Anatomy
1 questionsWhat is the correct sequence of the auditory pathway?
INI-CET 2023 - Anatomy INI-CET Practice Questions and MCQs
Question 51: What is the correct sequence of the auditory pathway?
- A. Spiral Ganglion → Cochlea → Cochlear Nerve → Superior Olivary N
- B. Spiral Ganglion → Cochlear Nerve → Cochlea → Superior Olivary N
- C. Cochlea → Spiral Ganglion → Cochlear Nerve → Superior Olivary N (Correct Answer)
- D. Cochlear Nerve → Spiral Ganglion → Cochlea → Superior Olivary N
Explanation: ***Cochlea → Spiral Ganglion → Cochlear Nerve → Superior Olivary N*** - Sound vibrations are first transduced into electrical signals by the **hair cells** in the **cochlea** [2]. These signals are then transmitted to the **spiral ganglion**. - Neurons in the **spiral ganglion** generate action potentials, which are carried by the **cochlear nerve** to the brainstem, specifically the **superior olivary nucleus**, for further processing [1]. *Spiral Ganglion → Cochlea → Cochlear Nerve → Superior Olivary N* - This sequence is incorrect because the **cochlea** is where the initial mechanical-to-electrical transduction of sound occurs, *before* the signal reaches the **spiral ganglion** neurons [2]. - The spiral ganglion consists of the cell bodies of the neurons that innervate the cochlea's hair cells, meaning the cochlea must process the sound first. *Spiral Ganglion → Cochlear Nerve → Cochlea → Superior Olivary N* - This order is incorrect as the **cochlea** is the organ that processes sound input *prior* to the involvement of the **spiral ganglion** and the **cochlear nerve** [2]. - The flow of information begins at the peripheral sensory organ (cochlea) and then moves centrally. *Cochlear Nerve → Spiral Ganglion → Cochlea → Superior Olivary N* - This sequence is incorrect because the **cochlea** is the initial site of sound detection and signal generation, *before* the **cochlear nerve** transmits the signal. - The **spiral ganglion** contains the cell bodies of the neurons whose axons form the cochlear nerve, so the signal must pass through the ganglion before going down the nerve.
Internal Medicine
2 questionsWhat is/are the characterstics of Iron defficiency Anemaia(IDA)?
Patient presented with following features: - ipsilateral loss of pain and temperature sensation in the face - Contralateral loss of pain and temperature sensation in the body - Horner's syndrome - Dysphagia and hoarseness - Ataxia and vertigo Which artery is involved in syndrome based on above clinical features?
INI-CET 2023 - Internal Medicine INI-CET Practice Questions and MCQs
Question 51: What is/are the characterstics of Iron defficiency Anemaia(IDA)?
- A. Increased TIBC
- B. Low serum ferritin
- C. All of the options (Correct Answer)
- D. Low serum iron
- E. Low transferrin saturation
Explanation: ***All of the options*** - **Iron deficiency anemia (IDA)** characteristically presents with a combination of these markers due to a true depletion of the body's iron stores [2]. - A comprehensive evaluation of iron studies, including **TIBC**, **ferritin**, **serum iron**, and **transferrin saturation**, is essential for an accurate diagnosis of IDA [3]. *Increased TIBC* - **Total iron-binding capacity (TIBC)** is typically **elevated in IDA** as the body attempts to maximize iron absorption and transport by increasing the production of transferrin [1]. - Transferrin, the primary iron-binding protein, is less saturated with iron, leading to an **increased capacity to bind more iron**. *Low serum ferritin* - **Serum ferritin** is a direct measure of **iron storage** in the body and is considered the most sensitive and specific marker for iron deficiency. - In IDA, **ferritin levels are markedly decreased**, indicating depleted iron reserves. *Low serum iron* - **Serum iron** measures the amount of iron circulating in the blood, primarily bound to transferrin [4]. - In IDA, the **absolute amount of circulating iron is reduced** due to insufficient iron supply [1]. *Low transferrin saturation* - **Transferrin saturation** represents the percentage of transferrin binding sites occupied by iron. - In IDA, due to **low serum iron** and **high transferrin (indicated by increased TIBC)**, the transferrin saturation is significantly reduced.
Question 52: Patient presented with following features: - ipsilateral loss of pain and temperature sensation in the face - Contralateral loss of pain and temperature sensation in the body - Horner's syndrome - Dysphagia and hoarseness - Ataxia and vertigo Which artery is involved in syndrome based on above clinical features?
- A. Posterior inferior cerebellar artery (Correct Answer)
- B. Basilar artery.
- C. Superior cerebellar artery
- D. Anterior inferior cerebellar artery
Explanation: ***Posterior inferior cerebellar artery*** - The constellation of **ipsilateral facial numbness**, **contralateral body numbness**, **Horner's syndrome**, **dysphagia**, **hoarseness**, **ataxia**, and **vertigo** is characteristic of Wallenberg syndrome, also known as **lateral medullary syndrome**, which results from occlusion of the **posterior inferior cerebellar artery (PICA)** [1]. - This artery supplies the **lateral medulla** and **inferior cerebellum**, affecting the **spinal trigeminal nucleus and tract**, **spinothalamic tract**, **descending sympathetic fibers**, **nucleus ambiguus**, and **inferior cerebellar peduncle** [1], [2]. *Basilar artery* - **Basilar artery occlusions** typically cause more extensive deficits, including **quadriplegia**, **locked-in syndrome**, and **cranial nerve palsies**, due to its supply to the brainstem and cerebellum. - While it can affect the PICA territory, a sole PICA occlusion does not result in the widespread deficits seen with a **main basilar artery occlusion**. *Superior cerebellar artery* - Occlusion of the **superior cerebellar artery (SCA)** typically causes **ipsilateral cerebellar ataxia**, **dysarthria**, and sometimes **contralateral spinothalamic deficits** and **Horner's syndrome**, but usually spares the dysphagia and hoarseness associated with the nucleus ambiguus. - The SCA supplies the **superior cerebellum** and parts of the **pons**, which would generally not produce the full symptom complex described. *Anterior inferior cerebellar artery* - Occlusion of the **anterior inferior cerebellar artery (AICA)** typically results in **ipsilateral hearing loss/tinnitus**, **facial paralysis**, and **cerebellar ataxia**, often with **contralateral pain and temperature loss in the body**. - While it shares some features, the prominent dysphagia and hoarseness are less common with AICA strokes than with **PICA strokes**, as the AICA primarily supplies the **lateral pontine region** and **labyrinthine artery**.
Pathology
2 questionsWhat is the correct statement about thymoma?
Which of the following conditions is associated with perineural invasion?
INI-CET 2023 - Pathology INI-CET Practice Questions and MCQs
Question 51: What is the correct statement about thymoma?
- A. Chest X-ray is the investigation of choice for the diagnosis of thymoma.
- B. Thymoma is primarily located in the posterior mediastinum.
- C. Thymoma is the most common neoplasia of the thymus. (Correct Answer)
- D. Thymoma is usually asymptomatic and only occasionally causes symptoms.
Explanation: ***Thymoma is the most common neoplasia of the thymus.*** [1] - **Thymoma** is the most common primary tumor of the thymus, accounting for approximately **40-50% of anterior mediastinal masses** in adults. - It is a slow-growing tumor originating from the **epithelial cells** of the thymus [1]. *Chest X-ray is the investigation of choice for the diagnosis of thymoma.* - While a **chest X-ray** may show a widened mediastinum or an anterior mediastinal mass, it is not the investigation of choice for definitive diagnosis or staging [2]. - **CT scan** of the chest with contrast is the preferred imaging modality for evaluating thymomas, providing better anatomical detail and assessing invasiveness [2]. *Thymoma is typically asymptomatic and rarely causes any symptoms.* - Approximately **30-50% of patients with thymoma are asymptomatic** at diagnosis, with the tumor discovered incidentally on imaging [2]. - However, the remaining **50-70% of patients present with symptoms** related to **mass effect** (e.g., chest pain, dyspnea, cough) or **paraneoplastic syndromes** like myasthenia gravis, pure red cell aplasia, or hypogammaglobulinemia [2]. - Therefore, it is incorrect to say thymoma "rarely" causes symptoms. *Thymoma is primarily located in the posterior mediastinum.* - **Thymoma** is characteristically located in the **anterior mediastinum**, which is the most common site for thymic tissue. - Tumors primarily found in the posterior mediastinum are more commonly **neurogenic tumors**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 571-574. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 572-574.
Question 52: Which of the following conditions is associated with perineural invasion?
- A. Mucoepidermoid tumor
- B. Pancreatic cancer
- C. Pleomorphic adenoma
- D. Adenoid cystic carcinoma (Correct Answer)
Explanation: ***Adenoid cystic carcinoma*** - **Adenoid cystic carcinoma** is the **most notoriously characterized** by its strong propensity for **perineural invasion**, which contributes to its high recurrence rate and poor prognosis [1]. - This invasion allows the tumor cells to spread along nerve sheaths, extending beyond the visible tumor margins, often for considerable distances. - It is the **classic example** of perineural invasion among salivary gland tumors [1]. *Mucoepidermoid tumor* - While mucoepidermoid tumors can be locally aggressive, **perineural invasion** is not a characteristic feature that defines this tumor type. - They are more commonly associated with cystic degeneration and mucin production. *Pancreatic cancer* - **Pancreatic adenocarcinoma** does show **significant perineural invasion** (present in 70-90% of cases) and is an important feature contributing to its poor prognosis and pain symptoms. - However, in the context of this question, **adenoid cystic carcinoma** is considered the **most characteristic** or **prototypical** example of perineural invasion, particularly among head and neck neoplasms. - Both are associated with perineural invasion, but adenoid cystic carcinoma is the textbook example. *Pleomorphic adenoma* - A **pleomorphic adenoma** is a benign mixed tumor of the salivary glands and usually does not exhibit **perineural invasion** [2]. - Malignant transformation into a carcinoma ex pleomorphic adenoma can occur, but the benign form primarily grows as an encapsulated mass [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 753-755. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 751-753.
Pediatrics
1 questionsWhich of the following is considered a minor clinical finding suggestive of congenital heart disease?
INI-CET 2023 - Pediatrics INI-CET Practice Questions and MCQs
Question 51: Which of the following is considered a minor clinical finding suggestive of congenital heart disease?
- A. Low BP
- B. Systolic murmur grade-3
- C. Abnormal 2nd heart sound (Correct Answer)
- D. Diastolic murmur
Explanation: ***Abnormal 2nd heart sound*** - An abnormal (loud, soft, split, or single) **second heart sound (S2)** is a minor clinical finding that can suggest congenital heart disease (CHD). - This reflects abnormalities in the **pulmonary** or **aortic valve closure**, common in various CHDs. *Low BP* - **Low blood pressure** is a general sign of circulatory compromise and is not a specific or minor clinical finding for congenital heart disease itself. - It might indicate severe heart failure or shock, which are major, late-stage complications of CHD, rather than an early suggestive sign. *Systolic murmur grade-3* - A **systolic murmur of grade 3 or higher** is generally considered a **major clinical finding** and often indicates significant structural heart disease. - Minor findings are typically less intense or specific signs that still warrant further investigation. *Diastolic murmur* - The presence of **any diastolic murmur** is considered a **major clinical finding** that is highly suggestive of significant heart disease, as it often implies structural valve abnormalities or abnormal blood flow during diastole. - This is not a "minor" finding as it virtually always indicates pathology.
Pharmacology
1 questionsA kid went to a temple with his grandmother and was constantly crying. On examination he had excruciating pain, hypertension, increased heart rate, sweating profusely, priapism and cold clammy skin. What should be the treatment given to the patient?
INI-CET 2023 - Pharmacology INI-CET Practice Questions and MCQs
Question 51: A kid went to a temple with his grandmother and was constantly crying. On examination he had excruciating pain, hypertension, increased heart rate, sweating profusely, priapism and cold clammy skin. What should be the treatment given to the patient?
- A. Atropine
- B. Phentolamine (Correct Answer)
- C. Pralidoxime
- D. Naloxone
Explanation: ***Phentolamine*** - The symptoms described (hypertension, tachycardia, sweating, priapism, cold clammy skin) are indicative of an **alpha-adrenergic crisis** or **pheochromocytoma crisis**, which results from excessive release of catecholamines (e.g., norepinephrine) [1]. - **Phentolamine** is a **non-selective alpha-adrenergic antagonist** that effectively blocks the effects of excessive catecholamines, thereby reducing blood pressure and heart rate and relieving other alpha-mediated symptoms like priapism [1]. *Atropine* - **Atropine** is an **anticholinergic drug** used to treat **bradycardia** or **organophosphate poisoning**. - It would worsen the patient's condition by potentially increasing heart rate further and would not address the underlying alpha-adrenergic overstimulation. *Pralidoxime* - **Pralidoxime** is an **acetylcholinesterase reactivator** used specifically for **organophosphate poisoning**. - It works by restoring the function of acetylcholinesterase, which is inhibited by organophosphates, and is not indicated for an adrenergic crisis. *Naloxone* - **Naloxone** is an **opioid receptor antagonist** used to reverse the effects of **opioid overdose**. - This patient's symptoms are not consistent with opioid toxicity, and naloxone would have no therapeutic benefit.
Physiology
1 questionsAbsence or mutation of SRY gene results in ?
INI-CET 2023 - Physiology INI-CET Practice Questions and MCQs
Question 51: Absence or mutation of SRY gene results in ?
- A. Hydrocele testis
- B. Undescended testis
- C. None of the options
- D. Gonadal dysgenesis (Correct Answer)
Explanation: ***Gonadal dysgenesis*** - The **SRY gene** (Sex-determining region Y gene) is critical for initiating **male sexual differentiation**; its presence leads to testicular development. - Absence or mutation of the SRY gene prevents proper testicular development, leading to **gonadal dysgenesis**, where the gonads are either absent or rudimentary, often resulting in a **female phenotype** despite a XY genotype. *Hydrocele testis* - This condition involves an accumulation of fluid around the testis, which is typically due to a **patent tunica vaginalis** or fluid imbalance. - It does not directly result from a genetic mutation in the SRY gene affecting initial **gonadal development**. *Undescended testis* - This condition (cryptorchidism) refers to the failure of one or both testes to descend into the scrotum. - While it can have genetic components, it is not a direct consequence of an SRY gene absence or mutation, which primarily affects the **formation of the gonad itself**. *None of the options* - This option is incorrect because **gonadal dysgenesis** is a direct and well-established consequence of SRY gene absence or mutation. - The SRY gene's primary role is to trigger the development of the testis, and its dysfunction leads to profound abnormalities in **gonadal formation**.
Surgery
2 questionsAfter laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?
What is the baseline platelet count required for surgery?
INI-CET 2023 - Surgery INI-CET Practice Questions and MCQs
Question 51: After laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?
- A. 0.5 ml/min
- B. 0.1 CC/hr
- C. 1 ml/kg/hr
- D. 0.5-1 ml/kg/hr (Correct Answer)
Explanation: ***0.5-1 ml/kg/hr*** - The standard acceptable urine output for a postoperative patient with normal renal function is **0.5-1 ml/kg/hr** (some sources extend this to 0.5-1.5 ml/kg/hr). - A minimum of **0.5 ml/kg/hr** is considered adequate renal perfusion and function, while outputs up to 1-1.5 ml/kg/hr indicate excellent hydration and renal function. - This weight-adjusted measure is the gold standard for assessing postoperative urine output and renal function. *0.5 ml/min* - This is an absolute rate (not weight-adjusted) and is inadequate as a general measure. - For a 70 kg patient, this would be only 0.43 ml/kg/hr, which is below the minimum acceptable threshold. *0.1 CC/hr* - This rate is **severely low** and indicates **oliguria** or **anuria**. - This suggests **acute kidney injury**, severe dehydration, or inadequate renal perfusion requiring immediate intervention. *1 ml/kg/hr* - While this value falls within the acceptable range, it represents only a single point rather than the **standard range of 0.5-1 ml/kg/hr**. - The range option is more comprehensive and represents the full spectrum of normal postoperative urine output.
Question 52: What is the baseline platelet count required for surgery?
- A. 50,000/µL (50 × 10^9/L) (Correct Answer)
- B. 40,000/µL (40 × 10^9/L)
- C. 20,000/µL (20 × 10^9/L)
- D. 30,000/µL (30 × 10^9/L)
Explanation: ***50,000/µL (50 × 10^9/L)*** - A platelet count of **50,000/µL** is considered the **minimum threshold** for safe surgical procedures. - This level is generally sufficient to achieve **adequate primary hemostasis** and minimize the risk of significant perioperative bleeding. *20,000/µL (20 × 10^9/L)* - A platelet count of **20,000/µL** is generally **too low** for most surgical interventions, as it significantly increases the risk of serious bleeding. - This level is often associated with a risk of **spontaneous bleeding**, particularly in mucous membranes. *40,000/µL (40 × 10^9/L)* - While closer to the safe threshold, a platelet count of **40,000/µL** might still be considered **suboptimal** for major surgeries, especially those with a high risk of blood loss. - Some surgeons and anesthesiologists may prefer a slightly higher count to ensure a wider **safety margin**. *30,000/µL (30 × 10^9/L)* - A platelet count of **30,000/µL** is generally **insufficient** for most surgical procedures and would likely necessitate **platelet transfusion** preoperatively. - Patients at this level are at an **increased risk of bleeding** during and after surgery.