spontaneous resolution
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2022 ◽  
Mark Walsh ◽  
James Barclay ◽  
Callum Begg ◽  
Jinyi Xuan ◽  
Matthew Kitching

Conglomerate crystallisation is the behaviour responsible for spontaneous resolution and the discovery of molecular chirality by Pasteur. The phenomenon of conglomerate crystallisation of chiral organic molecules has been left largely undocumented and offers synthetic chemists a potential new chiral pool not reliant on biological systems to supply stereochemical information. While other crystallographic behaviours can be interrogated by automated searching, conglomerate crystallisations are not identified within the Cambridge Structural Database (CSD) and are therefore not accessible by conventional means. By conducting a manual search of the CSD, a list of over 1,700 chiral species capable of conglomerate crystallisation was curated by inspection of the synthetic routes described in each publication. The majority of these are produced by synthetic chemists who seldom note and rarely exploit the implications this phenomenon can have on the enantioenrichment of their crystalline materials. We propose that this list represents a limitless chiral pool which will continually grow in size as more conglomerate crystals are synthesised and recorded.

2022 ◽  
Md Ripon Ahammed ◽  
Medha Sharath ◽  
Mehul Sinha ◽  
Cristina Sestacovschi ◽  
Varadha Retnakumar ◽  

Background: Since the emergence of the SARS COV-19 pandemic, multiple extrapulmonary manifestations of the virus have been reported from around the world. Cardiovascular complications including arrhythmias in patients with COVID-19 have been described in multiple studies. Our aim was to review various case reports detailing the new onset of heart block in COVID-19 patients and to summarise the clinical course of these patients. Methods: We systematically reviewed all reports published and indexed in PubMed, Scopus, and Embase between March 2020 to May 2021, analyzing the relation between the demographics of the patients, pre-existing comorbidities, and the progression of heart block in patients infected with COVID-19. Results: We identified and included in this study 30 relevant articles describing 49 COVID-19 patients with heart block. Among them, 69.3% (n=34) of patients suffered from at least one comorbidity. 36.73% (n=18) of the patients showed spontaneous resolution of the heart block. Conversely, 63.26% (n=31) of the patients had persistent heart block, out of which 16.33% (n=8) and 42.86% (n=21) were implanted with a temporary and permanent pacemaker respectively. The reported mortality rate was 22.45% (n=11) during hospitalization. We noted that 45.45% (n=5) of the patients who died had complete heart block. 24.49% (n=12) of the patients in the studies we reviewed were suspected of having myocarditis. However, none were confirmed with MRI or cardiac biopsy. Conclusions: Additional research is necessary to unearth the mechanism of development of heart block in COVID-19 patients as well as its implications on the clinical course and prognosis. Physicians must be aware of the importance of monitoring patients hospitalized for COVID-19 for arrhythmias including heart blocks, especially in the presence of comorbidities. Early detection can improve the prognosis of the patient.

2022 ◽  
Jiao He ◽  
chenglong deng ◽  
Cunfa Sun ◽  
Xiao-Xiao Zhang ◽  
Ying Cui ◽  

Bimetallic cluster ion pairs containing a quaternary phosphonium and an ultrasmall Cu2Ag3 anionic cluster protected by thiolates: (PPh3R″)[Cu2Ag3(SR′)6] (R′SH = cyclohexylthiol (CySH), R″ = Ph, 1; Me, 2; Et, 3;...

2021 ◽  
Vol 36 (2) ◽  
pp. 148-152
Sang Hoon Jeong ◽  
Jung Hwan Lee ◽  
Tae Hong Lee ◽  
Chang Hwa Choi

Spontaneous resolution or thrombosis of giant or ruptured intracranial aneurysms is occasionally reported. However, spontaneous resolution of unruptured aneurysms without any intervention is extremely rare. Recently, we encountered a case of spontaneous resolution of a small unruptured aneurysm of the anterior communicating artery. We describe this rare case and discuss the mechanism of resolution with a review of the related literature.

2021 ◽  
pp. 1-4
Mahdi Almubarak ◽  

Spontaneous resolution of NVD or NVE is very rare, to the best of our knowledge, only five cases reported in the literatures. In this paper we reported a case of spontaneous regression of NVD and NVE in fundus of type one young diabetic female patient with history of bariatric surgery 1 year prior to presentation. Patient was followed up for 2 years with stable clinical course and without developing any further DR and without receiving any treatment. we assumed that this autoregression of neovascularization could be related to her blood sugar control secondary to bariatric surgery. We noticed also all the previous reported five cases were young ages (31, 46, 27,26 and 19). This suggest the possibility of difference in the pathogenesis of proliferative retinopathy between type 1 and type II. Further studies are needed.

Diagnostics ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 30
Daisuke Tachibana ◽  
Takuya Misugi ◽  
Kohei Kitada ◽  
Yasushi Kurihara ◽  
Mie Tahara ◽  

We appreciate the interest in our paper, and we are grateful for the comment by Orsi et al. [...]

Diagnostics ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 21
Michele Orsi ◽  
Edgardo Somigliana

We read with great interest the paper entitled “Incarcerated gravid uterus: spontaneous resolution is not rare” by Tachibana et al. [...]

2021 ◽  
Vol Volume 9 (upjohns/volume9/Issue2) ◽  
pp. 47-50
N. Vishnu S. Reddy

ABSTRACT Rosai-Dorfman disease (RDD) is a rare histiocytic disorder commonly manifested as histiocytic proliferation of lymph nodes and extra nodal tissues initially described as a separate entity by Rosai and Dorfman under the term sinus histiocytosis with massive lymphadenopathy (SHML) in 1969. The treatment strategies can be variable and based on the severity of disease, v ital organ invol vement and pos s ible complications. The first case was a 47 years old female presenting with nasal obstruction and submandibular lymphadenopathy since few days. The second case was a 8 year old girl presented with stridor and lymphadenopathy in the submandibular region. In both the cases spontaneous resolution was expected and intervention was done only if there werecomplications. Patients were followed up every three months for two years and both the cases have resolved completely without any sequelae of the disease.Here we present two cases of Rosai-Dorfman disease presented to our hospital, this case series adds to the growing knowledge of Rosai-Dorfman di sease, along with under s tanding of pathophysiology, clinical diagnosis, treatment strategies and recovery options in cases where complications occurred.

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