Schizophrenia: Epidemiology and Etiology — MCQs
Increased dopamine levels are associated with which of the following conditions?
What is the concordance rate for schizophrenia in monozygotic twins?
In which socioeconomic strata is schizophrenia most commonly observed?
Which of the following is considered a poor prognostic factor for schizophrenia?
Which of the following is false about bipolar disorder?
Which of the following is considered a poor prognostic factor for schizophrenia?
Which of the following factors is least likely to be associated with suicidal tendencies?
Consanguineous marriages increase the risk of which of the following diseases?
A 45-year-old female presents to the OPD with complaints of "feeling tense" and experiencing stomach upset with heartburn and diarrhea. She reports having these symptoms for many years and mentions that her family members also usually feel tense and nervous. Which of the following symptoms is most likely to be seen in this patient?
Which of the following conditions does not typically involve delusions?
Schizophrenia: Epidemiology and Etiology Indian Medical PG Practice Questions and MCQs
Question 1: Increased dopamine levels are associated with which of the following conditions?
- A. Depression
- B. Mania
- C. Delirium
- D. Schizophrenia (Correct Answer)
Explanation: ***Schizophrenia*** - The **dopamine hypothesis of schizophrenia** is the most well-established association with increased dopamine levels, particularly in the **mesolimbic pathway**, which contributes to positive symptoms such as **hallucinations** and **delusions**. - Antipsychotic medications, which are **dopamine D2 receptor antagonists**, effectively reduce these positive symptoms by blocking dopamine activity. - This is the **classic and primary answer** when considering increased dopamine levels in psychiatry. *Depression* - Depression is primarily associated with **decreased levels of monoamines**, including **serotonin**, **norepinephrine**, and **dopamine**. - Treatments for depression often aim to increase these neurotransmitter levels, not related to dopamine excess. *Mania* - Mania, a hallmark of **bipolar disorder**, is associated with **increased dopamine activity** along with elevated **norepinephrine** and **serotonin** levels. - While mania does involve dopamine elevation, **schizophrenia** remains the **primary and most established** condition associated with the dopamine hypothesis in psychiatric literature. - The distinction is that schizophrenia's pathophysiology is more centrally and specifically linked to dopamine dysregulation. *Delirium* - Delirium is a state of **acute brain failure** characterized by a fluctuating course and disturbances in attention and cognition. - While neurotransmitter imbalances, including dopamine, **acetylcholine deficiency**, and GABA alterations, can contribute to delirium, it is not primarily defined by increased dopamine as the main pathophysiological mechanism.
Question 2: What is the concordance rate for schizophrenia in monozygotic twins?
- A. 1%
- B. 10%
- C. 50% (Correct Answer)
- D. 0.10%
Explanation: ***50%*** - The **concordance rate** for schizophrenia in **monozygotic (identical) twins** is approximately **50%**. - This high concordance rate indicates a strong **genetic predisposition** but also highlights the role of **environmental factors**, as it is not 100%. *1%* - A 1% risk is closer to the **general population prevalence** of schizophrenia, not the concordance rate in monozygotic twins. - This low percentage would significantly underestimate the genetic component observed in twin studies for schizophrenia. *10%* - A 10% concordance rate is a significant increase over the general population risk but is still substantially lower than what has been consistently found in studies of monozygotic twins. - This percentage might be more aligned with the risk for first-degree relatives or dizygotic twins, not identical twins. *0.10%* - A 0.10% concordance rate is an extremely low figure, far below the actual observed rate for monozygotic twins. - Such a low percentage would suggest virtually no genetic influence on schizophrenia, which contradicts extensive research findings.
Question 3: In which socioeconomic strata is schizophrenia most commonly observed?
- A. Middle
- B. Upper
- C. Low (Correct Answer)
- D. Upper middle
Explanation: ***Low*** - Epidemiological studies consistently show a **higher prevalence of schizophrenia** in individuals from **lower socioeconomic strata**. - This association is explained by the "**social drift**" hypothesis, where individuals with schizophrenia experience a decline in social class due to the chronic and disabling nature of the illness, or the "**social causation**" hypothesis, which posits that adverse social conditions contribute to the development of the disorder. *Middle* - While individuals from all socioeconomic backgrounds can develop schizophrenia, it is **less common** compared to the lowest strata. - The middle socioeconomic group generally experiences **better access to resources** and support systems, which may mitigate some risk factors. *Upper* - Schizophrenia is **least common** in the upper socioeconomic strata. - Individuals in this group typically have **greater financial stability**, better living conditions, and access to high-quality healthcare, which might protect against environmental stressors. *Upper middle* - Similar to the middle and upper strata, the upper-middle class experiences a **lower prevalence of schizophrenia** compared to the low socioeconomic group. - This group often benefits from **good educational opportunities** and stable employment, reducing some of the psychosocial stressors associated with the disorder.
Question 4: Which of the following is considered a poor prognostic factor for schizophrenia?
- A. Presence of depression
- B. Presence of stressor
- C. Early onset (Correct Answer)
- D. Female sex
Explanation: ***Early onset*** - An **earlier age of onset** (e.g., childhood or early adolescence) for schizophrenia is consistently associated with a **worse long-term prognosis**, including more severe symptoms, greater functional impairment, and a lower likelihood of full recovery. - This is thought to be due to the greater developmental disruption caused by the illness when it begins at a younger age. *Presence of depression* - While depression is common in schizophrenia, it is generally considered to be a **treatable co-occurring condition** rather than a primary poor prognostic factor for the core psychotic disorder itself. - Effective treatment for depression can actually **improve overall quality of life** and adherence to antipsychotic medication. *Presence of stressor* - The presence of a significant psychosocial stressor at the onset of schizophrenia is often associated with a **better prognosis**, as it suggests a more reactive and potentially remitting course. - This indicates that the illness might be more environmentally triggered and less intrinsically severe. *Female sex* - **Female sex** is typically associated with a **somewhat better prognosis** in schizophrenia, with a later age of onset and potentially less severe symptoms compared to males. - This may be influenced by hormonal factors and differences in social support networks.
Question 5: Which of the following is false about bipolar disorder?
- A. Unipolar mania is more common than bipolar disorder (Correct Answer)
- B. Genetic factors play important role
- C. Rapid cycling is more common in females
- D. Age of onset is earlier than unipolar depression
Explanation: ***Unipolar mania is more common than bipolar disorder*** - This statement is **false** because **unipolar mania is extremely rare**, while **bipolar disorder (which includes both manic and depressive episodes)** is significantly more common. - **Unipolar mania** refers to recurrent manic episodes without any depressive episodes, a presentation that is seldom observed clinically. *Genetic factors play important role* - This statement is **true**, as **bipolar disorder has a strong genetic component**, with **heritability estimated between 60-80%**. - **First-degree relatives** of individuals with bipolar disorder are at a significantly higher risk of developing the condition. *Rapid cycling is more common in females* - This statement is **true**; **rapid cycling (4 or more mood episodes per year)** occurs more frequently in females with bipolar disorder. - **Women with bipolar disorder** are also more likely to experience **mixed features** and **more depressive episodes** compared to males. *Age of onset is earlier than unipolar depression* - This statement is **true** because the **typical age of onset for bipolar disorder is in early adulthood (late teens to early 20s)**, whereas **unipolar depression often has a later average onset**, though both can occur at any age. - An earlier age of onset in bipolar disorder is linked to poorer prognosis and more severe illness course.
Question 6: Which of the following is considered a poor prognostic factor for schizophrenia?
- A. Poor premorbid adjustment (Correct Answer)
- B. Male sex
- C. Presence of depression
- D. Blunted affect
Explanation: **Poor premorbid adjustment** - **Poor premorbid adjustment**, indicated by difficulties in social, academic, or occupational functioning before the onset of psychosis, is a consistent predictor of a worse outcome in schizophrenia. - This suggests a more pervasive and entrenched neurodevelopmental vulnerability impacting the individual's ability to cope and integrate socially. *Blunted affect (negative symptom)* - While **blunted affect** is a negative symptom often associated with poorer outcomes than positive symptoms, it is typically considered a *symptom* of the illness rather than a primary prognostic *factor* like premorbid adjustment. - Its presence contributes to disability, but it is not as strong an independent prognostic indicator as the life trajectory prior to illness onset. *Male sex (generally poorer prognosis)* - **Male sex** is generally associated with an **earlier age of onset** and often a **more severe course** of schizophrenia. - However, compared to significant functional impairment before disease onset, it is not as strong an individual predictor of overall long-term prognosis. *Presence of depression (often associated with better outcomes)* - The **presence of depressive symptoms** in schizophrenia is often associated with a **better prognosis**. - This is because depressive features can sometimes indicate a more preserved capacity for emotional experience and insight, which can align with higher functioning.
Question 7: Which of the following factors is least likely to be associated with suicidal tendencies?
- A. Social isolation
- B. Mental health issues
- C. Gender
- D. Being married (Correct Answer)
Explanation: ***Being married*** - Marriage, particularly a strong and supportive relationship, is often considered a **protective factor** against suicidal ideation and acts. - The presence of a partner and shared responsibilities can provide a sense of **belonging** and **purpose**, reducing feelings of hopelessness. *Social isolation* - **Lack of social support** and feelings of loneliness significantly increase the risk of suicidal thoughts and behaviors. - Individuals who feel isolated may experience a deeper sense of **despair** and have fewer resources to cope with stress. *Mental health issues* - Conditions like **depression**, **bipolar disorder**, **schizophrenia**, and **anxiety disorders** are strong risk factors for suicidal tendencies. - These illnesses often lead to severe emotional distress, impaired judgment, and feelings of worthlessness. *Gender* - While women are more likely to attempt suicide, **men are more likely to die by suicide**, using more lethal means. - This difference indicates that gender is a significant factor in the **epidemiology** and presentation of suicidal behaviors, not a protective one.
Question 8: Consanguineous marriages increase the risk of which of the following diseases?
- A. Autosomal dominant diseases
- B. Autosomal recessive diseases (Correct Answer)
- C. X linked dominant diseases
- D. Environmental diseases
Explanation: ***Autosomal recessive diseases*** - Consanguineous marriages increase the likelihood of offspring inheriting two copies of a **recessive deleterious allele** from a common ancestor. - This significantly raises the risk of expressing **autosomal recessive conditions**, as both parents are more likely to be carriers of the same rare recessive gene. - Examples include **thalassemia, sickle cell disease, and cystic fibrosis**. *Autosomal dominant diseases* - These diseases manifest with only **one copy of the mutated allele**, regardless of consanguinity. - The risk is primarily linked to whether one parent carries the dominant gene, not the relatedness of the parents. *X linked dominant diseases* - These conditions are caused by mutations on the **X chromosome** and are expressed dominantly. - Consanguinity does not specifically increase the risk, as the disease manifests when the mutated X-linked gene is inherited from an affected parent. - The inheritance pattern depends on the affected parent's sex, not on parental relatedness. *Environmental diseases* - These diseases are primarily caused by **external factors** such as toxins, diet, lifestyle choices, or infections. - While genetic predisposition may play a role, consanguinity does not directly increase the risk for environmentally triggered diseases.
Question 9: A 45-year-old female presents to the OPD with complaints of "feeling tense" and experiencing stomach upset with heartburn and diarrhea. She reports having these symptoms for many years and mentions that her family members also usually feel tense and nervous. Which of the following symptoms is most likely to be seen in this patient?
- A. Ideas of reference
- B. Tingling of extremities (Correct Answer)
- C. Hallucination
- D. Neologism
Explanation: ***Tingling of extremities*** - The patient's presentation of "feeling tense," **stomach upset, heartburn, and diarrhea** for many years, alongside a family history of similar issues, suggests significant **anxiety**. - **Peripheral neurological symptoms** such as **tingling of extremities (paresthesia)** are common manifestations of anxiety and panic attacks due to **hyperventilation** (causing respiratory alkalosis and decreased ionized calcium) and **physiological arousal**. *Ideas of reference* - **Ideas of reference** are typically seen in **psychotic disorders** (e.g., schizophrenia) where a person believes that unrelated, external events have a special, personal meaning. - While anxiety can sometimes lead to misinterpretations, **ideas of reference** at a delusional level are not characteristic of generalized anxiety. *Hallucination* - **Hallucinations** are perceptual disturbances where an individual experiences sensory perceptions (e.g., hearing voices, seeing things) in the absence of an external stimulus. - These are core symptoms of **psychotic disorders** and are not typical findings in anxiety disorders without comorbid conditions. *Neologism* - A **neologism** is the coining of new words or phrases, often without clear meaning, which is a hallmark feature of disorganized thought in **psychotic disorders** (e.g., schizophrenia). - This symptom is related to severe thought disorganization and is not associated with anxiety disorders.
Question 10: Which of the following conditions does not typically involve delusions?
- A. Delirium
- B. Alcohol withdrawal
- C. OCD (Correct Answer)
- D. Schizophrenia
Explanation: ***OCD*** - **Obsessive-compulsive disorder** is characterized by recurrent, intrusive **thoughts (obsessions)** and repetitive **behaviors (compulsions)**, which the individual typically recognizes as irrational. - While patients with severe OCD may have **poor insight**, they generally do not experience **delusions**, which are fixed, false beliefs held despite evidence to the contrary. *Delirium* - **Delirium** is an acute, fluctuating disturbance of consciousness resulting from medical conditions or substance intoxication/withdrawal, often accompanied by **psychotic symptoms** including **delusions** and **hallucinations**. - The rapid onset and global cognitive impairment make **delusions** a common feature. *Schizophrenia* - **Schizophrenia** is a severe mental disorder characterized by **psychotic symptoms**, with **delusions** being one of the hallmark positive symptoms. - These **delusions** often include **persecutory**, **grandiose**, or **somatic themes**, among others. *Alcohol withdrawal* - Severe **alcohol withdrawal** can lead to **delirium tremens (DTs)**, which is associated with **psychotic symptoms** such as **delusions** and vivid **hallucinations** (often visual or tactile). - These **delusions** are often **persecutory** or referential in nature and contribute to the patient's fear and agitation.
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