Direct writeout of total respiratory resistance.

The effect of adrenergic and cholinergic drugs on methacholine- and histamine-induced bronchoconstriction in monkeys.

“…The airway pressure, airflow and integrated airflow (tidal volume), and ECG were recorded by a magnetic tape-recorder (Sony RMG-5104, Tokyo) and simultaneously monitored on a four-channel direct-writing recorder (Sanei oscillograph 8L-12, Tokyo). The taped data were played back and the collected total respiratory impedance was calculated into the total Rrs by an analogue circuit according to Hyatt and his coworkers' formula (Hyatt et al 1970). …”

Assessing change in airway calibre‐measurement of airway resistance.

“…The coefficient of variation calculated from up to 55 measurements of sGaw for each of 3 normal subjects studied in the body plethysmograph over several months gave values between 12% and 17%. Studies over 5 days using the forced oscillation technique gave a mean coefficient of variation for total respiratory resistance of 8% which was identical to that seen throughout the day (Hyatt, Zimmerman, Peters & Sullivan, 1970). Both studies also carried out measurements of day to day changes in patients with airway obstruction but these will obviously be greatly influenced by patient selection.…”

The participation of the subepithelial airway receptor in the bronchoconstriction of monkeys.

“…The airway pressure, airflow, integrated airflow (tidal volume), and ECG were recorded with a magnetic tape-recorder (Sony RMG-5104, Tokyo) and simultaneously monitered on a 4-channel direct-writing recorder (Sanei oscillograph 8L-12, Tokyo). The collected total respiratory impedance was instantaneously calculated into the total respiratory resistance (Rrs) by an analogue circuit computer according to the formula of Hyatt et al (1970).…”