the effects on airways in the whole animal. However, these efforts are often ffawed by an
overinterpretation of the functional measurements that rely on the empiric
variable,“enhanced pause” or Penh, which has been shown to be primarily related to
ventilatory timing and unrelated to airway resistance (1–3). We are quite concerned about
the increasingly widespread (over 30 articles) and often uncritical applications of the Penh …