the R wave reflects depolarization of the main mass of the ventricles –hence it is the largest wave. the S wave signifies the final depolarization of the ventricles, at the base of the heart.
What does the R wave signify?
the R wave reflects depolarization of the main mass of the ventricles –hence it is the largest wave. the S wave signifies the final depolarization of the ventricles, at the base of the heart.
What does enlarged R wave indicate?
Increased right-sided muscle mass results in increased rightward depolarization that manifests as a tall R wave in V1. The common etiology is hypertrophic cardiomyopathy.
What does abnormal R wave mean?
Abstract. Poor R-wave progression is a common ECG finding that is often inconclusively interpreted as suggestive, but not diagnostic, of anterior myocardial infarction (AMI).
What does poor R wave progression mean?
Poor wave progression has been variably defined as the failure to of the R wave to progress in amplitude (R<3mm in V3) , reversal of the progression (eg R in V2>V3), or delayed transition beyond V4.
Is poor R wave progression bad?
Poor R wave progression is used as an interpretative term in clinical electrocardiography to infer that the precordial R wave voltage is abnormal , most often secondary to previous ischemic damage. Specific definition and predictive value of the term are, however, lacking for most clinical settings.
Why is the Q wave a downward deflection?
As septal depolarization moves from left to right, the depolarization vector is directed towards the – electrode of lead II (RA), and therefore a negative-going deflection (Q-wave) is produced.
What causes high R waves?
The most common cause of a dominant R wave in aVR is incorrect limb lead placement , with reversal of the left and right arm electrodes. This produces a similar pattern to dextrocardia in the limb leads but with normal R-wave progression in the chest leads.
How tall should an R wave be?
R-wave amplitude
R-wave should be < 26 mm in V5 and V6.
What do the R and S waves show on the EKG?
The Q Wave is the first negative deflection in the QRS Complex not preceded by an R Wave. The R Wave is the first positive defection in the QRS Complex. The S Wave is the first negative deflection that extends below the baseline in the QRS Complex that follows the R Wave.
What does anterior myocardial infarction mean?
An anterior wall myocardial infarction occurs when anterior myocardial tissue usually supplied by the left anterior descending coronary artery suffers injury due to lack of blood supply.
What is abnormal ECG?
An abnormal ECG can mean many things. Sometimes an ECG abnormality is a normal variation of a heart’s rhythm , which does not affect your health. Other times, an abnormal ECG can signal a medical emergency, such as a myocardial infarction /heart attack or a dangerous arrhythmia.
What is good R wave progression?
The R wave should progress in size across leads V1 to V6 . Normally, in lead V1, there is a small R wave with a deep S wave; the R-wave amplitude should increase in size with the transition zone, normally in leads V2 to V4.
What happens during the T wave?
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 left atrial abnormality mean?
The term left atrial abnormality is used to imply the presence of atrial hypertrophy or dilatation, or both . Left atrial depolarisation contributes to the middle and terminal portions of the P wave. The changes of left atrial hypertrophy are therefore seen in the late portion of the P wave.
What is low voltage in ECG?
Low voltage on the ECG is defined as a peak-to-peak QRS amplitude of less than 5 millimeters in the limb leads and/or less than 10 millimeters in the precordial leads . Enlarge. Low voltage may be present in the following situations: Obesity. Chronic obstructive pulmonary disease, or COPD.
