Publications by authors named "Narendran N"

Objectives: The 36-month XTEND (NCT03939767) multicentre, observational, prospective study examined the effectiveness of proactive treatment regimens of intravitreal aflibercept (IVT-AFL) 2 mg in treatment-naïve patients with neovascular age-related macular degeneration (nAMD) in routine clinical practice. The 12- and 24-month outcomes from the XTEND UK cohort are reported.

Methods: Patients aged ≥50 years with nAMD planned to receive IVT-AFL 2 mg were eligible.

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  • The study aimed to assess the risk of reoperation in patients with spine deformities undergoing major surgeries from the thoracic to pelvis region over a 10-year period, using a large dataset.
  • Out of 7,062 patients, the overall reoperation rate was found to be 23.2%, with specific rates of 16.9% at 2 years and 22.1% at 5 years; factors like preoperative kyphosis and extensive instrumentation were linked to higher risk.
  • Key findings indicated that using interbody cages reduced reoperation risk, while age, medical conditions, and the presence of osteotomies did not significantly affect outcomes.
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Purpose: The inclusion of ranibizumab biosimilars into National Health Service England commissioning recommendations published in 2022 created a need for expert guidance to optimize treatment outcomes in patients with neovascular age-related macular degeneration (nAMD) who otherwise may not have received first-line ranibizumab. This article provides a consensus treatment pathway supporting timely identification and management of a suboptimal response to these therapies, thereby aiming to facilitate clinically meaningful outcomes and efficient management of service capacity under specific circumstances where ranibizumab biosimilars may be initiated as a first-line treatment.

Methods: Two structured round-table meetings of UK medical retina specialists were held in person and virtually on September 22 and November 3, 2022, respectively.

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Background: The current literature investigating surgical treatments for lumbar spondylolisthesis in adolescent patients is limited by small sample sizes. There are high reoperation rates, and posterior interbody fusion has not been reported to help. The current study aimed to utilize a nationwide database to investigate outcomes of spinal fusion for spondylolisthesis in young patients.

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  • Acute exacerbations of chronic rhinosinusitis (AECRS) are often worsened by rhinovirus (RV) infections, and the study investigates genetic risk factors associated with these infections, focusing on the CDHR3 gene.
  • In a year-long study, individuals carrying the minor allele rs6967330 showed significantly higher rates of RV and bacterial infections compared to those with the major allele.
  • The study also found that nasal airway cultures from minor allele carriers had higher levels of viral replication and exhibited changes in immune response pathways, suggesting that these genetic factors affect how the body responds to RV infections.
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Background: Acute exacerbations of chronic rhinosinusitis (AECRS) are thought to arise from common viral infections progressing to secondary bacterial infections. However, the pathophysiology of AECRS remains poorly understood due to a lack of prospective longitudinal studies.

Methods: We conducted a one-year prospective longitudinal study involving chronic rhinosinusitis (CRS) adults.

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Case: A healthy 15-year-old male competitive hockey player presented with acute-on-chronic lower back pain was found to have a bilateral pars defect. After conservative treatment, subsequent computed tomography imaging demonstrated partial healing of the right-sided facet fracture but persistent left-sided pars fracture. A novel technique was performed, using robotic navigation to assist in laminar screw placement and to determine the optimal trajectory for subsequent microscopic surgery and bone grafting.

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Background: Pain is multifactorial, and pain intensity has been shown to be influenced by patients' thoughts. The Negative Pain Thoughts Questionnaire Short Form (NPTQ-SF) can be used to quantify unhelpful negative cognitive biases about pain, but the relationship between negative pain thoughts and orthopaedic surgery outcomes is not known.

Purpose: To evaluate the prevalence of negative pain thoughts in patients undergoing arthroscopic meniscectomy using the NPTQ-SF survey and assess the relationship these thoughts have to knee function, general health, pain, and satisfaction before and after surgery.

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Background Context: Facet joint violation by pedicle screws may lead to adjacent-segment disease and postoperative pain. Previous studies have reported the incidence of rostral facet joint violation using various pedicle screw insertion techniques. However, the incidence of facet joint violations with robotic guidance has not been determined.

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Article Synopsis
  • The thoracolumbar junction is a complex area of the spine that poses challenges for surgical approaches due to its complicated anatomy.
  • A 54-year-old woman with Stage IV breast cancer and severe low back pain underwent a minimally invasive surgery for spinal issues stemming from her cancer.
  • The procedure involved a corpectomy at L1, installation of an expandable cage, and robotic-assisted fixation of spinal segments from T11 to L3, highlighting advancements in surgical techniques for cancer patients.
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Study Design: Retrospective Matched Cohort.

Objective: Despite known consequences to the facet joints following lumbar total disc replacement (TDR), there is limited data on facet injection usage for persistent postoperative pain. This study uses real-world data to compare the usage of therapeutic lumbar facet injections as a measure of symptomatic facet arthrosis following single-level, stand-alone TDR vs anterolateral lumbar interbody fusion (ALIF/LLIF).

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Objective: Current cost-effectiveness analyses (CEA) emphasize drug costs as the differentiator between NICE recommended anti-VEGF treatments but may neglect real-world non-drug costs of running nAMD services in the UK. To address this, this study identified real-world non-drug service cost items relevant to UK NHS nAMD clinics, including costs arising from operational strain (demand exceeding capacity).

Methods: Cost items were identified by a structured literature review of peer-reviewed and grey literature, and an expert panel of 10 UK-based ophthalmologists with relevance to real-world practice.

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Background/objectives: Rare genetic disorders causing specific congenital developmental abnormalities often manifest in single families. Investigation of disease-causing molecular features are most times lacking, although these investigations may open novel therapeutic options for patients. In this study, we aimed to identify the genetic cause in an Iranian patient with severe skeletal dysplasia and to model its molecular function in zebrafish embryos.

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Study Design: Retrospective Cohort.

Objectives: Most data regarding cervical disc arthroplasty (CDA) outcomes are from highly controlled clinical trials with strict inclusion/exclusion criteria. This study aimed to identify risk factors for CDA reoperation, in "real world" clinical practice using a national insurance claims database.

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Case: A healthy 5-year-old boy presented with a gradual onset of headaches and acute global right-sided weakness over 10 days. The work-up revealed unstable os odontoideum leading to multiple posterior circulation infarcts with vertebral artery dissection. He underwent antiplatelet therapy, cervical collar immobilization, and delayed occiput to C2 posterior spinal fusion and instrumentation with iliac crest autograft.

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Article Synopsis
  • Brugada syndrome, primarily caused by loss-of-function variants, has only about 20% of cases explained by known genetic factors; recent studies point to the role of microtubule dynamics in the syndrome.
  • Researchers used CRISPR/Cas9 to create a knockout zebrafish model and conducted various experiments like voltage mapping, ECG, and immunocytochemistry to evaluate cardiac function.
  • Findings showed that knockout hearts had impaired electrical activity and disorganized cell junctions, with a notable improvement when adjusting microtubule dynamics through targeted interventions.
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Study Design: Retrospective cohort study.

Objective: This study compares reoperation rates and complications following single-level anterior lumbar interbody fusion (ALIF)/lateral lumbar interbody fusion (LLIF) and transforaminal lumbar interbody fusion (TLIF)/posterior lumbar interbody fusion (PLIF).

Summary Of Background Data: ALIF, LLIF, TLIF, and PLIF are widely used for degenerative disc disease.

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Introduction: Management of spondylolysis in adolescents is generally successful with conservative management. Uncommonly, surgical fixation is necessary for refractory cases. Direct repair with intralaminar screws is one commonly utilized technique.

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Purpose: Geographic access to physicians has been shown to be unevenly distributed in the USA, with those in closer proximity having superior outcomes. The purpose of this study was to describe how geographic access to pediatric neurosurgeons varies across socioeconomic and demographic factors.

Methods: Actively practicing neurosurgeons were identified by matching several registries and membership logs.

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Background: Left ventricular (LV) relaxation is affected by hypertension. The inflammatory mediators produced in response to systemic inflammation, such as in periodontal disease, may also alter ventricular mechanics and the existing ventricular dysfunction. Thus, the systemic inflammatory burden which occurs in response to chronic periodontitis may alter myocardial activity.

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The choice of disposal method of used pressurized metered dose inhalers and spacers by families of children with asthma were evaluated by a questionnaire. The disposal methods used for inhalers and spacers by the 120 children enrolled included giving to plastic/metal waste collectors (28.3% and 33.

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Objectives: This report, based on guidance from a panel of UK retina specialists, introduces a revised intravitreal aflibercept (IVT-AFL) treat-and-extend (T&E) pathway for the treatment of neovascular age-related macular degeneration (nAMD). The T&E pathway incorporates the updated IVT-AFL label (April 2021) allowing flexible treatment intervals of 4 weeks to 16 weeks, after three initiation doses and a further dose after 8 weeks. Practical guidance is provided on the clinical implementation of the revised pathway, with the aim of supporting clinical decision-making to benefit patients and addressing capacity issues in nAMD services.

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