. Medical diagnosis for the student and practitioner. Fig. 225.—Mr. J. B. Electrocardiographic record showing right branch block and anauricular extrasvstole. The extrasvstole occurs in Lead III. ELECTROCARDIOGRAPHIC RECORDS 527 the two is the P-R interval of that heart cycle. This distance laid off onthe time record will give its equivalent in hundredths of a second. Thenormal P-R interval is sec. Indicate the time length on therecord in the proper heart cycle just below the base line. In a like manner determine the P-R interval of the remaining heartcycles of Lead II and label thos
. Medical diagnosis for the student and practitioner. Fig. 225.—Mr. J. B. Electrocardiographic record showing right branch block and anauricular extrasvstole. The extrasvstole occurs in Lead III. ELECTROCARDIOGRAPHIC RECORDS 527 the two is the P-R interval of that heart cycle. This distance laid off onthe time record will give its equivalent in hundredths of a second. Thenormal P-R interval is sec. Indicate the time length on therecord in the proper heart cycle just below the base line. In a like manner determine the P-R interval of the remaining heartcycles of Lead II and label those showing a variation from the first readingif any be present. It is important to measure many P-R intervals, for arecord may show considerable variation in them. This variability of theP-R interval in a record is of distinct clinical significance. 4. Determine the rate of .the record. With the dividers lay off on thetime record a distance equal to 3 seconds (15 main divisions on time the tops of the R-waves lay off a 3-second interv
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
