Harmful and hazardous occupational factors

Pathologies and tasks of occupational medicine

The impact of an unfavorable working environment manifests in two forms. First, it is the development of true occupational diseases. Second, it is the exacerbation of general illnesses that are not directly related to production. A separate category is work-related pathology — conditions in which labor acts as a provoking factor, but for an accurate diagnosis, the physician must exclude the influence of the patient's genetics, ecology, and lifestyle habits.

The study of these processes is the domain of occupational medicine. Its main goal is to develop effective preventive measures. The baseline regulatory and methodological document in this area is the guideline R 2.2.2006-05, which defines the criteria for assessing the working environment.

Hygienic classification of working conditions

The degree of occupational hazard depends on the severity of the labor process (e.g., forced working posture or neuropsychic strain) and the deviation of environmental parameters from hygienic standards. According to the 1986 classification, there are three main classes:

• Class I (optimal): Ideal environment. Adverse effects are excluded, creating prerequisites for maintaining high work capacity.
• Class II (permissible): The level of harmful factors does not exceed standards. The body may experience functional changes, but they completely disappear during regulated (shift-time) or home rest. There is no negative impact on the health of the worker and their offspring.
• Class III (harmful and hazardous): Sanitary standards are violated. Environmental factors and psychophysiological loads lead to a persistent decrease in work capacity and health disorders.

Within Class III, three degrees of severity are distinguished:

1. Degree 1: Functional shifts are reversible if the problem is identified in time and contact with the factor is ceased.
2. Degree 2: Disorders become persistent. Morbidity with temporary disability increases, and mild forms of occupational diseases may appear.
3. Degree 3: Characterized by an increased risk of developing severe occupational pathologies.

Principles of prevention in the workplace

It is important to understand the key principle: occupational hazards and diseases are not inevitable companions of a profession. Prolonged and systematic exposure to negative factors can be neutralized.

Main areas of protection:

• Production mechanization and proper labor organization.
• Availability of well-equipped facilities and strict adherence to safety engineering.
• Provision of personal and collective protective equipment.
• Implementation of a correct regimen: regular breaks every hour, change of activity (alternation of operations), occupational calisthenics for the spine and hands.
• Biomedical prevention: additional intake of vitamin B1 and local hydrotherapy procedures.

Specific factors: infrasound and catering units

Examples of the diversity of occupational factors include physical and biological threats.

Infrasound represents sound oscillations with a frequency below 20 Hz (measured in decibels in octave bands of 2, 4, 8, and 16 Hz). Humans cannot hear them, but they possess specific hygienic properties. Infrasound is poorly absorbed by the medium, effectively bypasses obstacles (pronounced diffraction), and propagates over vast distances where sound energy drops to zero while sound pressure persists. The main danger is the ability to cause resonance and induce vibration of large objects. Sources can be both natural (storms, earthquakes) and anthropogenic (powerful engines).

Biological and sanitary risks in healthcare catering units are associated with the specifics of clinical nutrition. Preparing dietary meals requires frequent grinding and puréeing of raw materials. This manifoldly increases the surface area of food contact with the external environment, creating a high risk of pathogen multiplication. To prevent contamination, strict process flow is required (ready food must not come into contact with raw materials), wall tiling up to a height of at least 1.7 m, floor slopes toward drainage traps, and thorough cleaning of mechanization equipment.

Class and exam questions

What else to study on this topic

• Regulatory and methodological framework (R 2.2.2006-05) and working environment assessment criteria
• Physical characteristics of infrasound and mechanisms of its ultra-long-range propagation
• Sanitary and hygienic requirements for the layout and engineering systems of the catering unit
• Biomedical prevention in the workplace (hydrotherapy, vitaminization)
• Natural and anthropogenic sources of infrasonic oscillations

Other topics in "Chapter 6. Fundamentals of Occupational Hygiene and Physiology"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.