Toward a unified monitoring system during anesthesia

Pearlman, A.; Gurman, Gabriel M.

doi:10.1007/bf02915869

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The display of the vast amount of data collected is of paramount importance and yet a 'unified' display without the hazards of 'too many screens' (3) has not yet been satisfactorily demonstrated. Naqvi (4) in 1983 monitored noninvasive arterial pressure and heart rate, temperature and peak concentration of expired carbon dioxide, but these data were 'displayed on the screen in a graphic form in the same way as on the traditional anaesthetic record'.…”

Section: Discussionmentioning

confidence: 99%

Physiological data display during anaesthesia

Harrison¹

1986

International Journal of Clinical Monitoring and Computing

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Section: Discussionmentioning

confidence: 99%

Physiological data display during anaesthesia

Harrison¹

1986

International Journal of Clinical Monitoring and Computing

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“…The video display showed the trended EEG spectrum and amplitude, the real-time EEG record, and the trended display of additional parameters (e.g. FHR, uterine contraction, and maternal blood pressure) as was previously described (12). The numerical values of all recorded variables were displayed above their respective time plots (12).…”

Section: Methodsmentioning

confidence: 99%

“…FHR, uterine contraction, and maternal blood pressure) as was previously described (12). The numerical values of all recorded variables were displayed above their respective time plots (12). The user controlled the system via a menu-driven keypad.…”

Section: Methodsmentioning

confidence: 99%

Real-Time Spectral Analysis of the Fetal EEG: A New Approach to Monitoring Sleep States and Fetal Condition during Labor

2000

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Adverse perinatal events affecting cerebral functions are a major cause of neonatal mortality, morbidity, and long-term neurologic deficit. Intrapartum fetal EEG, which records fetal brain electrical activity, provides a monitoring modality for evaluating the fetal CNS during labor. In this study, we describe a new approach to such monitoring that is based on real-time spectral analysis of the fetal EEG during labor. Fourteen pregnant women with uncomplicated term pregnancies who went into labor participated in the study. Two suction-cup electrodes were applied to the fetal scalp at the occipitoparietal or parietal region after rupture of membranes. Real-time spectral analysis was used to determine the frequency and amplitude of the fetal EEG signal. The spectral edge frequency (SEF) was calculated as the frequency below which 90% of the power in the power spectrum resides. The average EEG amplitude and the SEF were displayed using the density spectral array technique. Fetal heart rate and intrauterine pressure were also measured. Two fundamental EEG patterns were identified: high-voltage slow activity and lowvoltage fast activity. The SEF was found to be an excellent index of cyclic EEG activity. Fetal heart rate demonstrated increased variability and an elevated baseline during low-voltage fast activity, whereas both parameters decreased during high-voltage slow activity. During episodes of variable decelerations in the fetal heart rate, a decrease in the SEF was observed, accompanied by an increased EEG voltage. The results obtained substantiate the presence of sleep cycles in the human fetus. This kind of cortical activity monitoring may enable rapid alertness to cerebral hypoxia and allow for prompt intervention, thereby decreasing the risk for birth asphyxia and subsequent brain damage. Abbreviations SEF, spectral edge frequency DSA, density spectral array FHR, fetal heart rate IUP, intrauterine pressure HVSA, high-voltage slow activity LVFA, low-voltage fast activity Normal function of the fetal CNS is of paramount importance to the quality of life after birth. Methods for assessing the normality or abnormality of the CNS function before birth are required to perform this sort of fetal evaluation. Fetal EEG, which records fetal brain electrical activity, can be used to measure CNS function. Methods for continuous monitoring of the fetal EEG were previously described, both in mature and premature fetuses (1, 2). Various EEG patterns were recognized, both transient and nontransient, that were found to be associated with intrapartum events and also with neurologic abnormalities at 1 y of age (3, 4). These observations were based on visual analysis of the fetal EEG records, which presented many methodologic as well as interpretative problems, precluding clinical acceptance of this monitoring modality. In recent years, automated methods for EEG scoring and coding for EEG states have been proposed (5-8). Such methods are objective and offer greater consistency of pattern recognition while facilitating processin...

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Does Spectral Edge Frequency Assess Depth of Anesthesia?

Gurman¹

1986

Central Nervous System Monitoring in Anesthesia and Intensive Care

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Toward a unified monitoring system during anesthesia

Cited by 3 publications

References 7 publications

Physiological data display during anaesthesia

Physiological data display during anaesthesia

Real-Time Spectral Analysis of the Fetal EEG: A New Approach to Monitoring Sleep States and Fetal Condition during Labor

Does Spectral Edge Frequency Assess Depth of Anesthesia?

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