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Oxygen breathing may lower resting cardiac index; leaves open relevance to modern hyperoxia protocols.
known quantity of dye + 0.05 mg. All injections were made during the end-expiratory phase of respiration. A Harvard withdrawal pump was used to draw blood through a Waters XP-100A densitometer from the brachial arterial needle at a rate of 19.4 ml per minute.
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Daly et al. (1962) studied this question.
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