Neurodevelopmental Perspectives — MCQs
A 10 year old boy was brought to the psychiatrist by parents with complaints of not following the rules of school, arguing with teachers and fellow students. The parents report that he misbehaves with them too and at times tries to provoke them. What is the likely diagnosis?
ICD-10 chapter 1 describes?
Which of the following is not a known cause of neuroregression in children?
A child finds difficulty in spelling and reading, otherwise their IQ is normal, interacts well with parents and friends. Vision is normal. What is the most probable diagnosis of the condition?
A child with pervasive developmental disorder will have all of the following except:
A 15-year-old adolescent is brought in for evaluation due to repeated failure to conform to social norms, deceitfulness, impulsivity, and lack of remorse. What is the most likely diagnosis?
Which of the following is not a central characteristic of childhood autism?
A 45-year-old male's blood test shows an increase in Homovanillic acid (HVA). Which of the following conditions is this finding most likely associated with?
Increased suicidal tendency is associated with which neurochemical imbalance?
Which of the following features is NOT commonly associated with 22q11.2 deletion syndrome?
Neurodevelopmental Perspectives Indian Medical PG Practice Questions and MCQs
Question 1: A 10 year old boy was brought to the psychiatrist by parents with complaints of not following the rules of school, arguing with teachers and fellow students. The parents report that he misbehaves with them too and at times tries to provoke them. What is the likely diagnosis?
- A. Conduct disorder
- B. Oppositional defiant disorder (Correct Answer)
- C. Autism spectrum disorder
- D. Attention deficit hyperactivity disorder
Explanation: **Oppositional defiant disorder** - The boy's behaviors of **not following rules**, arguing with teachers and students, and **provoking parents** are characteristic features of ODD. - ODD is defined by a pattern of **angry/irritable mood**, argumentative/defiant behavior, or vindictiveness. *Conduct disorder* - Conduct disorder involves more serious violations of the **rights of others** or major **societal norms**, such as aggression towards people or animals, destruction of property, deceitfulness, or theft. - The scenario describes defiant and argumentative behavior, not the severe actions typical of conduct disorder. *Autism spectrum disorder* - ASD is characterized by persistent deficits in **social communication and interaction** across multiple contexts, and **restricted, repetitive patterns of behavior, interests, or activities.** - The provided symptoms do not align with the core diagnostic criteria for autism spectrum disorder. *Attention deficit hyperactivity disorder* - ADHD involves a persistent pattern of **inattention** and/or **hyperactivity-impulsivity** that interferes with functioning or development. - While some defiant behavior can coexist with ADHD, the primary presentation here is one of opposition and defiance, not predominantly inattention or hyperactivity.
Question 2: ICD-10 chapter 1 describes?
- A. Poisoning and consequences
- B. Psychiatric diseases
- C. Diseases of the nervous system
- D. Infectious and parasitic diseases (Correct Answer)
Explanation: ***Infectious and parasitic diseases*** - **ICD-10 Chapter 1** specifically categorizes codes related to **infectious and parasitic diseases**, ranging from A00 to B99. - This chapter covers a broad spectrum of conditions caused by microorganisms and parasites, such as bacterial, viral, fungal, and protozoal infections. *Poisoning and consequences* - **Poisoning and certain other consequences of external causes** are covered in ICD-10 Chapter 19, with codes typically ranging from T36-T65 for poisoning by drugs, medicaments, and biological substances. - This chapter focuses on injuries, poisoning, and certain other consequences of external causes, not infectious diseases. *Psychiatric diseases* - **Mental and behavioral disorders** (often referred to as psychiatric diseases) are described in ICD-10 Chapter 5, with codes ranging from F00 to F99. - This chapter includes conditions such as mood disorders, anxiety disorders, schizophrenia, and substance-related disorders. *Diseases of the nervous system* - **Diseases of the nervous system** are categorized in ICD-10 Chapter 6, with codes ranging from G00 to G99. - This chapter covers conditions affecting the brain, spinal cord, nerves, and neuromuscular junctions, such as stroke, epilepsy, and Parkinson's disease.
Question 3: Which of the following is not a known cause of neuroregression in children?
- A. Vitamin B12 deficiency
- B. Ataxia telangiectasia
- C. ADHD (Correct Answer)
- D. Wilson's disease
Explanation: ***ADHD*** - **Attention-deficit/hyperactivity disorder (ADHD)** is a neurodevelopmental disorder characterized by persistent patterns of inattention, hyperactivity, and impulsivity. It is **not** a cause of neuroregression. - While ADHD can impact cognitive and behavioral functioning, it does not involve a loss of previously acquired developmental milestones or skills. *Wilson's disease* - **Wilson's disease** is an inherited disorder that causes **copper accumulation** in organs, particularly the liver and brain. - Neurological symptoms, including **neuroregression**, can occur due to copper toxicity in the central nervous system. *Vitamin B12 deficiency* - **Vitamin B12 deficiency** can lead to neurological complications such as **subacute combined degeneration** of the spinal cord and peripheral neuropathy. - In children, severe or prolonged deficiency can impair brain development and lead to **developmental regression**. *Ataxia telangiectasia* - **Ataxia telangiectasia** is a rare, neurodegenerative, inherited disease that affects multiple body systems. - It is characterized by progressive **cerebellar ataxia**, leading to **neuroregression** and intellectual disability over time.
Question 4: A child finds difficulty in spelling and reading, otherwise their IQ is normal, interacts well with parents and friends. Vision is normal. What is the most probable diagnosis of the condition?
- A. ADHD
- B. Autism
- C. Asperger syndrome
- D. Dyslexia (Correct Answer)
Explanation: ***Dyslexia*** - This condition is characterized by **difficulties with accurate and/or fluent word recognition** and poor spelling and decoding abilities despite normal intelligence and adequate educational opportunities. - The child's **normal IQ** and good social interaction, coupled with specific issues in spelling and reading, strongly indicate dyslexia. *ADHD* - **Attention Deficit Hyperactivity Disorder** primarily presents with persistent patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning or development. - While academic difficulties can occur, the primary presenting problem is usually not confined to reading and spelling but rather a broader difficulty in attention or impulse control. *Autism* - **Autism Spectrum Disorder** is characterized by persistent deficits in social communication and social interaction across multiple contexts, and restricted, repetitive patterns of behavior, interests, or activities. - The child's ability to **interact well with parents and friends** makes autism an unlikely diagnosis, as deficits in social reciprocity are a hallmark feature. *Asperger syndrome* - Formerly a distinct diagnosis, **Asperger syndrome** is now considered part of the Autism Spectrum Disorder. Like autism, it involves difficulties in social interaction and communication. - Despite often having normal or above-average intelligence, individuals with Asperger syndrome typically exhibit **significant social awkwardness** and repetitive behaviors, which are not described in the child's presentation.
Question 5: A child with pervasive developmental disorder will have all of the following except:
- A. Stereotyped behaviour
- B. Reduced social interaction
- C. Poor language skills
- D. Impaired cognition (Correct Answer)
Explanation: ***Impaired cognition*** - While some individuals with **pervasive developmental disorders (PDDs)** may have comorbid intellectual disability, **impaired cognition is not a universal or defining characteristic** of PDDs. - Many individuals with PDDs, particularly those with **Asperger's syndrome**, have **average or above-average intelligence**. - Intelligence quotient (IQ) varies widely across the autism spectrum, making cognitive impairment a non-essential feature. *Stereotyped behaviour* - **Stereotyped and repetitive behaviors** (e.g., hand flapping, rocking, rigid adherence to routines) are a **core diagnostic criterion** for PDDs, including autism spectrum disorder. - These behaviors are part of the **restricted, repetitive patterns of behavior, interests, or activities** domain in diagnostic criteria. *Reduced social interaction* - Significant **deficits in social interaction and communication** are a **hallmark feature** of PDDs. - This manifests as difficulty with reciprocal social communication, impaired ability to interpret social cues, and challenges in forming age-appropriate peer relationships. *Poor language skills* - **Communication impairments**, including poor language skills, are a **common feature** of PDDs, especially in classical autism. - This can include delayed speech development, unusual language patterns (e.g., **echolalia**, pronoun reversal), or complete absence of verbal communication in severe cases.
Question 6: A 15-year-old adolescent is brought in for evaluation due to repeated failure to conform to social norms, deceitfulness, impulsivity, and lack of remorse. What is the most likely diagnosis?
- A. Conduct disorder (Correct Answer)
- B. Oppositional defiant disorder
- C. Intermittent explosive disorder
- D. Antisocial personality disorder
Explanation: ***Conduct disorder*** - This diagnosis is characterized by repeated patterns of behavior that **violate the rights of others** or major societal norms, consistent with the patient's presentation of **deceitfulness, impulsivity, and lack of remorse**. - For individuals under 18, it is the appropriate diagnosis, as **Antisocial Personality Disorder** cannot be diagnosed before turning 18. *Oppositional defiant disorder* - This condition involves a pattern of **angry/irritable mood, argumentative/defiant behavior**, or vindictiveness. It does not typically include the severe violations of societal norms or the rights of others seen in this case. - While there is defiance, it generally lacks the **aggression** towards people/animals, **destruction of property**, or **deceitfulness/theft** that characterize conduct disorder. *Intermittent explosive disorder* - This disorder is marked by **recurrent behavioral outbursts** representing a failure to control aggressive impulses. - The outbursts are typically **disproportionate** to the provocation but do not necessarily involve the persistent pattern of violating others' rights or societal rules as described. *Antisocial personality disorder* - This diagnosis requires an individual to be at least **18 years old** and have a history of conduct disorder symptoms before age 15. - Although the symptoms align with the criteria for **antisocial behavior**, the patient's age (15 years old) precludes this diagnosis.
Question 7: Which of the following is not a central characteristic of childhood autism?
- A. Callous and unemotional traits (Correct Answer)
- B. Impaired communication
- C. Restricted, repetitive behaviour
- D. Impaired social interaction
Explanation: ***Callous and unemotional traits*** - While some individuals with autism may struggle with empathy, **callous and unemotional traits** are not a core diagnostic feature of autism spectrum disorder (ASD); they are more commonly associated with conditions like **conduct disorder** or **antisocial personality disorder**. - **Emotional dysregulation** and **difficulty recognizing others' emotions** are common in autism, but this differs from a pervasive pattern of callousness. *Impaired communication* - **Impaired verbal and nonverbal communication** is a fundamental diagnostic criterion for autism spectrum disorder, ranging from absent speech to difficulties with conversations and understanding social cues. - This can manifest as problems with **initiating or maintaining conversations**, **lack of eye contact**, and **unusual tone of voice**. *Restricted, repetitive behaviour* - **Restricted, repetitive patterns of behavior, interests, or activities** are a core diagnostic feature of ASD. - Examples include **stereotyped motor movements**, **insistence on sameness**, **highly restricted or fixated interests**, and **unusual sensory sensitivities**. *Impaired social interaction* - **Persistent deficits in social communication and social interaction** across multiple contexts are defining characteristics of autism. - This includes difficulties with **social-emotional reciprocity**, **nonverbal communication**, and **developing, maintaining, and understanding relationships**.
Question 8: A 45-year-old male's blood test shows an increase in Homovanillic acid (HVA). Which of the following conditions is this finding most likely associated with?
- A. Phenylketonuria (PKU)
- B. Schizophrenia (Correct Answer)
- C. Depression
- D. Parkinson's disease
Explanation: **Explanation:** The correct answer is **Schizophrenia**. This question tests your knowledge of neurotransmitter metabolites and their clinical significance in psychiatric disorders. **1. Why Schizophrenia is correct:** **Homovanillic acid (HVA)** is the primary metabolic byproduct of **Dopamine**. According to the **Dopamine Hypothesis of Schizophrenia**, the disorder is characterized by dopaminergic hyperactivity, particularly in the mesolimbic pathway. Increased turnover of dopamine leads to elevated levels of HVA in the blood, cerebrospinal fluid (CSF), and urine. Monitoring HVA levels is often used in research to gauge central dopamine activity. **2. Why the other options are incorrect:** * **Phenylketonuria (PKU):** This is a metabolic disorder caused by a deficiency of phenylalanine hydroxylase. It leads to an accumulation of Phenylalanine, not HVA. * **Depression:** Depression is primarily associated with decreased levels of **5-HIAA** (5-Hydroxyindoleacetic acid), which is the metabolite of Serotonin. While dopamine can be involved, HVA is not a diagnostic marker for depression. * **Parkinson’s Disease:** This condition involves the degeneration of dopaminergic neurons in the substantia nigra. Therefore, one would expect a **decrease** in HVA levels due to dopamine deficiency, rather than an increase. **High-Yield Clinical Pearls for NEET-PG:** * **Dopamine → HVA** (Homovanillic Acid) * **Serotonin → 5-HIAA** (Decreased in suicide attempts and impulsive aggression) * **Norepinephrine → VMA** (Vanillylmandelic Acid) and **MHPG** (3-methoxy-4-hydroxyphenylglycol). * **VMA** is a crucial marker for diagnosing **Pheochromocytoma** and **Neuroblastoma**. * In Schizophrenia, HVA levels often correlate with the severity of positive symptoms (hallucinations/delusions).
Question 9: Increased suicidal tendency is associated with which neurochemical imbalance?
- A. Increased Noradrenaline
- B. Decreased Serotonin (Correct Answer)
- C. Decreased Dopamine
- D. Increased GABA
Explanation: **Explanation:** The neurobiology of suicidal behavior is most strongly linked to the **Serotonergic system**. Research consistently shows that low levels of **Serotonin (5-HT)** and its primary metabolite, **5-HIAA (5-hydroxyindoleacetic acid)**, in the cerebrospinal fluid (CSF) are associated with increased impulsivity, aggression, and completed suicide. This finding holds true across various psychiatric diagnoses, including depression and schizophrenia. **Analysis of Options:** * **Decreased Serotonin (Correct):** Low 5-HT levels in the ventromedial prefrontal cortex are linked to a failure in "top-down" inhibition, leading to impulsive-aggressive behaviors and suicidal acts. * **Increased Noradrenaline (Incorrect):** While noradrenergic dysregulation is seen in stress responses and anxiety disorders, it is not the primary neurochemical marker for suicidal tendency. * **Decreased Dopamine (Incorrect):** Low dopamine is primarily associated with anhedonia and motor symptoms (as seen in Parkinson’s or depression), but it is not as specific a predictor for suicide as serotonin. * **Increased GABA (Incorrect):** GABA is the brain's primary inhibitory neurotransmitter. Increased GABA activity is generally associated with sedation and reduced anxiety, not increased suicidality. **NEET-PG High-Yield Pearls:** * **CSF Marker:** The most high-yield fact is that **low CSF 5-HIAA** is the strongest biochemical predictor of violent suicide attempts. * **Post-mortem findings:** Studies of suicide victims often show decreased serotonin receptor binding in the prefrontal cortex. * **Genetics:** The Tryptophan Hydroxylase (TPH) gene mutation, which affects serotonin synthesis, is often studied in relation to suicidal behavior. * **Clinical Correlation:** Antidepressants (SSRIs) may initially increase the risk of suicide in young adults by increasing energy before improving mood (the "activation syndrome").
Question 10: Which of the following features is NOT commonly associated with 22q11.2 deletion syndrome?
- A. Mental retardation (Correct Answer)
- B. Schizophrenia
- C. ADHD
- D. Congenital heart defects
Explanation: **Explanation:** **22q11.2 Deletion Syndrome** (also known as DiGeorge or Velocardiofacial Syndrome) is the most common microdeletion syndrome in humans. The correct answer is **Mental retardation (Option A)** because, while patients frequently exhibit borderline intellectual functioning or learning disabilities, global "mental retardation" (moderate to severe intellectual disability) is **not** a defining or universal feature of the syndrome. Most patients have an IQ in the 70–85 range. **Analysis of Incorrect Options:** * **Schizophrenia (Option B):** This is a hallmark psychiatric association. Approximately 25–30% of individuals with this deletion develop schizophrenia, making it one of the strongest known genetic risk factors for the disorder. * **ADHD (Option C):** Neurodevelopmental disorders are highly prevalent; ADHD is the most common psychiatric diagnosis in children with 22q11.2 deletion, affecting roughly 30–40% of patients. * **Congenital heart defects (Option D):** These are classic physical manifestations, particularly conotruncal defects (e.g., Tetralogy of Fallot, interrupted aortic arch), occurring in about 75% of cases. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic (CATCH-22):** **C**ardiac defects, **A**bnormal facies, **T**hymic hypoplasia (T-cell deficiency), **C**left palate, **H**ypocalcemia (hypoparathyroidism), due to **22**q11 deletion. * **Psychiatry Link:** It is often tested as the "genetic link to schizophrenia." * **Diagnosis:** Confirmed via **FISH** (Fluorescence In Situ Hybridization) or chromosomal microarray. * **Key Gene:** The **TBX1** gene is primarily responsible for the physical phenotypes.
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