Anatomy
1 questionsWhich of the following nerves gives sensory supply to the orbit?
INI-CET 2025 - Anatomy INI-CET Practice Questions and MCQs
Question 11: Which of the following nerves gives sensory supply to the orbit?
- A. Trigeminal nerve (Correct Answer)
- B. Hypoglossal nerve
- C. Oculomotor nerve
- D. Vagus nerve
Explanation: ***Trigeminal nerve*** - The **Ophthalmic division (V1)** of the Trigeminal nerve (CN V) is the primary source of general sensation for structures within the orbit, including the globe, conjunctiva, and lacrimal gland. - Its key branches, which include the **frontal**, **lacrimal**, and **nasociliary nerves**, are responsible for carrying these sensory fibers. *Vagus nerve* - The Vagus nerve (CN X) is primarily involved in **parasympathetic control** of the thoracic and abdominal viscera, and motor supply to the pharynx and larynx. - It does not supply the orbit with any **general sensory** fibers; its distribution is mainly to the neck, chest, and abdomen. *Hypoglossal nerve* - The Hypoglossal nerve (CN XII) is a purely **somatic motor nerve** originating from the medulla. - Its function is restricted to supplying the **intrinsic and extrinsic muscles of the tongue**, having no role in orbital innervation or sensation. *Oculomotor nerve* - The Oculomotor nerve (CN III) is predominantly a **motor nerve** that supplies four of the six extraocular muscles and the **Levator palpebrae superioris**. - While it carries **parasympathetic fibers** to the ciliary ganglion, it does not provide **general sensory** supply to the orbital structures.
Anesthesiology
1 questionsA 65-year-old patient is on mechanical ventilation for acute respiratory distress syndrome (ARDS). Suddenly, the patient becomes hypotensive, tachycardic, and shows absent breath sounds on the left side with tracheal deviation to the right. What is the most common cause of this in patients receiving mechanical ventilation?
INI-CET 2025 - Anesthesiology INI-CET Practice Questions and MCQs
Question 11: A 65-year-old patient is on mechanical ventilation for acute respiratory distress syndrome (ARDS). Suddenly, the patient becomes hypotensive, tachycardic, and shows absent breath sounds on the left side with tracheal deviation to the right. What is the most common cause of this in patients receiving mechanical ventilation?
- A. Barotrauma due to high airway pressure (Correct Answer)
- B. Endotracheal tube malposition
- C. Oxygen toxicity
- D. High tidal volume
Explanation: ### **Explanation** The clinical presentation of sudden **hypotension, tachycardia, absent breath sounds**, and **tracheal deviation** in a ventilated patient is a classic description of a **Tension Pneumothorax**. **1. Why Option A is Correct:** In patients with **ARDS**, the lungs are "stiff" (low compliance), necessitating higher airway pressures to maintain ventilation. **Barotrauma** refers to alveolar rupture caused by high **Peak Inspiratory Pressure (PIP)** or high **Plateau Pressure (>30 cm H₂O)**. This allows air to escape into the pleural space. Under positive pressure ventilation, this air accumulates rapidly, causing a "one-way valve" effect that shifts the mediastinum, compresses the great veins, and leads to obstructive shock (hypotension). **2. Analysis of Incorrect Options:** * **B. Endotracheal tube malposition:** While common (usually right mainstem intubation), it typically causes absent breath sounds on the left but **does not** cause tracheal deviation or sudden hemodynamic collapse unless associated with a secondary pneumothorax. * **C. Oxygen toxicity:** This is a chronic complication of high FiO₂ (>0.6) leading to free radical damage and absorption atelectasis; it does not present with acute surgical emphysema or tension physiology. * **D. High tidal volume:** While high tidal volumes lead to **Volutrauma**, the immediate mechanical cause of a pneumothorax is the resultant high pressure (**Barotrauma**). Barotrauma is the specific term for the complication described. --- ### **High-Yield Clinical Pearls for INI-CET** * **Management:** Tension pneumothorax is a **clinical diagnosis**. Do not wait for a X-ray. Immediate treatment is **Needle Decompression** (traditionally 2nd intercostal space, now preferred in the **5th intercostal space** anterior to the mid-axillary line) followed by an Intercostal Drainage (ICD) tube. * **ARDS Strategy:** To prevent barotrauma, use **Lung Protective Ventilation**: Low tidal volumes (6 mL/kg PBW) and keeping Plateau Pressure **<30 cm H₂O**. * **Early Sign:** A sudden increase in **Peak Airway Pressure** on the ventilator monitor is often the first sign of impending barotrauma.
Community Medicine
2 questionsIn a village of 100 children, 10 children have a past history of measles (i.e., they are not at risk now), 20 new cases of measles were reported this year. What is the incidence of measles in this population for the year?
Match the following: Vector/agent : 1. Louse - 2. Tick - 3. Mite - 4. Poxvirus Diseases caused : A. Epidemic typhus - B. Rocky Mounted Spotted Fever (RMSF) - C. Scrub typhus - D. Molluscum contagiosum
INI-CET 2025 - Community Medicine INI-CET Practice Questions and MCQs
Question 11: In a village of 100 children, 10 children have a past history of measles (i.e., they are not at risk now), 20 new cases of measles were reported this year. What is the incidence of measles in this population for the year?
- A. 22.22 % (Correct Answer)
- B. 10 %
- C. 30 %
- D. 20 %
Explanation: ***22.22 %*** - Incidence is calculated as the ratio of **new cases** (20) to the **population at risk** (susceptible population) over the specified period. - The **population at risk** is the total population (100) minus those who are already immune (10), making the denominator 90. Incidence = (20/90) × 100 = **22.22 %**. *20 %* - This result is obtained by incorrectly using the **total population** (100) as the denominator (20/100 × 100), ignoring the already immune group. - Using the total population in the denominator leads to an underestimate of the true **attack rate** or incidence among the susceptible group. *10 %* - This figure represents the proportion of children who had suffered from measles in the past (10/100), reflecting a form of **past prevalence**, not incidence. - Incidence focuses exclusively on the **new cases** that developed within the year. *30 %* - This percentage represents the **cumulative prevalence** at the end of the year, including both old (10) and new (20) cases, divided by the total population (30/100). - Incidence requires the denominator to be the **population at risk** (those who could develop the disease), not the total population.
Question 12: Match the following: Vector/agent : 1. Louse - 2. Tick - 3. Mite - 4. Poxvirus Diseases caused : A. Epidemic typhus - B. Rocky Mounted Spotted Fever (RMSF) - C. Scrub typhus - D. Molluscum contagiosum
- A. 1-B, 2-A, 3-C, 4-D
- B. 1-D, 2-B, 3-C, 4-A
- C. 1-C, 2-B, 3-A, 4-D
- D. 1-A, 2-B, 3-C, 4-D (Correct Answer)
Explanation: ***1-A, 2-B, 3-C, 4-D*** - **1-A (Louse - Epidemic typhus):** Epidemic typhus is caused by *Rickettsia prowazekii*, transmitted to humans via the bite or feces of the **human body louse** (*Pediculus humanus corporis*). This is a classic louse-borne rickettsial disease. - **2-B (Tick - Rocky Mountain Spotted Fever):** RMSF is caused by *Rickettsia rickettsii* and transmitted by **hard ticks**, primarily *Dermacentor* species. It is the most severe tick-borne rickettsial illness in the United States. - **3-C (Mite - Scrub typhus):** Scrub typhus is caused by *Orientia tsutsugamushi*, transmitted by the bite of infected **larval mites** (chiggers) of the *Leptotrombidium* genus. It is endemic in the Asia-Pacific region. - **4-D (Poxvirus - Molluscum contagiosum):** Molluscum contagiosum is a benign viral skin infection caused by the **Molluscum contagiosum virus**, a member of the Poxviridae family. It spreads through direct contact, not via arthropod vectors. *1-B, 2-A, 3-C, 4-D* - The match **1-B** is incorrect: **Louse** transmits **Epidemic typhus (A)**, not Rocky Mountain Spotted Fever (B), which is tick-borne. - The match **2-A** is incorrect: **Tick** transmits **Rocky Mountain Spotted Fever (B)**, not Epidemic typhus (A), which is louse-borne. *1-D, 2-B, 3-C, 4-A* - The match **1-D** is incorrect: **Louse** is an arthropod vector for **Epidemic typhus (A)**, while **Molluscum contagiosum (D)** is a viral disease spread by direct contact, not lice. - The match **4-A** is incorrect: **Poxvirus** causes **Molluscum contagiosum (D)**, while **Epidemic typhus (A)** is a rickettsial infection transmitted by lice, not a poxvirus disease. *1-C, 2-B, 3-A, 4-D* - The match **1-C** is incorrect: **Louse** transmits **Epidemic typhus (A)**, not **Scrub typhus (C)**, which is transmitted by larval mites. - The match **3-A** is incorrect: **Mites** transmit **Scrub typhus (C)**, not **Epidemic typhus (A)**, which is a louse-borne disease.
Internal Medicine
4 questionsWhich of the following is not a recognised cause of recurrent renal stone formation?
Which of the following is one of the earliest presenting symptoms in a patient with Multiple Sclerosis?
Which of the following is the most common clinical feature observed during the progression of systemic lupus erythematosus (SLE)?
According to WHO, which of the following is the recommended diagnostic test for spinal tuberculosis?
INI-CET 2025 - Internal Medicine INI-CET Practice Questions and MCQs
Question 11: Which of the following is not a recognised cause of recurrent renal stone formation?
- A. Hypercalciuria
- B. Hypercitraturia (Correct Answer)
- C. Hyperuricosuria
- D. Hyperoxaluria
Explanation: ***Hypercitraturia*** - It is generally **protective** against calcium stone formation because **citrate** binds to calcium in the urine, making it more soluble and inhibiting crystal nucleation. [1] - **Hypocitraturia** (low urinary citrate), not hypercitraturia, is a well-recognized metabolic risk factor for the formation of **calcium oxalate stones**. *Hyperoxaluria* - **Oxalate** readily binds with calcium to form **calcium oxalate stones**, the most common type of kidney stone. - Both primary and secondary hyperoxaluria significantly increase the degree of urinary **supersaturation**, driving stone formation. *Hypercalciuria* - High levels of urinary calcium increases urine saturation, leading to the precipitation of calcium salts, primarily forming **calcium oxalate** or **calcium phosphate** stones. [1] - It is the most frequent metabolic abnormality observed in patients with **recurrent nephrolithiasis**. *Hyperuricosuria* - Excess urinary **uric acid** directly causes **uric acid stones**, especially in acidic urine. [1] - Importantly, uric acid crystals can also serve as a **nidus** for the heterogeneous nucleation of **calcium oxalate** stones, increasing overall stone risk. [1]
Question 12: Which of the following is one of the earliest presenting symptoms in a patient with Multiple Sclerosis?
- A. Ataxia
- B. Vertigo
- C. Facial palsy
- D. Sensory disturbances (Correct Answer)
Explanation: ***Sensory disturbances*** - **Sensory symptoms**, such as numbness, tingling (paresthesias), or hypoesthesia, are among the most common **initial complaints** (up to 40% of patients) in Multiple Sclerosis, often affecting the limbs or trunk [1]. - These symptoms occur due to demyelination in the **spinal cord** or **sensory pathways** in the brainstem. *Ataxia* - While **ataxia** (coordination problems) is a characteristic symptom of MS, usually resulting from cerebellar or posterior column involvement, it is less frequently the **absolute earliest** presentation [1]. - Ataxia often signifies later-stage progression or a focus of demyelination within the cerebellum or its connections [1]. *Vertigo* - **Vertigo** can occur in MS due to demyelination of the **vestibular pathways** in the brainstem (e.g., lesions affecting the **Medial Longitudinal Fasciculus (MLF)**) [1]. - However, isolated vertigo is typically a less common initial symptom compared to **sensory changes** or optic neuritis. *Facial palsy* - **Facial palsy** (Cranial Nerve VII involvement) can result from a plaque in the pons, but it is a relatively **rare** initial manifestation of Multiple Sclerosis. - Early cranial nerve involvement is more classically presented as **Optic Neuritis** or Diplopia (e.g., Internuclear Ophthalmoplegia).
Question 13: Which of the following is the most common clinical feature observed during the progression of systemic lupus erythematosus (SLE)?
- A. Nephrotic syndrome
- B. Arthralgia & myalgia (Correct Answer)
- C. Anemia and thrombocytopenia
- D. Photosensitivity
Explanation: ### Arthralgia & myalgia - **Arthralgia (joint pain)** and **myalgia (muscle pain)** are documented as the most common initial and persistent clinical features, occurring in over 90% of SLE patients [1]. - The arthritis in SLE is typically non-erosive and symmetrical, often affecting the small joints of the hands, wrists, and knees. *Photosensitivity* - While very common and a key diagnostic criterion, it occurs in about 40-50% of patients, making it less frequent than diffuse joint and muscle pain [1]. - It is a prominent feature of cutaneous involvement, often leading to the characteristic **malar rash** or discoid lesions after sun exposure [1]. *Nephrotic syndrome* - Renal involvement (**Lupus nephritis**) is serious, but clinically overt nephrotic syndrome (heavy proteinuria, edema) is found only in a subset of patients with Type III, IV, or V nephritis. - Overall, symptomatic renal disease affects about 50-60% of patients, less frequent than musculoskeletal symptoms. *Anemia and thrombocytopenia* - **Hematologic abnormalities** (anemia, leukopenia, and thrombocytopenia) are common and considered diagnostic criteria but occur in roughly 50% or less of patients. - **Anemia of chronic disease** is the most frequent hematologic finding, while **thrombocytopenia** is less common than arthralgia.
Question 14: According to WHO, which of the following is the recommended diagnostic test for spinal tuberculosis?
- A. CT scan
- B. CB-NAAT
- C. Culture and Sensitivity (Correct Answer)
- D. X-ray
Explanation: Culture and Sensitivity - It is considered the gold standard for definitive diagnosis of tuberculosis (TB) as it allows the isolation and confirmation of viable Mycobacterium tuberculosis organisms [2]. - It is essential for performing comprehensive Drug Susceptibility Testing (DST), which is critical for guiding the management of complex cases like spinal TB and detecting any drug resistance [3]. X-ray - X-rays are primarily useful for initial screening and assessing the extent of bony destruction, such as vertebral collapse (Pott's spine), but are not confirmatory [1]. - They are limited as they cannot provide bacteriological evidence or detect the presence of the M. tuberculosis organism, which is required for definitive diagnosis. CT scan - CT scans offer detailed imaging of bony morphology, disc involvement, and soft tissue pathology (e.g., paraspinal abscesses) superior to X-rays. - It remains an imaging modality and cannot replace the necessity of histopathological or microbiological confirmation and Drug Susceptibility Testing. CB-NAAT - CB-NAAT (e.g., Xpert MTB/RIF) is highly recommended by WHO for rapid diagnosis and detection of Rifampicin resistance from samples [3]. - While highly accurate, it detects nucleic acid and does not enable full Drug Susceptibility Testing against all first and second-line drugs, which Culture and Sensitivity provides.
Ophthalmology
1 questionsWhich of the following best defines blindness?
INI-CET 2025 - Ophthalmology INI-CET Practice Questions and MCQs
Question 11: Which of the following best defines blindness?
- A. Visual acuity less than 3/60 in the better eye after best possible correction (Correct Answer)
- B. Visual field less than 10 degrees from fixation in the better eye
- C. Inability to perceive light in both eyes
- D. Visual acuity less than 6/60 in the better eye
Explanation: ### **Explanation** The definition of **blindness** has evolved to align with international standards. According to the **WHO (ICD-11)** and the **National Programme for Control of Blindness (NPCB)** in India, blindness is defined as: * **Visual acuity (VA) < 3/60** (or less than 20/400) in the **better eye** with the best possible correction. * **OR** a **visual field** of less than **10 degrees** from the point of fixation in the better eye. #### **Analysis of Options:** * **Option A (Correct):** This matches the current NPCB and WHO criteria. It represents a shift from the older Indian definition (which was < 6/60) to ensure uniform global reporting. * **Option B (Incorrect):** While a visual field < 10 degrees is a criterion for blindness, the question asks for the "best definition" among the choices. Option A is the primary quantitative threshold used for VA. * **Option C (Incorrect):** This describes **Total Blindness** (No Perception of Light). While this is a form of blindness, the legal/clinical definition includes much higher levels of vision (up to 3/60) to ensure patients qualify for rehabilitation services. * **Option D (Incorrect):** VA < 6/60 was the **old NPCB definition** of blindness. It is now classified as **Severe Visual Impairment**. --- ### **High-Yield Clinical Pearls for INI-CET:** * **Visual Impairment Categories (WHO):** * **Mild:** VA < 6/12 to 6/18 * **Moderate:** VA < 6/18 to 6/60 * **Severe:** VA < 6/60 to 3/60 * **Blindness:** VA < 3/60 to No Light Perception (NLP) * **Economic Blindness:** VA < 6/60 (The level at which an individual cannot perform their profession). * **Social Blindness:** VA < 3/60 (The level at which an individual cannot navigate social environments independently). * **Manifestation:** In India, the most common cause of blindness is **Cataract**, followed by Refractive Errors and Glaucoma.
Surgery
1 questionsA 40-year-old male presents to the emergency department with severe respiratory distress, BP: 70/59 mmHg, tracheal deviation to the right, distended neck veins, and absent breath sounds on the left side. These findings are suggestive of a tension pneumothorax. What is the most appropriate immediate next step in management?
INI-CET 2025 - Surgery INI-CET Practice Questions and MCQs
Question 11: A 40-year-old male presents to the emergency department with severe respiratory distress, BP: 70/59 mmHg, tracheal deviation to the right, distended neck veins, and absent breath sounds on the left side. These findings are suggestive of a tension pneumothorax. What is the most appropriate immediate next step in management?
- A. CT Chest
- B. Airway, breathing, and circulation (ABC) assessment
- C. Chest tube insertion
- D. Perform needle thoracostomy immediately (Correct Answer)
Explanation: ### **Explanation** The patient presents with the classic clinical triad of **Tension Pneumothorax**: respiratory distress, unilateral absent breath sounds with tracheal deviation, and hemodynamic instability (hypotension/distended neck veins). **1. Why Option D is Correct:** Tension pneumothorax is a **clinical diagnosis**. The immediate goal is to convert a life-threatening tension pneumothorax into a simple pneumothorax. **Needle thoracostomy (decompression)** must be performed immediately to relieve intrapleural pressure before obtaining imaging or waiting for a chest tube setup. Delaying decompression to confirm with a chest X-ray or CT can lead to cardiac arrest due to decreased venous return. **2. Why Other Options are Incorrect:** * **Option A (CT Chest):** This is contraindicated in an unstable patient. Diagnosis is clinical; waiting for imaging is a fatal error. * **Option B (ABC assessment):** While ABCs are the foundation of trauma care, the question asks for the "immediate next step" for a diagnosed tension pneumothorax. Decompression is the specific intervention required to address the "B" (Breathing) and "C" (Circulation) compromise. * **Option C (Chest tube insertion):** This is the **definitive** treatment, but it takes longer to set up. In an emergency with hemodynamic collapse, needle decompression is the bridge to chest tube placement. **3. Clinical Pearls for NEET-PG / INI-CET:** * **Needle Site (ATLS 10th Ed):** The preferred site is the **5th intercostal space**, just anterior to the mid-axillary line (same as chest tube). The 2nd ICS at the mid-clavicular line is an alternative but has a higher failure rate due to thick chest walls. * **Pathophysiology:** A "one-way valve" mechanism allows air into the pleural space but not out, causing **mediastinal shift**, compression of the SVC/IVC, and **obstructive shock**. * **Chest Tube Site:** 5th ICS, anterior to the mid-axillary line (within the **"Triangle of Safety"**). * **Diagnosis:** Never wait for a Chest X-ray. If an X-ray is inadvertently done, look for a "deep sulcus sign" or mediastinal shift.