Measuring respiratory rateSir I read with interest the letter about respiratory rate from Clancy & Williams in Archives of Emergency Medicine 8(3).I have been using the Simonsen system for measuring respiratory rate (RR) for the past 18 months, and have found the measure- ment of RR by using changes in transthoracic impedance between two ECG leads much simpler and more reliable than alternative systems (such as end-tidal CO2 measurement or direct pressure measurement from nasal cannulae).It is generally
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D Haborne (1992) studied this question.
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