Blood Volume Measurement Following Subarachnoid Haemorrhage
The accurate assessment of circulating blood volume by direct clinical observation is notoriously difficult (Irwin et al. 1972). Measurements of central venous pressure, pulmonary wedge pressure and cardiac output may provide useful additional information about the cardiovascular status of patients, but involve invasive techniques with attendant risks, and require intensive care facilities (Finn et al. 1986, Pritz 1984 a, b). In contrast, blood volume measurements using radioisotopes are bedside procedures. However, for several reasons they have not been widely adopted in routine surgical practice. They require certain laboratory facilities and technical support and tend to be less accessible to the clinician who, as a result, remains unfamilar with their use. They are relatively time consuming to perform and unless sufficient care is taken significant methodological errors may occur. Finally, and perhaps most importantly, the problems of standardizing or predicting normal values may seriously hamper the interpretation of results.
KeywordsBlood Volume Subarachnoid Haemorrhage Total Body Water Circulate Blood Volume Inappropriate Secretion
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