Valved holding chambers (VHCs) for use with pressurised metered-dose inhalers (pMDIs): a review of causes of inconsistent medication delivery.

@article{Mitchell2007ValvedHC,
  title={Valved holding chambers (VHCs) for use with pressurised metered-dose inhalers (pMDIs): a review of causes of inconsistent medication delivery.},
  author={Jolyon P. Mitchell and Mark Nagel},
  journal={Primary care respiratory journal : journal of the General Practice Airways Group},
  year={2007},
  volume={16 4},
  pages={207-14}
}
BACKGROUND Valved holding chambers (VHCs) are prescribed with pressurised metered dose inhalers (pMDIs) to improve medication delivery for the treatment of respiratory diseases because they reduce the need for the patient to co-ordinate inhaler actuation with the onset of inhalation. Although mechanically robust and clinically effective if properly designed and pre-conditioned, there are several causes of inconsistent medication delivery if this is not the case. These include: electrostatic… CONTINUE READING
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