Standards Development

Scope

Specifies particular requirements for systems for the supply of nitric oxide/nitrogen mixtures from cylinders to one patient at a time. It pays particular attention to:

-continuity of supply

- suitability of material

-gas specificity and

- cleanliness

Purpose

Nitric oxide for inhalation (NO) is regarded as a relatively new medicinal product for use in investigation and treatment of patients on a compassionate basis. Endogenous nitric oxide seems to be involved in the control and action of a great number of organ functions, including platelet aggregation, neurotransmission, and antitumour and antimicrobial activity, and not only in the control of vascular tone.

Nitric oxide in nitrogen is supplied as a ready to use mixture intended to be administered to patients together with oxygen using a suitable supply and delivery system. In this document concentrations of nitric oxide/nitrogen are given as ‘[less than or equal to] 1000 [micro]l/l’ (words used because symbols were not accepted).

It is therefore essential to use equipment suitable for such small doses and an international standard would help achieve that aim.

CEN TC215 produced a guidance document CEN CR 13903 in 2000 followed by two technical Specifications CEN TS 14507 parts 1 and 2 for delivery systems and supply systems respectively published in 2003. As these systems are still in use CEN TC215 decided to offer these Technical Reports to ISO TC121 to update and develop as International Standards.