An electronic apparatus for early detection of changes in red cell content of blood during anaesthesia

  • A De Waal
  • JM Hugo
  • CJC Nel
  • JM Meyer
  • JB De Vaal
  • JF Morrison

Abstract

An electronic apparatus was developed for anaesthetists to use to detect changes in red cell concentration during surgery. The mechanism is based on the relationship between the red cell content and the electrical conductivity of blood. In a pilot study of 170 blood samples, a correlation coefficient of 0,9806 was obtained between haematocrit and the instrument readings. To evaluate the instrument's performance in practice, and factors that might influence its readings, a series of 10 cases of aortic surgery were investigated. It is concluded that, although changes in electrolyte concentration, pH and temperature do affect the instrument's readings, these are insignificant compared with those of red cell content, and that the device can be used to indicate a drop in red cell concentration.

S Afr Med J 1989; 76: 148-150

Author Biographies

A De Waal
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
JM Hugo
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
CJC Nel
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
JM Meyer
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
JB De Vaal
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
JF Morrison
Departments of Chemical Pathology, Anaesthetics, Surgery, Cardiothoracic Surgery and Physiology and the Multidisciplinary Intensive Care Unit, University of the Orange Free State and Universitas Hospital, Bloemfontein
Published
2017-08-06
Section
Articles

Journal Identifiers


eISSN: 0256-95749
print ISSN: 2078-5135