Propyl ether. II. Pulmonary irritation and anaesthesia

Area of Science:

• Toxicology
• Occupational Health
• Respiratory Physiology

Background:

• Previous research (Nielsen et al. 1985) identified sensory irritation responses to ether.
• Following sensory irritation, mixed pulmonary and anesthetic responses were observed.

Purpose of the Study:

• To determine the threshold limit value (TLV) for ether exposure based on pulmonary irritation and anesthesia.
• To investigate the relationship between decreased respiratory rate and tidal volume.
• To assess the impact of technical grade ether impurities on observed responses.

Main Methods:

• Exposure of subjects to technical grade ether for four hours.
• Monitoring respiratory rate and tidal volume during exposure.
• Calculating thresholds for pulmonary irritation and anesthesia.
• Analyzing the correlation between respiratory rate and tidal volume.

Main Results:

• A decrease in respiratory rate and tidal volume was observed, indicating pulmonary irritation and anesthesia.
• Thresholds for pulmonary irritation and anesthesia were determined as 1490 p.p.m. and 1280 p.p.m., respectively.
• Respiratory minute volume decrease was approximated from respiratory frequency.
• No significant influence of ether impurities on the observed responses was found.

Conclusions:

• A threshold limit value (TLV) of approximately 100 p.p.m. is proposed for ether, considering both pulmonary irritation and anesthesia.
• The findings suggest a clear dose-response relationship for ether's respiratory effects.
• Technical grade ether can be used without concern for impurity-related exacerbation of respiratory effects.