In vitro evaluation of aerosol delivery of aztreonam lysine (AZLI): an adult mechanical ventilation model

Expert Opin Drug Deliv. 2017 Dec;14(12):1447-1453. doi: 10.1080/17425247.2017.1393411. Epub 2017 Oct 23.


Background: The delivery profile of Aztreonam lysine (AZLI) during mechanical ventilation (MV) is unknown. We evaluated the amount of AZLI drug delivered using an in vitro model of adult MV.

Methods: An adult lung model designed to mimic current clinical practice was used. Both nebulizers were placed before a Y-piece and 4 settings were tested: A) Aeroneb solo® [AS] with a t-piece; B) AS with the spacer; C) M-Neb® [MN] with a t-piece and D) MN with the spacer. Performance was evaluated in terms of: 1) Mass median aerodynamic diameter (MMAD); 2) Geometric standard deviation (GSD), 3) Fine particle dose (FPD), 4) Fine particle fraction (FPF), 5) Inhalable mass (IM), and 6) Recovery rate (RR).

Results: Both devices showed an adequate delivery of AZLI during MV, with MMAD between 2.4-2.5 µm and 87% of FPF. The FPD (38.8 and 31.7), IM (44.8 and 36.1) and RR (30 and 24) were similar for AS and MN respectively. Nebulizer aerosol delivery increased (50 and 70% respectively) for both nebulizers when using the spacer.

Conclusion: Both AS and MN showed a good aerosol delivery profile for AZLI during in vitro mechanical ventilation. Better aerosol delivery performance was obtained using the spacer.

Keywords: Aztreonam lysine; aerosol delivery; in vitro model; mechanical ventilation; nebulized antibiotic.

MeSH terms

  • Administration, Inhalation
  • Aerosols
  • Aztreonam / administration & dosage*
  • Equipment Design
  • Humans
  • Models, Anatomic
  • Particle Size
  • Respiration, Artificial*


  • Aerosols
  • Aztreonam