By John R. Hampton

The ECG in perform is a clinically-orientated publication exhibiting how the electrocardiogram is used to assist diagnosing sufferers with heart problems. each one bankruptcy starts with a quick attention of the historical past and exam of the sufferer to aid the health care provider plan how one can use the ECG within the such a lot clever and ecocnomic method.

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She had no other symptoms but was anxious. There were no other abnormalities on examination, and her blood count and thyroid function tests were normal. 51 THE ECG IN HEALTHY PEOPLE Fig.

The AV node and surrounding tissue), Junctional tachycardias are most accurately called AV nodal re-entry' (AVNRE) tachycardias. However, the terms 'Junctional tachycardia' and 'SVT' seem likely to persist in common usage. Broad complex tachycardias If a tachycardia shows a broad QRS complex, there are three possible causes: • a supraventricular tachycardia with bundle branch block: here the mechanism of the tachycardia is that of the supraventricular rhythm, but conduction into the ventricles occurs through one bundle branch only CAUSES OF ARRHYTHMIAS • re-entry tachycardia associated with the WPW syndrome • ventricular tachycardia: here the arrhythmia may be due to re-entry through circuits within the Purkinje system, or may result from enhanced automaticity.

The term 'dysrhythmia' - which means essentially the same thing - has been dropped. Properly speaking, conduction disorders are not arrhythmias. Disorders of the sinoatrial node 'Sinus arrhythmia' is really a contradiction in terms because sinus rhythm is not an arrhythmia. The frequency of depolarization of the SA node is affected by the vagus nerve, and inspiration and expiration cause its rate of discharge to increase and decrease respectively. The normal heart is thus a little irregular - hence 'arrhythmia' (Fig.

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