Publications by authors named "Arun Kumar Krishnan"
Article Synopsis
- - Noninvasive ventilation (NIV) is commonly used to treat acute respiratory failure, but about half of patients may still need further intervention like intubation.
- - A study analyzed 104 patients, comparing successful NIV treatments with those that failed, focusing on factors such as initial respiratory rate and PaO/FiO ratio, which significantly differed between groups.
- - The findings suggest that identifying specific signals at the beginning of treatment can help predict NIV failure, potentially leading to quicker decisions for intubation when necessary.
Attending to peripheral visual targets while maintaining central fixation, a process that involves covert attention, reduces fixation stability. Here, we tested the hypothesis that changes in fixation stability induced by peripheral viewing contribute to crowding in peripheral vision by increasing positional uncertainty. We first assessed whether fixation was less stable during peripheral versus central (foveal) viewing for both crowded and uncrowded stimuli.
View Article and Find Full Text PDFBackground: The current standard followed for assessing central venous catheter (CVC) tip placement location is through radiological confirmation using chest X-ray (CXR). Placement of CVCs under electrocardiogram (ECG) guidance may save cost and time compared to CXR.
Objective: The objective of this study is to compare the accurate placement of the CVC tip using anatomical landmark technique with ECG-guided technique.
Observers with central field loss typically fixate within a non-foveal region called the preferred retinal locus, which can include localized sensitivity losses, or micro-scotomas (Krishnan and Bedell, 2018). In this study, we simulated micro-scotomas at the fovea and in the peripheral retina to assess their impact on reading speed. Ten younger (<36 years old) and 8 older (>50 years old) naïve observers with normal vision monocularly read high and/or low contrast sentences, presented at or above the critical print size for young observers at the fovea and at 5 and 10 deg in the inferior visual field.
View Article and Find Full Text PDFFunctional changes at the preferred retinal locus in subjects with bilateral central vision loss.
Graefes Arch Clin Exp Ophthalmol
January 2018
Purpose: Subjects with bilateral central vision loss (CVL) use a retinal region called the preferred retinal locus (PRL) for performing various visual tasks. We probed the fixation PRL in individuals with bilateral macular disease, including age-related macular degeneration (AMD) and Stargardt disease (STGD), for localized sensitivity deficits.
Methods: Three letter words at the critical print size were presented in the NIDEK MP-1 microperimeter to determine the fixation PRL and its radial retinal eccentricity from the residual fovea in 29 subjects with bilateral CVL.