Publications by authors named "Varma N"

Background: Better risk stratification is needed to evaluate patients with non-ischemic cardiomyopathy (NICM) for prophylactic implantable cardioverter-defibrillators (ICD). Growing evidence suggests cardiac magnetic resonance imaging (CMR) may be useful in this regard.

Objective: We aimed to determine if late-gadolinium enhancement (LGE) seen on CMR (dichotomized as none/minimal <2% vs significant ≥2%) predicts appropriate ICD therapies (primary endpoint) and/or all-cause mortality/transplant/left-ventricular assist device (LVAD) implantation (secondary endpoint) in NICM patients.

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Background: Despite advances in ablation and other therapies for AF, progression of atrial fibrillation (AF) remains a significant clinical problem, associated with worse prognosis and worse treatment outcomes. Upstream therapies targeting inflammatory or antifibrotic mechanisms have been disappointing in preventing AF progression, but more recently genetic and genomic studies in AF suggest novel cellular and metabolic stress targets, supporting prior studies of lifestyle and risk factor modification (LRFM) for AF. However, while obesity is a significant risk factor, weight loss and risk factor modification have not been successfully applied in a US population with AF.

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Background: There have been limited data examining the temporal relationship between device-derived daily activity and ventricular arrhythmias (VAs).

Objective: We aimed to assess whether activity predicted VAs or VAs predicted changes in activity.

Methods: The CERTITUDE registry includes over 55,000 implanted devices active on Home Monitoring.

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Background: Delivering care in medically underserved areas (MUA) is a public health challenge.

Objectives: The purpose of this study was to evaluate the advantages of a noncommercial multivendor solution for remote interrogation and programming of cardiac implantable electronic devices (CIEDs) among inhabitants of MUAs.

Methods: This prospective comparative study evaluated benefits and safety of remote CIEDs evaluation in patients living >100 km from the Bordeaux University Hospital.

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Background: Adherence to recommended follow-up schedules for remote monitoring (RM) of patients with implantable cardioverter-defibrillators (ICDs) is inconsistent, which may influence clinical outcomes. Systematic organization through a "third-party" universal monitoring system (UMS) may be beneficial.

Objective: We aimed to evaluate the clinical impact of RM and any incremental benefit of UMS vs conventional RM.

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Background: Stainless steel (SS) orthodontic brackets may have varying corrosion resistance when used with mouthwashes during orthodontic treatment. Studying their effects on orthodontic brackets will be beneficial.

Aim: The study's objective was to analyze the surface characteristics of SS orthodontic brackets and their resistance to corrosion, exposed to chlorhexidine and povidone-iodine mouth rinses - an and study.

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The rapid growth in consumer-facing mobile and sensor technologies has created tremendous opportunities for patient-driven personalized health management. The diagnosis and management of cardiac arrhythmias are particularly well suited to benefit from these easily accessible consumer health technologies. In particular, smartphone-based and wrist-worn wearable electrocardiogram (ECG) and photoplethysmography (PPG) technology can facilitate relatively inexpensive, long-term rhythm monitoring.

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The impact of T-regulatory cells (Tregs), PD-1 + CD8 T-cells, and their dynamics during treatment with imatinib mesylate remains poorly understood in patients with chronic myeloid leukemia (CML). We conducted a prospective study on newly diagnosed, treatment-naïve adult (> 18 years old) patients with CML in the chronic phase (CP) and age- and sex-matched controls. Peripheral blood samples were collected at diagnosis and after three months of imatinib therapy to assess Tregs and PD-1 + CD8 T-cell levels using flow cytometry.

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Unlike second-generation tyrosine kinase inhibitors, effects of imatinib on the cardiovascular (CV) system are debatable. The current case-control study aimed to evaluate the CV effects of imatinib in patients with chronic myeloid leukemia (CML) using non-invasive 2D-echocardiography testing. Patients with CML ≥ 13 years attending the adult haematology clinic of a tertiary care hospital in north India were prospectively enrolled over 1.

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Incorporation of the trimethoxyphenyl group at position 7 of flavin can drastically change the photophysical properties of flavin. We show unique fast singlet (π,π*) excited state deactivation pathway through nonadiabatic transition to the (n,π*) excited- state, and subsequent deactivation to the ground electronic state (S), closing the photocycle. This mechanism explains the exceptionally weak fluorescence and the short excited-state lifetime for the flavin trimethoxyphenyl derivative and the lack of excited triplet T state formation.

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Article Synopsis
  • Patients prioritize achieving ideal aesthetics in dental treatments, making color stability of materials essential.
  • Discoloration of dental resins can result from both intrinsic and extrinsic factors, prompting a detailed investigation of commonly used materials.
  • The study revealed that surface smoothness helps limit discoloration from liquids like coffee, tea, and wine, with acceptable levels maintained even after prolonged exposure.
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  • A significant portion of heart failure patients (around 30%) do not respond to cardiac resynchronization therapy (CRT), especially those with QRS durations between 120-149 ms who receive inconsistent benefits.
  • A study evaluated the effectiveness of cardiac contractility modulation (CCM) in improving heart failure-related hospitalizations, left ventricular ejection fraction (LVEF), and quality of life in patients with this specific QRS duration.
  • Results showed that CCM reduced hospitalizations by 72%, improved LVEF by 7%, and positively affected quality of life, with outcomes similar to those seen in patients with shorter QRS durations; mortality within the first year was not significantly different from predictions.
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  • Vascular access complications are common in catheter ablation procedures for ventricular arrhythmias, and the impact of vascular closure devices (VCDs) on these complications is unclear.
  • This study analyzed 1,016 catheter ablation procedures over four years, categorizing cases based on the use of VCDs: none (manual compression), partial use, or complete use.
  • Results showed that the use of VCDs, especially complete VCDs, significantly reduced the rate of vascular complications compared to manual compression and partial use of VCDs.
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Background: The risk of ventricular arrhythmias (VAs) after cardiac resynchronization therapy (CRT) has been associated with ischemic disease/scar, sex, and possibly left ventricular mass (LVM).

Objective: The purpose of this study was to evaluate sex differences and baseline/postimplant change in LVM on VA risk after CRT implantation in patients with nonischemic cardiomyopathy and left bundle branch block.

Methods: In patients meeting the criteria, baseline and follow-up echocardiographic images were obtained for LVM assessment.

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Introduction Diabetes mellitus (DM) is a multifaceted metabolic disorder distinguished by elevated blood sugar levels. Type 2-DM (T2DM) stands as a significant contributor to disability due to its widespread occurrence of microvascular and macrovascular complications. According to certain researchers, prolonged elevated blood sugar levels have been observed to trigger a sequence of irregular alterations in the Achilles tendon (AT).

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Background: Wearables are increasingly used by patients with atrial fibrillation (AF) for symptom monitoring and health management, but their impact on patient health care use and psychological well-being is not well understood.

Methods And Results: In this retrospective, propensity-matched study of patients with AF, survey and electronic health record data were merged to compare AF-specific health care use (outpatient/inpatient visits, rhythm-related testing, and procedures) and informal health care use (telephone calls and patient portal messages) over a 9-month period between wearable users and nonusers. We also examined the effects of wearable cardiac monitoring features (eg, heart rate alerts, irregular rhythm notification, and ECG) on patient behavior and well-being.

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Article Synopsis
  • A study assessed whether the heart rate score (HRSc) after pacemaker (PM) implantation can predict new atrial high-rate episodes (AHREs) in patients with sinus node dysfunction (SND).
  • Researchers evaluated 130 patients over nearly 49 months, finding that a higher HRSc (≥80%) was linked to an increased risk of AHREs compared to lower scores.
  • The results suggest that HRSc ≥80% may serve as a useful predictor of AHREs, potentially influencing treatment decisions for patients with SND.
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Background: Studies have reported that female sex predicts superior cardiac resynchronization therapy (CRT) response. One theory is that this association is related to smaller female heart size, thus increased relative dyssynchrony at a given QRS duration (QRSd). Our objective was to investigate the mechanisms of sex-specific CRT response relating to heart size, relative dyssynchrony, cardiomyopathy type, QRS morphology, and other patient characteristics.

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Background: Immune dysregulation is crucial in the pathogenesis of acquired aplastic anaemia (aAA). There is paucity of data regarding correlation of baseline cytokine profile with treatment response in aAA.

Objective: Present prospective case-control study aimed to correlate the baseline cytokines in patients with aAA with the treatment response.

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Background: Detection and containment of hospital outbreaks currently depend on variable and personnel-intensive surveillance methods. Whether automated statistical surveillance for outbreaks of health care-associated pathogens allows earlier containment efforts that would reduce the size of outbreaks is unknown.

Methods: We conducted a cluster-randomized trial in 82 community hospitals within a larger health care system.

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Article Synopsis
  • The study examined the 4G/5G polymorphism in the plasminogen activator inhibitor-1 (PAI-1) gene to determine its link to deep vein thrombosis (DVT) in an Indian population.
  • Results indicated that the 4G/5G polymorphism itself did not significantly increase DVT risk, despite some previous studies suggesting otherwise.
  • However, individuals with the 4G/4G genotype showed a significant association with protein C deficiency and had lower PAI-1 levels compared to controls, indicating potential complex interactions with other thrombophilic risk factors.
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Background: Four different designs of mini-implant-assisted rapid palatal expansion (MARPE) and protraction in nasomaxillary complex and mid-palatal sutures in late adolescent skeletal Class III malocclusion were compared using a three-dimensional finite element analysis.

Methods: A finite element model of skull and related sutures was constructed using the computed tomography scan of a 16-year-old female patient with skeletal Class III and ANB of -2°. Four appliance designs: Type I: MARPE with palatal force, Type II: MARPE with buccal force, Type III: Hybrid hyrax with palatal force, and Type IV: Hybrid hyrax with buccal force.

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