. Medical diagnosis for the student and practitioner. T?a^ Fig. 201.—Shows three irregular periods due to extrasystoles. At A,J a nodal extrasystole; during B a ventricular extrasystole; and at C an auricular extrasysto le(After Mackenzie.) A record in this case would show the regular occurrence of a wanesand an abnormally early c wave appearing either before or coincidently. Fig. 202.—Radial and jugular tracing from a patient suffering from auricular fibrilla-tion. Xote 1 the absence of a waves in jugular tracing; (2) the presence of fibrillatorywaves (fff : 3 the lack of rhvthm of radial thr
. Medical diagnosis for the student and practitioner. T?a^ Fig. 201.—Shows three irregular periods due to extrasystoles. At A,J a nodal extrasystole; during B a ventricular extrasystole; and at C an auricular extrasysto le(After Mackenzie.) A record in this case would show the regular occurrence of a wanesand an abnormally early c wave appearing either before or coincidently. Fig. 202.—Radial and jugular tracing from a patient suffering from auricular fibrilla-tion. Xote 1 the absence of a waves in jugular tracing; (2) the presence of fibrillatorywaves (fff : 3 the lack of rhvthm of radial thrusts. The slow radial rate is due to digitalis.(After John Hay.) with the a wave. In the latter case the c wave cannot be differentiatedfrom the a but its location is determined bv the usual method. 5io MEDICAL DIAGNOSIS It is to be noted that in ventricular extrasystoles the a waves do notoccur prematurely and the so-called compensatory pause following isequal to two complete heart cycles. Note.—Extrasystoles of ventricular origin in rare instances occur asinterpolated beats between two normally spaced ventricular contractionseach of which represents a response to normal auricular stimulation. 3. Nodal extrasystole is indicated by the premature and simultaneouscontraction of both auricles and ventricles. This is followed by a com-pensatory pause equal to two full
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
