Molecular determinants of HERG channel block

K Kamiya, R Niwa, JS Mitcheson, MC Sanguinetti - Molecular pharmacology, 2006 - ASPET
Drug-induced block of cardiac hERG K + channels causes acquired long QT syndrome.
Here, we characterized the molecular mechanism of hERG block by two low-potency drugs (…

Pacing-induced spontaneous activity in myocardial sleeves of pulmonary veins after treatment with ryanodine

H Honjo, MR Boyett, R Niwa, S Inada, M Yamamoto… - Circulation, 2003 - Am Heart Assoc
Background— Recent clinical electrophysiology studies and successful results of radiofrequency
catheter ablation therapy suggest that high-frequency focal activity in the pulmonary …

Molecular determinants of hERG channel block by terfenadine and cisapride

K Kamiya, R Niwa, M Morishima, H Honjo… - Journal of …, 2008 - Elsevier
Block of cardiac hERG K + channels by the antihistamine terfenadine and the prokinetic agent
cisapride is associated with prolonged ventricular repolarization and an increased risk of …

Extended atrial conduction system characterised by the expression of the HCN4 channel and connexin45

…, H Dobrzynski, J Tellez, R Niwa… - Cardiovascular …, 2006 - academic.oup.com
Objective: In the heart, there are multiple supraventricular pacemakers involved in normal
pacemaking as well as arrhythmias and the objective was to determine the distribution of …

Carvedilol blocks the repolarizing K+ currents and the L-type Ca2+ current in rabbit ventricular myocytes

J Cheng, R Niwa, K Kamiya, J Toyama… - European journal of …, 1999 - Elsevier
Carvedilol ((±)-1-(carbazol-4-yloxy)-3-[[2-(o-methoxyphenoxy)ethyl]amino]-2-propanol), a β-adrenoceptor-blocking
agent with vasodilator properties, has been reported to produce dose-…

Low-frequency extracellular potentials recorded from the sinoatrial node

M Yamamoto, H Honjo, R Niwa… - Cardiovascular …, 1998 - academic.oup.com
Objective: To study the morphology of small extracellular potentials localized to the sinoatrial
(SA) node and to elucidate its potential usefulness in evaluating SA node dysfunction. …

Pacemaker shift in the rabbit sinoatrial node in response to vagal nerve stimulation

…, K Mitsui, H Honjo, M Yamamoto, R Niwa… - Experimental …, 2001 - Wiley Online Library
Effects of brief postganglionic vagal nerve stimulation on the activation sequence of the rabbit
sinoatrial (SA) node were investigated. Activation sequences in a small area (7 mm × 7 mm…

Revisitation of imaging features of skull base chondrosarcoma in comparison to chordoma

H Hasegawa, M Shin, R Niwa, S Koizumi… - Journal of Neuro …, 2022 - Springer
Purpose Pre-surgical diagnosis of skull base chondrosarcoma (SBC) is often challenging due
to the resemblance to chordoma. The goal of this study was to develop an optimal method …

Accurate preoperative identification of motor speech area as termination of arcuate Fasciculus depicted by Q-ball imaging tractography

…, E Yamazawa, Y Kushihara, Y Furuta, R Niwa… - World Neurosurgery, 2022 - Elsevier
Background Tractography is one way to predict the distribution of cortical functional domains
preoperatively. Diffusion tensor tractography (DTT) is commonly used in clinical practice, …

Heavy Ion Irradiation Reduces Vulnerability to Atrial Tachyarrhythmias―Gap Junction and Sympathetic Neural Remodeling―

…, N Kawabe, S Tanaka, T Shimokawa, R Niwa… - Circulation …, 2023 - jstage.jst.go.jp
Background: Low-invasive stereotactic body radiation therapy is a novel anti-arrhythmic
strategy. The mechanisms underlying its effects against ventricular tachycardia/fibrillation (VT/VF…