4. chest leads : six chest lead positions are defined by international agreement (a).

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<p>One part of a larger set of data cards issued by Ciba showing the standard positions for ECG chest leads. Overleaf, it reads 'The cards in this series are, Normal ECG, Limb Leads, Chest Leads, Left and Right Ventricular Hypertrophy, Myocardial Infarction, Ectopic Beats. All reproductions are from actual tracings.'</p>

4. chest leads : Ismelin : the established treatment for hypertension.

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