Virtual histology: does it add anything?

Does bispectral analysis of the electroencephalogram add anything but complexity?

BACKGROUND Analysis of the bispectrum of EEG waveforms is a component of the proprietary BIS index-a commonly used commercial monitor of depth of anaesthesia. Does the use of the bispectrum give more information about depth of anaesthesia than the power spectrum? METHODS We collected and analysed EEG waveforms during induction of general anaesthesia in 39 patients, comparing the changes in bi...

Negative exercise stress test Does it mean anything?

Introduction Despite its low sensitivity and specificity (67% and 72%, respectively), exercise testing has remained one of the most widely used noninvasive tests to determine the prognosis in patients with suspected or established coronary disease. As a screening test for coronary artery disease, the exercise stress test is useful in that it is relatively simple and inexpensive. It has been con...

EEG in neurological conditions other than epilepsy: when does it help, what does it add?

Correspondence to: Dr Shelagh Smith, Department of Clinical Neurophysiology, The National Hospital, Queen Square, London WC1N 3BG, UK; shelaghs@epilepsynse. org.uk _________________________ A lthough the electroencephalogram (EEG) is a reliable test to assess cerebral function, its value in diagnosis and evaluation of neurological conditions apart from epilepsy has been largely superceded in re...

CORBA Fault-Tolerance: Why It Does Not Add Up

Many industries are taking CORBA seriously and envisage the development of critical distributed applications following this standard. We examine the utility of using the CORBA transaction and replication services to provide end-to-end reliability and high-availability in three-tier applications. We document issues in using the individual services. Perhaps more importantly, we point out diiculti...

A New Monitor of Pressure Autoregulation: What Does It Add?