What does deflection mean in ECG?
A wave of depolarization traveling toward a positive electrode results in a positive deflection in the ECG trace. A wave of depolarization traveling away from a positive electrode results in a negative deflection. A wave of repolarization traveling toward a positive electrode results in a negative deflection.
What are the three different deflection waves?
As the name suggests, the QRS complex includes the Q wave, R wave, and S wave. These three waves occur in rapid succession. The QRS complex represents the electrical impulse as it spreads through the ventricles and indicates ventricular depolarization.
What do the P QRS and T waves represent?
The P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.
Why is the Q wave a downward deflection?
QRS wave complex The rule is: if the wave immediately after the P wave is an upward deflection, it is an R wave; if it is a downward deflection, it is a Q wave: small Q waves correspond to depolarization of the interventricular septum. Q waves can also relate to breathing and are generally small and thin.
What is a positive deflection on ECG?
ECG> Basics the fact that when a wavefront of depolarization travels towards the + electrode and away from the electrode attached to the – terminal, a positive-going deflection will result.
What is the first of the deflection waves on a typical ECG?
The first deflection is the P wave associated with right and left atrial depolarization. Wave of atrial repolarization is invisible because of low amplitude.
What is the heart doing during the T wave?
The T wave on the ECG (T-ECG) represents repolarization of the ventricular myocardium. Its morphology and duration are commonly used to diagnose pathology and assess risk of life-threatening ventricular arrhythmias.
What is R wave?
The R wave is the first upward deflection after the P wave. The R wave represents early ventricular depolarisation.
What does no P wave mean?
Absence of P waves suggests either. No normal atrial depolarization, e.g., atrial fibrillation, atrial standstill. The P waves are hidden within the QRS complexes, e.g., ventricular tachycardia, junctional tachycardia.