By David Kerr, Annie Young, Richard Hobbs
(BMJ Books) Univ. of Birmingham, united kingdom. Covers key parts of sufferer care and gives debate round the a number of uncertanties in regards to the illness. colour illustrations. Softcover.
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Additional resources for ABC of Clinical Electrocardiography
Myocardial ischaemia may also give rise to T wave inversion, but it must be remembered that inverted T waves are normal in leads III, aVR, and V1 in association with a predominantly negative QRS complex. T waves that are deep and symmetrically inverted (arrowhead) strongly suggest myocardial ischaemia. V1 V4 V2 V5 V3 V6 Suggested criteria for size of T wave x 1/8 size of the R wave x < 2/3 size of the R wave x Height < 10 mm T wave inversion x T wave inversion can be normal x It occurs in leads III, aVR, and V1 (and in V2, but only in association with T wave inversion in lead V1) V1 V4 V2 V5 V3 V6 Arrowhead T wave inversion in patient with unstable angina In some patients with partial thickness ischaemia the T waves show a biphasic pattern.
Full cardiopulmonary resuscitation facilities must be available, and test supervisors must be trained in cardiopulmonary resuscitation. Limitations The specificity of ST segment depression as the main indicator of myocardial ischaemia is limited. ST segment depression has been estimated to occur in up to 20% of normal individuals on ambulatory electrocardiographic monitoring. There are many causes of ST segment changes apart from coronary artery disease, which confound the result of exercise testing.
26 Atrial flutter with left bundle branch block, giving rise to broad complex tachycardia The Wolff-Parkinson-White syndrome is discussed in more detail in an earlier article, on junctional tachycardias Broad complex tachycardia—Part II Antidromic atrioventricular re-entrant tachycardia In this relatively uncommon tachycardia the impulse is conducted from the atria to the ventricles via the accessory pathway. The resulting tachycardia has broad, bizarre QRS complexes. Atrial fibrillation In patients without an accessory pathway the atrioventricular node protects the ventricles from the rapid atrial activity that occurs during atrial fibrillation.
ABC of Clinical Electrocardiography by David Kerr, Annie Young, Richard Hobbs