Inferior‐Lead Lambda (λ) Wave Revealing Critical Right Coronary Artery Stenosis: A Case Report

Annals of Noninvasive Electrocardiology 2026 Open access

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Authors: Jian Xiong, Djandan Tadum Arthur Vithran, Jiamin Chai, Zheng Cao, Zhixiao Wang, Xiaoyong Hu
DOI: 10.1111/anec.70169
Cited by: 0
References: 18

Abstract

Lambda (λ) waves are uncommon ECG markers of malignant arrhythmias, usually associated with channelopathies or transient ischemia. We report a 34-year-old man with recurrent syncope preceded by subxiphoid chest pain and diaphoresis. Admission ECG showed λ-like morphology in the inferior leads with dynamic ST changes. Laboratory tests and echocardiography were normal, while Holter monitoring demonstrated persistent ST-segment depression. Coronary angiography revealed diffuse right coronary artery disease with a critical 95% stenosis, treated with drug-eluting stent placement. ECG abnormalities resolved after PCI, and syncope did not return. Serial angiography over 3.5 years confirmed sustained stent patency.

Fields of Study & Subjects

Cardiac electrophysiology and arrhythmias Acute Myocardial Infarction Research Cardiac Imaging and Diagnostics

Publication details

Journal / source
Annals of Noninvasive Electrocardiology
Volume
31
Issue
2
Pages
e70169–e70169
Publication date
1 March 2026
Language
EN