Tobacco Use Disorder — MCQs
Transdermal patch is not used for the following drug?
A 45-year-old male reports several years of asbestos exposure while working in the construction industry. He reports smoking 2 packs of cigarettes per day for over 20 years. Smoking and asbestos exposure increase the incidence of which of the following diseases?
Which condition does NOT increase the risk of cervical cancer?
CAGE questionnaire is used in:
Which of the following is true regarding nicotine substitution therapy?
Which of the following treatment options for nicotine dependence is considered the least effective?
A patient with bronchial asthma develops osteoporosis. Most likely mechanism?
What is the most common cancer diagnosed in men?
National Cancer Awareness Day is celebrated on:
Under which one of the following conditions, the HPA axis suppression is likely to result in crisis due to adrenal insufficiency following withdrawal of glucocorticoids?
Tobacco Use Disorder Indian Medical PG Practice Questions and MCQs
Question 1: Transdermal patch is not used for the following drug?
- A. GTN
- B. Naloxone (Correct Answer)
- C. Fentanyl
- D. Nicotine
Explanation: Naloxone - **Naloxone** is an **opioid antagonist** primarily used for the emergency reversal of opioid overdose, requiring a rapid onset of action [3]. - Its therapeutic goal is immediate, high systemic concentrations, which is not suitable for the slow, sustained release characteristic of a transdermal patch. *GTN* - **Glyceryl trinitrate (GTN)** is used in a transdermal patch for the **prophylaxis of angina**, providing a sustained release [1]. - This allows for consistent vasodilation and reduction of cardiac workload over an extended period [1]. *Fentanyl* - **Fentanyl** transdermal patches are commonly used for the management of **chronic severe pain**, particularly in opioid-tolerant patients [2]. - The patch provides continuous systemic delivery of the potent opioid, offering long-lasting pain relief [2]. *Nicotine* - **Nicotine** patches are widely used as **nicotine replacement therapy (NRT)** to aid in smoking cessation. - They deliver a steady dose of nicotine transdermally, reducing withdrawal symptoms and cravings.
Question 2: A 45-year-old male reports several years of asbestos exposure while working in the construction industry. He reports smoking 2 packs of cigarettes per day for over 20 years. Smoking and asbestos exposure increase the incidence of which of the following diseases?
- A. Emphysema
- B. Malignant pulmonary mesothelioma
- C. Multiple myeloma
- D. Bronchogenic carcinoma (Correct Answer)
- E. Chronic bronchitis
Explanation: ***Bronchogenic carcinoma*** - **Smoking** is the leading cause of **bronchogenic carcinoma**, and **asbestos exposure** significantly *multiplies* its risk, rather than simply adding to it. - This synergistic effect means that smokers exposed to asbestos have a **much higher incidence** of lung cancer compared to those with either exposure alone. *Emphysema* - Primarily linked to **smoking** and chronic exposure to irritants, but asbestos exposure does not significantly increase its incidence. - While both smoking and asbestos can cause pulmonary issues, their primary mechanisms for emphysema are distinct. *Malignant pulmonary mesothelioma* - **Malignant mesothelioma** is strongly associated with **asbestos exposure**, but its incidence is *not significantly increased* by smoking. - Smoking is a risk factor for lung cancer, but not a primary risk factor for mesothelioma itself. *Multiple myeloma* - This is a **hematologic malignancy** (cancer of plasma cells) and has no established link with either **smoking** or **asbestos exposure**. - Its risk factors are largely genetic and related to other environmental factors, but not directly linked to respiratory toxins. *Chronic bronchitis* - **Chronic bronchitis** is primarily caused by **smoking** and exposure to environmental pollutants. - While asbestos exposure can cause lung damage, it doesn't directly or significantly increase the incidence of chronic bronchitis.
Question 3: Which condition does NOT increase the risk of cervical cancer?
- A. Multiple sexual partners
- B. HPV infection
- C. Nulliparity (Correct Answer)
- D. Smoking
Explanation: ***Nulliparity*** - **Nulliparity** (never having given birth) is generally associated with a *reduced* risk of cervical cancer, or it has no significant impact. - Increased parity (multiple full-term pregnancies) is a risk factor, possibly due to hormonal changes or chronic inflammation. *Multiple sexual partners* - Having multiple sexual partners increases the risk of exposure to **Human Papillomavirus (HPV)**, the primary cause of cervical cancer. - Greater exposure to various HPV strains elevates the likelihood of persistent viral infection and subsequent cellular changes. *HPV infection* - **High-risk HPV strains** (e.g., HPV 16, 18) are the leading cause of cervical cancer, responsible for almost all cases. - Persistent infection with these oncogenic HPV types leads to progressive cervical dysplasia and, eventually, invasive cancer. *Smoking* - Smoking is an independent risk factor for cervical cancer, even after accounting for HPV infection. - Chemicals in tobacco smoke can reach the cervical mucus and damage DNA, impairing the immune system's ability to clear HPV infections.
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 true regarding nicotine substitution therapy?
- A. Preferably given by gastrointestinal route.
- B. Varenicline comes with a black box warning of cardiovascular death
- C. There should be a 15-minute gap between nicotine gum and coffee/soda/acidic food as they decrease its absorption (Correct Answer)
- D. Nicotine chewing gum is better for constant use as it gives 25% higher blood level than lozenges
Explanation: ***There should be a 15-minute gap between nicotine gum and coffee/soda/acidic food as they decrease its absorption*** - **Acidic beverages** like coffee, soda, and fruit juices can alter the pH of the mouth and stomach, which significantly **reduces the absorption of nicotine** from gum. - This recommendation ensures optimal **nicotine delivery** and effectiveness of the therapy in reducing withdrawal symptoms. *Preferably given by gastrointestinal route* - Nicotine has poor bioavailability when taken orally due to **extensive first-pass metabolism** in the liver. - Nicotine substitution therapies are therefore preferentially administered via **transdermal**, **buccal** (gum, lozenges), or **nasal routes** to bypass first-pass metabolism and achieve therapeutic blood levels more effectively. *Varenicline comes with a black box warning of cardiovascular death* - Varenicline (Chantix) previously had a black box warning for **neuropsychiatric side effects**, including suicidal ideation and depression, which has since been removed due to further studies. - It does not carry a black box warning specifically for **cardiovascular death**, though cardiovascular events have been a subject of study, particularly in patients with pre-existing cardiovascular conditions. *Nicotine chewing gum is better for constant use as it gives 25% higher blood level than lozenges* - While both nicotine gum and lozenges are effective, the **blood levels achieved are comparable**, and the choice often depends on patient preference and proper technique. - Nicotine gum is best used with a **"chew and park" technique** to allow buccal absorption, and constant chewing can lead to excessive swallowing of nicotine, causing gastrointestinal upset.
Question 6: Which of the following treatment options for nicotine dependence is considered the least effective?
- A. Nicotine tablets
- B. Nicotine patches
- C. Nicotine gums (Correct Answer)
- D. Varenicline
Explanation: **Nicotine gums** - Among nicotine replacement therapies, **nicotine gums** often show **lower real-world effectiveness** due to adherence challenges and technique requirements. - They require a **specific chewing technique** (chew-and-park method) which is frequently done incorrectly, reducing nicotine absorption and efficacy. - **Adherence rates** are typically lower compared to patches due to taste issues, jaw discomfort, and the need for frequent dosing throughout the day. - Real-world quit rates with gum tend to be **lower than patches** despite similar pharmacological potential when used correctly. *Nicotine patches* - **Nicotine patches** provide **steady-state nicotine delivery** over 16-24 hours with once-daily application. - They have **superior adherence** compared to other NRTs due to convenience and ease of use. - Consistently demonstrate **higher real-world quit rates** among NRTs, making them a first-line option. *Varenicline* - **Varenicline** is a **partial agonist at α4β2 nicotinic receptors**, reducing cravings while blocking rewarding effects of smoking. - It is the **most effective pharmacological treatment** for smoking cessation (quit rates 30-35% vs 15-20% for NRTs). - Superior efficacy compared to all NRTs in multiple meta-analyses and clinical trials. *Nicotine tablets* - **Nicotine lozenges/tablets** dissolve slowly in the mouth, providing **rapid nicotine absorption** through oral mucosa. - They offer **better discretion and convenience** than gum without the chewing technique requirement. - **Adherence and efficacy** are generally comparable to or slightly better than nicotine gum in clinical studies.
Question 7: A patient with bronchial asthma develops osteoporosis. Most likely mechanism?
- A. Calcium malabsorption
- B. Inflammatory mediators
- C. Physical inactivity
- D. Chronic steroid use (Correct Answer)
Explanation: ***Chronic steroid use*** - **Glucocorticoids**, commonly used in the treatment of bronchial asthma, can directly inhibit **osteoblast activity** and promote **osteoclast activity**, leading to bone loss [1]. - They also reduce intestinal **calcium absorption** and increase **renal calcium excretion**, further disrupting calcium homeostasis and contributing to osteoporosis [1]. *Calcium malabsorption* - While **malabsorption syndromes** can cause osteoporosis, asthma itself does not directly lead to primary calcium malabsorption. - Steroids used in asthma treatment can *contribute* to reduced calcium absorption, but the primary mechanism of steroid-induced osteoporosis involves broader effects on bone metabolism, not solely malabsorption [1]. *Inflammatory mediators* - **Inflammatory mediators** associated with asthma may play a role in bone density loss, but their direct impact is less significant and less common than the effects of chronic steroid use [2]. - While chronic inflammation can indirectly affect bone remodeling, it is not the most likely or direct mechanism for osteoporosis in this clinical scenario compared to steroid exposure [1]. *Physical inactivity* - **Physical inactivity** can contribute to osteoporosis due to reduced mechanical loading on bones, but it is not a direct or primary cause specific to bronchial asthma [3]. - While severe asthma may lead to some activity limitation, the primary mechanism linking asthma treatment to osteoporosis is typically medication-related, rather than lifestyle factors alone.
Question 8: What is the most common cancer diagnosed in men?
- A. Bladder cancer
- B. Colorectal cancer
- C. Oral cancer (Correct Answer)
- D. Prostate cancer
Explanation: ***Oral cancer*** - **Oral cancer** is the most common cancer diagnosed in men in India, particularly cancers of the **lip, oral cavity, and oropharynx**. - India accounts for approximately **one-third of the global burden** of oral cancers. - Major risk factors include **tobacco chewing (gutka, pan masala, betel quid), smoking, and alcohol consumption**. - Early detection through **oral examination** and avoiding tobacco products are key preventive measures. *Prostate cancer* - While prostate cancer is the most common cancer in men in **Western populations**, it ranks **much lower in India** (typically 3rd-5th most common). - Incidence is increasing in urban Indian populations due to improved detection and lifestyle changes. *Bladder cancer* - **Bladder cancer** is significant but less common than oral cancer in Indian men. - Risk factors include **smoking** and occupational exposure to chemicals. *Colorectal cancer* - **Colorectal cancer** is increasing in incidence in India but remains less common than oral cancer in men. - Screening with **colonoscopy** is recommended for early detection, especially in those with family history.
Question 9: National Cancer Awareness Day is celebrated on:
- A. 31st November
- B. 7th November (Correct Answer)
- C. 31st May
- D. 7th May
Explanation: ***7th November*** - **National Cancer Awareness Day** in India is observed annually on **November 7th** to raise awareness about cancer symptoms, prevention, and early detection. - This date marks the birth anniversary of **Madame Marie Curie**, whose pioneering work in radioactivity significantly contributed to cancer treatment. *31st November* - **November has only 30 days**, making "31st November" an invalid date. - This date is not recognized for any significant health awareness campaign related to cancer. *31st May* - **May 31st** is recognized globally as **World No Tobacco Day**, an initiative by the World Health Organization (WHO) to highlight the health risks of tobacco. - While tobacco use is a major cause of cancer, this day is not specifically designated as National Cancer Awareness Day. *7th May* - **May 7th** does not hold specific recognition as **National Cancer Awareness Day** in India. - While there are various cancer awareness initiatives throughout the year, this particular date is not associated with this specific observance.
Question 10: Under which one of the following conditions, the HPA axis suppression is likely to result in crisis due to adrenal insufficiency following withdrawal of glucocorticoids?
- A. If glucocorticoids have been prescribed repeatedly within the previous year (Correct Answer)
- B. If the dose is less than equivalent of 5 mg prednisolone per day
- C. If glucocorticoids have been given by intravenous route for five days
- D. If glucocorticoids have been administered orally for one week
Explanation: ***Correct: If glucocorticoids have been prescribed repeatedly within the previous year*** - While a **single short course** of glucocorticoids typically does not cause significant HPA axis suppression, **repeated exposure over time** (multiple courses within a year) can lead to **cumulative suppression** of the hypothalamic-pituitary-adrenal axis - This is particularly true if the courses are **frequent, prolonged, or at high doses** without adequate recovery periods between treatments - **Chronic or repeated suppression** impairs the body's ability to produce sufficient endogenous cortisol when exogenous glucocorticoids are withdrawn, increasing the risk of **adrenal insufficiency crisis** - Among the given options, this represents the **highest risk scenario** for HPA axis suppression requiring careful withdrawal management *Incorrect: If the dose is less than equivalent of 5 mg prednisolone per day* - Doses **< 5 mg prednisolone equivalent per day** are considered **physiologic replacement doses** - Such low doses do **NOT suppress** the HPA axis significantly - This represents a **low-risk scenario** for adrenal insufficiency - Standard teaching: HPA suppression risk increases with doses **> 20 mg/day prednisolone equivalent** *Incorrect: If glucocorticoids have been given by intravenous route for five days* - **Short-course therapy (< 7-10 days)**, even at high doses and by IV route, typically does **NOT cause prolonged HPA axis suppression** - The HPA axis usually **recovers rapidly** after brief exposure - Abrupt discontinuation after 5 days **does not typically require tapering** and is unlikely to cause adrenal crisis - The route of administration (IV vs oral) is less important than **duration and total dose** *Incorrect: If glucocorticoids have been administered orally for one week* - Similar to the IV scenario, **one week of oral therapy** is considered a **short course** - Such brief duration typically does not cause significant HPA axis suppression requiring taper - The adrenal glands usually maintain responsiveness after only **7 days** of treatment - **Duration > 3 weeks** at supraphysiologic doses is the traditional threshold for concern about HPA suppression
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