Archive image from page 178 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 CAROTID PULSE OF MAN. 155 EXPERIMENT XXVIL The Carotid Pulse in Man. a. The Ponii of the Pulse. Mount a recording tambour on a stand and connect it with an open tambour designed for carotid artery, leaving side tube open. See that the lezxr of the tambour is hor- kontal. Apply the open tambour to the skin of the neck over the artery, and fasten it in place with the U-shaped spring, placing the ball of the spring in the socket on the back of the tam
Archive image from page 178 of Directions for laboratory work in Directions for laboratory work in physiology directionsforlab1906lomb Year: 1906 CAROTID PULSE OF MAN. 155 EXPERIMENT XXVIL The Carotid Pulse in Man. a. The Ponii of the Pulse. Mount a recording tambour on a stand and connect it with an open tambour designed for carotid artery, leaving side tube open. See that the lezxr of the tambour is hor- kontal. Apply the open tambour to the skin of the neck over the artery, and fasten it in place with the U-shaped spring, placing the ball of the spring in the socket on the back of the tambour and placing the block against the opposite side of the neck. Then test the working of the outfit by pinching the side tube. With each heart beat there should be an excursion of the lever of at least 5 mm. Adjust posi- tion of tambour on neck, and pressure of spring to give the largest pulsation, then bring writing point very lightly I'ig-33- Tambour and . /- , , i neck spring used to study agauist drum. btart drum at 5 mm. Asprhig* 'B'°ban-and- per secoud, closc side branch with open'ti±ur?c!'l'iock' Spring dip and record the curve of the pulse. Unless the friction of writing point upon drum is made as slight as possible, small waves of the pulse curve will be obscured. Mark on the curves to indicate the primary wave and the dicrotic notch. The former results from the systole of the ventricle, and the latter from relaxation of the ventricle and closure of the semilunar valve. The dicrotic notch therefore divides the pulse into its systoHc and diastolic portions, and is to be looked for at about the end of the first third of the curve. Do pre-dicrotic or post- dicrotic waves occur in the record? Take records with four widely different speeds of drum, and observe the effect on the form of the curve. h. The Pulse Rate. Mount a time signal to write below the pulse curve, con- nect it with the clock circuit, start drum at 5 mm. per sec-
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