E.g. The PR segment vs. the PR interval. Intervals 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. The QRS interval covers the QRS complex from beginning to end. [The QRS complex also covers an interval]. The QT interval starts at the start of the QRS and ends at the end of the T wave. It denotes the electrical systole of the heart.**Intervals are only described based on their duration of time. You speak of it as a duration and so cannot talk about the morphology or depression or elevation of an interval.
In the ventricles, the last cells to depolarize are the first to repolarize. Why? 6.The first little hump is known as the P wave. It occurs when theatria depolarize (i.e. trigger).The next three waves constitute the QRS complex. Theyrepresent the ventricles depolarizing. These three are lumpedtogether because a normal rhythm may not have all three. Manytimes, you'll only see a R and an S. This is not abnormal. If thereare less than three, how do we know which one is which? Well,the R wave is the first wave ABOVE the isoelectric line. You thenname the waves in relation to the R wave. If it falls before the Rwave, it is called the Q wave; after the R wave is the S wave.7.ECG Question sAnswer the following (4pts) _________1. Name this part of the EKG segment. ______2.Name this part of the EKG segment. _________3.Name this part of the EKG. _________4.Name this part of the EKGA.ST SegmentB.QRS SegmentC.U WaveD.S Wave ____________5.Here is another. ________6.Name this part. ___________7.You think you got it , How about this ? ______________8.Name this part of the EKG.A.PR intervalB.R to R IntervalC.P WaveD.Q Wave Label (2pts)Determine Heart Rate ANSWER THE FOLLOWING(6PTS)1.a. The heart rate of this dysrhythmia is ___ beats per minute.D)58 What are the intervals and segments of ECG?Segments vs.. P wave = Atrial depolarization. ... . PR segment = depolarization of the AV node. ... . PR interval = Wave goes over the atrium and through the AV node and ends just before it activates the ventricles to depolarize.. Q wave = Ventricular Septal Depolarization.. What are normal waves on an ECG?The Normal ECG
The waves on an ECG include the P wave, Q wave, R wave, S wave, T wave and U wave. Interval: The time between two specific ECG events. The intervals commonly measured on an ECG include the PR interval, QRS interval (also called QRS duration), QT interval and RR interval.
What are the characteristics of a normal ECG?In the normal ECG the T wave is always upright in leads I, II, V3-6, and always inverted in lead aVR. ST segment depression is often characterized as "upsloping", "horizontal", or "downsloping". U wave amplitude is usually < 1/3 T wave amplitude in same lead.
How are an interval and a segment different?An interval (open interval) is a set of points on a line lying between two fixed points A and B, where A and B themselves are considered not to belong to the interval. A segment (closed interval) is a set of points between two points A and B, where A and B are included.
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