What does ventricular depolarization cause?
Ventricular depolarization occurs in part via an accessory pathway (AP) directly connecting the atrium and ventricle and thus capable of conducting electrical impulses into the ventricle bypassing the AV-His Purkinje conduction system.
Which wave is ventricular repolarization?
the T wave
Ventricular repolarization is a complex electrical phenomenon which represents a crucial stage in electrical cardiac activity. It is expressed on the surface electrocardiogram by the interval between the start of the QRS complex and the end of the T wave or U wave (QT).
What is the T wave do?
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 does the Q wave represent?
INTRODUCTION. By definition, a Q wave on the electrocardiogram (ECG) is an initially negative deflection of the QRS complex. Technically, a Q wave indicates that the net direction of early ventricular depolarization (QRS) electrical forces projects toward the negative pole of the lead axis in question.
What causes QRS wave?
The QRS complex represents the electrical impulse as it spreads through the ventricles and indicates ventricular depolarization. As with the P wave, the QRS complex starts just before ventricular contraction.
What does the S wave represent?
the S wave signifies the final depolarization of the ventricles, at the base of the heart.
What happens in the P wave?
The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.
What is the R wave?
The R wave is the first upward deflection after the P wave. The R wave represents early ventricular depolarisation.
What generates the R wave?
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.
What causes the R wave?
The causes for a R/S wave ratio greater than 1 in lead V1 include right bundle branch block, Wolff-Parkinson-White syndrome, an acute posterior myocardial infarction, right ventricular hypertrophy and isolated posterior wall hypertrophy, which can occur in Duchenne muscular dystrophy.
Which wave represents ventricular repolarization?
– The hyperacute phase of myocardial infarction – Prinzmetal angina – Normal variant – Hyperkalemia – Left ventricular hypertrophy – Left bundle branch block – Acute pericarditis
What happens during ventricular repolarization?
What is wave represents the ventricular re-polarization?
Introduction. The T wave on the ECG (T-ECG) represents repolarization of the ventricular myocardium.
What does ventricular repolarization result in?
Ventricular repolarization and contractile function are frequently abnormal in ventricular myocytes from human failing hearts as well as canine hearts with experimentally induced heart failure (HF). These abnormalities have been attributed to dysfunction involving various steps of the excitation-contraction coupling process, leading to impaired intracellular sodium and calcium homeostasis.