Publications by authors named "Radhakrishnan D"

The pathophysiology of dystonia in Wilson disease (WD) is complex and poorly understood. Copper accumulation in the basal ganglia, disrupts dopaminergic pathways, contributing to dystonia's development via neurotransmitter imbalance. Despite advances in diagnosis and management, WD with dystonia remains a challenging condition to treat.

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Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) is a rare cause of NORSE. We describe the case of a young girl who presented with NORSE associated with MOGAD along with a systematic review of all cases of NORSE associated with MOGAD till date. Seizures associated with MOGAD are usually associated with good outcome but can occasionally be catastrophic and non-responsive to conventional therapies.

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Article Synopsis
  • The study aimed to identify genomic variations linked to dystonia in the Asian Indian population using next-generation sequencing.
  • A total of 745 individuals were enrolled, and whole exome sequencing (WES) was performed on 267 patients, revealing pathogenic variants in 20.2% of them, including 14 novel variants.
  • The gene THAP1 was found to be the most common associated with dystonia, and factors like multifocal/generalized distribution and family history increased the likelihood of finding positive results from WES.
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Background: Wilson's disease (WD) results from pathogenic ATP7B gene variations, causing copper accumulation mainly in the liver, brain, and kidneys.

Objectives: In India, despite studies on ATP7B variants, WD often goes undiagnosed, with the prevalence, carrier rate, and mutation spectrum remaining unknown.

Methods: A multicenter study examined genetic variations in WD among individuals of Indian origin via whole exome sequencing.

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  • A 50-year-old male exhibited a 10-year progression of cerebellar ataxia, multifocal dystonia with tremors, and abnormal eye movements but showed no cognitive decline or other neurological issues.
  • This case emphasizes the importance of accurately diagnosing adult-onset cerebellar ataxia by detailing the patient's symptoms and clinical evaluation.
  • It also illustrates how genomic testing, particularly whole-exome sequencing, can aid in understanding these complex conditions and enhance clinical phenotyping.
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Background: The precision child and youth mental health (PCYMH) paradigm has great potential to transform CYMH care and research, but there are numerous concerns about feasibility, sustainablity, and equity. Implementation science and evaluation methodology, particularly participatory logic models created with stakeholders, may help catalyze PCYMH-driven system transformation. This paper aims to: (1) report results of a PCYMH logic model scoping review; (2) present a case study illustrating creation of a participatory logic model for a PCYMH start-up; and (3) share the final model plus lessons learned.

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  • Autoimmune autonomic disorders are illnesses caused by the immune system attacking the autonomic nervous system, which controls involuntary body functions.
  • They can manifest as either hyperactivity (central issues) or failure (peripheral issues) of autonomic functions, leading to a mix of vague and varied symptoms, making diagnosis challenging.
  • Recent identification of specific autoantibodies has improved recognition and diagnosis, but management remains complicated due to the nonspecific nature of symptoms and rarity of these disorders.
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Background: Self-management education is integral for proper asthma management. However, there is an accessibility gap to self-management education following asthma hospitalizations. Most pediatric patients and their families receive suboptimal or no education.

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  • Two patients with established Wilson's disease had calcific myonecrosis in their pelvic girdles after pelvic fractures, complicating their treatment.
  • Despite initial benefits from chelation therapy, both experienced worsening ambulation, leading to concerns about neurological decline.
  • Investigation showed the issue was due to calcific myonecrosis, a previously unrecognized complication of Wilson's disease, which improved with intensive rehabilitation, suggesting early recognition could prevent further disability.
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  • The EAST-AIS trial aims to assess the effectiveness of tenecteplase for treating acute ischemic stroke in patients treated 4.5-24 hours after symptoms start, rather than the standard 4.5 hours.
  • The study involves 100 participants, with half receiving tenecteplase and the other half a placebo, focusing on patients with specific eligibility criteria such as age and stroke severity.
  • The main goal is to evaluate the safety and efficacy of tenecteplase, measured by the modified Ranking Scale (mRS) score 90 days after the stroke.
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  • * Diagnosis is confirmed by detecting antibodies in blood or cerebrospinal fluid, with immunoblot findings needing confirmation through immunofluorescence.
  • * A rare case of sensory neuronopathy showed multiple antibody positivity, highlighting how facial movement issues can indicate immune-mediated neurologic syndromes.
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The adaptive immune response critically hinges on the functionality of T cell receptors, governed by complex molecular mechanisms, including ubiquitination. In this study, we delved into the role of in T cell immunity, focusing on T cell-B cell conjugate formation and T cell activation. Using a CRISPR-Cas9 screening approach targeting deubiquitinases genes in Jurkat T cells, we identified BAP1 as a key positive regulator of T cell-B cell conjugate formation.

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Objective: Although previous studies have described phenomenological diagnoses, they lacked description of aetiological spectrum in patients visiting movement disorders (MD) service. Herein, we classify the MD phenomenology and describe aetiology wise distribution of each phenomenology in patients visiting a tertiary care movement disorders service.

Methods: Collected information included demographic profile (age of onset, age at presentation, gender, duration of illness before presentation), predominant MD phenomenology [such as parkinsonism, dystonia, ataxia, tremor, chorea, ballism, myoclonus, tics, stereotypy, restless legs syndrome (RLS) and others], diagnostic evaluations and detected aetiology.

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Background: Despite asthma guidelines' recommended emergency department preventative strategies (EDPS), repeat asthma-related emergency department (ED) visits remain frequent.

Methods: We performed a retrospective cohort study of children aged 1-17 years presenting with asthma to the Children's Hospital of Eastern Ontario (CHEO) ED between September 1, 2014 - August 31, 2015. EDPS was defined as provision of education on trigger avoidance and medication technique plus documentation of an asthma action plan, a prescription for an inhaled controller medication or referral to a specialist.

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This study undertook an exploration of how Adaptive Mentoring Networks focusing on chronic pain, substance use disorders and mental health were supporting primary care providers to engage in compassionate care. The study utilised the Cole-King & Gilbert Compassionate Care Framework to guide qualitative semi-structured interviews of participants in two Adaptive Mentoring Networks in Ontario, Canada. Fourteen physician participants were interviewed including five mentors (psychiatrists) and nine mentees (family physicians) in the Networks.

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  • A middle-aged man experienced a sudden and severe loss of hearing in both ears.
  • This unusual symptom was linked to an underlying health issue, specifically metastatic gastric cancer.
  • The case highlights how unexpected health changes can sometimes indicate serious medical conditions.
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Background: Variants in the TUBB4A gene are associated with dystonia (DYT-TUBB4A), Hypomyelination with Atrophy of the Basal Ganglia and Cerebellum (H-ABC) and spastic paraplegia. Phenotypes intermediate to these three broad phenotypes are also observed. These are rare disorders, and data from diverse populations remains limited.

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Background: Adenotonsillectomy and tonsillectomy (referred to as tonsillectomy hereafter) are common pediatric surgeries. Postoperative complications include hemorrhage requiring surgery (2 to 3% of cases) and pain. Although nonsteroidal anti-inflammatory drugs are commonly administered for postsurgical pain, controversy exists regarding bleeding risk with cyclooxygenase-1 inhibition and associated platelet dysfunction.

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  • The study examines the link between obstructive sleep apnea (OSA) and mental health issues in children, using Ontario health data from 2009 to 2016.
  • It finds that children with OSA had quicker access to mental healthcare after diagnosis but fewer overall encounters after treatment than those without OSA.
  • Treatment for OSA (adenotonsillectomy or positive airway pressure therapy) significantly reduced the likelihood of mental healthcare encounters two years post-treatment compared to before.
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