Adequacy of Anesthesia Accessories

The Adequacy of Anaesthesia* (AoA) concept helps clinicians deliver an individually tailored anaesthesia and may help in their goal to improve patients' outcomes, it’s made up of parameters including EntropyTM, Neuromuscular Transmission(NMT) and Surgical Pleth Index (SPI).

Deliver Individually Tailored Anesthesia

It can be difficult for anesthesiologists to determine the appropriate drug dosing for their patients. By utilizing both Entropy and Neuromuscular Transmission (NMT), together with other vital signs may help clinicians deliver individually tailored anesthesia and may help in their goal to improve patient outcomes. When used with monitored parameters, Entropy and NMT modules help give a more complete picture of a patient's status—all on one screen.<!-- It can be difficult for anesthesiologists to determine the appropriate drug dosing for their patients. By utilizing both Entropy and Neuromuscular Transmission (NMT), The Adequacy of Anesthesia concept together with other vital signs may help clinicians. When used with monitored parameters, Entropy and NMT modules help give a more complete picture of a patient's status—all on one screen.

According to the NAP5 report, the incidence of Accidental Awareness during General Anaesthesia (AAGA) is ~1:8,000 when neuromuscular blockade was used. They are associated with psychological consequences for the patients experiencing them, as 51% of episodes led to distress and 41% to longer-term psychological harm.¹

In order to help prevent such episodes, in particular when neuromuscular blockade is used or in patients who are judged to have high risk of AAGA for other reasons, the use of depth of anaesthesia monitoring, such as Entropy monitoring, is recommended.²

For more publications, check the Entropy Publications Reference List and Entropy quick guide.

Check out Entropy Accessories

_{4. NAP5 Report, September 2014
5.Depth of anaesthesia monitors, NICE diagnostics guidance [DG6], November 2012
6.Vakkuri A. et al. Spectral Entropy Monitoring Is Associated with Reduced Propofol Use and Faster Emergence in Propofol-Nitrous Oxide-Alfentanil Anaesthesia Anesthesiology 2005; 103:274-9.}

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Several studies reported fewer unwanted events, reduced opioid consumption, and shorter emergence from anaesthesia, when opioid administration was based upon monitoring of the nociceptive-anti-nociceptive balance.¹

The Surgical Pleth Index (SPI)* is a parameter that reacts to haemodynamic responses caused by surgical stimuli and analgesic medications. SPI is an algorithm that uses two components of the GE photoplethysmographic signal when measured on GE SpO₂ finger sensors only.

By observing the SPI value and trend, clinicians can monitor real time adult patients' responses to surgical stimuli and analgesic medications, thereby saving valuable time for optimization analgesia delivery.

The optimal SPI target has not been recommended yet as more studies need to prove the clinically relevant range of SPI measurements. However, in several studies, a range of [20; 50] has been considered for guiding opioids titration.^2,3

Published literature suggests that SPI-guided anaesthesia may result in lower remifentanil consumption, more stable haemodynamics and lower incidence of unwanted events.^2,4

Know more about how SPI works and its clinical benefits:

• Download the SPI white paper
• Check the SPI Publications Reference List

Check out SPI Accessories

_{1.Gruenewald and Ilies C. Monitoring the nociception-anti-nociception balance. Best Pract Res Clin Anaesthesiol. 2013 Jun;27(2):235-47. doi:10.1016/j.bpa.2013.06.007.
2.Chen et al.: Comparison of Surgical Stress Index-guided analgesia with standard clinical practice during routine general anaesthesia Anaesthesiology, V 112, No.5 2010.
3.Wennervirta et al. Surgical stress index as a measure of nociception/antinociception balance during general anaesthesia. Acta Anaesthesiol Scand 2008; 52: 1038-45
4.Bergmann I. and al. Surgical pleth index-guided remifentanil administration reduces remifentanil and propofol consumption and shortens recovery times in outpatient anaesthesia. BJA 110 (4): 622-8 (2013)}

Post-Operative Residual Curarization (PORC) incidence in post-anaesthesia care units (PACU) is estimated to be up to 45% after a single shot muscle relaxation¹. Considering that about 230 million patients undergo a major surgery each year, about 100 patients per minute would suffer from discomfort, reduced ventilation capacity, double vision, and a 4-to-5 times increased aspiration risk (see Fig X). Such residual effects have clinical consequences and complications that can prolong hospitalization, particularly in vulnerable populations such as obese patients.

^{Fig X.}

According to Prof. Jan Paul Mulier, AZ Sint Jan Hospital, Belgium, NMT monitoring is key to prevent respiratory complications in obese patients: listen to Prof. Jan Paul Mulier explaining why Neuromuscular Transmission monitoring is essential to optimize muscle relaxation in this challenging population.

Check out NMT Accessories

The configurable AoA split screen of GE's CARESCAPE modular monitors, combined with haemodynamic parameters and respiratory gas measurements, provides a comprehensive visual view of patient's status.

In the unique AoA split screen, you will find the BalanceView, which combines and plots Surgical Pleth Index (SPI) and SE values (one component of the Entropy measurement).

When seconds counts in an intensive and multitasking environment, the BalanceView is guidance for prompt visualization of the patients' responses to changes of anaesthesia conditions and may help save valuable time on responsiveness to analgesia/depth of anaesthesia optimization for each individual patient.

The "white dot" that moves drastically away from the target zone may indicate inadequate hypnosis or analgesia level.

How to interpret an increase in Heart Rate during general anaesthesia: hypnosis or analgesia?

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