Background: the optimal period over which respiratory rate should be measured is uncertain.
Setting: medical ward of low resource Ugandan hospital,
Methods: comparison of the first respiratory rates measured on admission over seconds using a smartphone application with measurements over 15 minutes using a piezoelectric device.
Results: There was a poor correlation between respiratory rates measured by the piezoelectric device and rates measured by a smartphone application. Although the discrimination for mortality of piezoelectric respiratory rates were slightly higher than those derived from the application, there were not statistically significant differences.
Conclusion: this study could not demonstrate potential clinical benefits that justify measuring the first respiratory rate after admission over 15 minutes by a device.
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