratio < or =1/2 can be considered to be equal to the normal QTc and to compare the QT and QTc measured and calculated clinically and by a computerized electrocardiograph. Ratios (140 QT/RR) of 28 succe...

In 1791, Galvani, in Italy, first showed electromotor activity in the leg muscle of the frog (1). Action potentials of skeletal muscle were later found by several physiologists in the 19th century and in the 1870s, electromotor phenomena were found in heart muscle using exposed animal hearts. Lippman in Paris, in 1872, invented the capillary electrometer which could demonstrate cardiac electric...

This paper provides electronic implementation of electrocardiograph (ECG) circuit by using instrumentation amplifier (IA) as bio-potential amplifier in such a manner which reduces noise, common voltage, DC offset value and RF interference from the existing circuit.Noise and common voltage can be removed from ECG using driven right leg circuit or by using isolator circuit. DC offset can be remov...