Anatomy
2 questionsEustachian tube develops from:
CSF Otorrhea is due to trauma of:
FMGE 2018 - Anatomy FMGE Practice Questions and MCQs
Question 41: Eustachian tube develops from:
- A. 2nd and 3rd pharyngeal pouch
- B. 3rd pharyngeal pouch
- C. 2nd pharyngeal pouch
- D. 1st pharyngeal pouch (Correct Answer)
Explanation: ***1st pharyngeal pouch*** - The **Eustachian tube** (also known as the pharyngotympanic tube or auditory tube) develops from the **endoderm** of the first pharyngeal pouch. - This embryonic structure also gives rise to the **tympanic cavity** and the mastoid air cells, forming part of the middle ear. *2nd and 3rd pharyngeal pouch* - The **second pharyngeal pouch** primarily contributes to the development of the **palatine tonsils**. - The **third pharyngeal pouch** is involved in the formation of the **inferior parathyroid glands** and the **thymus**. *3rd pharyngeal pouch* - The **third pharyngeal pouch** specifically differentiates into the **inferior parathyroid glands** and the **thymus**. - It does not contribute to the formation of the Eustachian tube. *2nd pharyngeal pouch* - The **second pharyngeal pouch** is primarily associated with the development of the **palatine tonsils** and the tonsillar fossa. - It does not play a role in the embryological development of the Eustachian tube.
Question 42: CSF Otorrhea is due to trauma of:
- A. Tympanic membrane
- B. Cribriform plate
- C. Parietal bone
- D. Petrous temporal bone (Correct Answer)
Explanation: ***Petrous temporal bone*** - **CSF otorrhea** (leakage of cerebrospinal fluid from the ear) most commonly results from a fracture of the **petrous portion of the temporal bone**. - This bone forms part of the skull base and houses structures of the inner and middle ear, a fracture here can create a direct communication between the **subarachnoid space** and the external ear canal. *Tympanic membrane* - A rupture of the **tympanic membrane** alone would lead to **otorrhea** (ear discharge), but it would primarily involve blood or middle ear fluid, not CSF. - While a ruptured tympanic membrane is necessary for CSF to exit the ear canal, the source of the CSF leak itself is proximal to the middle ear. *Cribriform plate* - A fracture of the **cribriform plate** typically results in **CSF rhinorrhea** (CSF leakage from the nose), as it is located structurally above the nasal cavity. - It is not directly involved in CSF leakage from the ear. *Parietal bone* - Fractures of the **parietal bone** are typically associated with epidural or subdural hematomas or brain injury, depending on the extent of the trauma. - They are not a usual cause of CSF leakage from the ear since this bone does not contain CSF pathways that directly communicate with the ear.
Biochemistry
2 questionsWhich is branching enzyme?
Preferred biochemical marker(s) in patients presenting with myocardial infarction:
FMGE 2018 - Biochemistry FMGE Practice Questions and MCQs
Question 41: Which is branching enzyme?
- A. Glycogen synthase
- B. Amylo-1, 4-1, 6-transglycolase (Correct Answer)
- C. Glycogen Phosphorylase
- D. Glucose-6 phosphatase
Explanation: ***Amylo-1, 4-1, 6-transglycolase*** - This enzyme is also known as **glycogen branching enzyme**. - It catalyzes the formation of **α-1,6-glycosidic bonds** by transferring a segment of four to six glucosyl residues from the non-reducing end of a growing glycogen chain to another chain. *Glycogen synthase* - This enzyme is responsible for the **elongation of glycogen chains** by forming **α-1,4-glycosidic bonds**. - It adds glucose units to the non-reducing end of a pre-existing glycogen primer. *Glycogen Phosphorylase* - This enzyme is involved in **glycogen degradation**. - It catalyzes the **phosphorolytic cleavage** of α-1,4-glycosidic bonds, releasing glucose-1-phosphate. *Glucose-6 phosphatase* - This enzyme is primarily found in the **liver** and kidneys and is crucial for **gluconeogenesis** and **glycogenolysis**. - It dephosphorylates glucose-6-phosphate to **free glucose**, allowing its release into the bloodstream.
Question 42: Preferred biochemical marker(s) in patients presenting with myocardial infarction:
- A. Cardiac specific Troponins (Correct Answer)
- B. All of the options
- C. Myoglobin
- D. CK-MB
Explanation: ***Cardiac specific Troponins*** - **Cardiac troponins** (cTnI and cTnT) are the preferred and most sensitive and specific biomarkers for diagnosing **myocardial infarction (MI)**. - They are proteins released into the bloodstream when myocardial cells are damaged, and their levels rise within hours of MI onset and remain elevated for several days. *All of the options* - While other markers like **CK-MB** and **Myoglobin** were historically used, **cardiac troponins** have superior specificity and sensitivity for MI. - The latest guidelines from major cardiology societies recommend troponins as the primary diagnostic markers. *Myoglobin* - **Myoglobin** is an early marker, but it is not specific to cardiac muscle and can be elevated in various conditions involving skeletal muscle damage. - Its short half-life means it can return to normal quickly, making it less reliable for diagnosing MI, especially if there's a delay in presentation. *CK-MB* - **Creatine Kinase-MB (CK-MB)** is a more specific marker than total CK for cardiac muscle damage but is still less specific than cardiac troponins. - It can be elevated in conditions like **myocarditis** or **pericarditis**, and its levels typically peak and decline earlier than troponins, limiting its diagnostic window.
Community Medicine
2 questionsProvision of services at Suraksha Clinic includes
The recommended upper limit for free residual chlorine in drinking water according to WHO guidelines is:
FMGE 2018 - Community Medicine FMGE Practice Questions and MCQs
Question 41: Provision of services at Suraksha Clinic includes
- A. Blood transfusion safety services
- B. Immunization services
- C. STI/RTI services (Correct Answer)
- D. Diarrhea control services
Explanation: ***STI/RTI services*** - **Suraksha clinics** are specifically designed under the National AIDS Control Programme (NACP) to provide comprehensive diagnostic, treatment, and counseling services for individuals with **sexually transmitted infections (STIs) and reproductive tract infections (RTIs)** including HIV. - They focus on promoting sexual health and preventing the spread of STIs through education, awareness, and clinical management. *Blood transfusion safety services* - These services are typically handled by **blood banks** and specialized transfusion medicine departments, focusing on donor screening, blood processing, and safe transfusion practices. - They are not a primary service offered by **Suraksha clinics**, which are geared towards STI/RTI management. *Immunization services* - Immunization services are usually provided at **primary health centers**, pediatric clinics, or through public health campaigns aimed at preventing infectious diseases via vaccination. - While important for public health, they are not the core offering of **Suraksha clinics**. *Diarrhea control services* - Diarrhea control services, including oral rehydration therapy and hygiene education, are typically offered by **general practitioners**, community health workers, and maternal and child health programs. - These are distinct from the specialized focus of **Suraksha clinics** on STI/RTI services.
Question 42: The recommended upper limit for free residual chlorine in drinking water according to WHO guidelines is:
- A. 0.4 mg/L
- B. 0.2 mg/L
- C. 0.3 mg/L
- D. 0.5 mg/L (Correct Answer)
Explanation: ***0.5 mg/L*** - The World Health Organization (WHO) recommends maintaining a free residual chlorine level of **0.2-0.5 mg/L** at the point of delivery, with **0.5 mg/L representing the upper end of this recommended range**. - This level provides adequate disinfection throughout the distribution system while minimizing taste and odor complaints. - WHO states there is no health-based upper limit for chlorine, as concentrations used for disinfection are well below levels of health concern, but 0.5 mg/L is commonly cited as the practical upper target for operational purposes. *0.4 mg/L* - While this falls within the acceptable range (0.2-0.5 mg/L), it is not the upper end of the WHO recommended range. - This level provides good disinfection but is not the maximum recommended operational target. *0.2 mg/L* - A free residual chlorine level of **0.2 mg/L** represents the **minimum recommended concentration** at the point of delivery to ensure adequate disinfection. - This is the lower end of the WHO recommended range, not the upper limit. *0.3 mg/L* - This concentration falls in the middle of the WHO recommended range (0.2-0.5 mg/L). - While adequate for disinfection, it is neither the minimum nor the maximum recommended operational level.
Internal Medicine
1 questionsMost common site of intracranial metastasis is from primary carcinoma of
FMGE 2018 - Internal Medicine FMGE Practice Questions and MCQs
Question 41: Most common site of intracranial metastasis is from primary carcinoma of
- A. Testes
- B. Stomach
- C. Breast
- D. Lungs (Correct Answer)
Explanation: ***Lungs*** - **Lung cancer** is the most common primary tumor to metastasize to the brain, accounting for approximately **40-50% of all intracranial metastases**. - This high incidence is due to the advanced stage at diagnosis for many lung cancers and the rich vascular supply of the brain. [1] *Testes* - While germ cell tumors of the testes can metastasize to the brain, it is a relatively rare event compared to lung cancer. - Brain metastases from testicular cancer are more common with **choriocarcinoma** histology. *Stomach* - **Gastric cancer** can metastasize to the brain, but it is uncommon, occurring in less than 1% of cases. - When it does occur, it generally indicates widespread disease and a poor prognosis. *Breast* - **Breast cancer** is another common source of brain metastases, but it ranks **second to lung cancer** as a primary source. - The incidence of brain metastases from breast cancer is increasing, partly due to improved systemic treatments extending patient survival.
Pathology
1 questionsCrescent forming glomerulonephritis is:-
FMGE 2018 - Pathology FMGE Practice Questions and MCQs
Question 41: Crescent forming glomerulonephritis is:-
- A. RPGN (Correct Answer)
- B. MCN
- C. All of the options
- D. MPGN
Explanation: ***RPGN*** - **Rapidly progressive glomerulonephritis (RPGN)** is a clinical syndrome characterized by a rapid decline in **renal function** over weeks to months, often due to severe glomerular injury. - The hallmark **histological feature** of RPGN is the formation of **crescents** in more than 50% of the glomeruli, which are proliferations of parietal epithelial cells and infiltrating macrophages [1]. *MCN* - **Minimal change nephropathy (MCN)** is characterized by **diffuse effacement of podocyte foot processes** on electron microscopy, with normal findings on light microscopy. - It typically presents as **nephrotic syndrome** and does not involve crescent formation. *MPGN* - **Membranoproliferative glomerulonephritis (MPGN)** involves thickening of the glomerular basement membrane with a "tram-track" appearance and mesangial proliferation [2]. - While MPGN can occasionally have focal crescents in some cases, **crescent formation is not a defining or characteristic feature** of MPGN [2]. - MPGN typically presents with nephritic-nephrotic syndrome. *All of the options* - This option is incorrect because only RPGN is characterized by **crescent formation** as a defining feature. - MCN does not involve crescents, and MPGN does not characteristically present with extensive crescent formation, thus invalidating this choice. **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. 528-529. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-926.
Physiology
1 questionsWhich of the following receptors mediate stretch reflex?
FMGE 2018 - Physiology FMGE Practice Questions and MCQs
Question 41: Which of the following receptors mediate stretch reflex?
- A. Golgi tendon organ
- B. Muscle spindle (Correct Answer)
- C. Meissner's corpuscles
- D. Merkel's disc
Explanation: ***Muscle spindle*** - Muscle spindles are **stretch-sensitive receptors** located within the muscle belly that detect changes in muscle length and the rate of change in length. - When a muscle is stretched, the muscle spindles are activated, sending signals via **afferent neurons** to the spinal cord, which then initiates a reflex contraction of the same muscle to counteract the stretch—this is the basis of the stretch reflex. *Golgi tendon organ* - **Golgi tendon organs** are located in the tendons and respond to changes in **muscle tension**, not muscle length. Its primary role is to prevent excessive muscle contraction. - When activated by high tension, Golgi tendon organs inhibit the muscle, leading to relaxation (inverse stretch reflex), which is opposite to the stretch reflex. *Meissner's corpuscles* - **Meissner's corpuscles** are **mechanoreceptors** located in the superficial layers of the skin, primarily responsible for detecting **light touch** and **vibrations**. - They are not involved in the regulation of muscle length or tension and therefore do not mediate the stretch reflex. *Merkel's disc* - **Merkel's discs** are **mechanoreceptors** found in the basal layer of the epidermis, specialized for detecting **sustained pressure** and **texture**. - These receptors contribute to fine tactile discrimination but are unrelated to the proprioceptive mechanisms of the stretch reflex.
Surgery
1 questionsMost common immediate complication after splenectomy?
FMGE 2018 - Surgery FMGE Practice Questions and MCQs
Question 41: Most common immediate complication after splenectomy?
- A. Fistula
- B. Bleeding from gastric mucosa
- C. Pancreatitis
- D. Hemorrhage (Correct Answer)
Explanation: **Hemorrhage** - **Hemorrhage** is the most common immediate complication due to the spleen's rich blood supply and its close proximity to major vessels such as the **splenic artery and vein**. - Surgical trauma, inadequate ligation, or dislodgment of ligatures can lead to significant blood loss post-splenectomy. *Fistula* - Fistula formation, such as a **pancreatic fistula**, can occur but is less common immediately post-splenectomy compared to hemorrhage. - This complication typically develops due to injury to the **pancreatic tail** during splenic dissection, leading to leakage of pancreatic enzymes. *Bleeding from gastric mucosa* - Bleeding from the **gastric mucosa** (e.g., from stress ulcers or gastritis) is a potential complication after any major surgery but is not the most common immediate complication specific to splenectomy. - While the stomach is in close proximity, direct injury to the gastric mucosa causing significant bleeding is less frequent than hemorrhage from the splenic bed. *Pancreatitis* - **Pancreatitis** can be a severe complication of splenectomy, resulting from injury to the **pancreatic tail** during the procedure. - While it can manifest immediately, its incidence is generally lower than that of hemorrhage.