N. Bruder et al., A COMPARISON OF EXTRADURAL AND INTRAPARENCHYMATOUS INTRACRANIAL PRESSURES IN HEAD-INJURED PATIENTS, Intensive care medicine, 21(10), 1995, pp. 850-852
The reliability of extradural pressure measurements for the measure of
intracranial pressure (ICP) is still controversial. This study was un
dertaken to assess the limits of agreement between extradural and intr
aparenchymatous pressures using respectively the Plastimed extradural
sensor and the Camino fiberoptic system. The study took place in a neu
rosurgical intensive care unit. Ten head injured patients were include
d in the study, leading to the comparison of 1032 pairs of hourly ICP
values. Although the measures were significantly correlated, there was
no agreement between the two methods of ICP monitoring, Extradural pr
essure was higher than intraparenchymatous pressure (bias 9 mmHg; 95%
confidence interval of bias -9.8 to 27.8 mmHg). The lack of agreement
between the two methods is probably due to the unreliability of extrad
ural pressure for the measurement of ICP.