By J. P. Evans (auth.), M. Brock, H. Dietz (eds.)
This quantity includes the papers offered on the First overseas .ijm posium on Intracranial strain, held on the Neurosurgical health facility of the Medizi nische Hochschule Hannover (Hannover scientific School), July 27 to 29, 1972. The texts submitted were integrated of their unique shape every time attainable. The editors have made simply minor corrections and rearrangements, considering the fact that quick book was once thought of to be extra very important than homoge neity standard. The periods of this e-book correspond to the periods of the sym posium. on the finish of every consultation the reader will discover a precis of the themes offered and mentioned, specially ready by way of the chairman and co-chairman involved. 3 major facets ofICP have been handled on the Symposium: method (Sessions 1 and 2), Pathophysiology (Sessions three to 6), and medical features (Ses sions 7 to 10). Following the symposium a unique around desk was once hung on the key themes lined by way of the assembly. The members of this around desk mentioned drafts ready by way of T. W. LANGFITT, B. JENNETT and N. LUNDBERG. those contributions have additionally been incorporated as particular chapters on the finish of this booklet, and are believed to mirror the present attitudes as to the themes discussed.
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Additional resources for Intracranial Pressure: Experimental and Clinical Aspects
Dural wedge-pressure increasing by 5 mmHg per 50 mmHg increase in EDP. Comparative Clinical Studies of Epidural and Ventricular Pressure 45 This equation will correct approximately for the dural wedge pressure, which increases as EDP rises, and also for a zero-point drift of 5 mmHg, but only within the first 24 h. The accuracy of the calculated VP will be ± 5 mmHg if EDP is below 50 mmHg, ± 10 mmHg for EDP above 50 mmHg. This means that its accuracy is clinically acceptable only in short-term recordings of pressures in the higher range.
Long-term pressure drift does not occur since glass is relatively free of elastic anomalies and exhibits no creep or changes of spring constant over many decades . Glass is also inert and non-irritating to tissues. The 1000 cycles-per-second mechanical resonant frequency of the capsule is more than adequate for measurement of intracranial pressure variations. 5 mm H 20 to be recorded. The 20 E. R. OLSEN and C. C. COLLINS: Passive Radio Telemetry resonant radiofrequency is in the region of 100 MHz; pressure sensitivity is 100 KHz.
Transmission of increased intracranial pressure II. J. Neurosurg. 21, 998-1005 (1964). 2. , NEVIS, A. : Experimental approach for monitoring surface brain pressure. ]. Neurosurg. 34, 38-47 (1971). 3. : Miniature transducer for intracranial pressure monitoring in man. Acta neural. scand. 46, 203-214 (1970). 4. : Continuous recording of ventricular fluid pressure. Acta psychiat. scand. (Suppl. 149) 36, (1960). 5. DORSCH, N. W. C, STEPHENS, R. : An intracranial pressure transducer. Bio-med. Engng.