ST-T changes in PVCs, ventricular arrhythmias, and ventricular paced beats.ST-T changes seen in bundle branch blocks (generally the ST-T polarity is opposite to the major or terminal deflection of the QRS)."Secondary" ST-T Wave changes (these are normal ST-T wave changes solely due to alterations in the sequence of ventricular activation): Ventricular conduction abnormalities and rhythms originating in the ventricles.Atrial repolarization (e.g., at fast heart rates the atrial T wave may pull down the beginning of the ST segment).Metabolic factors (e.g., hypoglycemia, hyperventilation).Neurogenic factors (e.g., stroke, hemorrhage, trauma, tumor, etc.).Electrolyte abnormalities of potassium, magnesium, calcium.Drugs (e.g., digoxin, quinidine, tricyclics, and many others).Intrinsic myocardial disease (e.g., myocarditis, ischemia, infarction, infiltrative or myopathic processes).Patient to ascertain the importance of the ECG findings.įactors affecting the ST-T and U wave configuration include: Thisĭoes not mean that the ECG changes are unimportant! It is the responsibility of the clinician providing care for the Thus the term, nonspecific ST-T waveĪbnormalities, is frequently used when the clinical data are not available to correlate with the ECG findings. In which the ECG changes are found than by the particular changes themselves. General Introduction to ST, T, and U wave abnormalitiesīasic Concept: the specificity of ST-T and U wave abnormalities is provided more by the clinical circumstances General Introduction to ST-T and U Wave Abnormalities.
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