Coronary artery spasm.
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Angina Pectoris↗
Biomedical subjects
C N Smyth
Publications and source records attributed to C N Smyth.
[Obstetrical tocography. I. Didactic summary].
The importance and value of manometry are presented with examples of patients in labour. It is important to distinguish between the pressures and the forces working on the fetus, especially as far as the causes of fetal bradycardia are concerned. Graphs of magnetic lag are shown in order to demonstrate that the tension on the fetus and sometimes on the placenta and the cord precedes and lasts longer than the increase in hydrostatic pressure which accompanies a contraction. The paper includes the following subjects: Introduction and general observations. The patient and the monitoring device and the tolerance to external and internal manometry by the patient. The concepts of pressure and force. The distrubution of pressures and forces in obstetrics. The measure of forces by their conversion into pressure in a manometric system. The interpretation of the results of the measure of pressure and force in obstetrics.
Adult↗
[Obstetrical tocography. II. Review of its methodology and a new concept].
The methods employed for measuring pressure have been analysed from the historical and practical points of view. The systems at present in use are criticised and a modification based on catheters with inflatable balloons is described. By this method precise manometry is obtained using a strong material. The patient can unplug the monitoring system without it having to be recalibrated later. Furthermore this system avoids errors which come from movements of the catheter, changes of temperature and accidental increases in pressures. Equally it will stand humidity and sterilisation by heat.
Adult↗