The electrical axis of the heart is the net direction in which the wave of depolarization travels. It is measured using an electrocardiogram (ECG). Normally, this begins at the sinoatrial node (SA node); from here the wave of depolarisation travels down to the apex of the heart. The hexaxial reference system can be used to visualise the directions in which the depolarisation wave may travel.
On a hexaxial diagram (see figure 1):
If the electrical axis falls between the values of -30° and +90° this is considered normal.
If the electrical axis is between -30° and -90° this is considered left axis deviation.
If the electrical axis is between +90° and +180° this is considered right axis deviation (RAD).
RAD is an ECG finding that arises either as an anatomically normal variant or an indicator of underlying pathology.
and 30 Related for: Right axis deviation information
this is considered left axisdeviation. If the electrical axis is between +90° and +180° this is considered rightaxisdeviation (RAD). RAD is an ECG finding...
QRS axis between −30° and −90°, and rightaxisdeviation is defined as QRS axis greater than +90°, while extreme axisdeviation occurs when QRS axis is...
voltage. When left bundle-branch block (LBBB) is accompanied by rightaxisdeviation (RAD), the rare combination is considered to be highly suggestive...
may be diagnosed using one or more of the following ECG criteria: Rightaxisdeviation of more than (or equal to) 110° (see hexaxial reference figure) R-wave...
+105° is rightaxisdeviation and beyond −30° is left axisdeviation (the third quadrant of −90° to −180° is very rare and is an indeterminate axis). A shortcut...
A right bundle branch block (RBBB) is a heart block in the right bundle branch of the electrical conduction system. During a right bundle branch block...
and right bundle branch, leading to a rightaxisdeviation seen on the ECG. The American Heart Association has defined a LPFB as: Frontal plane axis between...
electrical axis in the frontal plane will be approximately +60°. Normal axis: -30° to +90° Left axisdeviation: -30° to -90° Rightaxisdeviation: +90° to...
sensitive to catecholamines. The ventricular beats typically have a rightaxisdeviation. Multiple morphologies of ventricular tachycardia may be present...
bundle branch being defective. It is manifested on the ECG by left axisdeviation. It is much more common than left posterior fascicular block. Normal...
of two ECG patterns: Right bundle branch block (RBBB) with left anterior fascicular block (LAFB), manifested as left axisdeviation (LAD). RBBB and left...
both. There are different types of heart failure: right-sided heart failure, which affects the right heart, left-sided heart failure, which affects the...
depression will be seen because they are the opposing leads of the cardiac axis. PR segment depression is highly suggestive of pericarditis. R wave in most...
120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex and may shift the heart's electrical axis slightly...
elevated in leads with negative QRS complexes. The axis may be normal but may be deviated to the left or right. There are also partial blocks of the left bundle...
rhythm Left bundle branch block Left anterior fascicular block Left axisdeviation Lev's disease (Lenegre-Lev syndrome) Long QT syndrome Lown–Ganong–Levine...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
systolic blood pressure, or Killip class of two or greater), ST-segment deviation, diabetes, serum creatinine, peripheral vascular disease, and elevation...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
Cardiology is concerned with the normal functionality of the heart and the deviation from a healthy heart. Many disorders involve the heart itself, but some...
anticoagulation), left and right atrial size (which predicts the likelihood that AF may become permanent), left ventricular size and function, peak right ventricular...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
morphology. Positive or negative concordance. Extreme Axisdeviation or NORTH WEST axis (axis between -90 and +180 degrees) Ventricular tachycardia can...
effect of digoxin Hypokalemia Right or left ventricular hypertrophy Intraventricular conduction abnormalities (e.g., right or left bundle branch block,...
electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line. It is seen in cardiac tamponade...
Sinoatrial arrest Other / ungrouped hexaxial reference system Rightaxisdeviation Left axisdeviation QT Short QT syndrome T T wave alternans ST J wave ST elevation...
Restriction site associated DNA markers, a type of genetic marker Rightaxisdeviation, a heart condition .rad file format, for Radiance (software) Rad...
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