Abstract
Simultaneous and continuous recordings of EEG, ECG and blood pressure were performed on 12 patients during routine fractional pneumoencephalography with a standardized technique. The fractional insufflations of air were followed by a significant rise of the systolic and diastolic blood pressures and a significant decrease of the cardiac rate in the sense of a Cushing response. The onset and time duration of these vasomotor reactions corresponded to the well known air induced and transient elevation of the cerebrospinal fluid pressure. The circulatory response was more pronounced in one patient with an encephalographically proven convexity block which is considered to be due to an increased cerebrospinal fluid outflow resistance. In contrast, lumbar punctures were followed by a transient tachycardia and a less pronounced elevation of the blood pressure as a manifestation of a general stress reaction. There were no constant and reproducible EEG changes provoked by the air insufflations.
Published Version
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