Global analysis of a juvenile-adult model for cannibalistic species

2021 ◽  
pp. 2150045
Author(s):  
Xiong Li ◽  
Qihua Huang
Keyword(s):  
Global Analysis ◽  
Global Dynamics ◽  
Type I ◽  
Long Term Outcomes ◽  
Structured Population Model ◽  
Structured Population ◽  
Bistable Dynamics ◽  
Boundary Equilibrium ◽  
Adult Model

Cannibalism is a life trait occurring in a wide variety of species. To describe the population dynamics of cannibalistic species, we develop a stage-structured population model in which adults prey on juveniles with a Holling type I functional response. We make a rigorous analysis of the global dynamics in the model. The results of theoretical analysis show that the model has no boundary equilibrium other than the extinction one since juveniles and adults are cooperative (adults reproduce juveniles and juveniles grow into adults). Under certain conditions, the model has multiple interior equilibria and exhibits several types of bistable dynamics, in which different initial densities of juveniles and adults produce different long-term outcomes.

Long-term outcomes of Boston keratoprosthesis type I: the Chinese People’s Liberation Army General Hospital experience

2021 ◽  
pp. bjophthalmol-2019-315617
Author(s):  
Li-Qiang Wang ◽  
Teng-Yun Wu ◽  
Xiao-Niao Chen ◽  
Ze-Quan Xu ◽  
Min Yang ◽  
...  
Keyword(s):  
General Hospital ◽  
Ocular Surface ◽  
Retention Rate ◽  
Case Series ◽  
Type I ◽  
Long Term Outcomes ◽  
Boston Keratoprosthesis ◽  
People's Liberation Army ◽  
People’S Liberation Army

PurposeTo report the long-term outcomes of Boston keratoprosthesis type I (B-KPro type I) implantation in the management of severe ocular surface disorders.MethodsRetrospective case series. Patients who underwent B-KPro type I implantation at the People’s Liberation Army General Hospital were enrolled between March 2011 and September 2019. Data regarding visual acuity (VA), B-KPro type I retention and postoperative complications were recorded and analysed.ResultsA total of 103 eyes of 100 patients who underwent B-KPro type I implantation were included. The main indications were chemical burn (59.2%), ocular trauma (25.2%), herpetic keratitis (11.7%) and autoimmune diseases (3.9%). The percentage of eyes with postoperative VA of 10/200 or better was 82.7% at 6 months, 82.8% at 12 months, 77.9% at 2 years, 72.4% at 3 years, 71.1% at 4 years, 69.4% at 5 years, 58.9% at 6 years, 56.8% at 7 years and 42.9% at 8 years. Preoperatively, 8.7% eyes were diagnosed with new-onset glaucoma. Retroprosthetic membrane formation occurred in 19.4% eye. Corneal melting occurred in 18.4% eyes. Sterile vitritis was diagnosed in 4.9% eyes and infectious endophthalmitis in 2.9% eyes. Retinal detachment occurred in 0.9% eyes.ConclusionsIn a Chinese patient group, B-KPro type I is a viable option for treating severe ocular surface disorders in eyes where conventional keratoplasty would have a poor prognosis, especially in patients with chemical and thermal burns. Improved visual outcomes and high retention rate can be achieved and maintained in most cases.

Short- and Long-term Outcomes of Children with Complex Regional Pain Syndrome Type I Treated with Exercise Therapy

1999 ◽  
Vol 15 (3) ◽  
pp. 218-223 ◽  
Author(s):  
David D. Sherry ◽  
Carol A. Wallace ◽  
Claudia Kelley ◽  
Monica Kidder ◽  
Lyn Sapp
Keyword(s):  
Complex Regional Pain Syndrome ◽  
Exercise Therapy ◽  
Pain Syndrome ◽  
Type I ◽  
Syndrome Type ◽  
Long Term Outcomes ◽  
Short And Long Term

scholarly journals Long‐term outcomes of treatment with different stent grafts in acute DeBakey type I aortic dissection

2020 ◽  
Vol 35 (11) ◽  
pp. 3078-3087
Author(s):  
Qingsong Wu ◽  
Jun Xiao ◽  
Zhihuang Qiu ◽  
Liangliang Yan ◽  
Yue Shen ◽  
...  
Keyword(s):  
Aortic Dissection ◽  
Type I ◽  
Stent Grafts ◽  
Long Term Outcomes

Long‐term outcomes of individualized treatment strategy in treatment of type I Budd‐Chiari syndrome in 456 patients

2019 ◽  
Vol 39 (8) ◽  
pp. 1577-1586 ◽  
Author(s):  
Peng‐Xu Ding ◽  
Xin‐Wei Han ◽  
Chao Liu ◽  
Yan Zhang ◽  
An‐Ling Cheng ◽  
...  
Keyword(s):  
Treatment Strategy ◽  
Individualized Treatment ◽  
Type I ◽  
Budd Chiari Syndrome ◽  
Long Term Outcomes ◽  
Chiari Syndrome

Long-Term Outcomes of the Boston Type I Keratoprosthesis in the Management of Corneal Limbal Stem Cell Deficiency

Cornea ◽  
2016 ◽  
Vol 35 (9) ◽  
pp. 1156-1164 ◽  
Author(s):  
Carolina Aravena ◽  
Tahir Kansu Bozkurt ◽  
Fei Yu ◽  
Anthony J. Aldave
Keyword(s):  
Stem Cell ◽  
Limbal Stem Cell Deficiency ◽  
Type I ◽  
Long Term Outcomes ◽  
Limbal Stem Cell ◽  
Boston Type I Keratoprosthesis

scholarly journals Long-Term Outcomes of Sacrococcygeal Germ Cell Tumors in Infancy and Childhood

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Rangsan Niramis ◽  
Maitree Anuntkosol ◽  
Veera Buranakitjaroen ◽  
Achariya Tongsin ◽  
Varaporn Mahatharadol ◽  
...  
Keyword(s):  
Germ Cell ◽  
Distant Metastasis ◽  
Malignant Tumors ◽  
Tumor Resection ◽  
Germ Cell Tumors ◽  
Type I ◽  
Patient Death ◽  
Long Term Outcomes ◽  
Infancy And Childhood

Purpose. The aim of this study was to evaluate long-term outcomes of sacrococcygeal germ cell tumors (SC-GCTs) over a 15-year period.Materials and Methods. A retrospective review was conducted of all pediatric patients treated for SC-GCTs at our hospital from 1998 to 2012.Results. Fifty-seven patients were treated for SC-GCTs with the most common in Altman’s classification type I. Age at surgery ranged from one day to 5.6 years. Tumor resection and coccygectomy were primarily performed in about 84% of the cases. Pathology revealed mature, immature, malignant sacrococcygeal teratomas (SCTs), and endodermal sinus tumors (ESTs) in 41 (72%), 4 (77%), 6 (10.5%), and 6 (10.5%), respectively. Recurrence of discase occurred in 3 of 41 patients with mature teratomas (7.3%); 2 recurrences with mature teratomas and one recurrence with EST. Five of 6 malignant SCTs and 3 of 6 ESTs responded well to the treatment. Alpha-fetoprotein (AFP) level was elevated in both malignant teratomas and ESTs. No immediate patient death was noted in any of the 57 cases, but 4 patients with malignant tumors and distant metastasis succumbed at home within 2 years of the initial treatment.Conclusion. Benign SCTs have a significant recurrence rate of approximately 7%. Close follow-up with serial AFP level monitoring should be done for 5 years after initial tumor resection and coccygectomy. The survival rate for malignant SC-GCTs with distant metastasis was unfavorable in the present study.

Gastric carcinoids: Does type of surgery or tumor affect survival?

2018 ◽  
Vol 36 (4_suppl) ◽  
pp. 139-139
Author(s):  
Angelena Crown ◽  
Zaheer S. Kanji ◽  
Alexandra G Lopez-Aguiar ◽  
Mary Dillhoff ◽  
George A. Poultsides ◽  
...  
Keyword(s):  
Clinicopathological Parameters ◽  
Gastric Carcinoid ◽  
Type I ◽  
Tumor Type ◽  
Type Ii ◽  
Long Term Outcomes ◽  
Type Iii ◽  
Gastric Carcinoids ◽  
Type Iv

139 Background: Gastric carcinoids are rare neuroendocrine tumors of the GI tract. They are typically managed according to their etiology. However, there is little known about the impact of surgical strategy on the long-term outcomes of these patients. Methods: All patients who underwent resection of gastric carcinoids at 8 institutions from 2000-2016 were analyzed retrospectively. Tumors were stratified according to subtype (I, II, III, IV) and resection type (local resection LR or formal gastrectomy FG). Clinicopathological parameters, recurrence-free (RFS), and overall survival (OS) were compared between groups. Results: Of 79 patients identified with gastric carcinoids, 34 had type I lesions associated with atrophic gastritis, 4 had type II lesions associated with a gastrinoma, 37 had type III sporadic lesions, and 4 had type IV poorly-differentiated lesions. The mean age of presentation was 56 years in predominantly Caucasian (77%) and female (63%) patients. Mean tumor size was 2.4 cm and multifocal tumors were found in 24 (30%) of patients with the majority occurring in those with type I tumors. Lymph node positive tumors were seen in 15 (19%) patients and 7 (8%) had M1 disease; both most often in type IV followed by type III tumors. R0 resection was achieved in 56 (71%) patients while 15 (19%) had R1 resections and 6 (8%) had R2 resections. Patients with type I and III tumors were equally likely to have a LR (50% and 43% respectively) compared to FG while those with type II and IV all had FG with one exception. Type IV tumors had the poorest RFS and OS while Type II tumors had the most favorable RFS and OS (p < 0.04 and p < 0.0004, respectively). While there was no difference in RFS in those patients undergoing FG versus LR, OS was worse in the FG group (p < 0.017). This trend persisted when type II and type IV groups were excluded (p < 0.045). Conclusions: Gastric carcinoid treatment should be tailored to tumor type, as biologic behavior rather than resection technique is the more important factor contributing to long-term outcomes.

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