At the heart of ECG interpretation lies the ability to determine whether the ECG waves and intervals are normal. This chapter will focus on the ECG waves in terms of morphology (appearance), durations and intervals.

2025年2月2日 · Difference Between Segments and Intervals. PR segment: line that connects the end of the P wave with the beginning of the QRS complex. PR interval: from the beginning of the P wave until the beginning of the QRS complex — that is, including the P wave.

The waves, intervals, durations and assessment of rhythm is fundamental to ECG interpretation. Below follows a brief summary of the ECG waves, their appearance, terminology, physiological background and interpretation.

Learn about electrical vectors, depolarization, repolarization, intervals, segments, and ECG waves like PQ, RR, QRS, QT, ST, T, and U waves.

2020年9月26日 · Learn the meaning of each component of an EKG wave with this step-by-step labeled diagram of the conduction system of the heart. Provides information on atrial depolarization and the P wave, ventricular depolarization and the QRS complex, ventricular repolarization and the T wave, as well as the PR and ST segments.

2025年2月21日 · There are five primary waves in a standard ECG: P Wave: Represents the electrical activity in the atria (upper chambers of the heart). Q Wave: ... By learning the key components of an ECG—such as waves, intervals, segments, and complexes—you can become more confident in interpreting an ECG and understanding what it means for heart function.

An interval in an ECG is a duration of time that includes one segment and one or more waves. The PR (or PQ) interval starts at the start of the P wave and ends at the start of the QRS. It denotes the conduction of the impulse from the upper part of the atrium to the ventricle.

2015年3月2日 · The P wave represents the spread of a stimulus through the atria (atrial depolarization). The QRS complex represents stimulus spread through the ventricles (ventricular depolarization). The ST segment and T wave represent the return of stimulated ventricular muscle to the resting state (ventricular repolarization).

2016年3月6日 · It is important to recognise that segments and intervals are different entities. Segments should be examined to look for deviation from the isoelectric line while intervals should be analysed with reference to their duration. Segments. The PR segment commences at the endpoint of the P wave and ends at the start of the QRS complex.

The electrocardiogram (ECG) records from the body surface and registers the differences in electrical potential generated by the heart. The signal recorded is determined by action potentials generated by millions of individual cells and their sequence of activation.