OBJECTIVE Intraoperative localisation of the sensorimotor cortex using the phase reversal of somatosensory evoked potentials (SEPs) is an essential tool for surgery in and around the perirolandic gyri, but unsuccessful and perplexing results have been reported. This study examines the effect of tumour masses on the waveform characteristics and feasibility of SEP compared with functional neurona...

PURPOSE The effect of isoflurane on the subcortical P14 component of the median nerve somatosensory evoked potential (SEP) is poorly known. We studied whether the P14 wave from the upper brainstem, recorded with a nasopharyngeal electrode, was attenuated at the isoflurane-induced EEG burst-suppression level. We also compared the effect of isoflurane on the P14, cervical N13 and cortical N20, N3...

BACKGROUND Brachial monomelic amyotrophy (BMMA) is known to affect the central cervical cord gray matter resulting in single upper limb atrophy and weakness. SETTINGS AND DESIGN Case series of BMMA patients who underwent somatosensory evoked potentials (SEP) studies at a tertiary referral center. AIMS We proposed to record Multichannel Somatosensory Evoked Potentials (MCSSEP) from median an...

The development of cardiopulmonary resuscitation by Peter Safar and others has had the unintended consequence of increasing the number of patients surviving in coma from hypoxic-ischemic encephalopathy. Neurologists often assess the prognosis for functional recovery of these patients, communicate this prognostic information to the patient’s family, and help manage the patient through the initia...

Observations of the temporal and spatial distribution of N,.O in solution are not yet sufficient topermit quantitative assessment of the role of the ocean in the budget of atmospheric N,.O. Consideration of the global nitrogen cycle suggests hat the land should be the primary source of N20. The gas is removed in the atmosphere by photolysis and by reaction with O(•D), and there may be additiona...

BackgroundBilaterally absent pupillary light reflexes (PLR) or N20 waves of short-latency evoked potentials (SSEPs) are recommended by the 2015 ERC-ESICM guidelines as robust, first-line predictors poor neurological outcome after cardiac arrest. However, recent evidence shows that false positive rates (FPRs) these tests may be higher than previously reported. We investigated if testing accuracy...