Radio telemetry—simple apparatus for cardiovascular monitoring during surgery
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Over the past 4 years apparatus such as that described has been in regular use to monitor the cardiovascular activity of anaesthetised patients during surgical operations (Johnstone, 1966;Johnstone andHorsfall, 1966;Johnstone, 1967;Johnstone andBarron, 1967). Because the electrodes and transducers can be applied in a matter of seconds, whilst the receiving and monitoring equipment is installed on a readily available trolley, much useful information has been obtained from patients undergoing minor manipulations where more sophisticated means of monitoring or recording would not have been warranted. No receiver interference of any significance has been encountered apart from that transiently caused by diathermy coagulation appliances. When in use, the receiving trolley is conveniently placed in a corner of the operating theatre where it does not impede the movements of the theatre staff. It does not threaten the aseptic procedure in the immediate vicinity of the patient and the cardiovascular information displayed on the cathode-ray oscilloscope is visible to all members of the surgical team. Both the transducer-transmitters and the receiver-recorder units are robust and reliable, the former being virtually indestructible so far as the wear and tear of everyday surgical practice in busy operating theatres are concerned. A short colour film has been prepared showing the development and use of these devices and is available from Millbank Films Ltd. under the title “Radio Telemetry in Medicine—an introduction”.
KeywordsPulse Wave Conduction Time Radio Telemetry High Input Impedance Dental Resin
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