The mean time to onset of a 12% increase in FEV1 for PROVENTIL HFA Inhalation Aerosol was 7 minutes and the mean time to peak effect was approximately 50 minutes. The mean duration of effect as measured by a 12% increase in FEV1 was 2.3 hours. In some pediatric patients, duration of effect was as long as 6 hours.
The Aztecs, who probably originated as a nomadic tribe in northern Mexico, arrived in Mesoamerica around the beginning of the 13th century.
For Aztec society and culture, see Aztec. The Mexica Aztec Empire or the Triple Alliance (Nahuatl: ÄxcÄn TlahtÅlÅyÄn, [ËjeËÊkaËnÌ¥ ËjÃ©ËÊkaËnÌ¥]) tÍ¡É¬aÊtoËËloËjaËnÌ¥ tÍ¡É¬aÊtoËËlÃ³ËjaËnÌ¥ began as an alliance Of  three  nahua-altepetl: City-States, Mexico, tenochtitlan Texcoco. and tlacopanriginally, the Aztec empire was loose alliance between three cities: Tenochtitlan, Texcoco, and the most junior partner, Tlacopan. As such, they were known as the 'Triple Alliance.' This political form was very common in Mesoamerica, where alliances of city-states were ever fluctuating.