The impact of large tidal volume ventilation on the absorption of inhaled insulin in rabbits.

• Previous studies have shown that ventilation patterns affect absorption of inhaled compounds. Thus, the aim of this study was to investigate the effect of large tidal volume ventilation (LTVV) on the absorption of inhaled insulin in rabbits. Mechanically ventilated rabbits were given human insulin via a nebuliser system, and plasma insulin was measured for the following 120 min. Ventilation was adjusted to (1) normal tidal volume ventilation (NTVV) for the entire period after dosing (NTVV group), to (2) LTVV for the entire period after dosing (LTVV group), to (3) NTVV except for 15 min LTVV immediately after dosing (Early LTVV group), or to (4) NTVV except for 15 min LTVV starting at 60 min after dosing (late LTVV group). Insulin absorption (AUC(ins(0-120min))) was increased by 149% for the LTVV group compared to NTVV group (p < 0.01) with increased maximal insulin concentration (106%, p = 0.03). The Early LTVV group showed a changed absorption profile. For the late LTVV group an increase in insulin levels was observed after the LTVV period (not significant compared to the NTVV group). These data could potentially have implications for patients using inhaled insulin in situations where a change in breathing pattern is seen, such as exercise.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine (hsv//eng)

Keyword

lung

insulin

administration

inhalation

animals

rabbits

pharmacokinetics

absorption

Publication and Content Type

art (subject category)

ref (subject category)