CM11.{1,3-4} | CM11.{1,3-4} | Occupational Illness, Hazards and Ergonomics — Summary & Reflection

KEY TAKEAWAYS

This module covered three competencies in occupational health at the Year-3 CM level:

Occupational illness and presenting features (CM11.1): Pneumoconioses (silicosis — upper-zone nodules, eggshell calcification, TB risk; asbestosis — lower-zone fibrosis, mesothelioma risk; CWP — coal miners, PMF; byssinosis — cotton dust, Monday morning pattern); metal toxicity (lead: wrist-drop, colic, basophilic stippling, Burton's line; mercury: erethism, tremor, gingivitis); organophosphate poisoning in agriculture (SLUD, miosis, cholinesterase inhibition — treat with atropine + pralidoxime).

Occupational hazards and prevention (CM11.3): Five hazard categories (physical, chemical, biological, ergonomic, psychosocial). Hierarchy of controls in decreasing effectiveness: elimination → substitution → engineering controls → administrative controls → PPE. Environmental and biological monitoring; pre-employment/periodic medical surveillance; notification under Factories Act 1948 (Schedule III — 29 notifiable occupational diseases).

Ergonomics (CM11.4): Fit the job to the worker; man-machine-environment interface. Key risk factors: repetition, awkward posture, force, vibration, static loading. Assessment tools: RULA (upper limb, scores 1–7), NIOSH Lifting Equation (RWL, Lifting Index >1 = risk), OWAS. Workstation design principles prevent carpal tunnel syndrome, cervical spondylosis, and low back pain.

Clinical application: structured occupational history (7 questions); temporal relationship between work and symptoms; notification and compensation under ESI Act and Employees' Compensation Act.

REFLECT

You are posted as a medical officer at a rural primary health centre adjacent to a granite quarrying district. Three male labourers in their 30s and 40s have attended your clinic in the past month — all with progressive breathlessness and chronic cough, all having worked in the quarry for over a decade. None has been referred for investigation. The quarry owner says there is no health problem at the site.

Reflect on the following:
1. What is the most likely unifying occupational diagnosis, and what specific investigations would you request to confirm it?
2. What is your responsibility under the Factories Act 1948 regarding notification?
3. The quarry employs 80 workers. What public health actions would you initiate beyond treating these three patients?
4. What barriers do you anticipate in pursuing occupational justice for unorganised-sector workers in a rural setting, and how would you address them?

Think through these questions before your next clinical posting. Occupational medicine is not a subspecialty — it begins in every clinic room where you take a history.