Back Blows and Choking

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Abstract
In Reply.— Day and colleagues1 at tye Yale University School of Medicine reported studies proving that back blows propel a foreign body downward and backward into the throat or larynx in a direction toward the lung at a force of 3 g. Day et attributed this finding to Newton's Third Law of Motion: "To every action there is always opposed an equal reaction." They conclude that, in a choking person, "in the case of a partial obstruction, a back blow could transform the situation into one of compleete blockage."

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