Environmental Influences on Development — MCQs

10 questions

TORCH infection most commonly causes:

Not true about thalidomide:

A 29 year old lady came to psychiatry OPD with symptoms of hypomania. She has a past history of manic episode. Now, she is planning to conceive. Which drug should be avoided for being highly teratogenic to the fetus?

Seal like limbs i.e. phocomelia is a specific side effect of -

An infant presents with hepatosplenomegaly and thrombocytopenia. Neuroimaging with CT shows periventricular calcifications. What is the most likely diagnosis?

Which of the following anti-epileptic drugs has the highest teratogenic potential?

Which of the following drugs is given during pregnancy, resulting in fetal abnormalities such as cleft lip and central nervous system defects?

A 7 weeks pregnant lady has 1 accidental exposure to x-ray. Which of the following should be done?

Which of the following is not a complication of Congenital Rubella Syndrome (CRS)?

Q10

24 yr old mother with 7 week POG presents to ANC OPD with accidental low-dose radiation exposure. What is the most appropriate immediate management?

Environmental Influences on Development Indian Medical PG Practice Questions and MCQs

Question 1: TORCH infection most commonly causes:

A. Active chorioretinitis
B. Retinal detachment
C. Salt-pepper retinopathy (Correct Answer)
D. Optic atrophy

Explanation: ***Salt-pepper retinopathy*** - **Salt-pepper retinopathy** is a classic ophthalmologic sign of congenital TORCH infections, particularly **rubella** and **cytomegalovirus (CMV)**, and is characterized by diffuse pigmentary changes in the retina. - This appearance results from widespread retinal pigment epithelial (RPE) damage leading to both areas of depigmentation (salt) and hyperpigmentation (pepper). *Active chorioretinitis* - While TORCH infections, especially **toxoplasmosis**, can cause **chorioretinitis**, the term "active" implies acute inflammation with visible lesions, whereas **salt-pepper retinopathy** is a more chronic, widespread pigmentary change indicating past damage. - Active chorioretinitis often presents with specific focal, exudative lesions, not the diffuse pigmentary mottling seen in salt-pepper retinopathy. *Retinal detachment* - **Retinal detachment** is a possibility in severe cases of congenital infections if there are extensive chorioretinal scars or vitreoretinal traction, but it is not the most common or characteristic ocular finding. - It is a more severe complication, not the primary and typically milder retinal manifestation commonly expected from TORCH infections. *Optic atrophy* - **Optic atrophy** can occur as a sequela of severe congenital infections due to direct involvement of the optic nerve or secondary to widespread retinal damage, but it is less common than the classic **salt-pepper retinopathy**. - It indicates chronic damage to the optic nerve fibers and typically presents with pallor of the optic disc, which is distinct from pigmentary changes in the retina.

Question 2: Not true about thalidomide:

A. Causes phocomelia
B. Still has restricted clinical use
C. Not tested in pregnant animals before introduction
D. Has no antiangiogenesis action against tumour (Correct Answer)

Explanation: ***Has no antiangiogenesis action against tumour*** - Thalidomide is known to possess **anti-angiogenic properties**, meaning it inhibits the formation of new blood vessels, which is crucial for tumour growth. This makes the statement "has no antiangiogenesis action against tumour" incorrect. - Its anti-angiogenic effects are one of the mechanisms proposed for its use in certain cancers, such as **multiple myeloma**. *Causes phocomelia* - **Phocomelia**, a severe birth defect characterized by malformed or absent limbs, is the most infamous **teratogenic effect** of thalidomide. - This adverse effect led to its withdrawal from the market in the early 1960s. *Still has restricted clinical use* - Despite its teratogenic risks, thalidomide has been reintroduced with strict regulations due to its unique immunomodulatory and anti-inflammatory properties. - It is currently used in the treatment of conditions like **multiple myeloma**, **erythema nodosum leprosum**, and certain autoimmune diseases. *Not tested in pregnant animals before introduction* - A significant reason for the thalidomide tragedy was the **lack of robust teratogenicity testing** in pregnant animals before its widespread introduction to the market. - If such testing had been adequately conducted, its severe teratogenic effects might have been identified earlier, preventing widespread harm.

Question 3: A 29 year old lady came to psychiatry OPD with symptoms of hypomania. She has a past history of manic episode. Now, she is planning to conceive. Which drug should be avoided for being highly teratogenic to the fetus?

A. Oxcarbazepine
B. Lithium
C. Olanzapine
D. Valproate (Correct Answer)

Explanation: ***Valproate*** - **Valproate** is highly **teratogenic** and is associated with multiple birth defects, including **neural tube defects** (e.g., spina bifida), cardiac anomalies, and craniofacial defects. - Due to its significant risks, it is generally **contraindicated** in women of childbearing potential, especially during pregnancy, unless no other suitable alternatives exist. *Oxcarbazepine* - While it has some teratogenic risk (e.g., cleft palate), the risk is generally considered **lower than valproate**. - It is often favored over valproate in pregnant women requiring mood stabilizers, but still requires careful risk-benefit assessment. *Lithium* - **Lithium** is associated with an increased risk of **Ebstein's anomaly**, a specific cardiac defect, if used during the first trimester. - However, the overall risk of major malformations is still **lower than valproate**, and it can be used with careful monitoring if other options are not viable. *Olanzapine* - **Olanzapine** is an **atypical antipsychotic** that can be used as a mood stabilizer and is considered to have a **relatively lower teratogenic risk** compared to anticonvulsants like valproate. - While it's not entirely risk-free (associated with gestational diabetes and fetal growth issues), it's often a safer option in pregnancy for bipolar disorder than valproate.

Question 4: Seal like limbs i.e. phocomelia is a specific side effect of -

A. Doxorubicin
B. Thalidomide (Correct Answer)
C. Cyclophosphamide
D. Terazosin

Explanation: ***Thalidomide*** - **Phocomelia**, characterized by severely shortened or absent limbs resembling those of a seal, is a classic and well-documented **teratogenic effect** of thalidomide. - This drug, when taken during early pregnancy (especially between weeks 4 and 8), disrupts limb bud development. *Doxorubicin* - **Doxorubicin** is an **anthracycline antibiotic** used in cancer chemotherapy, known for its significant **cardiotoxicity**, leading to dilated cardiomyopathy. - While it has various side effects, **phocomelia** is not a reported teratogenic effect of doxorubicin. *Cyclophosphamide* - **Cyclophosphamide** is an **alkylating agent** used in chemotherapy and immunosuppression, with notable side effects including **hemorrhagic cystitis** and **myelosuppression**. - Although it is a teratogen and can cause various fetal malformations, it is not specifically associated with **phocomelia**. *Terazosin* - **Terazosin** is an **alpha-1 blocker** primarily used to treat hypertension and benign prostatic hyperplasia (BPH). - Its main side effects include **orthostatic hypotension** and dizziness; it is not known to be teratogenic or associated with **phocomelia**.

Question 5: An infant presents with hepatosplenomegaly and thrombocytopenia. Neuroimaging with CT shows periventricular calcifications. What is the most likely diagnosis?

A. Congenital rubella syndrome
B. Congenital herpes simplex virus infection
C. Congenital toxoplasmosis
D. Congenital cytomegalovirus infection (Correct Answer)

Explanation: ***Congenital cytomegalovirus infection*** - **Periventricular calcifications** on neuroimaging are a classic and highly suggestive finding for congenital CMV infection. - **Hepatosplenomegaly** and **thrombocytopenia** are common systemic manifestations of congenital CMV, which can be severe. *Congenital rubella syndrome* - Rubella typically causes **sensorineural hearing loss**, ocular abnormalities (e.g., cataracts), and congenital heart defects (e.g., patent ductus arteriosus), rather than periventricular calcifications. - While hepatosplenomegaly and thrombocytopenia can occur, the specific brain calcification pattern points away from rubella. *Congenital herpes simplex virus infection* - HSV infection in neonates presents with a variety of symptoms, including skin vesicles, keratoconjunctivitis, and seizures. - Brain imaging often shows **focal necrosis** or **encephalitis**, not typically periventricular calcifications unless it's a very widespread and destructive process. *Congenital toxoplasmosis* - Congenital toxoplasmosis classic triad includes **chorioretinitis**, **hydrocephalus**, and **intracranial calcifications**, but these calcifications are typically scattered or diffuse rather than strictly periventricular. - While hepatosplenomegaly and thrombocytopenia can be present, the specific location of calcifications is a key differentiating factor.

Question 6: Which of the following anti-epileptic drugs has the highest teratogenic potential?

A. Carbamazepine
B. Phenytoin
C. Valproate (Correct Answer)
D. Lamotrigine

Explanation: ***Correct: Valproate*** - **Valproate has the highest teratogenic potential** among all anti-epileptic drugs, with a **10-20% risk of major congenital malformations** - **Neural tube defects** (spina bifida) occur in **1-2% of exposed pregnancies**, which is 10-20 times higher than the general population - Other significant risks include **cardiac malformations, craniofacial abnormalities**, and **neurodevelopmental disorders** (autism spectrum disorder, reduced IQ) - **Fetal valproate syndrome** is a recognized clinical entity - Current guidelines strongly recommend **avoiding valproate in women of childbearing potential** unless no alternatives exist *Incorrect: Carbamazepine* - Has teratogenic risks but significantly **lower than valproate** (2-5% risk of major malformations) - Associated with **neural tube defects** (0.5-1% risk, lower than valproate) - Considered a safer alternative when valproate must be avoided *Incorrect: Phenytoin* - Causes **fetal hydantoin syndrome** with characteristic features: craniofacial anomalies, nail/digital hypoplasia, growth restriction, and developmental delay - Teratogenic risk is **moderate** (approximately 5-10% risk of major malformations) - Risk is significant but **lower than valproate** *Incorrect: Lamotrigine* - Considered **one of the safest anti-epileptic drugs** during pregnancy - Low teratogenic risk with **major malformation rate of 2-3%** (close to baseline population risk) - Slight increased risk of **oral clefts** at higher doses - **Preferred choice** for women of childbearing potential requiring anti-epileptic therapy

Question 7: Which of the following drugs is given during pregnancy, resulting in fetal abnormalities such as cleft lip and central nervous system defects?

A. Warfarin
B. Phenytoin
C. Valproic acid
D. Retinoic acid (Vitamin A derivative) (Correct Answer)

Explanation: ***Retinoic acid (Vitamin A derivative)*** - **Retinoic acid** (including isotretinoin) is a **potent teratogen** with a characteristic pattern of malformations including **craniofacial defects (cleft lip/palate)**, **cardiac abnormalities** (transposition of great arteries, VSD), and **severe CNS defects** (hydrocephalus, microcephaly, neural tube defects) - The mechanism involves **disruption of gene expression** during embryogenesis, particularly affecting **neural crest cell migration** critical for facial and cardiac development - The combination of **cleft lip + CNS defects** is characteristic of retinoic acid embryopathy, making it the most fitting answer *Phenytoin* - **Phenytoin** causes **fetal hydantoin syndrome** with craniofacial anomalies (cleft lip/palate in ~5-10% of cases), **hypoplastic nails and distal phalanges**, wide-set eyes, and mild developmental delays - While cleft lip can occur, the overall pattern emphasizes **digital/nail hypoplasia** and milder CNS effects compared to retinoic acid *Valproic acid* - **Valproic acid** is primarily associated with **neural tube defects** (spina bifida in 1-2% of exposures), the hallmark of valproate embryopathy - Can cause minor facial anomalies and cardiac defects, but the **characteristic feature is spina bifida**, not cleft lip *Warfarin* - **Warfarin** causes **fetal warfarin syndrome** with distinctive features: **nasal hypoplasia**, **stippled epiphyses** (chondrodysplasia punctata), and potential CNS defects from hemorrhage - Does **not** typically cause cleft lip; the skeletal abnormalities are the defining feature

Question 8: A 7 weeks pregnant lady has 1 accidental exposure to x-ray. Which of the following should be done?

A. Continue the pregnancy with monitoring (Correct Answer)
B. Perform chromosome analysis if needed
C. Conduct pre-invasive diagnostic testing if indicated
D. Consider termination of pregnancy

Explanation: ***Continue the pregnancy with monitoring*** - The risk of **fetal malformation** and **intellectual disability** from a single diagnostic X-ray exposure is generally considered very low, often below the threshold for clinical concern. - Current guidelines typically recommend continuing pregnancy with routine monitoring unless the estimated fetal dose exceeds a certain threshold (e.g., 50-100 mGy), which is unlikely with a single accidental exposure. *Perform chromosome analysis if needed* - **Chromosome analysis** is generally reserved for cases with suspected genetic anomalies or significant fetal exposure to radiation at doses known to induce chromosomal damage. - A single, accidental X-ray exposure is unlikely to cause clinically significant chromosomal aberrations requiring such invasive testing. *Conduct pre-invasive diagnostic testing if indicated* - **Pre-invasive diagnostic testing**, such as nuchal translucency scans or maternal serum screening, assesses risks for common aneuploidies and neural tube defects, not typically direct radiation effects. - While these tests are part of routine prenatal care, a single X-ray exposure does not, by itself, create a specific indication for additional pre-invasive testing beyond standard recommendations. *Consider termination of pregnancy* - **Termination of pregnancy** is usually considered only in cases of significant, confirmed fetal harm or very high radiation doses that unequivocally increase the risk of severe birth defects or intellectual disability. - A single accidental X-ray exposure almost certainly does not meet this threshold, as the associated risks to the fetus are minimal.

Question 9: Which of the following is not a complication of Congenital Rubella Syndrome (CRS)?

A. Retinopathy
B. Cardiac abnormalities
C. Macrocephaly (Correct Answer)
D. Spontaneous abortion

Explanation: ***Macrocephaly*** - While CRS can lead to various neurological complications, **macrocephaly** (abnormally large head circumference) is not a typical manifestation of the syndrome. Neurological issues in CRS more commonly involve **microcephaly** due to brain damage. - Other common neurological complications include **meningoencephalitis** and developmental delays, but not an enlarged head. *Retinopathy* - **Pigmentary retinopathy** (salt-and-pepper retinopathy) is a classic ocular manifestation of CRS, often present at birth. - This is a direct consequence of the rubella virus affecting the developing retinal structures. *Spontaneous abortion* - Maternal rubella infection, especially during the **first trimester**, carries a significant risk of **spontaneous abortion** due to severe fetal damage. - The virus's teratogenic effects can be so profound that the fetus is not viable. *Cardiac abnormalities* - **Congenital heart defects** are a hallmark of CRS, with **patent ductus arteriosus (PDA)** and **pulmonary artery stenosis** being the most common. - These abnormalities result from the rubella virus interfering with normal cardiac development during embryogenesis.

Question 10: 24 yr old mother with 7 week POG presents to ANC OPD with accidental low-dose radiation exposure. What is the most appropriate immediate management?

A. Reassure and continue pregnancy (Correct Answer)
B. Perform detailed fetal anomaly scan
C. Advise medical termination of pregnancy
D. Advise genetic counseling and testing

Explanation: ***Reassure and continue pregnancy*** - **Low-dose radiation exposure** (typically defined as <50 mGy) during pregnancy is generally associated with a very low risk of fetal anomalies or adverse outcomes. The patient should be reassured that the risk to the fetus is minimal. - The threshold for concern for teratogenic effects from radiation is significantly higher than a low dose, and **medical termination of pregnancy** is not indicated in such cases. - This is the most appropriate **immediate management** for accidental low-dose radiation exposure at 7 weeks gestation. *Perform detailed fetal anomaly scan* - While anomaly scans are part of routine prenatal care, performing an immediate, detailed scan solely due to **low-dose radiation exposure** at 7 weeks is not the most appropriate *immediate* management. The risk of anomalies from such exposure is extremely low and unlikely to be detectable at 7 weeks. - A more detailed scan may be considered at later gestational ages (e.g., 18-20 weeks) as part of standard care, but not as an emergency response to low-dose exposure. *Advise medical termination of pregnancy* - Medical termination is **not indicated** for accidental **low-dose radiation exposure**. Termination is only considered in cases of *extremely high* and confirmed doses (e.g., >100 mGy), which carry a significant risk of severe fetal anomalies or mortality. - Such high doses are rare in accidental exposures and would necessitate a thorough dose assessment by a radiation physicist before considering any drastic measures. - Since the scenario specifies low-dose exposure, termination would be inappropriate and potentially harmful counseling. *Advise genetic counseling and testing* - **Genetic counseling** and testing would be indicated for known genetic risks, advanced maternal age, or suspicion of chromosomal abnormalities, none of which are suggested by accidental **low-dose radiation exposure**. - Radiation-induced effects are typically teratogenic rather than directly causing inheritable genetic mutations that would be detected by standard genetic testing.

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