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LVH (left ventricular hypertrophy) is represented by classic EKG findings, namely that the sum of V1Q and V5R > 35 mm (ie: a very deep Q wave in V1 and a very tall R wave in V5). Further, you will expect to find left axis deviation as represented by tall R waves in both lead II and aVL. LVH is one of many conditions (including bundle branch blocks) that can also have repolarization abnormalities. Simply put, a repolarization abnormality is shown on EKG with a T wave going the opposite direction as the main direction of the QRS. Recall, normally these will be in the same direction despite the fact that the QRS is ventricular depolarization and the T wave is ventricular repolarization, because they occur in opposite directions.
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Atrial repolarization coincides in time with?
the ventricular depolarization, which masks the atrial repolarization wave on the electrocardiogram. This is because the QRS complex is much larger than the atrial repolarization wave and overlaps with it, making it difficult to distinguish on the ECG.
The process of depolarization and repolarization is called?
The process of depolarization and repolarization is called an action potential. During depolarization, the cell's membrane potential becomes more positive, while during repolarization, the membrane potential returns to its resting state.
What is the stage in an action potential that immediately follow depolarisation?
The stage that immediately follows depolarization in an action potential is repolarization. During repolarization, potassium ions move out of the cell, causing the membrane potential to return to its resting state.
What is repolarization of the sarcolemma?
Repolarization of the sarcolemma refers to the process of restoring the electrical charge across the muscle cell membrane following depolarization. It involves the movement of potassium ions out of the cell, returning the membrane potential to its resting state. This repolarization phase is critical for the muscle cell to prepare for its next contraction.
Why is the ECG event indicating atrial repolarization not seen in an ECG?
The atrial repolarization event is usually hidden by the larger QRS complex in the ECG, making it difficult to distinguish. The electrical activity from the atrial repolarization is masked by the ventricular depolarization signals.
What does a long QT interval on ECG mean?
It is a lengthening of the amount of time between depolarization of the ventricles of the heart, and the repolarization of the ventricles of the heart. The significance of this lies in the fact that the Q-T interval is a vulnerable time for the heart. Stimulation of the heart muscle during the relative refractory period (which is during the latter part of the Q-T interval) will cause a premature ventricular contraction, which may throw your heart into a dangerous dysrhythmia.
What does the medical abbreviation LVH mean?
Left Ventricular Hypertrophy
Repolarization of a ventricular cardiocyte taks longer then repolarization of a typical neuron?
yes
What is the portion of the ECG that indicates ventricular repolarization?
The wave indicating atrial repolarization wave is hidden by the QRS complex. Ventricular repolarization is indicated by the T wave.
Atrial repolarization coincides in time with?
the ventricular depolarization, which masks the atrial repolarization wave on the electrocardiogram. This is because the QRS complex is much larger than the atrial repolarization wave and overlaps with it, making it difficult to distinguish on the ECG.
What is atrial repolarization indicated by?
The atrial repolarization occurs during the QRS complex of the ECG but is obscured by the ventricle depolarization.
What does precordial repolarization disturbance mean?
Precordial repolarization disturbance is a heart condition that can be determined though an EKG. Precordial has to do with the area above your heart and repolarization has to do with the heart muscle preparing itself for it's next beat.
What is minimal voltage criteria for LVH may be normal variant?
Pulmonary disease pattern
What does the t wave represent on an ecg?
It represents the repolorization of the ventricles. The ventricles must reset electrically after contracting. In a normal Sinus Rhythm the p wave comes first. Then the QRS complex which is the largest part of the heartbeat will come less than .2 seconds later. The QRS complex usually lasts less than .12 seconds. The final bump is (usually) the T wave.
What does ventricular repolarization result in?
contraction
What channels are open during depolarization and during repolarization?
During depolarization Na channels are open During repolarization K channels are open
The process of depolarization and repolarization is called?
The process of depolarization and repolarization is called an action potential. During depolarization, the cell's membrane potential becomes more positive, while during repolarization, the membrane potential returns to its resting state.
