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Change in heart rate after atropine sulfate delivery using the MicroDose Therapeutx dry powder inhaler (DPIA: nominal dose 2 mg, output dose 1.95 mg; n=16) and the AtroPen Auto-Injector (AUTO: 2 mg IM; n=17). Values are means±SD. The DPIA dose was delivered in five inhalations over 12 min.
