The Effect of a Single Inspiration in Lead Iii and a Precordial Lead of the Human Electrocardiogram

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Respiratory phase may confound lead III and precordial ECG interpretation; leaves open need for standardized breath-hold protocols in practice.

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NORRIS et al. (1951) studied this question.

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Respiratory phase may confound lead III and precordial ECG interpretation; leaves open need for standardized breath-hold protocols in practice.