Anesthesia and analgesia
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Anesthesia and analgesia · Apr 2016
Randomized Controlled TrialAn Evaluation of Ultrasound-Guided Adductor Canal Blockade for Postoperative Analgesia After Medial Unicondylar Knee Arthroplasty.
Unicondylar knee arthroplasty (UKA) is a commonly performed procedure with significant expected postoperative pain. Peripheral nerve blocks are 1 analgesic option, but some approaches may decrease quadriceps motor strength and interfere with early ambulation. In this study, we compared the analgesia provided by an adductor canal block (ACB) and a psoas compartment block (PCB) after UKA. We hypothesized that the ACB would provide equivalent analgesia, defined as a difference of <2 points on the pain scale (0-10 numeric rating scale [NRS]), at rest and with movement 6 hours after block placement. ⋯ An ACB provides equivalent analgesia after medial UKA when compared with a PCB. In addition, the ACB caused significantly less motor weakness. An ACB should be considered for postoperative analgesia after medial UKA.
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Anesthesia and analgesia · Apr 2016
An Evaluation of Induced Failure Modes in the Belmont® Rapid Infuser.
Rapid infusers are vital tools during massive hemorrhage and resuscitation. Sporadic reports of overheating and shutdown of the Belmont® Rapid Infuser, a commonly used system, have been attributed to 1-sided clot blockage of the fluid path. We investigated multiple causes of failure of this device. ⋯ Clot-based occlusion can be induced in the Belmont Rapid Infuser under unrealistic conditions. In the absence of complete unilateral flow blockage, we did not observe any significant overheating of the infuser under extreme operating conditions.
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Anesthesia and analgesia · Apr 2016
Lidocaine Inhibits HCN Currents in Rat Spinal Substantia Gelatinosa Neurons.
Lidocaine, which blocks voltage-gated sodium channels, is widely used in surgical anesthesia and pain management. Recently, it has been proposed that the hyperpolarization-activated cyclic nucleotide (HCN) channel is one of the other novel targets of lidocaine. Substantia gelatinosa in the spinal dorsal horn, which plays key roles in modulating nociceptive information from primary afferents, comprises heterogeneous interneurons that can be electrophysiologically categorized by firing pattern. Our previous study demonstrated that a substantial proportion of substantia gelatinosa neurons reveal the presence of HCN current (Ih); however, the roles of lidocaine and HCN channel expression in different types of substantia gelatinosa neurons remain unclear. ⋯ Our studies demonstrate that lidocaine strongly inhibits Ih in a reversible and concentration-dependent manner in substantia gelatinosa neurons, independent of tetrodotoxin-sensitive sodium channels. Thus, our study provides new insight into the mechanism underlying the central analgesic effect of the systemic administration of lidocaine.
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Anesthesia and analgesia · Apr 2016
Randomized Controlled Trial Multicenter StudyAmnesia of the Operating Room in the B-Unaware and BAG-RECALL Clinical Trials.
Midazolam administered in the preoperative waiting area produces amnesia of the operating room in 60% of patients.
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Anesthesia and analgesia · Apr 2016
Randomized Controlled Trial Comparative StudyDexmedetomidine Combined with General Anesthesia Provides Similar Intraoperative Stress Response Reduction When Compared with a Combined General and Epidural Anesthetic Technique.
Epidural anesthesia may attenuate the sympathetic hyperactivity and stress response from surgery. In this study, we compared the stress response, hemodynamic variables, and recovery profiles of patients undergoing total IV anesthesia (TIVA) and intraoperative dexmedetomidine with those receiving epidural anesthesia and TIVA. ⋯ When used in conjunction with TIVA, intraoperative dexmedetomidine blunts surgical stress responses to an extent comparable to combined epidural and general anesthesia without compromising hemodynamic stability and with minimal adverse effects during the intraoperative period.