• Describe technical effects that can occur on ECG waveforms An important factor to consider when using findings on electrocardiograms for clinical decision making is that the waveforms are influenced by normal physiological and technical factors as well as by pathophysiological factors. Traditionally, the focus of bedside monitoring is detection of arrhythmia. However, continuous ST-segment mo...

Two independent sets of P waves have occasionally been observed in the electrocardiograms of experimental animals and attributed to dissociated activity of the two atria (Condorelli, 1929; Scherf and Siedek, 1934). The studies of Marcel and Exchaquet (1938) on the human fetus strongly suggest that atrial dissociation occurs in man, and electrocardiograms have also been illustrated and reported ...

OBJECTIVE To identify the electrocardiographic changes and their associations with metabolic and electrolytic changes in female alcoholics. METHODS The study comprised 44 female alcoholics with no apparent physical disorder. They underwent the following examinations: conventional electrocardiography; serologic tests for syphilis, Chagas' disease, and hepatitis B and C viruses; urinary pregnan...