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1071 covid-19 Wiley Open Research Preprints

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covid-19 pandemic coronary artery disease social distancing drug interactions vascular pharmacology drug development forecasting drug metabolism clinical trials nitric oxide ecmo metabolism sars covid-19 zoonosis/zoonotics gpcr translational pharmacology perfusion emerging diseases sars-cov-2 cardiac pharmacology transmission pharmacokinetics respiratory pharmacology bedside cannulation + show more keywords
cytokines toxicology reproductive number corona virus repurposing cardiac surgery virology infectious diseases complement receptors quarantine autoimmunity virus toxicity acei haematology in vivo covid-19 disease
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Please note: These are preprints and have not been peer reviewed. Data may be preliminary.
Bedside veno-venous ECMO cannulation
Domenico Calcaterra
Beth Heather

Domenico Calcaterra

and 4 more

April 21, 2020
Patient selection and cannulation arguably represent the key steps for the successful implementation of Extracorporeal Membrane Oxygenation (ECMO) support. Cannulation is traditionally performed in the operating room or the catheterization laboratory for a number of reasons, including physician preference and access to real-time imaging, with the goal of minimizing complications and ensuring appropriate cannula positioning. Nonetheless, the patients’ critical and unstable conditions often require emergent initiation of ECMO and preclude the safe transport of the patient to a procedural suite. Therefore, with the objective of avoiding delay with initiation of therapy and reducing the hazard of transport, we implemented a protocol for bedside ECMO cannulation. In the current pandemic, this strategy may have additional benefits for the care of patients with refractory acute respiratory distress syndrome (ARDS) due to COVID-19 decreasing risk of healthcare worker or other patients exposure to the novel SARS-CoV-2 virus occurring during patient transport, preparation, or during disinfection of the procedural suite and the transportation pathway after ECMO cannulation.
Cats under the shadow of SARS-CoV-2 pandemic
Xiangdong  Li

Xiangdong Li

April 20, 2020
I have some comments on TBED recently published paper titled “Serological survey of SARS-CoV-2 for experimental, domestic, companion and wild animals excludes intermediate hosts of 35 different species of animals” by Deng JH, et al.
Clinical features and outcomes of COVID-19 patients with benign prostatic hyperplasia...
Ramazan Topaktas
Emre Tokuç

Ramazan Topaktas

and 5 more

April 20, 2020
Aim: A worldwide pandemic of coronavirus disease 2019 (COVID-19) which emerged in China in December 2019 affects the world very seriously. We aimed to evaluate the benign prostatic hyperplasia (BPH) patients who were admitted and treated to our hospital due to COVID-19. Methods: Between March 18, 2020 and April 5, 2020 , 18 patients admitted with COVID-19 who has BPH and are using medication for this were included in the study and analyzed retrospectively. Diagnosis was confirmed by COVID-19 nucleic acid test by sampling sputum or nasopharyngeal swab. Standard COVID-19 treatment protocol determined by our Ministry of Health was applied to all patients according to their risk groups. Epidemiological, clinical, radiological features, additional diseases, laboratory tests, complications and outcome data of all patients were recorded. Results: Mean age of patients was 59.6 (range: 56-73). As the mode of transmission, 10 (55.5%) of patients were infected in hospital, 5 (27.7%) patients had a relative with COVID-19 and 3 (16,6%) was unknown. During follow-up, 2 (11.1%) patients were transferred to intensive care unit (ICU). One of these patients dramatically progressed and died. Patients who survived and were not transferred to ICU had lesser comorbidities and were relatively young. Mean duration of hospitalization was 14.2 days (range 12-19). Conclusion: We think that COVID-19 patients with BPH had a low mortality rate and did not have a poor prognosis in this patient group. It is crucial to take comprehensive preventive measures to control COVID-19 transmission via hospital route.
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection after allogene...
Takashi Onaka
Fumie Iwai

Takashi Onaka

and 3 more

April 20, 2020
This is the first report of a case of COVID-19 after allogeneic stem cell transplantation. Our case suggests that COVID-19 may exist without characteristic CT images, especially in immunocompromised hosts, such as patients after transplantation.
The great pandemic of 2020: A defining moment for Heart Rhythm Societies and their me...
Robert Lemery

Robert Lemery

April 20, 2020
The pandemic caused by SARS-CoV-2 has affected communities throughout the world. The global nature of health care disparities is exacerbated by COVID-19. Patients in Low-and Middle-Income Countries have limited health care resources and marginal support for the evaluation and treatment of cardiac rhythm disorders. Heart Rhythm Societies and their members need to advocate for increased subsidies and assistance for these patients.
Modeling COVID-19: Forecasting and analyzing the dynamics of the outbreak in Hubei an...
ibrahim Aslan
Mahir Demir

ibrahim Aslan

and 3 more

April 20, 2020
As the pandemic of Coronavirus Disease 2019 (COVID-19) rages throughout the world, accurate modeling of the dynamics thereof is essential. However, since the availability and quality of data varies dramatically from region to region, accurate modeling directly from a global perspective is difficult, if not altogether impossible. Nevertheless, via local data collected by certain regions, it is possible to develop accurate local prediction tools, which may be coupled to develop global models. In this study, we analyze the dynamics of local outbreaks of COVID-19 via a coupled system of ordinary differential equations (ODEs). Utilizing the large amount of data available from the ebbing outbreak in Hubei, China as a testbed, we estimate the basic reproductive number, R0 of COVID-19 and predict the total cases, total deaths, and other features of the Hubei outbreak with a high level of accuracy. Through numerical experiments, we observe the effects of quarantine, social distancing, and COVID-19 testing on the dynamics of the outbreak. Using knowledge gleaned from the Hubei outbreak, we apply our model to analyze the dynamics of outbreak in Turkey. We provide forecasts for the peak of the outbreak and the total number of cases/deaths in Turkey, for varying levels of social distancing, quarantine, and COVID-19 testing.
COVID-19 and cardiac surgeon- Are we on the back-foot?
Sudhansoo Khanna

Sudhansoo Khanna

April 20, 2020
The coronavirus disease 2019 (COVID-19) is an infectious disease which has rapidly evolved into a pandemic. Though it has affected all disciplines of medical sciences but it has some serious implications pertaining to cardiovascular sciences which have presented unique challenges in front of cardiac surgeons in particular. To flatten the curve of this pandemic, routine cardiac surgeries are being deferred indefinitely resulting in the pool of sick cardiac patients rising day by day. A different perspective is presented on this global catastrophe from the viewpoint of a cardiac surgeon.
SARS-CoV-2 viral spike G614 mutation exhibits higher case fatality rate
Manuel Becerra-Flores
Timothy Cardozo

Manuel Becerra-Flores

and 1 more

April 17, 2020
Aim: The COVID pandemic is caused by infection with the SARS-CoV-2 virus. The major mutation detected to date in the SARS-CoV-2 viral envelope spike protein, which is responsible for virus attachment to the host and is also the main target for host antibodies, is a mutation of an aspartate (D) at position 614 found frequently in Chinese strains to a glycine (G). We sought to infer health impact of this mutation. Result: Increased case fatality rate correlated strongly with the proportion of viruses bearing G614 on a country by country basis. The amino acid at position 614 occurs at an internal protein interface of the viral spike, and the presence of G at this position was calculated to destabilize a specific conformation of the viral spike, within which the key host receptor binding site is more accessible. Conclusion: These results imply that G614 is a more pathogenic strain of SARS-CoV-2, which may influence vaccine design. The prevalence of this form of the virus should also be included in epidemiologic models predicting the COVID-19 health burden and fatality over time in specific regions. Physicians should be aware of this characteristic of the virus to anticipate the clinical course of infection. What is known about this topic? Nothing is known about the health significance of the D614G SARS-CoV-2 variant. What does this article add? A molecular clue to viral molecular pathogenesis of COVID-19 disease.
Challenges of drug development during the COVID-19 pandemic: key considerations for c...
Jun Shi
Yubo Xiao

Jun Shi

and 6 more

April 16, 2020
There is an urgent need for targeted and effective COVID-19 treatment. A number of medications, including hydroxychloroquine, remdesivir, lopinavir-ritonavir, fapiravir, and tocilizumab, have been identified as potential treatments for COVID-19. Bringing these repurposed medications to the public for COVID-19 will require robust and high-quality clinical trials. This article reviews translational science principles and strategies for conducting clinical trials in a pandemic and evaluates recent trials for each drug candidate. We hope that this knowledge will help focus efforts during this crisis and lead to the expedited development and approval of COVID-19 therapy.
ACE inhibitors and COVID-19: we don’t know yet
Taqua  Khashkhusha
Jeffrey Chan

Taqua Khashkhusha

and 2 more

April 16, 2020
The SARS-CoV-2, the causative agent of COVID-19, has been established to gain access to the human cell via the ACE2 receptor similar to its familial coronavirus SARS-CoV which led to the outbreak in 2003. A concern with the newer 2019 coronavirus is its 10-20-fold higher affinity to the ACE2 receptor that of SARS-CoV, aiding its effective human-to-human transmission which has led to this pandemic. ACE2 receptor expression is thought to be upregulated in use with ACE inhibitors. As ACE inhibitors are known to be a used extensively in the treatment of hypertension it was a concern regarding the risk of using these medications alongside a SARS-COV-2 infection. ACE inhibitors are also used in the treatment regime of other common conditions including diabetes and Cardiovascular disease (CVD). It is worth noting that ACE2 expression has found to be upregulated by the use of thiazolidinediones and ibuprofen too. Consequently, the increased expression of ACE2 would facilitate infection with COVID-19. Therefore, it would hypothesise that diabetes and hypertension treatment with ACE2-stimulating drugs would increase the risk of developing severe and fatal COVID-19.
Molecular Targets for the Testing of COVID-19
Suh Kuan Yong
Ping-Chia Su

Suh Kuan Yong

and 2 more

April 16, 2020
The pandemic outbreaks of coronavirus disease 2019 (COVID-19) was first discovered in Wuhan, Hubei, China in December 2019. The COVID-19 was caused by the novel coronavirus, namely severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It took 30 days to spread to all provinces of China [1]. Recently, the confirmed cases of COVID-19 have been reported from about 200 countries or regions on March 30, 2020, and killed almost 30 thousand people [2]. Efficient identification of the infection by SARS-CoV-2 has been one of the most important tasks to facilitate all the following counter measurements in dealing with infectious disease. In Taiwan, a COVID-19 Open Science Platform adhering to the spirit of open science: sharing sources, data, and methods to promote progress in academic research while corroborating findings from various disciplines has established in mid-February 2020, for collaborative research in support of the development of detection methods, therapeutics, and a vaccine for COVID-19. Research priorities include infection control, epidemiology, clinical characterization and management, detection methods (including viral RNA detection, viral antigen detection, and serum antibody detection), therapeutics (neutralizing antibody and small molecule drugs), vaccines, and SARS-CoV-2 pathogenesis. In addition, research on social ethics and the law are included to take full account of the impact of the COVID-19 virus.
Inhaled Nitric Oxide and COVID-19
Lou Ignarro

Lou Ignarro

April 15, 2020
Nitric oxide (NO) is a unique signaling molecule in the mammalian species. NO is produced by a variety of cell types to elicit distinct physiological actions. In the vascular system, NO is produced by the endothelium, a single layer of cells forming the inner lining of all blood vessels. Endothelium-derived NO has several different functions, one of which is vascular smooth muscle relaxation, resulting in vasodilation and a consequent decrease in blood pressure and increase in local blood flow. In the erectile tissue, NO is released as a neurotransmitter from the nerves innervating the corpus cavernosum during sexual stimulation, and causes profound smooth muscle relaxation and increased blood flow to the erectile tissue. This results in engorgement with blood and consequent penile erection.The uniqueness of NO as a signaling molecule derives, at least in part, by the fact that it is a gaseous molecule in its native state. However, despite being a gas, NO, like oxygen (O2), elicits its pharmacological effects as a solute in aqueous solution. Another unique characteristic of NO is its fleeting action because of its highly unstable chemical nature and reactivity. Unlike many other signaling molecules, NO elicits its wise array of physiological effects by distinct mechanisms. For example, vascular and nonvascular smooth muscle relaxation, and inhibition of platelet function are mediated by intracellular cyclic GMP (cyclic 3’, 5’-guanosine monophosphate). NO elicits many cyclic GMP-independent effects as well. For example, nitric oxide is a reactive free radical that can covalently modify protein function. One good example is protein S-nitrosylation, which can result in both regulatory and aberrant effects. By this and a variety of other mechanisms, NO also reacts with other molecules, such as reactive oxygen species, in invading cells such as bacteria, parasites and viruses to kill them or inhibit their replication or spread.The first pharmacological action of nitric oxide, demonstrated several years before it’s production in mammals was actually discovered, was vascular and nonvascular smooth muscle relaxation. One of many examples of the latter is the smooth muscle enveloping the sinusoidal cavities within the corpus cavernosum. Another important example is the airway smooth muscle in the trachea and bronchioles of the lungs. Indeed, inhalation of NO gas causes bronchodilation and increased delivery of air into the lungs. However, perhaps more significant than the bronchodilator effect of inhaled NO is its vasodilator effect. In fact, advantage was taken of the vasodilator action of NO in the lungs by Warren Zapol, MD, from the Massachusetts General Hospital in Boston, who discovered that inhalation of very small amounts of NO gas by newborn babies with life-threatening, persistent pulmonary hypertension (PPHN) results in a dramatic and permanent reversal of pulmonary vasoconstriction. Inhaled NO (INO) literally turned blue babies into pink babies. Without INO, most babies would have died while others would have required highly invasive procedures (extracorporeal membrane oxygenation; ECMO) to oxygenate their lungs, and may not have survived.Regarding its antiviral action, NO has been shown to increase the survival rate of mammalian cells infected with SARS-CoV (Severe Acute Respiratory Syndrome caused by coronavirus). In an in vitrostudy, NO donors (i.e., S-nitroso-N-acetylpenicillamine) greatly increased the survival rate of SARS-CoV-infected eukaryotic cells, suggesting direct antiviral effects of NO (1). In this study, NO significantly inhibited the replication cycle of SARS CoV in a concentration-dependent manner. NO also inhibited viral protein and RNA synthesis. Furthermore, NO generated by inducible nitric oxide synthase inhibited the SARS CoV replication cycle. The coronavirus responsible for SARS-CoV shares most of the genome of COVID- 19 indicating potential effectiveness of inhaled NO therapy in these patients.In 2004, during the SARS-CoV outbreak in China, the administration of inhaled NO reversed pulmonary hypertension, improved severe hypoxia and shortened the length of ventilatory support as compared to matched control patients with SARS-CoV (2). The mechanism of action was thought to be pulmonary vasodilation and consequent improved oxygenation in the blood of the lungs, thereby killing the virus, which does not do well in a high oxygen environment. In addition, however, I would offer the opinion that the NO also interacts directly with the virus to kill it and/or inhibit its replication, as shown in a prior study (1).Although studies have not yet been reported with COVID-19, NO has been shown to have an antiviral effect on several DNA and RNA virus families (3). The NO-mediated S-nitrosylation of viral molecules might be an intriguing general mechanism for the control of the virus life cycle. In this regard, it is conceivable that NO could nitrosylate cysteine-containing enzymes and proteins, including nucleocapsid proteins and glycoproteins, present in the coronavirus.In view of the knowledge gained by treating SARS-CoV patients with INO, it follows that INO might be effective in patients with the current SARS CoV-2 (COVID-19) infection. Indeed, a clinical trial of inhaled nitric oxide in patients with moderate to severe COVID-19 with pneumonia and under assisted ventilatory support recently received IRB (Institutional Review Board) approval at the Massachusetts General Hospital. Warren Zapol is director of this project. This trial has now been expanded to include at least two additional hospitals in the U.S. In the successful treatment of persistent pulmonary hypertension in newborns, the amount of NO inhaled is generally one ppm (part per million). In the clinical trial using COVID-19 patients, the amount of NO will be approximately 100-fold higher, about 100 ppm. This is a safe dose of INO, which could prove to be effective in killing the virus and allowing recovery of the patient. The effective use of INO would also lessen the need for oxygen, ventilators, and beds in the ICU.One thing I urge everyone to practice during this coronavirus pandemic is to breathe or inhale through your NOSE and exhale through your mouth. Swedish investigators at the Karolinska Institute in Stockholm have shown that the cells and tissues in the nasal sinusoids, but not the mouth, constantly and continuously produce nitric oxide, which is a gas, and can be easily detected in the exhaled breath. The physiological significance of this is that nasally-derived NO, when inhaled through the nose, improves oxygen delivery into the lungs by causing bronchodilation. This physiological action of inhaled NO is well-known by competitive athletes, especially runners. Moreover, when inhaling through the nose, your nasal nitric oxide is inhaled into your lungs where it stands a chance of meeting up with the coronavirus particles and killing them or inhibiting their replication. Inhaling through your mouth will NOT accomplish this. By the same token, exhaling through your nose is highly wasteful in that you would be expelling the NO away from the lungs, where it is needed most.“INHALE THROUGH YOUR NOSE, AND EXHALE THROUGH YOUR MOUTH!”
Lung tissue distribution of drugs as a key factor for COVID-19 treatment
Yan WANG
Lei Chen

Yan WANG

and 1 more

April 15, 2020
Lopinavir combined with ritonavir were reported to benefit the patients with SARS by reducing the viral loads. However, in the latest clinical trials, no benefit was observed with lopinavir-ritonavir treatment beyond standard care in patients with COVID-19. We comment here that this disappointed result of clinical trial might result from the low volume of the lung distribution of lopinavir. The major reasons were listed below: 1) The binding affinity of ACE2 with SARS-CoV-2 spike protein is ~10- to 20-fold higher than the binding affinity of ACE2 with SARS-CoV spike protein, indicating that SARS-CoV-2 can enter AT2 cells in lung much easier than SARS-CoV. Therefore, the viral loads of SARS-CoV-2 might be much higher than viral loads of SARS-CoV in the lung tissue. 2) The concentration of lopinavir in the lung tissue was 1.18 μg equiv/ml in rats. The low volume of the lung distribution of lopinavir might not be enough to inhibit the coronavirus replication due to the high viral loads in the lung tissue. 3) In contrast, the concentration of chloroquine in the lung tissue was much higher (30.76 ± 0.85 μg equiv/ml) in rats, which might lead to its clinical and virologic benefits in the treatment of COVID-19 patients. Together, we proposed here that anti-SARS-CoV-2 drug repurposing studies should pay more attentions to the lung tissue distribution of antiviral drugs. The efficacy of antiviral drugs might depend on their lung tissue distributions
COVID-19: Of Schrödinger, cats and masks
George Thomson

George Thomson

April 15, 2020
COVID-19 is a disease which is sweeping the globe, often with devastating consequences. The more we understand, the more it appears that infection has a very wide clinical spectrum from totally asymptomatic to life threatening. Without widespread community testing it is impossible to ascertain true infection rates and develop strategies which reduce or prevent transmission without the need for on-going draconian measures such as complete national lockdown. These measures are mandatory at the time of writing, however widespread adoption of face masks has been shown to help prevent transmission of other respiratory pathogens, and also infections acquired by healthcare staff. Combining mass testing with a combination of social distancing and face mask use might offer a way forward until a mass COVID-19 vaccination programme can be established.
Cardiac surgery in the time of the coronavirus
Daniel  Fudulu
Gianni Angelini

Daniel Fudulu

and 1 more

April 13, 2020
The current Covid-19 pandemic is a significant global health threat. The outbreak has profoundly affected all healthcare professionals, including heart surgeons. To adapt to these exceptional circumstances, cardiac surgeons had to change their practice significantly. We herein discuss the challenges and broad implications of the Covid-19 pandemic from the perspective of the heart surgeons.
A hypothesis for pathobiology and treatment of COVID-19: the centrality of ACE1/ACE2...
Krishna Sriram
Paul Insel

Krishna Sriram

and 1 more

April 13, 2020
Angiotensin converting enzyme-2 (ACE2) is the receptor for the coronavirus SARS-CoV-2, which causes COVID-19. We propose the following hypothesis: Imbalance in the action of ACE1- and ACE2-derived peptides, thereby enhancing Angiotensin-II (ANG II) signaling, a primary driver of COVID-19 pathobiology. ACE1/ACE2 imbalance occurs due to the binding of SARS-CoV-2 to ACE2, reducing ACE2-mediated conversion of ANG II to ANG peptides that counteract pathophysiological effects of ACE1-generated ANGII. This hypothesis suggests several approaches to treat COVID-19 by restoring ACE1/ACE2 balance: 1) ANG II receptor blockers (ARBs); 2) ACE1 inhibitors (ACEIs); 3) Agonists of receptors activated by ACE2-derived peptides [e.g., ANG (1-7), which activates MAS1]; 4) Recombinant human ACE2 or ACE2 peptides as decoys for the virus. Reducing ACE1/ACE2 imbalance is predicted to blunt COVID-19-associated morbidity and mortality, especially in vulnerable patients. Importantly, approved ARBs and ACEIs can be rapidly repurposed to test their efficacy in treating COVID-19.
A rational roadmap for SARS-CoV-2/COVID-19 pharmacotherapeutic research and developme...
Steve Alexander
Jane Armstrong

Steve Alexander

and 9 more

April 13, 2020
In this review, we identify opportunities for drug discovery in the treatment of COVID-19 and in so doing, provide a rational roadmap whereby pharmacology and pharmacologists can mitigate against the global pandemic. We assess the scope for targetting key host and viral targets in the mid-term, by first screening these targets against drugs already licensed; an agenda for drug re-purposing, which should allow rapid translation to clinical trials. A simultaneous, multi-pronged approach using conventional drug discovery methodologies aimed at discovering novel chemical and biological means targetting a short-list of host and viral entities should extend the arsenal of anti-SARS-CoV-2 agents. This longer-term strategy would provide a deeper pool of drug choices for future-proofing against acquired drug resistance. Second, there will be further viral threats, which will inevitably evade existing vaccines. This will require a coherent therapeutic strategy which pharmacology and pharmacologists are best placed to provide.
Evaluation of the role and usefulness of clinical pharmacists at the Fangcang hospita...
Dongyuan  Wang
Yihui Liu

Dongyuan Wang

and 6 more

April 13, 2020
Background: Fangcang hospital (cabin hospitals) played a key role in isolation and control of the infection sources during COVID-19 epidemic. The patients at Fangcang hospitals were complicated, and many had different symptoms of COVID-19, some had comorbidities or mental stress, and many were confused with the drug usages etc. Objective: Due to the limitation and high work pressure of first line medical workers, patients’ various problems couldn’t be explained well. Under this circumstance, online pharmaceutical care was provided by clinical pharmacists. This study was a retrospective study to evaluate the role and usefulness of clinical pharmacists at Jianghan Fangcang Hospital. Besides, this new mode of service was also introduced in detail to provide options for pharmacists in other hospitals. Methods: The pharmaceutical care included medication education via broadcast station, and medication reconciliation, optimization of drug use, monitor of adverse drug events, and psychological comfort via WeChat® one-to-one service. In this study, we analyzed patients’ characteristics and drug usages, concluded almost 200 patients’ problems classified into 6 aspects solved by clinical pharmacists, and also assessed the patients’ satisfaction with our service. Results: The clinical pharmacist help patients solved almost 200 questions, which mainly focused on the drug related problems including drug usage (65.38%), medication reconciliation (55.13%), drug precautions (23.1%), adverse drug reactions (35.9%), and psychological counseling (32.05%). Through 35 days’ services, Most patients were satisfied with clinical pharmacist service(66.7%great, 18.0%good). Besides, most patients thought the service had positive effect on their mental stress(16.7%great, 43.6%good, 26.9%fair). Conclusion: The results of the retrospective study indicated that clinical pharmacist can effectively reduce and prevent drug-related, life-related and COVID-19-related problems for COVID-19 patients. This work may provide possible work patterns for clinical pharmacist in other hospital and give more professional service for Fangcang hospital patients.
Chronic myeloid leukemia and the use of tyrosine kinase inhibitors in the days of COV...
Ahmet Emre Eşkazan

Ahmet Emre Eşkazan

April 13, 2020
Tyrosine kinase inhibitors (TKIs) have revolutionized the management of chronic myeloid leukemia (CML), and currently in patients with CML in chronic phase (CML-CP) the first-line treatment is based on BCR-ABL targeted therapy with TKIs [1]. Although generally well tolerated, all BCR-ABL TKIs can be associated with hematologic and non-hematologic toxicities [2]. Most of the patients with CML-CP continue receiving TKIs, unless there is lack of optimal response and/or serious toxicities.
Acute chloroquine poisoning: A comprehensive experimental toxicology assessment of th...
Dyfrig Hughes

Dyfrig Hughes

April 13, 2020
Background and Purpose: Resurgence in the use of chloroquine as a putative treatment for COVID-19 has seen recent cases of fatal toxicity due to unintentional overdoses. Protocols for the management of poisoning recommend diazepam, although there are uncertainties in its pharmacology and efficacy in this context. The aim was to assess the effects of diazepam in experimental models of chloroquine cardiotoxicity. Experimental Approach: In vitro experiments involved cardiac tissues isolated from rats and incubated with chloroquine, alone, or in combination with diazepam. In vivo models of toxicity involved chloroquine administered intravenously to pentobarbitone-anaesthetised rats and rabbits. Randomised, controlled interventional studies in rats assessed diazepam, clonazepam and Ro5-4864 administered: (i) prior, (ii) during, and (iii) after chloroquine; and the effects of diazepam: (iv) at high dose, (v) in urethane-anaesthetised rats, and (vi) co-administered with adrenaline. Key Results: Chloroquine decreased the developed tension of left atria, prolonged the effective refractory period of atria, ventricular tissue and right papillary muscles, and caused dose-dependent impairment of haemodynamic and electrocardiographic parameters. Cardiac arrhythmias indicated impairment of atrioventricular conduction. Studies (i), (ii) and (v) showed no differences between interventions and control. Diazepam increased heart rate in study (iv) and, as with clonazepam, also prolonged the QTc interval in study (iii). Combined administration of diazepam and adrenaline in study (vi) improved cardiac contractility but caused hypokalaemia. Conclusion and Implications: Neither diazepam, nor other ligands for benzodiazepine binding sites, protect against or attenuate chloroquine cardiotoxicity. However, diazepam may augment the effects of positive inotropes in reducing chloroquine cardiotoxicity.
Voice and the new corona virus
Magdalena Chirila

Magdalena Chirila

April 10, 2020
The new corona virus has become a global health concern.Voice has the potential to provide an easily obtained, non-invasive way to monitor physiological changes throughout the body. For health care providers with experience in the clinical management of patients with COVID-19 and other viral infections, including SARS and MERS, as well as sepsis and ARDS, the application of acoustical voice analysis should serve as a foundation for optimized supportive care to ensure the best possible chance for survival.
Singapore's experience in ensuring continuity of outpatient care during the COVID-19...
Kathleen SY Sek
Andre TH Tan

Kathleen SY Sek

and 5 more

April 09, 2020
The COVID-19 outbreak is a global pandemic with rapid community spread. Patients with multi-morbidities are particularly vulnerable during this time. The number of cases soared in early February 2020, and Singapore declared escalation of the Disease Outbreak Response System Condition (DORSCON) level to Orange. Multiple measures have been taken to combat the spread of this highly contagious infection. Despite our medical manpower being diverted to the wards, our hospital aims to maintain nearly full operations at the clinic, balancing against concern about the spread of the virus and exposing healthcare workers to potential risks. We describe the measures taken in a tertiary hospital in Singapore to mitigate the risk of infection in the outpatient setting while ensuring that continuing clinical care of patients with chronic diseases is not compromised.
Current pharmacological treatments for COVID-19: what’s next?
Cristina Scavone
Simona Brusco

Cristina Scavone

and 9 more

April 09, 2020
Starting from December 2019 the novel SARS-Cov-2 has spread all over the world, being recognized as the causing agent of COVID-19. Since nowadays no specific drug therapies neither vaccines are available for the treatment of COVID-19, drug repositioning may offer a strategy to efficiently control the clinical course of the disease and the spread of the outbreak. In this paper we aim to describe the main pharmacological properties, including data on mechanism of action, safety concerns and drug-drug interactions, of drugs currently administered in patients with COVID-19, focusing on antivirals and drugs with immune-modulatory and/or anti-inflammatory properties. Where available, data from clinical trials involving patients with COVID-19 were reported. A large number of clinical studies have been registered worldwide and several drugs were repurposed to face the new health emergency of COVID-19. For many of these drugs, including lopinavir/ritonavir, remdesivir, favipiravir, chloroquine and tocilizumab, clinical evidence from literature and real life settings support their favorable efficacy and safety profile in improving patients’ clinical conditions. Even though drug repurposing is necessary, it requires caution. Indeed, too many drugs that are currently tested in patients with COVID-19 have peculiar safety profiles. While waiting for the results of clinical studies demonstrating the efficacy of drugs able to reduce symptoms and complications of COVID-19, the best therapeutic path to pursue is the development of an effective vaccine able to prevent this infection.
Cardiovascular surgery in the COVID-19 pandemic
LEVENT MAVIOGLU
Ertekin Unal

LEVENT MAVIOGLU

and 1 more

April 07, 2020
Coronavirus disease 2019 (COVID-19) is a remarkably challenging health issue that provoked all the health-care providers to contemplate some measures about the situation. All the health-care workers frontline (esp. emergency service, pulmonologists, infection disease specialist and anesthesiologist) have produced recommendations on prevention and taking care of COVID-19 patient (1,2). Whereas, at the second line another important issue is the ongoing healthcare for the continual disease situations.There are two main critical issues on cardiovascular surgery in this pandemic. Firstly, to delay the elective surgeries is essential to sustain the health-care service. Elective case triage is trickier for cardiovascular procedures which are relatively progressive conditions. Definitive decision to defer a procedure should be made regarding firstly to the capacity of health-care system, and then availability of surgical/anesthesia staff, intensive care unit beds, need for isolation beds, ventilators, cardiopulmonary bypass machine, extracorporeal membrane oxygenator, supplies such as sutures, grafts, valves and blood and blood product availability. The patient status should be taken into account to defer or to perform the procedure, as well. Therefore, we developed “Level of Priority” (LoP) statement for cardiovascular procedures (3). Elective cases are defined as LoP I that may be postponed as much as possible. LoP II to IV cases should be reconsidered by individual basis by “Heart Team”. The situations that can be managed by percutaneous coronary intervention, endovascular procedures and etc. may be handled by non-operative manners.The second one is the personal protection equipment and infection measures while dealing with a suspected / confirmed COVID-19 patient. It is obvious that a suspected / confirmed COVID-19 patient ought to be assessed with specific measures for any medical or surgical intervention. Personal protection equipment (PPE) is the most crucial measure during the pandemic. It is recognized that many centers are facing PPE shortages and there are recommendations to re-sterile the masks to be effective for reuse.(4) More measures should be taken into consideration for sterile environment such as surgical procedures. Some added measures such as face shield may be recommended for surgical procedures. The surgical team who scrubbed in, must wear extra equipment such as surgical coat and double gloves. It may be recommended to fix the long-sleeve gloves to the surgical coat by adhesive drapes (3). It is obvious that this kind of working environment with all this equipment is challenging, sometimes irritating and disquieting. One other big problem is the fraught feeling of health-care providers to be diseased or to be contagious for their family. Therefore, health-care providers may need enormous support for burnouts during the pandemic.The other measures such as preparation of the operating room (OR), anesthesiologic management, transportation of patients and disinfection of OR were discussed in the referring article (3).In conclusion, it is important to assess the “Level of Priority” for surgical procedures to support the service of health-care facility. More than that, whole surgical team should be protected by adequate PPE and should take the time to get full protected.
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