Biomedical subjects
Publications and source records attributed to R A Royall.
The design and function of a device for bedside measurement of maximum static respiratory pressures is reported. The ability to measure maximum inspiratory and expiratory pressures allows a simple means of monitoring respiratory muscle weakness in both acute and chronic conditions.
Micturating renograms often need to be carried out on children, with whom difficulty may be experienced in synchronizing onset of micturition with camera and computer acquisition. A flow detection system has been developed which will automate these acquisitions, resulting in far fewer false starts or lost studies. The unit was developed specifically for the camera/computer system in our department (IGE 400T and DEC 11/34) but with only minor modifications would be suitable for interfacing to other equipment. It is a free standing unit which requires no modifications of the camera or computer circuitry apart from access to the remote start buttons.
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A prototype rate pressure product module has been constructed for use with Simonsen and Weel Series 8000 monitors. The importance of method of display of rate pressure product is stressed.
An artefact was observed whilst testing profoundly deaf children with a peters AP61c acoustic impedance meter, using the contralateral stapedial reflex technique at high stimulus levels. A study was carried out on cadavers which confirmed the earlier observation, and this pseudo-reflex was found to be caused by the transmission across the head of the stapedial reflex stimulus tone during contralateral testing. An electronic filter was designed and built which suppressed this artefact. It is suggested that this artefact could be mistaken for a stapedial reflex response.