What is the wave after T wave?
What is the wave after T wave?
The ‘U’ wave is a wave on an electrocardiogram (ECG). It comes after the T wave of ventricular repolarization and may not always be observed as a result of its small size. ‘U’ waves are thought to represent repolarization of the Purkinje fibers.
Why is the T wave an upward deflection?
T and U waves The T wave represents ventricular repolarization. Generally, the T wave exhibits a positive deflection. The reason for this is that the last cells to depolarize in the ventricles are the first to repolarize.
What does small T wave mean?
The T wave is the most labile wave in the ECG. T wave changes including low-amplitude T waves and abnormally inverted T waves may be the result of many cardiac and non-cardiac conditions. The normal T wave is usually in the same direction as the QRS except in the right precordial leads (see V2 below).
What are the different types of T wave progression?
T-wave progression follows the same rules as R-wave progression (see earlier discussion). I, II, -aVR, V5 and V6: should display positive T-waves in adults. aVR displays a negative T-wave. III and aVL: These leads occasionally display an isolated (single) T-wave inversion. aVF: positive T-wave, but occasionally flat.
What does it mean when the T wave is negative?
T-wave inversion means that the T-wave is negative. The T-wave is negative if its terminal portion is below the baseline, regardless of whether its other parts are above the baseline. T-wave inversions are frequently misunderstood, particularly in the setting of ischemia.
Which is more symmetrical the T wave or the St wave?
The T-wave is normally slightly asymmetric since its downslope (second half) is steeper than its upslope (first half). Women have a more symmetrical T-wave, a more distinct transition from ST segment to T-wave and lower T-wave amplitude.
What are the characteristics of a T wave ECG?
The T-wave reflects the rapid repolarization of contractile cells (phase 3) and T-wave changes occur in a wide range of conditions. T-wave changes are frequently misunderstood in clinical practice, which the discussion below will attempt to cure. The transition from the ST segment to the T-wave should be smooth (and not abrupt).
What are the characteristics of a normal T wave?
The normal T-wave is slightly asymmetric, with a steeper downward slope. The U-wave is seen occasionally. It is a positive wave occurring after the T-wave. Its amplitude is generally one-fourth of the T-wave’s amplitude.
What are the different types of T wave inversions?
T-wave inversion (inverted / negative T-waves) 1 Normal T-wave inversion. An isolated (single) T-wave inversion in lead V1 is common and normal. 2 T-wave inversion in myocardial ischemia. Ischemia never causes isolated T-wave inversions. 3 Secondary T-wave inversion.
Where are the flat T waves located in the heart?
If the stenosis/occlusion is located in the left circumflex artery or right coronary artery, the flat T-waves are seen in leads II, aVF and III. A biphasic T-wave have a positive and a negative deflection (Figure 37, panel C).
Which is the best description of a P wave?
Waves, Intervals, Segments, and Complexes A. P wave 1. The first deflection of the cardiac cycle 2. Represents depolarization of the atria 3. Begins as the waveform begins to leave the baseline, and ends when it returns to baseline 4. Normal: Location – precedes every QRS complex b) Amplitude – 0.5 to 2.5 mm high Rounded