Clinical electrocardiography . o 10 barium chlorid in 1 per cent, aqueous solution premature ventricu-lar contractions occurred. With doses of 25 to 50 mg., minusaccelerator stimulation, ventricular tachycardia, and, at times,a transient arhythmia were produced. Calcium chlorid, 100 to 200mg. in 10 per cent, aqueous solution, produced similar and Winterberg concluded that these salts increasethe ventricular irritability, but they did not believe that the nodaltissues were appreciably affected. The electrocardiogram exhibits series of premature ventricularcontractions,
Clinical electrocardiography . o 10 barium chlorid in 1 per cent, aqueous solution premature ventricu-lar contractions occurred. With doses of 25 to 50 mg., minusaccelerator stimulation, ventricular tachycardia, and, at times,a transient arhythmia were produced. Calcium chlorid, 100 to 200mg. in 10 per cent, aqueous solution, produced similar and Winterberg concluded that these salts increasethe ventricular irritability, but they did not believe that the nodaltissues were appreciably affected. The electrocardiogram exhibits series of premature ventricularcontractions, the complex forms varying with the point of originin the ventricles. Identification of auricular contractions duringthe tachycardia is frequently difficult, but careful measurementshows that retrogression does not occur, since the first auricular 9° CLINICAL ELECTROCARDIOGEAPHY complex of the normal rhythm falls at the proper point ( to 68). J 1 g 1 WM1M Fig. 65.—Schematic graph of paroxysmal ventricular Fig. 66.—Paroxysm of ventricular tachycardia. Rate 133. Electrocardiogram in Derivation II.
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