Based on the field outcrops surveyed, combined with recent published the regional tectonic evolution and geochronology data, we analyzed the lithologies and rock associations of strata, identified the sedimentary facies types, and discussed the distribution sedimentary facies and the hydrocarbon accumulation in the eastern Qiangtang basin during the Late Triassic-Jurassic. Marked by regional unconformities, there are two tectono-stratigraphic units (from the Carnian to the Norian and from the Rhaetian to the Kimmeridgian, respectively) in the eastern part of Qiangtang basin. We systematically described the distribution range, thickness variation and lithological characteristics of different formations in the tectonostratigraphic units. The Late Triassic-Jurassic is dominated by marine facies and marine-continental transitional facies. The marine-continental transitional facies include deltaic and tidallagoon facies. Marine facies including gentle carbonate slope, evaporative platform, restricted platform, littoral, neritic, bathyal and abysmal facies. The Carnian stage is dominated by littoralneritic-bathyal-abysmal facies in the north Qiangtang depression otherwise the littoral-neritic facies in the south Qiangtang depression. The early Norian stage is dominated by carbonate gentle slope-mixed continental shelf facies. The late Norian, Bajocian, Callovian and Kimmeridgian stage are dominated by tidal flat-delta facies in the north Qiangtang depression and littoral-neritic facies in the south Qiangtang depression. The Bathonian and Oxfordian stage are dominated by evaporative platform-restricted platform-mixed continental shelf facies. The sedimentary facies formed zones from north to south and extended in an E-W direction. The Eastern Lower Uplift (ELU) played an important role in the division zones of sedimentary facies from north to south. During the Bathonian and Oxfordian, the ELU developed below the sea level and controlled the distribution of restricted platform, evaporative platform and platform margin. We analyzed 20 source rock samples from the upper Triassic-Jurassic. The total organic carbon (TOC) value from Qoimaco, Buqu and Adula Formations. of late Triassic-Jurassic in the eastern Qiangtang basin are ranges from 0.17~0.33% (average 0.28%), 0.05~0.25% (average 0.15%) and 10.32~28.78% (average 19.33%), respectively. Obviously, the Adula Fm. developed good source rocks. The values of Tmax and S 1 +S 2 in the Adula formation are 459-461℃ (average 460℃) and 6.75-28.55 mg/g (average 18.18mg/g), indicating that the Adula source rock has reached high-over-maturity stage. The bathyal, gentle slop and platform facie belts of the Upper Triassic can configurate the good hydrocarbon prospects in the northeastern area of the Qiangtang basin.
ObjectivesUnrecognised malposition of the endotracheal tube can lead to severe complications in patients under general anaesthesia. The purpose of this study was to verify the feasibility of using ultrasound to measure the distance between the upper edge of saline-inflated cuff and the vocal cords.DesignProspective case-control study.SettingA tertiary hospital in Beijing, China.MethodsIn this prospective study, 105 adult patients who required general anaesthesia were enrolled. Prior to induction, ultrasound was used to identify the position of the vocal cords. After intubation, the endotracheal tube (ETT) was fixed at a depth of 23 cm at the upper incisors in men and 21 cm in women. The depth of intubation was verified by video-assisted laryngoscopy. The distance between the upper edge of the saline-inflated cuff and the vocal cords was measured by ultrasound; the ideal distance was considered to be 1.9–4.1 cm.ResultsAmong the 105 cases, two cuffs were too close to the vocal cords and one too far away from the vocal cords. These diagnoses were made by ultrasound and were in agreement with results from direct laryngoscopy. The overall accuracy of ultrasound in identifying malposition of the cuff was 100.0% (95% CI: 96.6% to 100%). The sensitivity, specificity, positive predictive value and negative predictive value of ultrasound were, respectively, 100% (95% CI: 96.5% to 100%), 100% (95% CI: 29.2% to 100%), 100% (95% CI: 96.5% to 100%) and 100% (95% CI: 29.2% to 100%).ConclusionIdentification of the upper edge of the saline-inflated cuff and the vocal cords by ultrasound to assess the location of the ETT is a reliable method. It can be used to avoid malposition of the ETT cuff and reduce the incidence of vocal cords injury after intubation.Trial registration numberChiCTR-DDD-17011048.
Purpose Cesarean section (C-section) is associated with moderate-to-severe postoperative pain. Many studies on pain management after C-section have been published in recent decades, many of which focused on new regional techniques. The purpose of this study is to outline the connections within the dynamic evolution of postcesarean delivery analgesia research publications using retrospective bibliometric analysis. Patients and Methods Published studies on postoperative pain management of C-section were retrieved from the Science Citation Index Expanded (SCI-E) of Web of Science (WOS) Core collection database. All papers published from 1978 to October 22, 2022 were searched. The research progress and growing trend were quantitatively analyzed by total publications, research institutions, journal impact factors, and author’s contribution. Total citations frequency, average citations per item and h-index were used for evaluating literature quantity. Top 20 journals with the highest number of publications were charted. The keywords co-occurrence overlay map was visualized by the VOSviewer software. Results From 1978 to 2022, a total of 1032 articles in postcesarean delivery analgesia research field were published, with 23,813 times cited, average citations of 23.07 per item, and an h-index of 68. The most high-yield publication year, countries, journals, authors, institutions were 2020 (n=79), the United States (n=288), Anesthesia and Analgesia (n=108), Carvalho B (n=25), and Stanford University (n=33), respectively. The United States had the most cited papers. The future research interest might be “prescription”, “quadratus lumborum block”, “postnatal depression”, “persistent pain”, “dexmedetomidine”, “enhanced recovery”, and “multimodal analgesia”. Conclusion By employing the online bibliometric tool and VOSviewer software, we found that studies on postcesarean analgesia had grown markedly. The focus had evolved to nerve block, postnatal depression, persistent pain, and enhanced recovery.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.