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British Journal of Anaesthesia, 1974, Vol. 46, No. 4 253-259
© 1974 The Board of Management and Trustees of the British Journal of Anaesthesia

other

EVALUATION OF A NEW THIN FILM TONOMETER

C. CHALMERS, B. D. BIRD and J. G. WHITWAM

The performance of a new thin film tonometer is described. Temperature equilibration between blood samples, up to 8 ml, starting near room temperature in the cuvette, and the water jacket (37°C) occured within 6 min. Blood intially at 4°C, required 6, 8 and 10 min for volumes of 2, 3 and 8 ml respectively to reach the temperature of the water bath. For blood samples up to 4 ml in volume, equilibration with oxygen and carbon dioxide equilibration occured by 10 min with flows as low as 200 ml/min, while for oxygen equilibration did not occur by 10 min when the gas flow was less than 400 ml/min. With a gas flow of 500 ml/min oxygen equilibration occured in 8 min. Thus for 8 ml of blood, equilibrium with the gas phase for both carbon dioxide and oxygen required 8 min at a flow of 500 ml/min, and 10 min at 400 ml/min. There was no change in haematocrit up to 1 hour and no haemolysis due to tonometry up to 15 min. Even after equilibration for 1 hour the amount of haemolysis was small. The apparatus was remarkably simple to operate and provides considerable advantage over existing methods of tonometry.


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