Search Results - "Ropella, Kristina M"

Volatile anesthetics disrupt frontal-posterior recurrent information transfer at gamma frequencies in rat by Imas, Olga A., Ropella, Kristina M., Ward, B. Douglas, Wood, James D., Hudetz, Anthony G.

“…We seek to understand neural correlates of anesthetic-induced unconsciousness. We hypothesize that cortical integration of sensory information may underlie…”
Get full text

Isoflurane disrupts anterio-posterior phase synchronization of flash-induced field potentials in the rat by Imas, Olga A., Ropella, Kristina M., Wood, James D., Hudetz, Anthony G.

“…Consciousness presumes a set of integrated functions such as sensory processing, attention, and interpretation, and may depend upon both local and long-range…”
Get full text

Simultaneous ERP and fMRI of the auditory cortex in a passive oddball paradigm by Liebenthal, Einat, Ellingson, Michael L, Spanaki, Marianna V, Prieto, Thomas E, Ropella, Kristina M, Binder, Jeffrey R

“…Infrequent occurrences of a deviant sound within a sequence of repetitive standard sounds elicit the automatic mismatch negativity (MMN) event-related…”
Get full text

Monosynaptic functional connectivity in cerebral cortex during wakefulness and under graded levels of anesthesia by Vizuete, Jeannette A, Pillay, Siveshigan, Diba, Kamran, Ropella, Kristina M, Hudetz, Anthony G

“…The balance between excitation and inhibition is considered to be of significant importance for neural computation and cognitive function. Excitatory and…”
Get full text

Volatile anesthetics enhance flash-induced γ oscillations in rat visual cortex by IMAS, Olga A, ROPELLA, Kristina M, WARD, B. Douglas, WOOD, James D, HUDETZ, Anthony G

“…The authors sought to understand neural correlates of anesthetic-induced unconsciousness. Cortical gamma oscillations have been associated with neural…”
Get full text

Analysis and use of FMRI response delays by Saad, Ziad S., Ropella, Kristina M., Cox, Robert W., DeYoe, Edgar A.

“…In this study, we implemented a new method for measuring the temporal delay of functional magnetic resonance imaging (fMRI) responses and then estimated the…”
Get full text

Critical Changes in Cortical Neuronal Interactions in Anesthetized and Awake Rats by Hudetz, Anthony G, Vizuete, Jeannette A, Pillay, Siveshigan, Ropella, Kristina M

“…Neuronal interactions are fundamental for information processing, cognition, and consciousness. Anesthetics reduce spontaneous cortical activity; however,…”
Get full text

Comparison of randomized multifocal mapping and temporal phase mapping of visual cortex for clinical use by Ma, Yan, Ward, B Douglas, Ropella, Kristina M, Deyoe, Edgar A

“…fMRI is becoming an important clinical tool for planning and guidance of surgery to treat brain tumors, arteriovenous malformations, and epileptic foci. For…”
Get full text

Ischemia reperfusion dysfunction changes model-estimated kinetics of myofilament interaction due to inotropic drugs in isolated hearts by Rhodes, Samhita S, Camara, Amadou K S, Ropella, Kristina M, Audi, Said H, Riess, Matthias L, Pagel, Paul S, Stowe, David F

“…The phase-space relationship between simultaneously measured myoplasmic [Ca2+] and isovolumetric left ventricular pressure (LVP) in guinea pig intact hearts is…”
Get full text

The spatial extent of the BOLD response by Saad, Ziad S, Ropella, Kristina M, DeYoe, Edgar A, Bandettini, Peter A

“…Functional magnetic resonance imaging is routinely used to localize brain function, with multiple brain scans averaged together to reveal activation volumes…”
Get full text

Determination of low-pass filter cutoff frequencies for high-rate biomechanical signals obtained using videographic analysis by Fijalkowski, Ronald J, Ropella, Kristina M, Stemper, Brian D

“…Diffuse brain injury (DBI) commonly results from blunt impact followed by sudden head rotation, wherein severity is a function of rotational kinematics. A…”
Get more information

Estimation of FMRI response delays by Saad, Ziad S., DeYoe, Edgar A., Ropella, Kristina M.

“…We present an efficient algorithm using the Hilbert Transform for estimating the delay of the BOLD response to neuronal stimulation. With minimal additional…”
Get full text

Undergraduate biomedical imaging education by Paschal, Cynthia B, Nightingale, Kathy R, Ropella, Kristina M

“…Biomedical engineers, with their training in the life sciences as well as engineering, mathematics and physical sciences, are uniquely poised to both support…”
Get full text

How Inotropic Drugs Alter Dynamic and Static Indices of Cyclic Myoplasmic [Ca2+] to Contractility Relationships in Intact Hearts by Rhodes, Samhita S, Ropella, Kristina M, Camara, Amadou K. S, Chen, Qun, Riess, Matthias L, Stowe, David F

“…The authors examined effects of positive (dopamine and digoxin) and negative (nifedipine and lidocaine) inotropic interventions on the instantaneous cyclic…”
Get full text

Time-frequency coherence analysis of atrial fibrillation termination during procainamide administration by LOVETT, E. G, ROPELLA, K. M

“…A time-frequency coherence estimator is developed and applied to study changes in signal characteristics as atrial fibrillation converts to sinus rhythm during…”
Get full text

Microfocal X-ray computed tomography post-processing operations for optimizing reconstruction volumes of stented arteries during 3D computational fluid dynamics modeling by LaDisa, John F., Olson, Lars E., Ropella, Kristina M., Molthen, Robert C., Haworth, Steven T., Kersten, Judy R., Warltier, David C., Pagel, Paul S.

“…Restenosis caused by neointimal hyperplasia (NH) remains an important clinical problem after stent implantation. Restenosis varies with stent geometry, and…”
Get full text

Differentiation of atrial rhythms from the electrocardiogram with coherence spectra by Sarraf, Lara S., Roth, James A., Ropella, Kristina M.

“…Automated electrocardiogram (ECG) interpretation systems fail to reliably discriminate atrial fibrillation from sinus rhythm and other more regular atrial…”
Get full text

Graded defragmentation of cortical neuronal firing during recovery of consciousness in rats by Vizuete, J.A, Pillay, S, Ropella, K.M, Hudetz, A.G

“…Highlights • The spatiotemporal pattern of cortical unit activity is fragmented in deep anesthesia. • During emergence, high-intensity firing periods become…”
Get full text

Observations from intraatrial recordings on the termination of electrically induced atrial fibrillation in humans by Sih, H J, Ropella, K M, Swiryn, S, Gerstenfeld, E P, Sahakian, A V

“…The circulating wavelet hypothesis suggests that atrial fibrillation could terminate by either progressive fusion or simultaneous block of all wavelets…”
Get more information

Isoflurane‐induced preconditioning: electro‐mechanical uncoupling and mitochondrial KATP channel by Novalija, Enis, Ropella, Kristina M, Bosnjak, Zeljko J

“…Introduction Anesthetic preconditioning (APC) significantly attenuates electro‐mechanical uncoupling and consequently deterioration of cardiac function upon…”
Get full text