Transient Ischemic Right Axis Deviation Tendency of the Frontal Plane QRS Axis in a Case of Inferior Myocardial Ischemia

Kohei Hasegawa; Tomofumi Takaya; Shumpei Mori; Fumitaka Soga; Hachidai Takahashi; Daisuke Terashita; Hiromasa Otake; Ken-ichi Hirata

doi:10.1536/ihj.15-363

Case Reports

Transient Ischemic Right Axis Deviation Tendency of the Frontal Plane QRS Axis in a Case of Inferior Myocardial Ischemia

Kohei Hasegawa, Tomofumi Takaya, Shumpei Mori, Fumitaka Soga, Hachidai Takahashi, Daisuke Terashita, Hiromasa Otake, Ken-ichi Hirata

Author information

Kohei Hasegawa
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Tomofumi Takaya
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Shumpei Mori
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Fumitaka Soga
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Hachidai Takahashi
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Daisuke Terashita
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Hiromasa Otake
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine
Ken-ichi Hirata
Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine

Keywords: Unstable angina pectoris, Electrocardiography, Cardiac conduction system, Coronary angiography, QRS axis deviation

JOURNAL FREE ACCESS

2016 Volume 57 Issue 3 Pages 363-366

DOI https://doi.org/10.1536/ihj.15-363

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Abstract

A 73-year-old man was admitted to our hospital because of chest pain at rest. Electrocardiography (ECG) showed an ST-segment depression, a negative U-wave in the precordial leads, and a right axis deviation (RAD) tendency. Coronary angiography revealed occlusion of the right coronary artery. Collateral flow from the jeopardized left anterior descending artery to the posterior descending artery (PDA) was fair. After successful revascularization, improvement in the ECG findings was noted. Since blood supply to the left posterior fascicle is dependent on the PDA, the RAD tendency could be explained by the presence of a transient ischemic left posterior hemiblock.

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