ECG tutorial: Basic principles of ECG analysis - UpToDate
Aug 25, 2025 · The needle (or pen) of the ECG is deflected a given distance depending upon the voltage measured. The ECG waves are recorded on special graph paper that is divided into 1 …
ECG grid - UpToDate
The electrocardiogam is recorded on paper that has large boxes (heavy lines) of 0.5 cm sides. On the horizontal axis, each large box, which represents 0.2 seconds at a typical paper speed of …
Narrow QRS complex tachycardias: Clinical manifestations and
Aug 26, 2025 · This topic will focus primarily on using the ECG to differentiate among the types of narrow QRS complex tachycardia. The acute management of narrow QRS complex …
Left ventricular hypertrophy: Clinical findings and ECG diagnosis
Feb 14, 2025 · The electrocardiogram (ECG) is a useful but imperfect tool for detecting LVH. The utility of the ECG relates to its being relatively inexpensive and widely available.
Basic principles of electrocardiographic interpretation
Mar 13, 2024 · A variety of systems are available for storage of vast amounts of digital ECG data as part of electronic medical records. This topic will review the basic aspects of ECG …
ECG tutorial: ST- and T-wave changes - UpToDate
Sep 9, 2024 · ECG tutorial: ST- and T-wave changes Author: Jordan M Prutkin, MD, MHA, MHS Section Editor: Ary L Goldberger, MD Deputy Editor: Naomi F Botkin, MD
Wide QRS complex tachycardias: Approach to the diagnosis
Sep 3, 2024 · INTRODUCTION Tachycardias are broadly categorized (algorithm 1) based upon the width of the QRS complex on the electrocardiogram (ECG).
Pathogenesis and diagnosis of Q waves on the electrocardiogram
Nov 26, 2025 · By definition, a Q wave on the electrocardiogram (ECG) is an initially negative deflection of the QRS complex. Technically, a Q wave indicates that the net direction of early …
Right bundle branch block - UpToDate
Nov 4, 2024 · Right bundle branch block (RBBB), a pattern seen on the surface electrocardiogram (ECG), results when normal electrical activity in the His-Purkinje system is interrupted.
Basic approach to delayed intraventricular conduction
Oct 1, 2024 · Delayed intraventricular conduction is a common clinical abnormality detected on the electrocardiogram (ECG). This topic will review the basic aspects of this problem [1,2].