Κυριακή 1 Ιανουαρίου 2023

Weekly Symptom Profiles of Non‐hospitalized Individuals Infected with SARS‐CoV‐2 During the Omicron Outbreak in Hong Kong: A Retrospective Observational Study from a Telemedicine Centre

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Abstract

Background

Omicron BA.2.2 is the dominant variant in Hong Kong outbreak since December-31 2021. There is no study reporting the weekly symptom profile after infection.

Methods

In this retrospective study, participants who tested positive for SARS-CoV-2 after December-31 2021 and registered in the telemedicine system between March 14-May 6 2022 were analysed.

Findings

Among registered 12950 self-quarantined COVID-19 positive patients, 11776 symptomatic patients were included for weekly symptom profile analysis. 4718 (40.1%) patients reported symptoms in the first week after positive test, 2501 (21.2%) in the second week, 1498 (12.7%) in the third week, 1048 (8.9%) in the fourth week, and 2011 (17.1%) in over four weeks. Cough was the most common symptom in all participants. Patients in the first week had higher odds of reporting fever (0.206, 95% CI 0.161-0.263, p<0.001) and sore throat (0.228, 95% CI 0.208-0.252, p<0.001). Patients in over 4 weeks had a higher odds of reporting fatigue (1.263, 95% CI 1.139-1.402, p<0.001). Further, having at least two vaccine doses linked to lower odds of having fever (0.675, 95% CI 0.562-0.811, p<0.001), but not associated with the presence of cough and fatigue. Diabetic patients had higher odds of reporting diarrhea (1.637, 95% CI 1.351-1.982, p<0.001).

Conclusion

Symptoms from omicron infection may last for more than four weeks and symptom profiles vary from week to week. Vaccination and comorbidity affect the symptom profiles.

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Outpatient parotidectomy with or without the use of a post‐operative drain: a retrospective bi‐institutional study

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Abstract

Objective

Parotid surgery is historically performed as an inpatient procedure and suctions drains are predominantly used during surgery. Recent literature provides evidence that outpatient parotid surgery is safe and effective. Our study aims to describe the results of drainless outpatient parotidectomy and outpatient parotidectomy with drain placement and compare their outcomes.

Design

Retrospective cohort study

Participants

Patients that underwent outpatient drain-less parotidectomy and patients that underwent outpatient parotidectomy with post-operative drain placement.

Results

Three hundred eighty patients underwent outpatient parotidectomy with drain placement and 31 patients underwent outpatient drainless parotidectomy in two different hospitals. The incidence of hematoma (drain: 3.1% vs. drainless: 0%, p=1), infection (drain: 14.3% vs. drainless: 13.8%, p=1), and salivary fistula (drain: 5.6% vs. drainless: 3.4, p=1) were comparable between both groups. Seroma or sialocele was more frequently seen in the drain-less group (27.6% vs. 6.2%, p<0.001), but were all managed conservatively. Within ten days after surgery, unplanned visits seemed more frequent in the drain group, although the difference was not statistically significant (14.9% vs. 3.4%, p=0.16).

Conclusions

Outpatient parotid surgery with or without the use of a post-operative drain is safe, practical, and feasible. Same-day discharge with and without drain placement yield comparable outcomes. However, the results need to be interpreted cautiously as this study was limited by a small cohort of parotidectomies without drain placement. Future studies should further compare both approaches.

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H‐Type Tracheoesophageal Fistula Cannulation for Rapid Intraoperative Localization

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H-Type Tracheoesophageal Fistula Cannulation for Rapid Intraoperative Localization

Various techniques for tracheoesophageal fistula cannulation have been reported. In this case, we created a loop using a plastic catheter. The loop allowed us to create traction for rapid intraoperative localization and to pull a difficult-to-reach fistula, superiorly into the neck, to be reached through a cervical approach. Laryngoscope, 2022


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Prognostic significance of head and neck spindle cell carcinoma

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Abstract

Background

Our study investigates the prognostic significance of spindle cell histology on overall survival (OS) of conventional head and neck squamous cell carcinoma (HNSCC).

Methods

The 2004 to 2017 National Cancer Database was queried for patients with head and neck spindle cell carcinoma (HNSpCC) (n = 1572) or HNSCC (n = 242 697) of the oral cavity, major salivary glands, sinonasal tract, oropharynx, hypopharynx, and larynx treated with curative intent.

Results

Patients with HNSpCC presented more frequently with higher-grade tumors and cN0 disease than those with HNSCC (p < 0.001). In the oral cavity, the HR for death for SpCC compared with SCC was 1.33 (p < 0.001). In the oropharynx, the HR for death for SpCC compared with SCC was 1.47 (p = 0.028).

Conclusions

After adjusting for patient, tumor, and treatment characteristics, SpCC histology had an independent adverse prognostic effect on OS in the oral cavity and oropharynx. SpCC histology does not necessarily portend poorer survival in all HNSCC.

Level of Evidence: 4.

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Clinical evaluation and patient related outcomes of one‐ and two‐piece zirconia implants at five years of loading: A case series study

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Abstract

Objective

The objective of this study was to investigate the survival and biological and mechanical complications of one-piece and two-piece zirconia implants at five years of loading.

Materials and Methods

Consecutive patients receiving zirconia implants were studied, collecting data at five years of loading on their clinical history, peri-implant health status, mechanical complications, esthetic results, and patient related outcomes.

Results

The study included 18 patients with 29 implants. The survival rate was 86% in implant-based analysis and 78% in patient-based analysis. There were no cases of peri-implantitis, but mucositis was present in 53% of implants. A mean of 4.1 ± 0.81 mm was obtained for probing depth and 1.6 ± 0.9 mm for crestal bone loss (radiographic assessment). There were no implant fractures. Major (10%) and minor (10%) prosthesis complications were observed. The esthetic outcome was moderate to almost perfect, with a high level of patient satisfaction. No significant association was found between survival rate and the presence of mucositis around one- or two-piece implants or any other study variable.

Conclusions

The survival rate is low for one- and two-piece zirconia implants. Both types of implants demonstrated a low mechanical complication rate. The incidence of periimplantitis is low but mucositis is present in 50%. Patient satisfaction related to esthetics and function is moderate to high. They represent a good option for patients requiring an alternative to titanium implants.

Clinical Relevance

Zirconia implants appear to be an alternative to the titanium option and may be indicated for patients requiring "metal-free" restorations.

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DSCS, a New Cell Line Developed in vitro From Human Stem Cells of the Apical Papilla

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Abstract

Aim

To establish and fully characterize a new cell line from human stem cells of the apical papilla (SCAPs) through immortalization with an SV40 large T antigen.

Methodology

Human SCAPs were isolated and transfected with an SV40 large T antigen and treated with puromycin to select the infected population. Expression of human mesenchymal surface markers CD73, CD90 and CD105 was assessed in the new cell line named Dental Stem Cells SV40 (DSCS) by flow cytometry at early and late passages. Cell and proliferation were also analysed. To evaluate trilineage differentiation; quantitative polymerase chain reaction and histological staining were performed.

Results

DSCS cell flow cytometry confirmed expression of mesenchymal surface markers even in late passages (100% positive for CD73 and CD90 and 98.9% for CD105 at passage (P) 25). Fewer than 0.5% were positive for haematopoietic cell markers (CD45 and CD34). DSCS cells also showed increased proliferation when compared with the primary culture after 48 h, with a doubling time of 23.46 h for DSCS cells and 40.31 h for SCAPs, and retained the capacity to grow for >45 passages (150 population doubling) and their spindle shape morphology. Trilineage differentiation potential was confirmed through histochemical staining and gene expression of the chondrogenic markers SOX9 and COL2A1, adipogenic markers CEBPA and LPL, and osteogenic markers COL1A1 and ALPL.

Conclusions

The new cell line derived from human SCAPs has multipotency, retains its morphology and expression of mesenchymal surface markers, and shows higher proliferative capacity even at late passages (P45). DSCS cells can be used for in vitro study of root development and to achieve better understanding of the regenerative mechanisms.

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Three‐point sectional‐cast digital method for transferring the interocclusal relationship for full‐mouth rehabilitation of worn dentition

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Abstract

For full-mouth rehabilitation of worn dentition, "diagnostic" interim restorations are required to reestablish the interocclusal relationship. It is important but challenging to transfer the interocclusal relationship, and to map the basic form and contour of interim restorations to the final restorations. Alignment of interim restorations and working casts is difficult when using digital workflows because of a lack of consistent hard tissue reference points. The digital workflow presented in this study used a "3-point sectional-cast digital cross-mounting method" to transfer the interocclusal relationship during full-mouth rehabilitation. An intermediate cast was made with 3 interim restorations: 1 on an incisor and 2 on molars. The interocclusal relationship and occlusal morphologies of the diagnostic interim prostheses were transferred and aligned to working casts using the 3-point sectional casts.

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