Guiding Inspiratory Flow: Development of the In-Check DIAL G16, a Tool for Improving Inhaler Technique

Table 2

Example third party dry powder inhaler resistance measures (k/L⋅min⁻¹).

DPI device	Inhaler resistance measures (k/L⋅min^−1) [Ref. number]
	[23]	[24]	[25]	[26]	[27]	[28]	[29]
Breezhaler (Neohaler)	0.02	0.0197				0.019	0.017
Clickhaler				0.0394
Diskhaler					0.032
Diskus (Accuhaler)		0.0275		0.0249	0.034	0.026	0.027
Ellipta		0.0275					0.027
Easyhaler				0.0424		0.037	0.050
Genuair (Pressair) [Novoliser]	0.031				[0.028]	0.029	0.031
HandiHaler		0.0510				0.05	0.058
Nexthaler	0.036				0.042	0.033	0.036
Spiromax (Respiclick)			0.0313
Turbuhaler Pulmicort		0.0382		0.0337	0.043	0.039	0.039
Turbuhaler Symbicort (Flexhaler)			0.0355			0.033	0.035
Twisthaler							0.044

Note. Resistances determined by one source may differ from another ( converted from cm H₂/L⋅min⁻¹, determined from Figure  2 in [28]).