Addiction Medicine Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Addiction Medicine. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Addiction Medicine Indian Medical PG Question 1: A 55-year-old drug addict from California presents with euphoria, altered time perception, and conjunctival injection, along with impairment of judgment. The most likely cause of this is addiction to which substance?
- A. Marijuana (Correct Answer)
- B. Cocaine
- C. Phencyclidine
- D. Benzodiazepine
Addiction Medicine Explanation: ***Marijuana***
- **Euphoria**, altered time perception, and **conjunctival injection** are classic symptoms associated with marijuana use.
- Impairment of judgment and coordination are also common effects of **cannabis intoxication**.
*Cocaine*
- Cocaine intoxication typically presents with **psychomotor agitation**, **tachycardia**, **hypertension**, and **dilated pupils**, not conjunctival injection.
- While it causes euphoria and altered perception, the specific combination of symptoms points away from cocaine.
*Phencyclidine*
- **Phencyclidine (PCP)** often causes **nystagmus**, violence, and **dissociative symptoms** like derealization and depersonalization, which are not described.
- It can also lead to severe agitation and unpredictable behavior, distinct from the patient's presentation.
*Benzodiazepine*
- Benzodiazepine intoxication or abuse typically leads to **sedation**, ataxia, and **respiratory depression**, rather than euphoria and conjunctival injection.
- The effects are more consistent with central nervous system depression.
Addiction Medicine Indian Medical PG Question 2: The primary dopaminergic reward center in the brain is?
- A. Ventral tegmental area (Correct Answer)
- B. Hippocampus
- C. Amygdala
- D. Thalamus
Addiction Medicine Explanation: ***Ventral tegmental area***
- The **ventral tegmental area (VTA)** is a key component of the mesolimbic dopamine system, often referred to as the **reward pathway** in the brain.
- It projects dopamine neurons to various areas, including the **nucleus accumbens** and prefrontal cortex, mediating feelings of pleasure and reward.
*Hippocampus*
- The **hippocampus** is primarily involved in **memory formation** and spatial navigation.
- While it interacts with reward pathways, it is not the primary dopaminergic reward center itself.
*Amygdala*
- The **amygdala** is critical for processing **emotions**, particularly fear and aggression, and plays a role in emotional memory.
- It modulates reward responses but is not the primary source of dopaminergic reward signaling.
*Thalamus*
- The **thalamus** acts as a **relay station** for sensory information, directing it to appropriate cortical areas.
- It has diverse functions but is not recognized as the central dopaminergic reward area.
Addiction Medicine Indian Medical PG Question 3: A person presents to the outpatient department with tremors and visual hallucinations after a 2-day history of alcohol cessation. What is the diagnosis?
- A. Korsakoff’s psychosis
- B. Delirium tremens (Correct Answer)
- C. Wernicke encephalopathy
- D. Alcoholic hallucinosis
Addiction Medicine Explanation: ***Delirium tremens***
- Delirium tremens is a severe form of **alcohol withdrawal** characterized by **tremors**, disorientation, and **visual hallucinations**, typically appearing **48 to 96 hours** (2-4 days) after the last drink.
- This is a medical emergency with potential for **seizures**, **hyperthermia**, and **cardiovascular collapse** due to dysregulation of neurotransmitters (decreased **GABA** activity and increased **glutamate** activity).
- Autonomic hyperactivity (tachycardia, hypertension, diaphoresis) is a key feature distinguishing it from other alcohol-related conditions.
*Korsakoff's psychosis*
- This is a chronic **neuropsychiatric syndrome** typically occurring after an episode of **Wernicke encephalopathy**, characterized by severe **memory impairment** (anterograde and retrograde amnesia) and **confabulation**.
- It develops over weeks to months in the course of chronic alcoholism and is **not an acute withdrawal syndrome**, unlike the symptoms described in this 2-day presentation.
*Wernicke encephalopathy*
- This is an acute neurological condition caused by **thiamine (vitamin B1) deficiency**, commonly seen in chronic alcoholics, characterized by the classic triad of **ophthalmoplegia** (especially nystagmus), **ataxia**, and **confusion**.
- While it can precede Korsakoff's psychosis and involves confusion, it does not typically present with the prominent **tremors** and **visual hallucinations** characteristic of alcohol withdrawal, and the timing (2 days post-cessation) points more toward withdrawal rather than nutritional deficiency.
*Alcoholic hallucinosis*
- Alcoholic hallucinosis involves primarily **auditory hallucinations** (often threatening voices) that occur without significant clouding of consciousness, typically within **12-24 hours** of alcohol cessation.
- Unlike delirium tremens, it **lacks autonomic instability**, severe tremors, and global disorientation, and the hallucinations are predominantly auditory rather than visual.
Addiction Medicine Indian Medical PG Question 4: Cell bodies of orexigenic neurons are present in?
- A. Dorsal raphe
- B. Locus coeruleus
- C. Lateral hypothalamic area (Correct Answer)
- D. Hippocampus
Addiction Medicine Explanation: ***Lateral hypothalamic area***
- The **lateral hypothalamic area** (LHA) contains neurons that produce **orexin (hypocretin)**, a neuropeptide critical for promoting appetite and wakefulness.
- Stimulation of the LHA leads to increased food seeking and consumption, earning it the moniker "**feeding center**."
*Dorsal raphe*
- The **dorsal raphe nucleus** is a key source of **serotonin** in the brain, involved in mood, sleep-wake cycles, and appetite regulation (often promoting satiety).
- It does not primarily house orexigenic neurons that directly stimulate appetite.
*Locus coerulus*
- The **locus coeruleus** is the primary source of **norepinephrine** in the brain, playing a significant role in arousal, attention, and stress response.
- While it modulates appetitive behaviors indirectly, its neurons are not the primary orexigenic cell bodies.
*Hippocampus*
- The **hippocampus** is crucial for **learning, memory formation**, and spatial navigation.
- It is not directly involved in the primary neural circuits that control hunger and satiety through orexigenic neuropeptides.
Addiction Medicine Indian Medical PG Question 5: Mutations are due to changes in:
- A. DNA nucleotide sequence (Correct Answer)
- B. RNA nucleotide sequence
- C. Amino acid sequence of ribonuclease
- D. Cell membrane
Addiction Medicine Explanation: ***DNA nucleotide sequence***
- **Mutations** are defined as changes in the **genetic material**, which is primarily composed of **DNA**.
- These changes in the **nucleotide sequence** of DNA can alter the genetic code, leading to changes in **protein structure and function**.
*RNA nucleotide sequence*
- While RNA can have its nucleotide sequence altered, these changes are generally not considered true **mutations** in the heritable sense for most organisms.
- RNA is typically a temporary molecule, and changes to its sequence are usually not passed down to subsequent generations.
*Amino acid sequence of ribonuclease*
- An altered **amino acid sequence** in a protein like ribonuclease is a consequence of a **mutation in the DNA**, not the mutation itself.
- **Ribonucleases** are enzymes that catalyze the degradation of RNA, and their structure is determined by the **DNA sequence**.
*Cell membrane*
- The cell membrane is a **lipid bilayer** with embedded proteins that regulates cellular transport and communication.
- While its components can be affected by genetic mutations, alterations in the cell membrane itself do not constitute the primary definition of a **mutation**.
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