Occupational Illnesses and Disorders Notes

Occupational Illnesses and Disorders

Types of Occupational Illnesses

  1. Musculoskeletal Disorders
    Musculoskeletal disorders (MSDs) rank as the most frequently reported occupational disorders. They encompass both acute and chronic injuries that affect muscles, tendons, ligaments, nerves, joints, bones, and supporting vascular tissues. Such conditions can manifest from repetitive motion, improper lifting techniques, or remaining in one position for too long.

  2. Skin Diseases and Disorders
    Skin diseases are often a direct result of occupational exposure, making the skin a target organ or entry route for toxic substances. Common occupational skin disorders include allergic and irritant dermatitis, eczema, rashes, oil acne, chromium ulcers, and chemical burns.

  3. Noise-Induced Hearing Loss
    This disorder is prevalent in environments with high noise levels, particularly in the manufacturing sector, leading to repeated trauma to the auditory system. Exposure to high decibels can cause significant and sometimes permanent damage to hearing.

  4. Respiratory Disorders
    The inhalation of toxic substances at the workplace can lead to respiratory disorders, as the lungs can serve both as the target organ for disease and a portal of entry for harmful agents.

Prevention and Control of Occupational Diseases

The prevention and control of occupational diseases necessitate active engagement from both employers and employees, along with support from governmental bodies. This involves implementing coordinated programs designed to monitor and minimize occupational hazards. These programs require professionally trained personnel who can effectively reduce the occurrence of workplace injuries and illnesses.

Specific Example: Hearing Loss

Hearing loss is defined as a significant impairment in hearing, where normal thresholds of 20 dB or better are not achieved in both ears. The primary causes include congenital factors, prolonged exposure to high noise levels, age-related decline, infections, and ototoxic medications, which can adversely affect ear function.

Pathways for Hearing

  1. Air Conduction
    Involves sound waves traveling through air and reaching the auditory structures from the external ear canal to the auditory nerve.

  2. Bone Conduction
    Occurs when vibrations caused by sound waves induce vibrations in the bones of the skull, sending signals through the fluid surrounding the cochlea.

Factors Influencing Sound Levels

  • Sound Frequency: Ranges from 16 Hz to 20,000 Hz; higher frequencies can pose greater risks.

  • Acoustic Intensity: Measured in decibels (dB), indicating pressure from sound vibrations.

  • Duration: Extended exposure increases the potential for damage to auditory systems.

  • Nature of Noise: Whether the noise is stable, fluctuating, or intermittent; impact noise is particularly harmful.

Definition of Noise

Noise, described as an unwanted or uncomfortable sound, is the leading preventable cause of permanent sensorineural hearing loss. Hearing damage can occur from acute exposure to very loud sounds (140 dB - 160 dB) or chronic exposure to high noise levels (greater than 85 dB).

Sources of Noise

Common sources include workplace machinery, woodworking tools, loud music, and firearms.

Occupations at Risk

Professions at elevated risk for noise-induced disorders include construction, mining, transportation, manufacturing, military operations involving jet engines, and jobs that involve the use of loud machinery.

Types of Hearing Loss

  1. Conductive Hearing Loss: Results from structural problems in the ear affecting sound wave movement.

  2. Sensorineural Hearing Loss: Caused by damage to the inner ear's hair cells or auditory nerves, often due to exposure to loud sounds or ototoxic drugs.

Hearing Loss Severity Levels

  • Mild: Cannot hear sounds below 45 dB.

  • Moderate: Difficulty hearing conversational speech, particularly with background noise. (cannot hear 60 dB)

  • Moderately Severe: Very challenging to hear ordinary speech sounds. (cannot hear below 75 dB)

  • Severe: Conversational speech is inaudible; significantly affects communication.

  • Profound: Near-complete deafness, with most sounds inaudible.

Acute vs. Chronic Noise Exposure

  1. Acute Noise Exposure: Results in immediate hearing loss from loud events (e.g., explosions).

  2. Chronic Noise Exposure: Often deemed an occupational disease, develops gradually and leads to irreversible hearing loss over time.

Monitoring and Reducing Hazardous Exposure

Strategies to mitigate noise exposure include:

  • Prioritizing the reduction of noise at its source

  • Modifying noise-generating processes

  • Providing personal protective equipment (PPE), such as earplugs or ear defenders

  • Regular monitoring of exposure levels and conducting hearing tests for at-risk employees.

Personal Protective Equipment (PPE)

PPE is essential in reducing workplace injuries and illnesses, especially in hazardous environments. Types include gloves, safety glasses, respirators, and hard hats. When selecting PPE, consider exposure types, durability, and proper fit to ensure comfort and effectiveness.

Ensuring Proper Use of PPE

For optimal protection, PPE must be appropriately designed, maintained, and fit the user. Training on correct usage and limitations is mandated for employees required to use PPE.

Good Housekeeping and Safety Practices

Adopting 5S (Sort, Set in Order, Sweep, Standardize, Sustain) can improve workplace organization and safety. Poor housekeeping can result in accidents such as slips, trips, and falls, highlighting the importance of a clean and safe working environment.