RT Journal
A1 HUGHES RE, MAGOVERN GJ
T1 THe relationship between right atrial pressure and blood volume
JF A.M.A. Archives of Surgery
JO A.M.A. Archives of Surgery
YR 1959
FD August 1
VO 79
IS 2
SP 238
OP 243
DO 10.1001/archsurg.1959.04320080074009
UL http://dx.doi.org/10.1001/archsurg.1959.04320080074009
AB Introduction 
    Present clinical criteria for detecting alterations in blood volume in postoperative patients are inadequate. Laboratory studies to support suspected findings also leave much to be desired. Blood volume studies using radioactive substances and dilution techniques approximate most accurately the existing state at a particular unit of time but they do not determine the rate of replacement, rate of withdrawal, or effectiveness of such therapy except as judged by repeat blood volume or reevaluation and interpretation of clinical signs. It is the purpose of this study to determine the efficacy of continuous monitoring of right atrial pressure in the detection of blood volume changes as previously reported in the experimental animal.1,2Methods 
    Twenty-five consecutive thoracotomy patients were studied with regard to their cardiovascular status, including frequent preoperative and postoperative blood volumes, measurement of hourly urine output, blood pressure, respirations, pulse rate, and clinical evaluation of each patient during the