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To the Editor:—
Central venous pressure (CVP) monitoring of blood volume in the surgical and medical wards will find increased demands with development of cheap, disposable manometers, such as the 24-inch simple needle-catheter which can easily be introduced into the superior vena cava by a nurse-anesthetist, and a leveling instrument such as the one described here, which eliminates the variable which arises when zeroing the manometer level to the superior vena cava.Many methods depend on a chosen spot on the thorax. With movement of the supine patient, the "spot" may be raised or lowered several centimeters. When the measurement from the top of the mattress to the mid-axillary line is made consideration must be given to the fact that the patient's body sinks lower and lower into the mattress. Any measurement using the top of the chest will necessarily vary more than a measurement from the posterior thorax. The
Rockwell PE. Zeroing the Central Venous Pressure Manometer. JAMA. 1968;203(4):306. doi:10.1001/jama.1968.03140040058027
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