Aspiration pneumonia during general anesthesia induction after esophagectomy: A case report

BACKGROUND Esophageal cancer is a common malignant tumor of the digestive system.At present,surgery is the most important treatment strategy.After esophagectomy and gastric esophagoplasty,the patients are prone to regurgitation.However,these patients currently do not receive much attention,especially from anesthesiologists.CASE SUMMARY A 55-year-old woman was scheduled for right lower lung lobectomy.The patient had undergone radical surgery for esophageal cancer under general anesthesia 6 mo prior.Although the patient had fasted for>17 h,unexpected aspiration still occurred during induction of general anesthesia.Throughout the operation,oxygen saturation was 98%-100%,but the airway pressure was high(35 cmH2O at double lung ventilation).The patient was sent to the intensive care unit after surgery.Bedside chest radiography was performed,which showed exudative lesions in both lungs compared with the preoperative image.After surgery,antibiotics were given to prevent lung infection.On day 2 in the intensive care unit,the patient was extubated and discharged on postoperative day 7 without complications related to aspiration pneumonia.CONCLUSION After esophagectomy,patients are prone to regurgitation.We recommend nasogastric tube placement followed by rapid sequence induction or conscious intubation.

Ultrasound Guidance and Nerve Stimulation Combined Versus Nerve Stimulation alone for Lumbar Plexus Block:A Randomized Controlled Trial

A nerve stimulation-guided lumbar plexus block is a well-established technique.It is not clear whether ultrasound guidance has additional value for this deep block technique.This study aimed to examine whether ultrasound guidance using a paramedian transverse scan through the intertransverse space(PMTS-ITS)approach in combination with nerve stimulation reduces the onset time of a complete sensory block.Forty-four patients who were scheduled to undergo arthroscopic knee surgery with an ultrasound visibility score(UVS)of≥10 for the lumbar plexus were enrolled and randomly allocated to the ultrasound guidance with nerve stimulation group(group U-N)or nerve stimulation group(group N)in this prospective,randomized,parallel-group,active-controlled study.The primary outcome was the onset time of a complete sensory block.The results showed that the onset time of a complete sensory block to pinprick and cold was 10(10–40)min and 10(10–40)min in group U-N,respectively,and 30(10–40)min and 20(10–40)min in group N(P=0.005,P=0.004),respectively.The performance time was 658±87 s in group U-N and 528±97 s in group N(P<0.001).There was no(0%)patient who required 5 or more needle passes in group U-N and 6(27.3%)in group N(P=0.028).The block failure rate was 9.1%in group U-N and 31.8%in group N(P>0.05).In conclusion,ultrasound guidance using the PMTS-ITS approach in combination with nerve stimulation led to a faster onset of a complete sensory block than nerve stimulation alone for a lumbar plexus block in patients with a UVS≥10.Ultrasound guidance with nerve stimulation significantly decreased the number of patients who required 5 or more needle passes.

Asymptomatic carbon dioxide embolism during transoral vestibular thyroidectomy:A case report

BACKGROUND Endoscopic thyroidectomy has obvious advantages over conventional surgical techniques in terms of postoperative cosmetic outcome.Although the incidence of carbon dioxide embolism(CDE)during endoscopic thyroidectomy is very low,it is potentially fatal.The clinical manifestations of CDE vary,and more attention should be paid to this disorder.CASE SUMMARY A 27-year-old man was scheduled for thyroidectomy by the transoral vestibular approach.The patient had no other diseases or surgical history.During the operation,he developed a CDE following inadvertent injury of the anterior jugular vein.The clinical manifestation in this patient was a transient sharp rise in end-tidal carbon dioxide,and his remaining vital signs were stable.In addition,loud coarse systolic and diastolic murmurs were heard over the precordium.The patient was discharged on day 4 after surgery without complications.CONCLUSION A transient sharp rise in end-tidal carbon dioxide is considered a helpful early sign of CDE during endoscopic thyroidectomy.

Numerical Approximation of Hopf Bifurcation for Tumor-Immune System Competition Model with Two Delays

This paper is concernedwith theHopf bifurcation analysis of tumor-immune system competition model with two delays.First,we discuss the stability of state points with different kinds of delays.Then,a sufficient condition to the existence of the Hopf bifurcation is derived with parameters at different points.Furthermore,under this condition,the stability and direction of bifurcation are determined by applying the normal form method and the center manifold theory.Finally,a kind of Runge-Kutta methods is given out to simulate the periodic solutions numerically.At last,some numerical experiments are given to match well with the main conclusion of this paper.