By Francis Morris, William J. Brady, Visit Amazon's A. John Camm Page, search results, Learn about Author Central, A. John Camm,
(BMJ Books) Quick-reference textual content permits readers to get to grips with the big variety of electrocardiogram styles visible in medical perform. For these regularly perform or in hospitals coping with sufferers with middle problems. Softcover.
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Extra info for ABC of Clinical Electrocardiography
Resolution of changes in ST segment and T waves As the infarct evolves, the ST segment elevation diminishes and the T waves begin to invert. The ST segment elevation associated with an inferior myocardial infarction may take up to two weeks to resolve. ST segment elevation associated with anterior myocardial infarction may persist for even longer, and if a left ventricular aneurysm develops it may persist indefinitely. T wave inversion may also persist for many months and occasionally remains as a permanent sign of infarction.
Electrocardiographic differences Direct evidence of independent P wave activity is highly suggestive of ventricular tachycardia, as is the presence of fusion beats or captured beats. 14 s generally indicate a ventricular origin. Concordance throughout the chest leads also indicates ventricular tachycardia. Danger of misdiagnosis x The safest option is to regard a broad complex tachycardia of uncertain origin as ventricular tachycardia unless good evidence suggests a supraventricular origin x If a ventricular tachycardia is wrongly treated as supraventricular tachycardia, the consequences may be extremely serious x Giving verapamil to a patient with ventricular tachycardia may result in hypotension, acceleration of the tachycardia, and death In ventricular tachycardia the rhythm is regular or almost regular; if the rhythm is obviously irregular the most likely diagnosis is atrial fibrillation with either aberrant conduction or pre-excitation 27 ABC of Clinical Electrocardiography A previous electrocardiogram may give valuable information.
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 Francis Morris, William J. Brady, Visit Amazon's A. John Camm Page, search results, Learn about Author Central, A. John Camm,