Short-term warming does not affect intrinsic thermotolerance but induces strong sustaining photoprotection in tropical evergreen citrus genotypes.

Consequences of warming and postwarming events on photosynthetic thermotolerance (PT ) and photoprotective responses in tropical evergreen species remain elusive. We chose Citrus to answer some of the emerging questions related to tropical evergreen species' PT behaviour including (i) how wide is the genotypic variation in PT ? (ii) how does PT respond to short-term warming and (iii) how do photosynthesis and photoprotective functions respond over short-term warming and postwarming events? A study on 21 genotypes revealed significant genotypic differences in PT , though these were not large. We selected five genotypes with divergent PT and simulated warming events: Tmax 26/20°C (day-time highest maximum/night-time lowest maximum) (Week 1) < Tmax 33/30°C (Week 2) < Tmax 36/32°C (Week 3) followed by Tmax 26/16°C (Week 4, recovery). The PT of all genotypes remained unaltered despite strong leaf megathermy (leaf temperature > air temperature) during warming events. Though moderate warming showed genotype-specific stimulation in photosynthesis, higher warming unequivocally led to severe loss in net photosynthesis and induced higher nonphotochemical quenching. Even after a week of postwarming, photoprotective mechanisms strongly persisted. Our study points towards a conservative PT in evergreen citrus genotypes and their need for sustaining higher photoprotection during warming as well as postwarming recovery conditions.

Publication trends in telemedicine research originating from Canada.

Telemedicine modalities for patient care have seen significant global uptake during the COVID-19 pandemic. This study aimed to bibliometrically evaluate the evolution and current landscape of telemedicine literature in Canada. The Scopus database was searched to identify telemedicine publications for which the first or last author had a Canadian institutional affiliation. Study selection and data abstraction were conducted by two pairs of independent reviewers. Between 1976 and January 2021, 810 of 3,620 retrieved citations were telemedicine publications originating from Canada, including 29 randomized controlled trials and 6 systematic reviews. The annual publication output increased substantially from 1/year in 1976 to 80/year in 2020. Based on author keyword analysis, the most frequently investigated disciplines or disease entities were primary care, COVID-19, telepsychiatry, heart failure, and mental health. The insights this study provides will aid scientists, policy makers, and other stakeholders in identifying opportunities for future investigation and clinical application.

Treat-and-extend regimens of anti-vascular endothelial growth factor therapy for retinal vein occlusions: a systematic review and meta-analysis.

OBJECTIVE: To investigate treat-and-extend (T&E) regimens of anti-vascular endothelial growth factor (anti-VEGF) therapy for the treatment of macular oedema secondary to retinal vein occlusions (RVOs). METHODS: Ovid MEDLINE, Ovid EMBASE and CENTRAL were searched on 25 February 2021. Randomized controlled trials, cohort studies, case-control studies and case series were included. The primary outcome was the change in Early Treatment Diabetic Retinopathy Score (ETDRS) letters from baseline. Conversions from Snellen to ETDRS letters were performed utilizing a published protocol. Secondary outcomes included improvement in retinal thickness from baseline, number of anti-VEGF injections and frequency of adverse events. Outcomes were examined at 12 and 24 months. Certainty of evidence was assessed utilizing GRADE (Grading of Recommendations Assessments, Development and Evaluations) guidelines. RESULTS: Seven hundred eighty-six eyes from 16 studies were included. Meta-analysis demonstrated a mean improvement of 15.7 (95% CI: 13.3-18.0) ETDRS letters at 12 months. Central retinal thickness improved 269.7 µm (95% CI: 233.64-305.90) at 12 months. Injections were performed 8.1 (95% CI: 7.4-8.7) and 13.1 (95% CI: 9.4-16.8) times at 12 and 24 months respectively. Adverse events were infrequent across all studies. Grading of Recommendations Assessments, Development and Evaluations (GRADE) certainty of evidence was very low across all outcomes. CONCLUSIONS: The results support the viability of T&E regimens for the treatment of macular oedema secondary to RVOs.

Treat-and-extend versus alternate dosing strategies with anti-vascular endothelial growth factor agents to treat center involving diabetic macular edema: A systematic review and meta-analysis of 2,346 eyes.

Anti-vascular endothelial growth factor (Anti-VEGF) agents are the standard of care for diabetic macular edema (CI-DME) with vision loss. They are commonly administered using several treatment protocols, including fixed, pro re nata (PRN) and treat-and-extend (T&E) regimens. Because of the lack of evidence defining an ideal treatment paradigm, we systematically compared T&E with fixed or PRN regimens. Visual acuity improvement was similar when comparing T&E to fixed or PRN dosing at 12 and 24 months. Regarding anatomic outcomes, no significant difference was found between T&E and fixed regimens for central retinal thickness or central subfoveal thickness at 12 and 24 months. Similarly, no significant difference was found for central retinal thickness at 12 months for T&E versus PRN regimen. Regarding total number of injections, no significant difference existed between T&E versus fixed regimens at 12 months. PRN regimens delivered fewer injections compared to T&E regimens at 12 months. The results of this analysis support that visual acuity and anatomic outcomes at 12 and 24 months are similar between T&E with either fixed or PRN regimens. More head-to-head trials comparing T&E versus fixed and PRN dosing are needed to provide visual and functional outcome data beyond year 2. PROSPERO Registration: CRD42021249362.

Outcomes of Percutaneous Coronary Intervention Versus Optimal Medical Treatment for Chronic Total Occlusion: A Comprehensive Meta-analysis.

The presence of concurrent chronic total occlusion (CTO) is a strong predictor for both short-term and long-term mortality. Successful percutaneous coronary intervention (PCI) of CTO has been associated with clinical benefit. We sought to perform a meta-analysis comparing CTO-PCI versus optimal medical therapy. PubMed, ClinicalTrials.gov, Google scholar and the Cochrane Central Register of Controlled Trials were searched for studies published from 2006 to 2019. A total of 16 studies, with 11,314 patients were included. We analyzed data on mortality, cardiac deaths, myocardial re-infarction, major adverse cardiac events, stroke, and repeat CTO-PCI using random-effects models. The odds ratios (OR) with 95% confidence interval (CI) were computed and P < 0.05 was considered as a level of significance. Compared with medical therapy alone, CTO-PCI was associated with lower mortality (OR: 0.45, CI: 0.32-0.63, P < 0.00001) and cardiac deaths (OR: 0.58, CI: 0.38-0.89, P = 0.01). These results were primarily driven by observational studies with no difference observed in randomized controlled trials. There was no significant difference in the incidence of major adverse cardiac events (OR: 0.71, CI: 0.48-1.05, P = 0.54), myocardial re-infarction (OR: 0.71, CI: 0.48-1.05, P = 0.54), stroke (OR: 0.61, CI: 0.32-1.17, P = 0.14, and repeat PCI (OR: 1.28, CI: 0.91-1.78, P = 0.16). This meta-analysis shows lower long-term mortality and cardiac deaths in CTO-PCI group as compared to OMT driven by observational studies with no difference observed in randomized controlled trials. Further randomized trials are needed to confirm these findings and evaluate long term results.

Risk Stratification for Transcatheter Aortic Valve Replacement.

Risk assessment models developed from administrative and clinical databases are used for clinical decision making. Since these models are derived from a database, they have an inherent limitation of being as good as the data they are derived from. Many of these models under or overestimate certain clinical outcomes particularly mortality in certain group of patients. Undeniably, there is significant variability in all these models on account of patient population studied, the statistical analysis used to develop the model and the period during which these models were developed. This review aims to shed light on development and application of risk assessment models for cardiac surgery with special emphasis on risk stratification in severe aortic stenosis to select patients for transcatheter aortic valve replacement.

Renal Cell Carcinoma Metastasis to an Uncommon Site: The Orbital Bone.

Renal cell carcinoma (RCC) represents 90% of all renal cancers. Patients may present with weight loss, hematuria, abdominal mass, abdominal pain, fever, and night sweats. The classic symptoms of flank pain, hematuria, and a palpable flank mass occur in less than 10% of patients and suggest advanced disease. However, most patients are typically asymptomatic and diagnosed incidentally. RCC metastasizes most commonly to the lung parenchyma, bone, liver, and brain and less commonly to the thyroid, pancreas, muscle, skin, and soft tissue. It is very rare for RCC to metastasize to the orbital bone. We present a case of a patient who presented with left cheek pain, tingling, and numbness and was ultimately found to have orbital metastasis of RCC.

Aeromonas salmonicida Bacteremia Associated with Chronic Well Water Consumption in a Patient with Diabetes.

Aeromonas salmonicida is associated with superficial skin infections in fish. Its virulence factors allow colonization of water including surface water such as salt water, beaches, and fresh water wells. Moreover, it is possible for immunocompromised patients to develop invasive disease after chronic exposure to Aeromonas spp. through contaminated water. While there are reports of Aeromonas spp. bacteremia following water ingestion, there have been no reports of A. salmonicida bacteremia from water consumption. We report the first case of A. salmonicida bacteremia in a patient with diabetes due to chronic consumption of well water.