Clinical electrocardiography . Fig. 28.—Nodal premature contraction. P-R interval 0. Electrocardiogram in Derivation II. 5 Exsy5 5 Fig. 29.—Schematic graph of nodal premature contractions. P-R interval Fig. 30.—Nodal premature contraction (Exsys.). Diminished P-R interval, Electrocardiogram in Derivation II. as the impulse provokes ventricular contraction after havingtraversed junctional paths. If the impulse arises very low in the 62 CLINICAL ELECTROCARDIOGRAPHY junctional tissues, however, an aberrant ventricular complexresults, very much like that of a premature con
Clinical electrocardiography . Fig. 28.—Nodal premature contraction. P-R interval 0. Electrocardiogram in Derivation II. 5 Exsy5 5 Fig. 29.—Schematic graph of nodal premature contractions. P-R interval Fig. 30.—Nodal premature contraction (Exsys.). Diminished P-R interval, Electrocardiogram in Derivation II. as the impulse provokes ventricular contraction after havingtraversed junctional paths. If the impulse arises very low in the 62 CLINICAL ELECTROCARDIOGRAPHY junctional tissues, however, an aberrant ventricular complexresults, very much like that of a premature contraction arisingin the ventricles. 2. The auricles may contract just slightly in advance of theventricles and produce a diminished As-Vs conduction time (P-Rinterval) (Fig. 29). Figure 30 shows this type of nodal prematurecontraction. The P-R interval is only second. / \ V; \ / Fig. 31.—Schematic graph of nodal premature contraction. Presence of an R-P interval. 3. Occasionally the ventricles contract before the auricles andthe P wave follows instead of preceding the R wave. Under suchconditions an R-P interval exists. The ventricular complex usuallyshows aberration (Fig. 31). Figure 32 shows this
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