Interactive worksheet
Occupational Noise – Cardiac Hypertension Index (ON-CHI) Calculator
Occupational Noise – Cardiac Hypertension Index (ON-CHI): Explanation and Clinical Context The ON-CHI is a conceptual tool that estimates the incremental hypertensive risk attributable to occupational noise exposure through a simple “risk-points” model integrating ambient noise level (LAeq,8h in dB(A)) and cumulative exposure duration (years). Chronic exposure to elevated occupational noise triggers sympathetic nervo