T HE CHARACTERISTICS of the electrocardiographic tracing are determined by three independent variables. The first of these involves the potentials generated by the myocardium during depolarization and repolarization. These potentials can be altered by a wide variety of physiologic states, as well as by intrinsic disease of the myocardium. The second factor relates to the properties of the extra...

Given the QRS width, the intraventricular conduction delay could not be explained solely by the left anterior hemiblock (LAHB). Placement of the rightward precordial leads V1–V2 one intercostal (IC) space above the conventional level uncovered a terminal R-wave suggestive of complete right bundle branch block (RBBB) (Fig. 1). Although there might be a contributing role for delayed activation of...

THE concept of listening to the electro-cardiogram brings up an interesting question and one that most cardiologists, even ones with long experience in electro-cardiography, have largely ignored. What would you expect to hear if any of the usual leads were amplified by a suitable electronic device and the output were connected to a loud speaker or to head phones? Since the QRS complexes are the...

THE electrocardiogram of presumably normal infants and children has been the subject of extensive investigation.''2 On the other hand, an extensive review of the literature failed to reveal reports of the electrocardiograms of infants and children suffering from pulmonary disease.'3' 14 Ziegler12 in 1951 recorded the electrocardiograms of normal inifants and children ranging in age from birth t...

We examine the performance of Total Variation (TV) smoothing for processing of noisy Electrocardiogram (ECG) recorded by an ambulatory device. The TV smoothing is compared with traditionally-used bandpass filtering using ECG with artificially added noise, as well as with real-world noise obtained during physiological monitoring. The fundamental difference between TV smoothing and traditional ba...

The case here described was found in the course of a mass radiographic survey. Case History.-The patient was a well-grown man aged 35 years. He was free from symptoms. He had no significant past medical history. He had always lived a normal life and had been moderately athletic in his school days. On clinical examination it was found that cardiac pulsation was palpable in the right fourth inter...

ELECTROCARDIOGRAPHIC (ECG) recording during exercise, employed for years by work physiologists, has only recently arrived on the scene of cardiovascular investigations in clinical, epidemiological, and sports medical areas. This has come about from interest in the import of ECG events observed during activity, from the improved safety provided by monitoring performance tests, and from technical...

Fig. 3.?Electrocardiogram, showing apparent bundle branch block (right-sided) and ventricular extra-systoles. The short duration' of P-R and the widening of the QRS complexes are characteristic. (Date of tracing : 22-4-40.) Fig. 3.?Electrocardiogram, showing apparent bundle branch block (right-sided) and ventricular extra-systoles. The short du of P-R and the widening of the QRS complexes are c...