PRACTICAL EXERCISES 



193 



18. Venous Pulse Tracing from the Jugular Vein. Arrange a 

 recording tambour to write on a drum. Connect the tambour with 

 the stem of a small glass thistle-tube (or with a small metal cup) by a 

 piece of narrow rubber tubing, and apply the cup-shaped end of the 

 thistle-tube over the right jugular bulb of a fellow-student. This 

 lies about i inch external to the 



right sterno-clavicular articulation, 

 and a little above it. The receiver 

 may have to be moved about a 

 little until the best pulsation is 

 obtained. The ' patient ' should be 

 lying down, the shoulders slightly 

 raised, the head on a pillow and 

 turned slightly to the right, in order 

 to relax the right sterno-mastoid 

 muscle (Mackenzie). 



19. Polygraph Tracings. 

 Arrange the polygraph over the 

 radial artery, as with an ordinary 

 sphygmograph, so that the lever will 

 record the radial pulse when the 

 strip of paper is set moving. If the 



instrument has only one tambour, connect the tambour to a receiver 

 or thistle-tube over the jugular bulb, and arrange the writing-point 

 of the tambour immediately below the writing-point connected with 

 the radial. If the polygraph is provided with clockwork to record 

 time, set off the time-marker writing fifths of a second. When it is 



FIG. 88. EFFECT OF EXERCISE ON 

 THE PULSE (MAREY). 



Upper tracing, normal ; lower, 

 after jrunning. 



FIG. 89. EFFECT OF AMYL NITRITE ON THK 

 PULSE (MAREY). 



Upper tracing, normal ; lower, after inhala- 

 tion of amyl nitrite. 



FIG. 90. PULSE TRACINGS 

 FROM DIFFERENT ARTERIES. 



T, temporal ; R, radial ; P, 

 artery of foot (v. Frey). 



seen that the writing-points are marking properly, start the clockwork 

 which moves the strip of smoked paper. Repeat the observation 

 with the tambour connected with the apex-beat. Letter the curves 

 as far as possible as in Figs.';55 and/ 56 (p. 137) without at present 

 attempting their exact analysis. 



If the polygraph has two tambours, simultaneous tracings of the 



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