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The last half of the T wave is referred to as the relative refractory period or vulnerable period. The T wave contains more information than the QT interval. The T wave can be described by its symmetry, skewness, slope of ascending and descending limbs, amplitude and subintervals like the T peak –T end interval. [1] In most leads, the T wave ...
A mnemonic can be used for some causes of ST depression, namely DEPRESSED ST: [citation needed]. D - Drooping valve (mitral valve prolapse) E - Enlargement of the left ventricle P - Potassium loss R - Reciprocal ST depression (e.g. inferior wall MI) E - Encephalon hemorrhage S - Subendocardial infarct S - Subendocardial ischemia E - Embolism (pulmonary) D - Dilated cardiomyopathy S - Shock T ...
The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°.
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 ...
ST-T Abnormalities: ST-T vector opposite to QRS without digitalis; ST-T vector opposite to QRS with digitalis; 3 1 Negative terminal P mode in V 1 1 mm in depth and 0.04 sec in duration (indicates left atrial enlargement) 3 Left axis deviation (QRS of −30° or more) 2 QRS duration ≥0.09 sec 1 Delayed intrinsicoid deflection in V 5 or V 6 ...
Unspecified or other types of bipolar disorder are when a patient doesn’t meet the criteria specified above but still sees the periods of abnormal mood elevation characteristic of bipolar disorders.
There must be a prolonged S wave in leads I and V 6 (sometimes referred to as a "slurred" S wave). The T wave should be deflected opposite the terminal deflection of the QRS complex. This is known as appropriate T wave discordance with bundle branch block. A concordant T wave may suggest ischemia or myocardial infarction. [citation needed]
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