What Is Neuromuscular Transmission (NMT) Monitoring? Exploring NMT on the Bionet Brio X70 Patient Monitor
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In the operating room, clinicians monitor a range of parameters—including ECG, oxygen saturation, and blood pressure—to assess a patient’s condition.
But how do they assess the effects of neuromuscular blocking drugs and the patient’s recovery from them during general anesthesia?
In this article, we’ll introduce neuromuscular transmission (NMT) monitoring on the Bionet Brio X70 patient monitor, which uses electrical nerve stimulation to assess muscle responses. 🔎
How Is Neuromuscular Blockade Assessed During Surgery?
During general anesthesia, neuromuscular blocking drugs—often called muscle relaxants—may be used to facilitate endotracheal intubation or provide the muscle relaxation needed for surgery. Clinicians need to assess the depth of this blockade during the procedure and evaluate recovery as surgery comes to an end.
NMT stands for Neuromuscular Transmission, the process by which a nerve signals a muscle to contract.
NMT monitoring applies electrical stimulation to a peripheral nerve and measures the resulting muscle response, helping clinicians assess the degree of neuromuscular blockade and subsequent recovery.
Put simply, it checks how strongly a muscle responds to nerve stimulation. 🩺
TOF Ratio: A Key Measure of Neuromuscular Recovery
Patient movement and other clinical signs alone may not reliably reveal residual neuromuscular blockade—the lingering effects of neuromuscular blocking drugs.
The TOF ratio is a key quantitative measure used to assess neuromuscular recovery.
☝🏻 What’s the difference between TOF and the TOF ratio?
|
Term |
Meaning |
|
TOF (Train-of-Four) |
A stimulation pattern that delivers four electrical pulses to a nerve and assesses the resulting muscle responses. |
|
TOF ratio |
The size of the fourth muscle response relative to the first. |
TOF ratio = Fourth response (T4) ÷ First response (T1)
The 2023 American Society of Anesthesiologists (ASA) guidelines recommend quantitative neuromuscular monitoring at the adductor pollicis muscle, which moves the thumb toward the palm, and confirming recovery to a TOF ratio of at least 0.9 before extubation, or removal of the breathing tube.
This value alone, however, does not determine whether a patient is ready for extubation. Clinicians also consider breathing and other clinical findings as part of a comprehensive assessment.
When Is NMT Monitoring Used?
For patients receiving neuromuscular blocking drugs, assessment is needed throughout the procedure—from monitoring the depth of blockade during surgery to confirming recovery afterward.
1. Procedures requiring deep neuromuscular blockade
Muscle responses help clinicians assess whether the level of blockade meets the needs of the procedure.
2. Repeated assessment during prolonged general anesthesia
Ongoing assessments help clinicians track changes in the depth of neuromuscular blockade throughout anesthesia.
3. Assessment of recovery before extubation
Quantitative measurements help clinicians confirm adequate recovery from the effects of neuromuscular blocking drugs before the breathing tube is removed.
Throughout these stages, NMT monitoring provides information to support the clinical assessment of neuromuscular function.
Bionet Brio X70: From Vital Signs to Neuromuscular Monitoring
The Bionet Brio X70 patient monitor supports core monitoring parameters such as ECG, oxygen saturation (SpO₂), and noninvasive blood pressure (NIBP).
With its optional NMT capability, the Brio X70 also allows clinicians to assess neuromuscular responses.
Supported NMT stimulation modes
TOF · PTC · DBS · ST · TET
These stimulation modes support neuromuscular assessment across different clinical situations, allowing clinicians to review neuromuscular responses alongside the patient’s vital signs.
From assessing neuromuscular blockade during surgery to confirming recovery, explore how the Bionet Brio X70 supports neuromuscular monitoring.
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※ This content is provided for general informational purposes and does not replace clinical judgment. For details on product features and operation, please refer to the applicable user manual.
