Acceleromeiograph is a piezoelectric myograph used to measure the force generated by a muscle during nerve stimulation. Acceleromeiographs are used during anesthesia when prescribing muscle relaxants to measure the depth of neuromuscular blockade and assess the adequacy of recovery from these agents at the end of the operation. Acceleromemiography is classified as quantitative neuromuscular monitoring .
Content
Purpose
Patients who undergo anesthesia can receive a medication that paralyzes the muscles, facilitating endotracheal intubation and improving working conditions for the surgeon. Longer acting drugs have a higher prevalence of residual blockade in the PACU or ICU than shorter acting drugs. Various clinical tests have been described to measure or rule out signs of residual muscle weakness , but they cannot rule out postoperative residual curation . [1] Small degrees of muscle blockade can only be accurately measured using quantitative neuromuscular monitoring. In particular, the observer cannot reliably measure muscle attenuation when the ratio for a four-digit stimulation (TOF test) is in the range of 0.4 to 0.9. [2]
Design
Accelerometers measure muscle activity using a miniature piezoelectric transducer that is attached to a stimulated muscle. Tension is created when the muscle accelerates, and this acceleration is proportional to the force of contraction. The mass m of the piezoelectric transducer is known, and the acceleration a is measured, so the force can be calculated by the formula F = ma . Acceleromeiographs are more expensive than the more common contractions, but it has been shown to better eliminate residual blockade and its associated symptoms of muscle weakness and improve overall recovery quality.
See also
- Muscle relaxant
- Myograph
- Neuromuscular blocking drug
- Neuromuscular monitoring
Notes
- ↑ Residual neuromuscular block: lessons unlearned. Part II: methods to reduce the risk of residual weakness (English) // Anesth. Analg. : journal. - 2010 .-- July ( vol. 111 , no. 1 ). - P. 129-140 . - DOI : 10.1213 / ANE.0b013e3181da8312 . - PMID 20442261 .
- ↑ Tactile fade detection with hand or wrist stimulation using train-of-four, double-burst stimulation, 50-hertz tetanus, 100-hertz tetanus, and acceleromyography (English) // Anesth. Analg. : journal. - 2006 .-- May ( vol. 102 , no. 5 ). - P. 1578-1584 . - DOI : 10.1213 / 01.ane.0000204288.24395.38 . - PMID 16632846 .
External links
- Comparison of mechanomyography and accelerography at Respond2Articles.com.