Applications of convolutional neural networks in chest X-ray analyses for the detection of COVID-19
Published on: 20th January, 2022
OCLC Number/Unique Identifier: 9391752257
Throughout global efforts to defend against the spread of COVID-19 from late 2019 up until now, one of the most crucial factors that has helped combat the pandemic is the development of various screening methods to detect the presence of COVID-19 as conveniently and accurately as possible. One of such methods is the utilization of chest X-Rays (CXRs) to detect anomalies that are concurrent with a patient infected with COVID-19. While yielding results much faster than the traditional RT-PCR test, CXRs tend to be less accurate. Realizing this issue, in our research, we investigated the applications of computer vision in order to better detect COVID-19 from CXRs. Coupled with an extensive image database of CXRs of healthy patients, patients with non-COVID-19 induced pneumonia, and patients positive with COVID-19, convolutional neural networks (CNNs) prove to possess the ability to easily and accurately identify whether or not a patient is infected with COVID-19 in a matter of seconds. Borrowing and adjusting the architectures of three well-tested CNNs: VGG-16, ResNet50, and MobileNetV2, we performed transfer learning and trained three of our own models, then compared and contrasted their differing precisions, accuracies, and efficiencies in correctly labeling patients with and without COVID-19. In the end, all of our models were able to accurately categorize at least 94% of the CXRs, with some performing better than the others; these differences in performance were largely due to the contrasting architectures each of our models borrowed from the three respective CNNs.
Early Outcomes of a Next-Generation Balloon-Expandable Transcatheter Heart Valve - The Myval System: A Single-Center Experience From Serbia
Published on: 26th June, 2023
Transcatheter aortic valve implantation (TAVI) is one of the most effective treatments for severe aortic valve stenosis (AVS). Different genres and generations of transcatheter heart valves (THVs) are accessible, offering operators an opportunity to choose a patient-tailored device. In this single-center study, we present the outcomes of Serbian patients treated with next-generation Myval THV for severe symptomatic AVS. Myval THV was implanted in all consecutive patients who underwent TAVI at the Dedinje Cardiovascular Institute of Belgrade, Serbia between October 2020 and September 2021. The primary endpoint was device success on day 30. Secondary endpoints included 30-day all-cause mortality, cardiovascular death, stroke, moderate/severe paravalvular leak (PVL), and new permanent pacemaker implantation (PPI). TAVI was performed as per the European Society of Cardiology guidelines. The study comprised thirteen patients, aged 72±13 years with mean EuroSCORE (7.17%) and Society of Thoracic Surgeons (2.72%,) scores who underwent TAVI successfully with 92.3% using the percutaneous approach. Myval THV intermediate and extra-large sizes were implanted in 46% and 15% of patients, respectively. This acute procedure success rate was 100%. The primary composite endpoint of early device success was achieved in all patients. None of the patients had clinically significant aortic regurgitation or moderate/severe PVL. No patient experienced stroke, contrast-induced acute kidney injury, device-related vascular complications, or a new PPI. The all-cause mortality rate at 30 days was 0%. Myval THV system demonstrated a favorable safety/efficacy profile within 30 days post-procedure at a single center in Serbia. This is the first report of my experience with Myval THV from Serbia.
Fibromuscular dysplasia and aortic dissection
Published on: 30th March, 2022
Fibromuscular dysplasia is a rare, non-atherosclerotic, non-inflammatory vascular disease that typically affects women between the ages of 20 and 60 years.Although any artery can be affected fibromuscular dysplasia most commonly affects the renal and carotid arteries. Fibromuscular dysplasia of the renal arteries usually presents with hypertension, while carotid or vertebral artery disease causes transient ischemic attacks, strokes, or dissection. Aortic dissection is rare. We present the clinical case of a patient with fibromuscular dysplasia with type B aortic dissection.
Mouth-to-mouth ventilation through cardiopulmonary resuscitation, is there any other way?
Published on: 29th November, 2021
OCLC Number/Unique Identifier: 9359436628
Objective: to provide and explore possibility of new idea that perform mouth-to-mouth ventilation through cardiopulmonary resuscitation. Methods: stage one was establishing the ventilation technique using cola bottles, stage two was measuring the tidal volume when different sized cola bottles were used. Result: the smallest sized cola bottle (500 ml) could also make obvious thorax rise in manikin CPR model. The tidal volume was 174.5 ± 9.1 ml, 220 ± 7.6 ml and 447 ± 15.9 ml respectively for 500 ml, 600 ml and 1.25 L cola bottles when using single hand performance. There were statistical differences (0.001) in tidal volume of different sized cola bottle by using one hand performance and two hands. Conclusion: Larger sized cola bottles (600 ml, 1.25 L) could be used as substitute ventilation technique for mouth-to-mouth ventilation in special circumnutates.
Isolated multiple pericardial hydatid cysts in an asymptomatic patient: Role of the CMR
Published on: 6th January, 2023
Hydatid cysts primarily affect the liver and secondary involvement may be seen in almost any anatomic location. We describe the unusual pericardial location of the Echinococcus cysts in an asymptomatic patient with suggestive cardiac magnetic resonance imaging.
A retrospective cohort study to evaluate the relationship of airway hyperresponsiveness to type 2 biomarkers in persistent asthma
Published on: 17th February, 2021
OCLC Number/Unique Identifier: 8927344068
Airway hyperresponsiveness (AHR) is a hallmark of persistent asthma measured using direct or indirect airway bronchial challenge testing. The purpose of this study is to investigate the putative relationships between type 2 inflammatory biomarkers, airway geometry (FEV1 and FEF25-75) and specific IgE (RAST or skin prick) to AHR. We performed a retrospective analysis of our database (n = 131) of patients with asthma. Of these subjects, 75 had a histamine challenge and 56 had a mannitol challenge. Fractional exhaled nitric oxide (FeNO) and specific immunoglobulin E (IgE) but not blood eosinophils were significantly higher in patients with AHR to either histamine or mannitol. FEV1 % and FEF25 - 75 % were significantly lower in patients with AHR. Elevated Type 2 biomarkers including FeNO and specific IgE but not blood eosinophils were associated with AHR.
Highlights: FeNO and specific IgE but not blood eosinophils are raised in patients with airway hyperresponsiveness.
Nutritional interventions for the prevention and treatment of neurological disorders such as anxiety, bipolar disorder, depression, epilepsy, multiple sclerosis, and schizophrenia
Published on: 11th November, 2022
Neurological disorders are a significant cause of mortality and disability across the world. The current aging population and population expansion have seen an increase in the prevalence of neurological and psychiatric disorders such as anxiety, bipolar disorder, depression, epilepsy, multiple sclerosis and schizophrenia. These pose a significant societal burden, especially in low - and middle-income countries. Many neurological disorders have complex mechanisms and lack definitive cures; thus, improving our understanding of them is essential. The pathophysiology of neurological disorders often includes inflammation, mitochondrial dysfunction and oxidative stress. Oxidative stress processes, especially the generation of reactive oxygen species, are key mechanisms in the development of neurological disorders. Oxidative stress refers to an imbalance between the production of reactive oxygen species and antioxidants that can counteract them. Through their impacts on the pathophysiology of neurological disorders, nutrients with anti-inflammatory, neuroprotective and antioxidative properties have been suggested to prevent or mitigate these disorders. Certain vitamins, minerals, polyphenols and flavonoids may have therapeutic effects as adjuvant treatments for neurological disorders. Diet quality is also a risk factor for some neurological and psychiatric disorders and addressing nutritional deficiencies may alleviate symptoms. Therefore, optimizing nutritional intake may represent a potential treatment or prevention strategy. This review summarizes a selection of promising nutrients for the prevention and amelioration of neurological disorders to provide a summary for scientists, clinicians and patients, which may improve understanding of the potential benefits of nutrients in the treatment of neurological disorders.
Aspirin for Primary Prevention of Cardiovascular Disease: What We Now Know
Published on: 9th January, 2024
Cardiovascular disease (CVD), including coronary artery disease and stroke, is the leading cause of death worldwide. Advances in primary and secondary prevention of CVD have improved patient prognoses and outcomes, however, it is imperative that the clinician and patient engage in early risk factor screening and preventive management of modifiable risk factors for CVD. In addition to blood lipid and blood pressure lowering medications, aspirin has been a long-standing therapy targeted to the prevention of CVD based on its antiplatelet and anti-inflammatory activity. However, recent articles and reports on updates to clinical guidelines for the primary prevention of CVD have resulted in confusion about aspirin recommendations. This review aims to assess the latest guidance on aspirin in CVD prevention and how to identify appropriately at-risk patients who may benefit from low-dose aspirin therapy as part of their CVD preventive healthcare choices. Additionally, this review will provide practical application guidance about clinician-patient conversations to clearly explain the benefits and risks of aspirin use and ensure a patient-centric decision to initiate aspirin therapy.
Treatment protocol with alternative iron drugs in patients with an allergic reaction during iron replacement therapy
Published on: 1st February, 2023
In our study, we aimed to show that alternative iron salts containing different additives are safe to use in patients who have type 1 hypersensitivity reactions to iron drugs and need iron replacement therapy.Materials and methods: Between January 2022 and June 2022, patients who had previously developed type 1 hypersensitivity reactions with iron preparations and needed iron replacement were included in the study. The study was designed retrospectively. Skin tests were first performed on patients to demonstrate a type 1 hypersensitivity reaction. If skin tests were negative and there was no history of life-threatening anaphylaxis, oral provocation tests were continued. If the absence of variability in symptoms and perimeter values, the drug allergy test was considered negative. Results: Twenty-two patients were included in the study. Twenty-one of the patients were female and one was male. Iron deficiency anemia was found in nine patients, and low iron stores in thirteen patients without anemia were found. Type 1 hypersensitivity reaction developed with Iron 3 Carboxymaltose in 7 patients, Iron 2 Sulfate in 5 patients, Iron 2 Glycine in 4 patients, Iron 3 Hydroxy Polymaltose in 4 patients, Iron 2 Fumarate in 1 patient and Iron 3 Hydroxide Sucrose in 1 patient. Allergy tests with all alternative iron drugs containing additional additives were negative.Conclusion: If patients with allergic reactions cannot be referred to allergy clinics, we think that oral iron salts with different additives can be used after the first dose is given in the hospital under general anaphylaxis precautions. We show that oral iron salts containing different additives can be safely used.
Percutaneous treatment of severe retroperitoneal hematoma after percutaneous coronary intervention
Published on: 25th September, 2021
OCLC Number/Unique Identifier: 9272370670
We describe a patient who developed severe retroperitoneal and intraperitoneal bleeding complicating femoral arterial catheterization for Percutaneous coronary intervention. Balloon tamponade of the actively bleeding femoral artery was effective in sealing off the leakage.This management strategy for this problem emphasizing an anatomical based interventional approach if the patient does not stabilize with volume resuscitation.
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Department of Neurosurgery, Queen Elizabeth Hospital, Hong Kong
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