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 variety of uncertanties in regards to the illness. colour illustrations. Softcover.
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Extra resources for ABC of Clinical Electrocardiography
14 s). Consequently, this arrhythmia is commonly misdiagnosed as a supraventricular tachycardia. The QRS complexes have a right bundle branch block pattern, often with a small Q wave rather than primary R wave in lead V1 and a deep S wave in lead V6. When the tachycardia originates from the posterior fascicle the frontal plane axis of the QRS complex is deviated to the left; when it originates from the anterior fascicle, right axis deviation is seen. Right ventricular outflow tract tachycardia This tachycardia originates from the right ventricular outflow tract, and the impulse spreads inferiorly.
In some patients the atrioventricular node allows retrograde conduction of ventricular impulses to the atria. The resulting P waves are inverted and occur after the QRS complex, usually with a constant RP interval. It is important to scrutinise the tracings from all 12 leads of the electrocardiogram, as P waves may be evident in some leads but not in others Capture beat Fusion beat Concordance can be either positive or negative ABC of Clinical Electrocardiography Positive concordance probably indicates that the origin of the tachycardia lies on the posterior ventricular wall; the wave of depolarisation moves towards all the chest leads and produces positive complexes.
A C Subtle ST segment change in patient with ischaemic chest pain: when no pain is present (top) and when in pain (bottom) 38 B D ST changes with ischaemia showing normal wave form (A); flattening of ST segment (B), making T wave more obvious; horizontal (planar) ST segment depression (C); and downsloping ST segment depression (D) Substantial ST segment depression in patient with ischaemic chest pain Myocardial ischaemia More obvious changes comprise ST segment depression that is usually planar (horizontal) or downsloping.
ABC of Clinical Electrocardiography by David Kerr, Annie Young, Richard Hobbs