Clinical electrocardiography . Fig. 36.—Right alternating ventricular premature contractions (Exsys.). Elec-trocardiogram in Derivation II. low voltage (Fig. 33). Figure 34 is an electrocardiogram in Deriva-tion II showing ventricular premature contractions resulting frommultiple foci of ectopic stimuli. The premature contraction aris-ing in the right ventricle has a very large upstroke and a T wave K ^5/s ::?... ? : ... ? . .??;.?? ? . ?? ??, ? ? .? .? , „...- ? sr as. £s:ssssr ^ssssssar -S!^!-^ ^j-SBBBS 5 . a^fwgggMi ., ^BB5Slgg^sg5£. aasgslgj^ aasiggssi ^Lll^Sl Fig. 37.—Paired ventricular p

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Clinical electrocardiography . Fig. 36.—Right alternating ventricular premature contractions (Exsys.). Elec-trocardiogram in Derivation II. low voltage (Fig. 33). Figure 34 is an electrocardiogram in Deriva-tion II showing ventricular premature contractions resulting frommultiple foci of ectopic stimuli. The premature contraction aris-ing in the right ventricle has a very large upstroke and a T wave K ^5/s ::?... ? : ... ? . .??;.?? ? . ?? ??, ? ? .? .? , „...- ? sr as. £s:ssssr ^ssssssar -S!^!-^ ^j-SBBBS 5 . a^fwgggMi ., ^BB5Slgg^sg5£. aasgslgj^ aasiggssi ^Lll^Sl Fig. 37.—Paired ventricular premature contractions. Electrocardiogram in Derivation II. directed downward, while that arising in the left ventricle presentsthe mirror image of the right. The P wave is often submergedin the aberrant Q R S complex. Figures 35 to 39 show prematurecontractions interrupting the normal rhythm in various ways. CARDIAC ARHYTHMIAS 65. W

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