Cross-sectional study of pulmonary function in cadmium alloy workers

Area of Science:

• Occupational Health
• Environmental Toxicology
• Pulmonary Medicine

Background:

• Cadmium (Cd) is a toxic heavy metal with known adverse effects on human health.
• Occupational exposure to cadmium can occur in various industrial settings.
• Understanding the specific pulmonary effects of chronic cadmium exposure is crucial for worker protection.

Purpose of the Study:

• To investigate the pulmonary effects of chronic cadmium exposure in Japanese workers.
• To assess the relationship between cadmium exposure levels and lung function parameters.
• To determine if cadmium exposure induces chronic obstructive pulmonary changes.

Main Methods:

• Studied two groups of cadmium-exposed workers (high and slight exposure) and a reference group.
• Measured pulmonary function using forced expiratory flow volume curves and respiratory impedance.
• Assessed cadmium levels in blood and urine, and estimated inhalation exposure.
• Evaluated renal tubular reabsorption functions in exposed workers.

Main Results:

• Highly exposed workers showed significant deterioration in forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1.0), peak expiratory flow, and respiratory impedance.
• Slightly exposed workers exhibited reduced FVC and FEV1.0 compared to referents.
• Blood cadmium levels averaged 2.08 µg/100 ml and urinary levels 32.6 µg/l in exposed groups.
• Inhalation exposure in the high-exposure group was estimated at approximately 1 mg/m³ (8-h average).

Conclusions:

• Chronic cadmium exposure induces obstructive pulmonary changes in workers.
• Pulmonary function impairment is dose-dependent, affecting multiple respiratory parameters.
• These findings highlight the risk of cadmium-induced lung disease even without acute pneumonitis.