Community Medicine
1 questionsAccording to NPCBVI, blindness is defined as:
INI-CET 2025 - Community Medicine INI-CET Practice Questions and MCQs
Question 101: According to NPCBVI, blindness is defined as:
- A. Corrected visual acuity 6/60 in better eye
- B. Corrected visual acuity 3/60 in better eye
- C. Presenting visual acuity < 3/60 in better eye (Correct Answer)
- D. Presenting visual acuity 6/60 in better eye
Explanation: ***Presenting visual acuity < 3/60 in better eye*** - According to the **NPCBVI (National Programme for Control of Blindness and Visual Impairment)**, blindness is defined as **presenting visual acuity of less than 3/60** or visual field loss less than 10 degrees in the better eye. - **Presenting visual acuity** is defined as the visual acuity measured with the person's current spectacle correction (if any) or without correction. - This definition helps capture the true burden of vision loss in the community, including those who lack access to or compliance with corrective measures. *Corrected visual acuity 3/60 in better eye* - Using **"corrected visual acuity"** implies measurement taken with the best possible spectacle or contact lens correction, which is used for defining vision impairment according to **WHO standards**, but not the specific NPCBVI definition for blindness status in India. - The current NPCBVI definition uses **presenting acuity** to better reflect the functional vision status in real-world conditions. *Presenting visual acuity 6/60 in better eye* - A visual acuity of 6/60 (or less than 6/18 down to 6/60) in the better eye falls under the category of **Severe Visual Impairment** or low vision, but not clinical blindness, according to NPCBVI and WHO definitions. - The cut-off for clinical blindness is significantly lower, which is **less than 3/60**. *Corrected visual acuity 6/60 in better eye* - This measurement, regardless of whether it is presenting or corrected, falls into the category of **Visual Impairment** (low vision), specifically severe visual impairment (WHO Category 2). - The defining threshold for clinical blindness is acuity worse than 3/60, not 6/60.
Internal Medicine
4 questionsA 62-year-old male presents with sudden onset of shortness of breath and bilateral pedal edema. He is compliant with antihypertensive medications. Echocardiography reveals ejection fraction of 60 %, concentric left ventricular hypertrophy, left atrial enlargement, and grade 2 diastolic dysfunction. What is the most appropriate next step to improve his condition?
A 58-year-old male presents with burning micturition. Prostatic examination is normal. Urinalysis shows >50 pus cells per high power field, but urine culture shows no growth. What is the most likely diagnosis?
A 20-year-old male presents with fever, severe headache, vomiting, and photophobia. On examination, neck rigidity and Brudzinskis sign are positive. CT scan of the brain shows hydrocephalus. What is the most likely diagnosis?
Which of the following is not a cause of high anion gap metabolic acidosis?
INI-CET 2025 - Internal Medicine INI-CET Practice Questions and MCQs
Question 101: A 62-year-old male presents with sudden onset of shortness of breath and bilateral pedal edema. He is compliant with antihypertensive medications. Echocardiography reveals ejection fraction of 60 %, concentric left ventricular hypertrophy, left atrial enlargement, and grade 2 diastolic dysfunction. What is the most appropriate next step to improve his condition?
- A. Start digoxin to enhance myocardial contractility
- B. Perform coronary angiography to rule out ischemic cardiomyopathy
- C. Initiate loop diuretics and SGLT2 inhibitors for management of HFpEF (Correct Answer)
- D. Initiate ivabradine to reduce heart rate and improve diastolic filling
Explanation: ***Initiate loop diuretics and SGLT2 inhibitors for management of HFpEF*** - The clinical picture (sudden onset dyspnea, bilateral **pedal edema**) and echocardiography findings (EF $\ge$ 50%, **concentric LVH**, LA enlargement, **diastolic dysfunction**) define **Heart Failure with Preserved Ejection Fraction (HFpEF)** [3]. Echocardiography is essential to determine the aetiology and identify patients who will benefit from targeted therapy [1]. - **Loop diuretics** are essential for symptom relief (edema, congestion) [2], and **SGLT2 inhibitors** (e.g., empagliflozin, dapagliflozin) are recommended as foundational therapy for HFpEF, improving outcomes regardless of diabetes status. ***Perform coronary angiography to rule out ischemic cardiomyopathy*** - While coronary artery disease is a common cause of heart failure [3], the patient's EF is preserved (60%), making **ischemic cardiomyopathy** less likely as the primary cause of his acute presentation. - Coronary angiography is an invasive procedure and is not the immediate, most appropriate step for managing acute HF symptoms related to **volume overload** and diastolic dysfunction [4]. ***Start digoxin to enhance myocardial contractility*** - **Digoxin** is primarily used in **Heart Failure with Reduced Ejection Fraction (HFrEF)** (EF < 40%) to improve contractility and for rate control in atrial fibrillation. - Since the patient has preserved EF (60%), digoxin would offer little benefit and may increase the risk of toxicity without addressing the underlying **diastolic impairment**. ***Initiate ivabradine to reduce heart rate and improve diastolic filling*** - **Ivabradine** is indicated primarily in **HFrEF** (EF $\le$ 35%) for patients who are in sinus rhythm with a resting heart rate $\ge$ 70 bpm and are unable to tolerate or are maximized on beta-blockers. - It is not a standard or appropriate treatment for acutely decompensated HFpEF, where volume management and **SGLT2 inhibition** are key priorities.
Question 102: A 58-year-old male presents with burning micturition. Prostatic examination is normal. Urinalysis shows >50 pus cells per high power field, but urine culture shows no growth. What is the most likely diagnosis?
- A. Granulomatous prostatitis
- B. Chronic bacterial prostatitis
- C. Acute bacterial prostatitis
- D. Sterile pyuria (Correct Answer)
Explanation: ***Sterile pyuria*** - The combination of **pyuria** (>50 pus cells/HPF) and a **negative urine culture (no growth)** is known as sterile pyuria. This can be idiopathic or indicate conditions like **urethritis**, **tuberculosis**, or non-bacterial infections [1]. - The presence of symptoms (burning micturition) combined with pyuria and a normal prostate examination rules out typical bacterial prostatitis scenarios [1]. ***Chronic bacterial prostatitis*** - While chronic bacterial prostatitis involves recurrent symptomatic episodes and may sometimes show pyuria, it is characterized by **recurrent positive urine cultures** (often *E. coli*) and localization of bacteria to prostatic fluid. - The prostatic examination is often normal, but the hallmark is the presence of bacteria in the urine/prostatic fluid, which is absent here. ***Acute bacterial prostatitis*** - This presents with signs of systemic infection (fever, chills) and a very tender, boggy prostate, which is not mentioned, and the exam here is noted as **normal** [1]. - It always involves a **positive urine culture** due to the high bacterial load in the urine. ***Granulomatous prostatitis*** - This is a rare inflammatory condition, often related to fungal infections or **BCG therapy**, and typically manifests as a firm, nodular prostate that mimics prostate cancer. - While it can cause sterile pyuria, the presentation is usually dominated by prostatic enlargement or hardness, which is contradicted by the **normal prostatic examination** given in the prompt.
Question 103: A 20-year-old male presents with fever, severe headache, vomiting, and photophobia. On examination, neck rigidity and Brudzinskis sign are positive. CT scan of the brain shows hydrocephalus. What is the most likely diagnosis?
- A. Viral Encephalitis
- B. Bacterial Meningitis (Correct Answer)
- C. Subarachnoid Hemorrhage
- D. Normal Pressure Hydrocephalus
Explanation: ***Bacterial Meningitis*** - The clinical triad of **fever**, **headache**, and **neck rigidity** (nuchal rigidity) is classic for acute meningitis [1]. - Positive meningeal signs like **Brudzinski's sign** confirm meningeal irritation, and hydrocephalus may occur due to impaired CSF flow or absorption (communicating or non-communicating) [1]. ***Normal Pressure Hydrocephalus*** - Characterized by the triad of gait disturbance, urinary incontinence, and **dementia** (Wacky, Wobbly, Wet). - Does not typically present with acute systemic symptoms like **fever** or acute signs of meningeal irritation (neck rigidity/Brudzinski's). ***Viral Encephalitis*** - While it presents with fever and headache, the hallmark is altered mental status (confusion, seizures) and focal neurological deficits, indicating **parenchymal involvement**. - Severe, rigid **neck stiffness** (a major sign of meningeal irritation) is usually less prominent compared to bacterial meningitis [1]. ***Subarachnoid Hemorrhage*** - Presents with a sudden worst headache of life (**thunderclap headache**) and meningeal signs (neck rigidity, photophobia) [1]. - **Fever** is usually low-grade (if present) and develops later, unlike the often high fever seen in bacterial meningitis.
Question 104: Which of the following is not a cause of high anion gap metabolic acidosis?
- A. Ketoacidosis
- B. Acute kidney injury
- C. Toxins
- D. Diarrhea (Correct Answer)
Explanation: Diarrhea causes non-anion gap metabolic acidosis (NAGMA) because the excessive loss of bicarbonate-rich fluid (HCO3-) from the lower GI tract requires the retention of chloride (Cl-) to maintain electrical neutrality, leading to hyperchloremia (HCO3- loss replaced by Cl-) [2]. The resulting acidosis has a normal anion gap because the lost bicarbonate is effectively replaced by another unmeasured ion (chloride), keeping the calculated gap ([Na+] - ([Cl-] + [HCO3-])) within the normal range [1]. Severe acute kidney injury (AKI) causes high anion gap metabolic acidosis (HAGMA) due to the retention of unmeasured organic acids resulting from decreased glomerular filtration rate (GFR) [2]. Ketoacidosis (Diabetic, Alcoholic, Starvation) is a classic cause of high anion gap metabolic acidosis (HAGMA) [3]. The metabolic acidosis results from the overproduction and accumulation of ketone bodies (beta-hydroxybutyrate and acetoacetate), which are unmeasured organic acids [3]. Many toxins, such as Methanol, Ethylene glycol, and high doses of Salicylates, cause high anion gap metabolic acidosis (HAGMA) [1].
Ophthalmology
5 questionsA patient presented 2 weeks after cataract surgery with decreased vision. On examination, there were anterior chamber cells and flare with hazy vitreous. What is the most likely cause and organism?
Which of the following lasers is used in refractive surgery?
In optic neuritis, which is true?
Which of the following investigations allows examination of all layers of the retina?
All of the following are done in the treatment of amblyopia, except:
INI-CET 2025 - Ophthalmology INI-CET Practice Questions and MCQs
Question 101: A patient presented 2 weeks after cataract surgery with decreased vision. On examination, there were anterior chamber cells and flare with hazy vitreous. What is the most likely cause and organism?
- A. Endophthalmitis with Staphylococcus
- B. Endophthalmitis with Propionibacterium (Correct Answer)
- C. Sympathetic ophthalmia
- D. Toxic anterior segment syndrome
Explanation: ### **Explanation** The clinical presentation of decreased vision, anterior chamber cells/flare, and vitreous haze following cataract surgery is diagnostic of **Postoperative Endophthalmitis**. **1. Why Option B is Correct:** * **Timing:** The patient presents **2 weeks** post-surgery. While acute endophthalmitis typically occurs within 1–7 days, **delayed-onset (chronic/subacute)** endophthalmitis occurs weeks to months later. * **Organism:** ***Propionibacterium acnes*** is the most common cause of delayed-onset endophthalmitis. It is a slow-growing, Gram-positive anaerobic rod often sequestered within the capsular bag. A classic sign (though not mentioned here) is a **white plaque** on the posterior capsule. **2. Why Other Options are Incorrect:** * **Option A (Staphylococcus):** *Staphylococcus epidermidis* is the most common cause of **acute** postoperative endophthalmitis (typically presenting within the first week). *Staphylococcus aureus* causes a more virulent, rapid-onset infection. * **Option C (Sympathetic Ophthalmia):** This is a bilateral granulomatous panuveitis following penetrating trauma or surgery to one eye (the "exciting eye"). It usually presents with bilateral symptoms and specific features like Dalen-Fuchs nodules, which are absent here. * **Option D (Toxic Anterior Segment Syndrome - TASS):** TASS is a sterile inflammatory reaction caused by non-infectious substances (e.g., contaminants on instruments). Crucially, TASS presents **within 12–24 hours** and **does not involve the vitreous** (no vitreous haze). --- ### **High-Yield Clinical Pearls for INI-CET** * **Most common source of infection:** Patient’s own **conjunctival/eyelid flora**. * **Prophylaxis:** **Povidone-iodine (5%)** in the conjunctival sac is the most effective proven method to reduce endophthalmitis risk. * **Management (EVS Study):** * Vision **Hand Movements or better**: Intravitreal antibiotics (Vancomycin + Ceftazidime). * Vision **Light Perception only**: Immediate **Pars Plana Vitrectomy (PPV)**. * **TASS vs. Endophthalmitis:** TASS is early (hours) and involves only the anterior segment; Endophthalmitis is later (days/weeks) and involves the vitreous.
Question 102: Which of the following lasers is used in refractive surgery?
- A. Argon
- B. Diode
- C. Nd:YAG
- D. Excimer laser (Correct Answer)
Explanation: ### **Explanation: Lasers in Ophthalmology** The correct answer is **D. Excimer laser**. #### **1. Why Excimer Laser is Correct** The **Excimer laser** (Excited Dimer) uses a combination of a noble gas and a reactive gas (typically **Argon-Fluoride**) to produce a far-ultraviolet beam at a wavelength of **193 nm**. * **Mechanism:** It works via **photoablation**, where high-energy photons break intermolecular bonds in the corneal stroma without generating heat (cold ablation). * **Clinical Use:** This precise tissue removal allows for reshaping of the cornea to correct refractive errors in procedures like **LASIK** (Laser-Assisted In Situ Keratomileusis), **PRK** (Photorefractive Keratectomy), and **LASEK**. #### **2. Analysis of Incorrect Options** * **A. Argon Laser (514 nm):** Primarily used for **photocoagulation**. It is absorbed by melanin and hemoglobin, making it ideal for treating retinal tears, diabetic retinopathy (PRP), and performing trabeculoplasty in glaucoma. * **B. Diode Laser (810 nm):** Used for **photothermal** effects. Common applications include cyclophotocoagulation (for refractory glaucoma) and treatment of Retinopathy of Prematurity (ROP). * **C. Nd:YAG Laser (1064 nm):** A "solid-state" laser used for **photodisruption**. It creates a plasma shield to "cut" tissues. Key uses include **Posterior Capsulotomy** (for PCO) and **Peripheral Iridotomy** (for Angle-Closure Glaucoma). #### **3. High-Yield Clinical Pearls for INI-CET** * **Femtosecond Laser (1053 nm):** An infrared laser used in "Bladeless LASIK" to create the corneal flap and in **SMILE** (Small Incision Lenticule Extraction). * **Holmium Laser:** Used for **Laser Thermokeratoplasty (LTK)** to treat hyperopia. * **Double-frequency Nd:YAG (532 nm):** Also known as the **Green Laser**, commonly used for retinal photocoagulation (similar to Argon). * **Photoablation vs. Photodisruption:** Remember that Excimer = Ablation (surface reshaping), while Nd:YAG = Disruption (tissue cutting).
Question 103: In optic neuritis, which is true?
- A. Unilateral vision loss with decreased color vision
- B. Pain on eye movement only
- C. Bilateral vision loss is common
- D. Unilateral vision loss, pain on eye movement, and decreased color vision (Correct Answer)
Explanation: ### **Explanation: Optic Neuritis** **Optic Neuritis (ON)** is an inflammatory, demyelinating condition of the optic nerve, most commonly associated with **Multiple Sclerosis (MS)**. The correct answer (D) encompasses the classic clinical triad seen in acute presentations. #### **Why Option D is Correct:** The diagnosis of Optic Neuritis is primarily clinical, characterized by: * **Unilateral Vision Loss:** Usually sudden, reaching its peak within 1–2 weeks. It typically presents as a central or centrocecal scotoma. * **Pain on Eye Movement:** Present in over 90% of patients. This occurs because the origins of the superior and medial recti are closely attached to the sheath of the optic nerve at the orbital apex. * **Decreased Color Vision (Dyschromatopsia):** Often more severe than the degree of visual acuity loss. Patients frequently report that colors (especially red) appear "washed out" (**Red Desaturation**). #### **Why Other Options are Incorrect:** * **Option A:** While true, it is incomplete. Pain on eye movement is a hallmark diagnostic feature that distinguishes ON from other causes of sudden vision loss. * **Option B:** Pain is a symptom, but the primary complaint bringing the patient to the clinic is the functional deficit (vision and color loss). * **Option C:** In adults, Optic Neuritis is **characteristically unilateral**. Bilateral involvement is more common in children or specific conditions like Neuromyelitis Optica (NMO). --- ### **High-Yield Clinical Pearls for INI-CET:** * **Marcus-Gunn Pupil:** A **Relative Afferent Pupillary Defect (RAPD)** is the most important objective clinical sign. * **Pulfrich Phenomenon:** Objects moving in a straight line appear to move in a curved elliptical path. * **Uhthoff’s Phenomenon:** Temporary worsening of vision when body temperature rises (e.g., after a hot shower or exercise). * **Fundus Findings:** In **Retrobulbar Neuritis** (most common in adults), the disc looks **normal** initially ("The patient sees nothing, and the doctor sees nothing"). * **Treatment:** The **ONTT (Optic Neuritis Treatment Trial)** recommends **IV Methylprednisolone** (1g/day for 3 days) to speed up recovery. *Note: Oral steroids alone are contraindicated as they increase the rate of recurrence.*
Question 104: Which of the following investigations allows examination of all layers of the retina?
- A. OCT (Correct Answer)
- B. B-scan ultrasonography
- C. Perimetry
- D. Fundus fluorescein angiography
Explanation: ### **Explanation** **Optical Coherence Tomography (OCT)** is the correct answer because it functions as an **"optical biopsy"** of the retina. It uses low-coherence interferometry (near-infrared light) to produce high-resolution, **cross-sectional images**. This allows clinicians to visualize and measure all **ten layers of the retina** individually, from the Internal Limiting Membrane (ILM) to the Retinal Pigment Epithelium (RPE) and even the underlying choroid. #### **Why the other options are incorrect:** * **B-scan Ultrasonography:** This is a two-dimensional acoustic imaging technique. While excellent for detecting gross structural changes (like retinal detachment or intraocular tumors) when the ocular media is opaque (e.g., dense cataract or vitreous hemorrhage), it lacks the resolution to distinguish individual retinal layers. * **Perimetry:** This is a **functional** test (not structural) used to map the visual field. It identifies blind spots (scotomas) but cannot visualize the anatomical layers of the retina. * **Fundus Fluorescein Angiography (FFA):** This is a dynamic study of the **retinal vasculature**. While it is the gold standard for detecting leaks, neovascularization, and capillary non-perfusion, it provides a "top-down" view and cannot differentiate the depth or thickness of specific retinal layers. --- ### **High-Yield Clinical Pearls for INI-CET:** * **OCT Principle:** Based on **Michelson Interferometry**. * **Resolution:** OCT has a resolution of **5–10 microns**, which is significantly higher than B-scan (~150 microns). * **Key Indications:** Best for diagnosing **Macular Hole**, **Epiretinal Membrane**, and **Cystoid Macular Edema (CME)**. * **Inverted Image:** In OCT, the RPE is the most hyper-reflective (brightest) outer band. * **Swept-Source OCT (SS-OCT):** The newest generation that uses longer wavelengths to penetrate deeper into the **choroid**.
Question 105: All of the following are done in the treatment of amblyopia, except:
- A. Refractive error correction
- B. Strabismus surgery (Correct Answer)
- C. Video game therapy
- D. Patching (occlusion therapy)
Explanation: ### **Explanation: Treatment of Amblyopia** **Amblyopia** (lazy eye) is a functional reduction in visual acuity caused by abnormal visual experience early in life. The core principle of treatment is to **provide a clear retinal image** and **force the use of the amblyopic eye**. **Why Strabismus Surgery is the Correct Answer (The "Except"):** While strabismus is a major cause of amblyopia, **strabismus surgery is NOT a treatment for amblyopia itself.** Surgery corrects the ocular alignment (cosmetic or functional), but it does not improve the neural visual deficit. In fact, surgery is typically deferred until amblyopia is treated or stabilized, as a "lazy" eye has a higher risk of losing alignment post-operatively. **Analysis of Other Options:** * **Refractive error correction (A):** This is the **first step** in management. Correcting anisometropia or high refractive errors ensures a focused image reaches the retina, which can alone resolve amblyopia in some cases. * **Video game therapy (C):** This represents **Dichoptic therapy** or active vision training. It encourages binocular interaction and is an emerging, effective adjunct to traditional patching, especially in older children. * **Patching (D):** The **gold standard** of treatment. By occluding the "better" eye, the brain is forced to process signals from the amblyopic eye, strengthening the neural pathways. --- ### **High-Yield Clinical Pearls for NEET-PG/INI-CET:** * **Critical Period:** Amblyopia treatment is most effective before age **7–9 years**, though some plasticity remains until the mid-teens. * **Penalization:** If a child is non-compliant with patching, **Atropine 1% drops** are used in the "good" eye to blur near vision, forcing the use of the amblyopic eye. * **Sequence of Management:** 1. Clear the visual axis (e.g., cataract surgery). 2. Correct refractive errors (Glasses). 3. Occlusion/Penalization. 4. **Last step:** Strabismus surgery (only after maximal visual acuity is achieved).