Nitroglycerin compatibility with intravenous fluid filters, containers, and administration sets

Area of Science:

• Pharmacology
• Pharmaceutical Science
• Clinical Pharmacy

Background:

• Nitroglycerin is a critical vasodilator used in various cardiovascular conditions.
• Maintaining the stability and potency of intravenous nitroglycerin is essential for effective patient treatment.
• Potential drug loss during intravenous administration can impact therapeutic outcomes.

Purpose of the Study:

• To investigate the impact of common intravenous administration components on nitroglycerin concentration.
• To quantify drug loss associated with filters, containers, and administration sets.
• To identify factors influencing nitroglycerin degradation during intravenous delivery.

Main Methods:

• Nitroglycerin solutions (50 and 100 microgram/ml) were prepared in different vehicles (water for injection, 5% dextrose, 0.9% sodium chloride).
• Concentrations were measured after exposure to 0.2-micron filters, storage in glass and plastic containers, and passage through eight types of intravenous administration sets.
• Variables such as surface area, temperature, drip rate, and tubing material were considered.

Main Results:

• Filtration caused nitroglycerin concentration decreases ranging from 2% to 55%.
• Storage in glass containers did not affect concentration, while plastic bags showed substantial, temperature- and surface-area-dependent losses.
• Intravenous administration sets led to immediate and significant reductions in concentration, influenced by drip rate, contact time, and material.

Conclusions:

• Intravenous filters, plastic containers, and administration sets can substantially reduce nitroglycerin potency.
• Combined effects suggest potential concentration reductions of up to 80% under typical administration conditions.
• Clinical practices should account for these losses to ensure accurate nitroglycerin dosing.