In the 1950s Norman "Jeff' Holter, the American physicist, developed and gave his name to the technique of recording physiological signals from ambulant patients.' Holter monitoring has now come to be synonymous with ambulatory electrocardiography. In hospital practice the term ECG (electrocardiogram) taping is used, often with the prefix 24 hours to indicate the usual duration of the record. A...

more commonly encountered deformities are discussed. In addition, the isolated T-negativity syndrome is described, a rare type of precordial T-wave inversion which may be encountered in normal subjects and is often indistinguishable from the ST-T deformity of recent myocardial infarction. The spatial vector method of interpretation is found to provide a simple yet rational basis for the interpr...

The Einthoven hypothesis implies that differences in the conductivity of body tissues are not sufficiently great to invalidate the concept that the body is a homogeneous volume conductor. Some investigators believe the lungs are sufficiently poor conductors to make questionable the concept that the body can be regarded as a homogeneous volume conductor. Intrabronchial electrocardiography is pre...

OBJECTIVES This study compared the accuracy and cost implications of using exercise echocardiography and exercise electrocardiography for detection of coronary artery disease in women. BACKGROUND The specificity of exercise electrocardiography in women is lower than in men. Exercise echocardiography accurately identifies coronary artery disease in women, but its utility in place of exercise e...