Community Medicine
4 questionsWhat is the significance of a 2-year post-treatment surveillance period in paucibacillary leprosy?
According to WHO guidelines, what prevalence of Bitot's spots indicates a public health problem?
Schistosomiasis is transmitted by?
What is the osmolarity of the new Oral Rehydration Solution (ORS)?
NEET-PG 2012 - Community Medicine NEET-PG Practice Questions and MCQs
Question 501: What is the significance of a 2-year post-treatment surveillance period in paucibacillary leprosy?
- A. To monitor for treatment compliance during active therapy
- B. To assess the effectiveness of multibacillary leprosy treatment protocols
- C. To detect early signs of drug resistance in ongoing treatment
- D. To identify relapses, reactions, and neurological complications after treatment completion (Correct Answer)
Explanation: ***To identify relapses, reactions, and neurological complications after treatment completion*** - The 2-year post-treatment surveillance period for **paucibacillary leprosy** is crucial for monitoring for **relapses** which can occur even after successful multidrug therapy (MDT). - It also allows for the early detection and management of **leprosy reactions** (e.g., Type 1 reversal reactions) and **neurological complications** such as nerve damage, which can develop or progress after treatment completion. *To monitor for treatment compliance during active therapy* - Monitoring for **treatment compliance** occurs *during* the active 6-month MDT period for paucibacillary leprosy, not primarily in the 2-year post-treatment surveillance phase. - While compliance is essential for successful treatment, the post-treatment period is focused on after-effects. *To assess the effectiveness of multibacillary leprosy treatment protocols* - This surveillance period is specifically for **paucibacillary leprosy**, which has a different treatment regimen and surveillance duration (6 months MDT followed by 2 years surveillance) compared to multibacillary leprosy (12 months MDT followed by 5 years surveillance). - The effectiveness of multibacillary treatment protocols would be assessed over a longer period following completion of its own specific MDT. *To detect early signs of drug resistance in ongoing treatment* - Detection of **drug resistance** is typically assessed *during* treatment if a patient is not responding clinically or shows signs of worsening, or in cases of relapse where drug resistance might be suspected as the cause. - While possible, the primary purpose of post-treatment surveillance is broader than just drug resistance; it encompasses all potential adverse long-term outcomes.
Question 502: According to WHO guidelines, what prevalence of Bitot's spots indicates a public health problem?
- A. > 1% prevalence
- B. > 2% prevalence
- C. None of the options
- D. ≥ 0.5% prevalence (Correct Answer)
Explanation: ***≥ 0.5% prevalence*** - According to **WHO guidelines**, a prevalence of Bitot's spots of **≥ 0.5%** (greater than or equal to 0.5%) in children aged 6-71 months indicates a **moderate public health problem** related to **vitamin A deficiency**. - This threshold is used for **programmatic decision-making** and intervention strategies to combat **xerophthalmia** (vitamin A deficiency eye disease). - At **≥ 1.0%** prevalence, it indicates a **severe public health problem**. *> 1% prevalence* - While ≥ 1% prevalence indicates a **severe public health problem**, the **initial WHO threshold** for identifying a public health problem due to **vitamin A deficiency** as indicated by Bitot's spots is **≥ 0.5%**. - This allows for **earlier public health action** before the situation becomes severe. *> 2% prevalence* - A prevalence of 2% implies a **critical vitamin A deficiency situation**, far exceeding the **WHO's diagnostic threshold** for initiating public health interventions. - Interventions would be critically urgent at this level, but the criteria for recognizing a problem are met at **≥ 0.5%**. *None of the options* - This option is incorrect because the **WHO has specific guidelines** for the prevalence of **Bitot's spots** that indicate a public health problem. - The correct threshold of **≥ 0.5%** is provided among the choices, which is the established criterion for a **moderate public health problem**.
Question 503: Schistosomiasis is transmitted by?
- A. Fish
- B. Snail (Correct Answer)
- C. Cattle
- D. Cyclops
Explanation: ***Snail*** - **Snails** act as the **intermediate host** for all species of Schistosoma, where the parasite undergoes asexual reproduction. - Humans become infected when they come into contact with water contaminated with **cercariae**, which are released from infected snails. *Cyclops* - **Cyclops** (a type of freshwater crustacean) are the intermediate hosts for parasites like **Dracunculus medinensis** (guinea worm) and **Diphyllobothrium latum** (fish tapeworm). - They are not involved in the life cycle or transmission of Schistosoma. *Fish* - Various fish can be intermediate hosts for parasites such as **Clonorchis sinensis** (Chinese liver fluke) or **Diphyllobothrium latum**. - Fish do not play a role in the transmission of schistosomiasis. *Cattle* - **Cattle** can serve as definitive hosts for certain parasites, such as **Taenia saginata** (beef tapeworm), where the larval stage (cysticerci) is found in their muscle tissue. - They are not involved in the life cycle or transmission of Schistosoma.
Question 504: What is the osmolarity of the new Oral Rehydration Solution (ORS)?
- A. 270
- B. 245 (Correct Answer)
- C. 290
- D. 310
Explanation: ***245*** - The **new ORS (reduced osmolarity ORS)** has an osmolarity of **245 mOsmol/L**. - This reduced osmolarity formulation has been shown to be more effective in reducing stool output, vomiting, and duration of diarrhea compared to the standard ORS. *270* - While 270 mOsmol/L is closer to the target, it is not the exact osmolarity of the **new ORS formulation**. - The precise osmolarity of the new ORS is specifically designed for optimal water and electrolyte absorption. *290* - The **standard (or traditional) ORS** had an osmolarity of **310 mOsmol/L**, which is higher than 290 mOsmol/L. - An osmolarity of 290 mOsmol/L does not correspond to a recognized standard or new ORS formulation. *310* - The **standard (or traditional) ORS** formulation had an osmolarity of **310 mOsmol/L**. - The move to a new ORS with reduced osmolarity was to improve efficacy and reduce the risk of hypernatremia in some patients.
Internal Medicine
1 questionsWhat is the primary electrolyte found in Oral Rehydration Salts (ORS) at a concentration of 75 mEq/L?
NEET-PG 2012 - Internal Medicine NEET-PG Practice Questions and MCQs
Question 501: What is the primary electrolyte found in Oral Rehydration Salts (ORS) at a concentration of 75 mEq/L?
- A. Sodium (Correct Answer)
- B. Potassium
- C. Glucose
- D. Chloride
Explanation: ***Sodium*** - The primary electrolyte in **Oral Rehydration Salts (ORS)** is **sodium**, which is crucial for replacing losses due to diarrhea and facilitating water absorption in the intestines [1]. - The standard ORS formulation, recommended by the WHO, contains **75 mEq/L of sodium** to effectively rehydrate individuals with acute watery diarrhea [1]. *Potassium* - While **potassium** is an essential electrolyte found in ORS, its concentration is typically lower than sodium, usually around **20 mEq/L**. - Potassium helps replenish intracellular losses and supports normal cellular function, but it is not the primary electrolyte at the 75 mEq/L concentration. *Glucose* - **Glucose** is a crucial component of ORS, but it is a sugar, not an electrolyte. - Its role is to facilitate the co-transport of **sodium and water** across the intestinal wall, enhancing fluid absorption, but it does not contribute to the electrolyte concentration in mEq/L [1]. *Chloride* - **Chloride** is an electrolyte present in ORS, primarily to balance the charge of **sodium** and prevent hyynatremia. - Its concentration is typically around **65 mEq/L**, making it slightly less concentrated than sodium but still vital for maintaining electrolyte balance.
Microbiology
1 questionsWhich of the following statements about trematodes is true?
NEET-PG 2012 - Microbiology NEET-PG Practice Questions and MCQs
Question 501: Which of the following statements about trematodes is true?
- A. Segmented
- B. Anus present
- C. Body cavity present
- D. Two hosts required (Correct Answer)
Explanation: ***Two hosts required (Correct)*** - Trematodes typically require at least **two hosts** to complete their life cycle: an intermediate host (usually a **snail**) and a definitive host (a vertebrate). - This complex lifecycle involving multiple hosts is a characteristic feature of **flukes**. - This is a fundamental distinguishing feature that separates trematodes from some other helminths. *Segmented (Incorrect)* - Trematodes (flukes) have **unsegmented, leaf-shaped or cylindrical bodies**, unlike cestodes (tapeworms) which are segmented. - The absence of body segmentation is a key morphological distinction from other helminths. *Anus present (Incorrect)* - Trematodes have an **incomplete digestive system** with a mouth and an esophagus, but **no anus**. - Waste products are expelled back through the **mouth**. - This blind-ending gut is characteristic of the class Trematoda. *Body cavity present (Incorrect)* - Trematodes are **acoelomates**, meaning they lack a true fluid-filled body cavity (coelom). - Their internal organs are embedded in **parenchymatous tissue** filling the space between body wall and organs.
Obstetrics and Gynecology
1 questionsIn which period is maternal mortality highest?
NEET-PG 2012 - Obstetrics and Gynecology NEET-PG Practice Questions and MCQs
Question 501: In which period is maternal mortality highest?
- A. Antepartum
- B. Peripartum (Correct Answer)
- C. Postpartum
- D. No period of maximum risk
Explanation: ***Peripartum*** - The peripartum period encompasses the time immediately before, during, and after childbirth, when the risks of **hemorrhage, infection, pre-eclampsia/eclampsia**, and other **acute obstetric complications** are highest. - The **physiological stresses** of labor and delivery, coupled with potential complications like **uterine atony** or **obstructed labor**, contribute significantly to maternal mortality during this critical window [2]. *Antepartum* - While complications like **severe pre-eclampsia, ectopic pregnancy**, and chronic conditions can occur during the antepartum period, the **acute risks of hemorrhage and infection** are generally lower than during and immediately after delivery [1]. - Most maternal deaths occurring antepartum are due to conditions that ultimately lead to or manifest more severely during the peripartum or postpartum phases, such as undetected pre-eclampsia worsening to eclampsia [3]. *Postpartum* - The postpartum period (especially the first 42 days) also carries significant risks such as **late postpartum hemorrhage, puerperal sepsis, and thromboembolism** [2]. - While substantial, the **magnitude of mortality risk** primarily due to acute events related to labor and delivery (e.g., massive hemorrhage, amniotic fluid embolism) is often concentrated in the peripartum period [2]. *No period of maximum risk* - This statement is incorrect because maternal mortality risk is demonstrably **higher during specific periods** related to pregnancy and childbirth, rather than being evenly distributed [1]. - The physiological changes and obstetric challenges associated with gestation, labor, and the puerperium create distinct periods of elevated risk for maternal morbidity and mortality.
Ophthalmology
3 questionsJack in box scotoma is seen after correction of Aphakia by?
What is the most common complication of pars planitis?
Which of the following statements about corneal dystrophy is true?
NEET-PG 2012 - Ophthalmology NEET-PG Practice Questions and MCQs
Question 501: Jack in box scotoma is seen after correction of Aphakia by?
- A. IOL
- B. Spectacles (Correct Answer)
- C. Contact lens
- D. None of the options
Explanation: ***Spectacles*** - **Jack-in-the-box scotoma** describes a visual phenomenon where objects appear to jump into and out of the field of vision. This occurs due to the **peripheral scotoma** and **ring scotoma** created by high-plus aphakic spectacle lenses. - Aphakic spectacles cause significant **magnification of the central visual field** (about 25-30%) and a corresponding minification/displacement of the peripheral field, leading to areas where objects are transiently obscured or reappear. *IOL* - An **intraocular lens (IOL)** replaces the natural lens within the eye, providing a much more stable and centered optical correction. - IOLs generally do not cause significant magnification changes or the peripheral scotoma associated with aphakic spectacles. *Contact lens* - **Contact lenses** sit directly on the cornea, offering a visual correction that is much closer to the nodal point of the eye than spectacles. - This placement results in less peripheral distortion and magnification compared to spectacles, making jack-in-the-box scotoma unlikely. *None of the options* - As **aphakic spectacles** are known to cause jack-in-the-box scotoma, this option is incorrect.
Question 502: What is the most common complication of pars planitis?
- A. Cataract (clouding of the lens) (Correct Answer)
- B. Retinal detachment (separation of retina)
- C. Cystoid macular edema (swelling of central retina)
- D. Glaucoma (increased intraocular pressure)
Explanation: **Cataract (clouding of the lens)** - **Cataract formation** is the most common ocular complication in patients with pars planitis, often due to chronic inflammation or steroid use. - The inflammation can disrupt lens metabolism, leading to **opacification** over time. *Retinal detachment (separation of retina)* - While possible, **retinal detachment** is a less common complication of pars planitis compared to cataract formation. - It can occur in severe cases, often due to vitreous traction on fragile peripheral retina or tears associated with **snowbanking**. *Cystoid macular edema (swelling of central retina)* - **Cystoid macular edema (CME)** is a significant cause of vision loss in pars planitis but is not the most frequent complication overall. - It results from the inflammatory compromise of the blood-retinal barrier, leading to fluid accumulation in the **macula**. *Glaucoma (increased intraocular pressure)* - **Glaucoma** can occur in pars planitis, often secondary to chronic inflammation affecting the **trabecular meshwork** or prolonged steroid use. - However, it is less common than cataracts and CME as a primary complication.
Question 503: Which of the following statements about corneal dystrophy is true?
- A. It involves neovascularization.
- B. It is caused by inflammation.
- C. It is usually unilateral.
- D. It is typically bilateral. (Correct Answer)
Explanation: ***It is typically bilateral.*** - **Corneal dystrophies** are inherited genetic disorders that usually affect both eyes symmetrically. - This bilateral presentation is a key characteristic distinguishing them from other corneal conditions. *It is caused by inflammation.* - **Corneal dystrophies** are primarily genetic and degenerative, not inflammatory. - While inflammation can cause corneal damage (e.g., keratitis), it is not the underlying cause of dystrophy. *It involves neovascularization.* - **Neovascularization** (growth of new blood vessels) is typically a response to chronic inflammation, hypoxia, or infection in the cornea. - It is generally not a feature of primary corneal dystrophies, which are characterized by abnormal deposits or structural changes within the corneal layers. *It is usually unilateral.* - As inherited genetic conditions, **corneal dystrophies** almost always affect both eyes. - Unilateral involvement would suggest a different etiology, such as trauma, infection, or a localized acquired condition.