Occupational Hazards: Classification — MCQs

10 questions

Which among the following occupations is a risk factor for cutaneous larva migrans?

A person working in a dye factory presented with nausea, vomiting, dark bloody stools, conjunctivitis, and a burning sensation in the throat and stomach. Which poisoning do you suspect in this case?

A construction worker came to the OPD complaining of white fingers. He has been working in the cement and concrete industry and has been working on heavy machinery drills, wood, and furniture polishing for 20 years. What is the most likely etiology for this condition?

CAGE questionnaire is used in:

Which of the following is an occupational lung disease but not a pneumoconiosis?

A factory worker develops hearing loss. Most likely affected frequency range (Hz)?

In noise induced hearing loss, audiogram shows a typical notch at

An organism produces cutaneous disease (malignant pustule or eschar) at the site of inoculation in handlers of animal skins. Most likely organism is:

Which of the following is not considered an occupational cancer?

Q10

Dialysis patients are prone to develop

Occupational Hazards: Classification Indian Medical PG Practice Questions and MCQs

Question 1: Which among the following occupations is a risk factor for cutaneous larva migrans?

A. A poultry worker
B. A kennel worker
C. A lifeguard in a swimming pool
D. Farmer (Correct Answer)

Explanation: ***Farmer*** - Farmers are at high risk due to frequent direct contact with **contaminated soil** or sandy environments where animal feces, especially from dogs and cats, might be present. - Exposure to **larvae of hookworms** such as *Ancylostoma braziliense* and *Ancylostoma caninum*, which can penetrate unprotected skin (e.g., bare feet while working) from the soil. *A lifeguard in a swimming pool* - Lifeguards primarily work in **chlorinated water** or on clean, well-maintained pool decks, which do not typically harbor hookworm larvae. - While they might be exposed to other skin conditions, **cutaneous larva migrans** is not a common risk associated with this occupation. *A poultry worker* - Poultry workers are primarily exposed to avian environments, where hookworm species that cause cutaneous larva migrans in humans are typically **not found**. - Their work environment generally does not involve direct contact with soil contaminated by **canine or feline feces**. *A kennel worker* - While kennel workers handle dogs and cats, which are carriers of hookworms, their primary exposure is to the animals themselves or their immediate cleaned environments, not typically **soil contaminated with larvae**. - The mode of transmission for cutaneous larva migrans is through **soil contact** rather than direct animal handling in a controlled kennel setting.

Question 2: A person working in a dye factory presented with nausea, vomiting, dark bloody stools, conjunctivitis, and a burning sensation in the throat and stomach. Which poisoning do you suspect in this case?

A. Potassium permanganate (Correct Answer)
B. Lead
C. Arsenic
D. Thallium

Explanation: ***Potassium permanganate*** - The presence of **nausea, vomiting, dark bloody stools, conjunctivitis, and a burning sensation in the throat and stomach** is highly indicative of **potassium permanganate poisoning**, which is a caustic agent. - Exposure in a **dye factory** setting further supports this, as potassium permanganate is used as an **oxidizing agent** and **dyeing agent** in various industries. *Lead* - Lead poisoning typically presents with **neurological symptoms** (e.g., foot drop, wrist drop, encephalopathy), **gastrointestinal complaints** (e.g., colic, constipation), and **hematological abnormalities** (e.g., anemia with basophilic stippling). - The acute caustic effects like **burning sensation in the throat and bloody stools** are not characteristic of lead poisoning. *Arsenic* - Acute arsenic poisoning often involves **severe gastroenteritis** ("rice-water stools"), **garlic odor on breath**, **peripheral neuropathy**, and **cardiac arrhythmias**. - While it can cause gastrointestinal distress, the specific caustic burn and conjunctivitis alongside the industrial exposure profile point away from arsenic. *Thallium* - Thallium poisoning is characterized by **rapid hair loss (alopecia)**, **severe peripheral neuropathy**, and **gastrointestinal symptoms** (e.g., abdominal pain, vomiting, diarrhea). - The constellation of symptoms described, particularly the caustic burn and dark bloody stools, does not align with the typical presentation of thallium toxicity.

Question 3: A construction worker came to the OPD complaining of white fingers. He has been working in the cement and concrete industry and has been working on heavy machinery drills, wood, and furniture polishing for 20 years. What is the most likely etiology for this condition?

A. Candidal infection of the fingers due to continuous exposure to water
B. Exposure to thinners and paints
C. Continuous exposure to cement and concrete
D. Continuous exposure to drills and machines (Correct Answer)

Explanation: ***Continuous exposure to drills and machines*** - The use of **heavy machinery drills** subjects the hands to **vibration**, which is a well-known cause of **Raynaud's phenomenon**, presenting as "white fingers" due to **vasospasm**. - This condition, often referred to as **vibration white finger**, is a common occupational hazard for workers using vibratory tools over long periods. *Candidal infection of the fingers due to continuous exposure to water* - While prolonged exposure to moisture can cause **Candidal infections** (e.g., paronychia), this typically presents as **redness, swelling, and pain** around the nails or skin, not the characteristic "white fingers" of Raynaud's. - White fingers due to candidiasis are not a primary manifestation and lack the **vasospastic component** seen with vibration exposure. *Exposure to thinners and paints* - Exposure to chemicals like **thinners and paints** can cause **irritant or allergic contact dermatitis**, leading to redness, itching, and skin lesions. - However, direct exposure to these substances is not typically associated with the sudden, episodic **blanching of fingers** characteristic of Raynaud's phenomenon. *Continuous exposure to cement and concrete* - **Cement and concrete** exposure often leads to **irritant or allergic contact dermatitis** due to the alkaline nature of cement, causing dryness, cracking, and eczema. - This type of exposure does not directly cause the **vasospastic episodes** that result in "white fingers."

Question 4: CAGE questionnaire is used in:

A. Opiate poisoning
B. Alcohol dependence (Correct Answer)
C. Dhatura poisoning
D. Barbiturate poisoning

Explanation: ***Alcohol dependence*** - The **CAGE questionnaire** is a widely used screening tool for identifying potential **alcohol problems** and dependence. - The acronym CAGE stands for Cutting down, Annoyance by criticism, Guilty feelings, and Eye-openers, all related to drinking habits. *Opiate poisoning* - Screening for opiate use or poisoning typically involves asking about **drug use history**, conducting **urine drug screens**, and observing specific clinical signs like **pinpoint pupils** and **respiratory depression**. - The CAGE questionnaire is not designed to screen for opiate use. *Dhatura poisoning* - **Dhatura poisoning** is characterized by anticholinergic symptoms like **dilated pupils**, **dry mouth**, **tachycardia**, and **delirium**. - Diagnosis relies on clinical presentation and a history of exposure, not a specific questionnaire like CAGE. *Barbiturate poisoning* - **Barbiturate poisoning** presents with central nervous system depression, including **sedation**, **respiratory depression**, and **hypotension**. - Diagnosis involves a clinical assessment, history of barbiturate use, and toxicology screens, not the CAGE questionnaire.

Question 5: Which of the following is an occupational lung disease but not a pneumoconiosis?

A. Silicosis
B. Brucellosis
C. Anthracosis
D. Byssinosis (Correct Answer)

Explanation: ***Byssinosis*** - This is an **occupational lung disease** seen in textile workers exposed to cotton, flax, or hemp dust, but it is **NOT a true pneumoconiosis**. - Unlike pneumoconioses which involve **irreversible fibrosis** from inorganic dust accumulation, byssinosis causes **reversible airway obstruction** and bronchospasm. - It presents with characteristic **chest tightness and dyspnea** that worsen on the **first day back at work** (Monday morning syndrome) and improve over the work week. - The pathophysiology involves **endotoxin-mediated bronchoconstriction**, not dust deposition leading to fibrosis. *Silicosis* - This is a classic **pneumoconiosis** caused by inhalation of **crystalline silica dust** in occupations like mining, sandblasting, and stone cutting. - It leads to **nodular fibrosis** and progressive lung damage from inorganic dust accumulation. *Anthracosis* - This is a **pneumoconiosis** resulting from inhalation of **coal dust**, commonly seen in coal miners. - It involves accumulation of carbon particles leading to pulmonary fibrosis (coal worker's pneumoconiosis). *Brucellosis* - While this is an **occupational infection** (veterinarians, farm workers, slaughterhouse workers), it is **not primarily a lung disease**. - It is a **systemic bacterial infection** caused by *Brucella* species affecting the reticuloendothelial system. - Main symptoms include undulant fever, sweats, arthralgia, and hepatosplenomegaly, not pulmonary manifestations.

Question 6: A factory worker develops hearing loss. Most likely affected frequency range (Hz)?

A. 3000-6000 Hz (Correct Answer)
B. 8000-10000 Hz
C. 500-1000 Hz
D. 1000-2000 Hz

Explanation: ***3000-6000*** - **Noise-induced hearing loss (NIHL)**, common in factory workers, typically affects the **higher frequencies** first, particularly the 3000-6000 Hz range. - This specific range includes a characteristic "notch" at **4000 Hz** often seen in audiograms of individuals with NIHL. *8000-10000* - While high frequencies can be affected, the **initial and most pronounced damage** in NIHL often occurs at slightly lower frequencies (3000-6000 Hz). - Hearing loss at over **8000 Hz** is usually associated with presbycusis (age-related hearing loss) or ototoxic medications rather than primarily NIHL. *500-1000* - Hearing loss in the **lower frequencies** (500-1000 Hz) is less common for early manifestations of noise-induced hearing loss. - Loss in this range is more indicative of **conductive hearing loss** or other types of sensorineural hearing loss, but not typically NIHL. *1000-2000* - While important for speech comprehension, this range is generally affected **later** in the progression of noise-induced hearing loss. - Initial pure tone audiogram changes due to NIHL are rarely seen initially at these frequencies, with the **4000 Hz notch** being a hallmark.

Question 7: In noise induced hearing loss, audiogram shows a typical notch at

A. 2000 Hz
B. 3000 Hz
C. 4000 Hz (Correct Answer)
D. 1000 Hz

Explanation: ***4000 Hz*** - Noise-induced hearing loss (NIHL) characteristically presents with a **notch** at **4000 Hz** on an audiogram, indicating damage to the hair cells in the cochlea that are tuned to this frequency range. - This specific frequency is particularly vulnerable to damage from loud noise exposure due to the **resonant properties of the external auditory canal** and the mechanical action of the inner ear. *2000 Hz* - While hearing loss can occur at 2000 Hz, it is not the typical or most prominent frequency affected in the early stages of **noise-induced hearing loss**. - Other types of hearing loss, such as **presbycusis** (age-related hearing loss), might show a general decline across various frequencies but not a distinct notch at 2000 Hz. *3000 Hz* - A notch at 3000 Hz could be observed, but the **4000 Hz notch** is considered the hallmark and most consistent finding in **NIHL**. - The damage pattern in NIHL tends to focus around the 4000 Hz region before spreading to adjacent frequencies. *1000 Hz* - Hearing loss at 1000 Hz is generally less common in the initial stages of **noise-induced hearing loss**, as the inner ear structures responsive to lower frequencies are often more resilient to noise damage. - Significant hearing loss at 1000 Hz would typically indicate a more advanced or diffuse hearing loss, rather than the characteristic **NIHL pattern**.

Question 8: An organism produces cutaneous disease (malignant pustule or eschar) at the site of inoculation in handlers of animal skins. Most likely organism is:

A. Neisseria meningitidis
B. Bacillus anthracis (Correct Answer)
C. Pseudomonas aeruginosa
D. Cryptococcus neoformans

Explanation: ***Bacillus anthracis*** - This description is classic for **cutaneous anthrax**, characterized by a **malignant pustule** or **eschar** that develops at the site of inoculation. - The context of handling **animal skins** (e.g., wool-sorter's disease) is a key epidemiological clue for _Bacillus anthracis_ infection. *Neisseria meningitidis* - Primarily causes **meningitis** and **meningococcemia**, involving a petechial or purpuric rash, not a single eschar or malignant pustule. - There is no direct association with handling animal skins. *Pseudomonas aeruginosa* - This bacterium is often associated with **opportunistic infections** in immunocompromised individuals, burn patients, or those with indwelling medical devices. - While it can cause skin lesions (e.g., **ecthyma gangrenosum**), these are distinct from the anthrax eschar and are not linked to animal skin exposure. *Cryptococcus neoformans* - A **fungus** that primarily causes **cryptococcal meningitis** or pulmonary infections, especially in immunocompromised individuals. - Skin manifestations, when they occur, are typically papules, nodules, or ulcers, not the classic **cutaneous anthrax eschar**.

Question 9: Which of the following is not considered an occupational cancer?

A. Lung
B. Breast (Correct Answer)
C. Liver
D. Bladder

Explanation: ***Breast*** - Breast cancer has a **limited association** with occupational exposure compared to other cancers [1], mainly influenced by genetic and hormonal factors. - While some studies suggest minor correlations, the **impact of environment** and occupation is considerably less significant for breast cancer. *Bladder* - Strongly linked to **aromatic amines** from dyes and rubber manufacturing [2], as well as exposures to **chemical irritants**. - The **occupational risk** is well-documented, particularly among workers in the chemical industry [1]. *Liver* - Associated with **chemical exposures** such as aflatoxins and certain industrial solvents, particularly in the manufacturing and agriculture sectors. - Significant occupational hazards, like **vinyl chloride**, have demonstrated a clear link to liver cancer [2]. *Lung* - Closely tied to **asbestos** [1][3], **smoke**, and other pollutants, highlighting the role of industrial environments in increasing risk. - **Occupational exposure** remains a major contributor to lung cancer rates, particularly in mining and construction [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 286. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 217-218. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 221-222.

Question 10: Dialysis patients are prone to develop

A. Zinc toxicity
B. Iron toxicity
C. Aluminium toxicity (Correct Answer)
D. Lead toxicity

Explanation: ***Aluminium toxicity*** - **Aluminium toxicity** is a significant concern in dialysis patients due to impaired renal excretion of aluminium, which can accumulate from dialysate, oral phosphate binders, or contaminated water. - This toxicity can lead to various complications, including **osteomalacia**, **encephalopathy**, and **anemia**. *Zinc toxicity* - **Zinc toxicity** is uncommon in dialysis patients and typically results from excessive supplementation, not a direct complication of dialysis itself. - Excess zinc can interfere with **copper absorption**, potentially leading to copper deficiency. *Iron toxicity* - While iron supplementation is often used in dialysis patients to treat anemia, **iron toxicity** due to overload is usually managed by monitoring iron levels and adjusting dosage. - It is not an inherent predisposition due to dialysis itself, but rather a potential consequence of therapy. *Lead toxicity* - **Lead toxicity** is primarily associated with environmental exposure and is not a specific complication directly linked to the dialysis process or renal failure [1]. - Lead accumulation is not typically worsened by impaired renal function in the same manner as aluminium [1].

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