Correlation and agreement between the bispectral index vs. state entropy during hypothermic cardio‐pulmonary bypass

Meybohm, Patrick; Gruenewald, Matthias; Höcker, Jan; Renner, Jochen; Graesner, Jan-Thorsten; Ilies, C.; Scholz, Jens; Bein, Berthold

doi:10.1111/j.1399-6576.2009.02138.x

Cited by 22 publications

(17 citation statements)

References 32 publications

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“…Generally, changes in entropy scores can reflect the effect of various contributors on cerebral function, including anesthetic concentration, cerebral blood flow, cerebral oxygen metabolism, and hypothermia, in patients with general anesthesia [567]. However, changes in the anesthesia depth, hypothermia, and cerebral hypoperfusion were unlikely to have reduced the SE because an effect-site propofol concentration of 3.0 µg/ml was maintained without temperature and hemodynamic changes during surgery.…”

Section: Discussionmentioning

confidence: 99%

Decrease in spectral entropy by low tidal volume ventilation-associated severe hypercapnia: a case report

Ann

Jung

Park

2017

Korean J Anesthesiol

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Severe hypercapnia can be predicted by a decrease in cerebral electrical activity. The authors describe a sudden decrease in spectral entropy due to severe hypercapnia-induced respiratory acidosis in a patient with chronic pulmonary obstructive disease during lung resection. After two and a half hours of low tidal volume ventilation in the lateral position, the state entropy suddenly dropped from 45 to 7, without any changes in the effect-site concentration of propofol, end-tidal carbon dioxide (CO2) tension, oxygen saturation, or arterial pressure. However, arterial blood gas analysis showed severe respiratory acidosis (pH 7.01, PaCO2 115 mmHg and PaO2 246 mmHg with FIO2 of 0.5). Immediate hyperventilation improved the state entropy and acid-base balance. Electroencephalography-based spectral entropy can detect severe hypercapnia in chronic pulmonary obstructive disease patients with a large arterial to end-tidal CO2 difference due to prolonged hypoventilation during thoracic surgery.

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Section: Discussionmentioning

confidence: 99%

Decrease in spectral entropy by low tidal volume ventilation-associated severe hypercapnia: a case report

Ann

Jung

Park

2017

Korean J Anesthesiol

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“…It has been used extensively in different types of cardiac surgery and also compared with different types of neuromonitoring modalities. BiS recording of patients undergoing cardiac surgery has also been studied with the aim of studying awareness under anaesthesia [4].…”

Section: Discussionmentioning

confidence: 99%

Changes in BiSpecteral Index (BiS) Values During Cardiopulmonary Bypass (CPB)

Sinha

Ramesh

Singh³

2011

Medical Journal Armed Forces India

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Background: BiSpecteral Index (BiS) monitoring is standard monitoring regimen in anaesthesia practice. It has also been used in cardiac surgery. It is especially important due to the high incidence 01 neurological injury or dysfunction that occurs following CPB. This is a retrospective stody of 33 cases that were monitored with BiS during the course of coronary artery or valvular surgery, including the period 01 CPB. Methods: Thirty three cases monitored with BiS were studied retrospectively. Result: From the recordings it was determined that the value of BiS which was ranging between 40 to 60 oller induction, dropped below 25 at the onset of CPB. This change was statistically significant (p<0.05). Conclusion: This decrease in the BiS value is probably a result of hypo-perfusion and due to clear, oxygen -poor priming flnid reaching the brnin. Other periods 01 hypotension also correlated with the low values of BiS. This cerebral hypoxia which would

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“…There is also inconclusive evidence why EEG-based DoA monitors perform inconsistently on hypothermic cardio-pulmonary bypass and during rewarming [26]. However, hypothermia and changing cerebral perfusion pattern do slow the cortical rhythm independently of suppression of the EEG induced by anaesthetic drugs acting via the gamma-amino butyric acid receptor.…”

Section: Key Pointsmentioning

confidence: 91%

Limitations of anaesthesia depth monitoring

Lobo

Schraag

2011

Current Opinion in Anaesthesiology

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Correlation and agreement between the bispectral index vs. state entropy during hypothermic cardio‐pulmonary bypass

Abstract: Acceptable agreement was observed between the BIS and entropy variables under normothermic but not under hypothermic conditions. The BIS and entropy variables may therefore not be interchangeable during a hypothermic cardio-pulmonary bypass.

Cited by 22 publications

References 32 publications

Decrease in spectral entropy by low tidal volume ventilation-associated severe hypercapnia: a case report

Decrease in spectral entropy by low tidal volume ventilation-associated severe hypercapnia: a case report

Changes in BiSpecteral Index (BiS) Values During Cardiopulmonary Bypass (CPB)

Limitations of anaesthesia depth monitoring

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