Physiology and biochemistry in modern medicine . Fig. 91.—Auricular flutter. Auricular rate 300. Ventricular rate 80. Note the inversion of the P deflections. Usually the ventricular complexes are such as to indicate that thestimulus arose in the auricle (supraventricular). The height of theindividual deflections Q-R-S-T may vary, depending on the predominanceof a right or left ventricular \T-B | Fig. 92.—Delayed conduction. Note the normal appearance of the electrocardiogram except forthe prolongation of the P-R interval, which measures .23 seconds. Heart-block.—There are three
Physiology and biochemistry in modern medicine . Fig. 91.—Auricular flutter. Auricular rate 300. Ventricular rate 80. Note the inversion of the P deflections. Usually the ventricular complexes are such as to indicate that thestimulus arose in the auricle (supraventricular). The height of theindividual deflections Q-R-S-T may vary, depending on the predominanceof a right or left ventricular \T-B | Fig. 92.—Delayed conduction. Note the normal appearance of the electrocardiogram except forthe prolongation of the P-R interval, which measures .23 seconds. Heart-block.—There are three degrees of severity in heart-block: (1)delayed conduction, (2) partial dissociation, and (3) complete dissocia-tion. Any one of these conditions may be present in the same patient, atsuccessive intervals. Delayed Conduction.—When the conducting tissues of the heart areso affected as to cause an abnormal prolongation of the P-R interval,the condition is called delayed conduction. The ventricles respond toeach stimulus originating at the sinus node, but the time required for theimpulse to pass through the conducting tissues is longer than normal. CLINICAL APPLICATIONS OF ) A KDK XiKAIII V 271 In a simple case the electrocardiogram may appear perfectly normal,but when the PR interval is measured accurately, it will be found to belengthened beyond the extreme limits of the normal (
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