The Journal of laboratory and clinical medicine . ts, then the pulse issaid to be totally irregular. THK ANALYSIS OF THE vexoUS CURVE. We determine first that wave in the jugular tracing occurring synchronouslywith the carotid pulse. We know that the radial wave at the wrist occurs .1 ofa second after the carotid wave in the neck, and this fact gives us the means bywhich we can determine the c wave in the venous tracing. With the iugular and radial tambours in place run ofif a short strip of venoustracing, then without moving the jugular tambour, stop the polygraph makingan ordinate upon the p
The Journal of laboratory and clinical medicine . ts, then the pulse issaid to be totally irregular. THK ANALYSIS OF THE vexoUS CURVE. We determine first that wave in the jugular tracing occurring synchronouslywith the carotid pulse. We know that the radial wave at the wrist occurs .1 ofa second after the carotid wave in the neck, and this fact gives us the means bywhich we can determine the c wave in the venous tracing. With the iugular and radial tambours in place run ofif a short strip of venoustracing, then without moving the jugular tambour, stop the polygraph makingan ordinate upon the paper by moving the pens quickly from side to side—theseordinates are called index marks; now without having shifted the position of thejugular tambour apply firmer pressure and secure a short strip of carotid tracing,making similar index marks upon stopping the instrument. We now have twotracings, venous and carotid together with the radial, upon which we can deter-mine accurately by measurement the time relationship of the events occurring in. Fig. —To illustrate the method of the c wave in the jugular tracing. Both jugular andcarotid tracing taken without moving the jugular tambour. the jugular and carotid tracing to the up-stroke of the corresponding radial. Allmeasurements being made from the index marks at the right on to the tracing atthe left. We establish first the carotid up-stroke C corresponding to a given radialwave at the right of the tracing; we then measure off an equivalent number ofbeats on the radial tracing on the venous side at the left, we may call this dis-tance R-R. If we now transfer this measurement R-R to the upper tracing placing thepoint corresponding to R at C, a vertical line from R will fall upon a wave inthe jugular tracing which bears the same relationship to the up-stroke of itscorresponding radial wave R as does C to R, this wave therefore is the c waveand we may mark it as such. This procedure can be applied only when the
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