Abstract:
PURPOSE:This study demonstrated the effects of perfluorobutane (Sonazoid®) with contrast-enhanced ultrasonography (CEUS) to identify the spread of local anesthetics in ultrasound-guided nerve block. METHODS:This study consists of simulation, cadaveric, and animal studies. In a simulation study, 1% lidocaine with 10- to 1000-fold diluted Sonazoid®, a US-specific contrast agent to diagnose hepatic and breast cancers (0.5 mL), was injected into a resin-based phantom to determine the optimal concentration for ultrasound-guided peripheral nerve block. The enhanced area was measured by direct observation and ultrasonography (US). In the cadaver study, ultrasound-guided sciatic nerve block was performed at the popliteal fossa in the 9 extremities, and 5 mL of the optimally diluted Sonazoid® defined in the simulation study with X-ray contrast medium and blue dye was injected. Longitudinal spread of the solution was measured by CEUS, X-ray imaging and anatomical dissection. In the animal study, the optimally diluted Sonazoid® was injected around the sciatic nerve of rats (n = 6), and neuronal function and toxicity were evaluated by behavioral and histological estimation. RESULTS:The simulation study proved that 100-fold diluted Sonazoid® was the optimal concentration. In the cadaver study, CEUS and anatomical dissection (r = 0.90, P = 0.0020) or radiography (r = 0.84, P = 0.0072) showed high agreement and correlation with the longitudinal spread. CEUS clearly showed a fine intraneuronal injection image compared to the usual B-mode imaging. The animal study suggested no adverse effects by co-administration of lidocaine and Sonazoid®. CONCLUSIONS:CEUS with 100-fold diluted Sonazoid® could identify the spread of local anesthetic as well as radiography and anatomical dissection, and distinguish between intra- and extraneuronal injections without neurodegeneration.
journal_name
J Anesthjournal_title
Journal of anesthesiaauthors
Sasaki H,Yamauchi M,Ninomiya T,Tatsumi H,Yamakage Mdoi
10.1007/s00540-017-2347-xsubject
Has Abstractpub_date
2017-06-01 00:00:00pages
365-373issue
3eissn
0913-8668issn
1438-8359pii
10.1007/s00540-017-2347-xjournal_volume
31pub_type
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journal_title:Journal of anesthesia
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