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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
View All. The apnea-hypopnea index, or AHI, is an index used to assess the severity of sleep apnea based on the total number of complete cessations (apnea) and partial obstructions (hypopnea) of breathing occurring per hour of sleep. By definition, these pauses in breathing must last for at least 10 seconds.