Forensic Medicine
3 questionsIPC 201 deals with which of the following?
What does Section 191 of the Indian Penal Code (IPC) pertain to?
What type of evidence is a dying declaration?
NEET-PG 2015 - Forensic Medicine NEET-PG Practice Questions and MCQs
Question 551: IPC 201 deals with which of the following?
- A. Providing false information to the police
- B. Causing grievous hurt to another person
- C. Kidnapping a person
- D. Embalming a body before an autopsy (Correct Answer)
Explanation: ***Embalming a body before an autopsy*** - **IPC (Indian Penal Code) 201** addresses the destruction of evidence or giving false information to screen an offender, specifically focusing on actions that impede justice in criminal investigations. - While not explicitly listing "embalming a body," judicial interpretations and legal precedents recognize that **embalming a body before an autopsy**, when an autopsy is required, would fall under **destruction of evidence** by significantly altering or obliterating crucial forensic clues. *Providing false information to the police* - This act is covered under different sections of the IPC, such as **IPC 182 (False information with intent to cause public servant to use his lawful power to the injury of another person)**, not solely IPC 201. - IPC 201 specifically pertains to actions taken to **screen an offender from legal punishment** by destroying evidence or giving false information, implying a more direct link to a committed offense. *Causing grievous hurt to another person* - This is addressed by **IPC 320 to 326 (Of Hurt)**, which deals with various types of grievous hurt and their punishments. - IPC 201 is related to acts that obstruct justice after a crime, rather than the commission of the crime itself. *Kidnapping a person* - This offense is covered under **IPC 359 to 369 (Of Kidnapping and Abduction)**, detailing different forms of kidnapping and their respective punishments. - Similar to grievous hurt, kidnapping is an original offense, whereas IPC 201 deals with actions taken post-offense to cover up criminal activity.
Question 552: What does Section 191 of the Indian Penal Code (IPC) pertain to?
- A. Medical negligence
- B. Assault punishment
- C. Giving false evidence (Correct Answer)
- D. Hostile witness
Explanation: ***Giving false evidence*** - Section 191 of the Indian Penal Code **specifically defines the offence of giving false evidence** - It addresses situations where a person, under oath or express provision of law to state the truth, makes a statement that is false and which he/she either **knows or believes to be false**, or does not believe to be true - This section is fundamental to **maintaining the integrity of legal proceedings** and protecting against perjury *Medical negligence* - Medical negligence is typically covered under **other sections of the IPC**, such as Section 304A (causing death by negligence) or Section 338 (causing grievous hurt by act endangering life or personal safety of others) - It may also be addressed under **civil law provisions** or the Consumer Protection Act - It involves a breach of duty by a medical professional that causes harm to a patient *Hostile witness* - The concept of a hostile witness is related to **evidentiary rules in criminal procedure**, particularly under the Indian Evidence Act, 1872 - **Not defined or addressed by any specific section in the IPC** - A hostile witness is one who does not support the party that called them to testify, often contradicting their own prior statements *Assault punishment* - The punishment for assault is covered under **Sections 351 to 358 of the IPC** - These sections define what constitutes assault and criminal force, along with penalties for different degrees of such offenses - Section 191 has no connection to assault-related provisions
Question 553: What type of evidence is a dying declaration?
- A. Documentary evidence
- B. Oral evidence (Correct Answer)
- C. Hearsay evidence
- D. Circumstantial evidence
Explanation: ***Oral evidence*** - A **dying declaration** is classified as **oral evidence** in Indian law and forensic medicine practice. - It is a **verbal statement** made by a person who is dying, concerning the cause or circumstances of their death, which is later testified to in court by the person who heard it. - Under **Section 32 of the Indian Evidence Act, 1872**, dying declarations are admissible and form substantive evidence. - Though oral in nature, they carry significant evidentiary value and can be the sole basis for conviction if found reliable. *Hearsay evidence* - While technically a dying declaration originates as an **out-of-court statement**, in Indian legal practice it is treated as an **exception to the hearsay rule** and elevated to substantive evidence. - In forensic medicine classification for Indian exams, it is primarily categorized as **oral evidence** rather than hearsay. *Circumstantial evidence* - **Circumstantial evidence** relies on inference to establish a fact (e.g., fingerprints at crime scene suggesting presence). - A dying declaration is a **direct statement** about the circumstances of death, not requiring inference to establish the fact stated. *Documentary evidence* - **Documentary evidence** consists of written documents, records, or inscriptions presented in court. - A dying declaration is primarily a **verbal statement**, even though it may later be recorded or transcribed in written form.
Pharmacology
5 questionsFlu-like symptoms are a side effect of which anti-TB drug?
Where does the oxidation of drugs mainly take place?
What is the mechanism of action of ticagrelor?
Which of the following statements best describes the underlying mechanism of heparin-induced thrombocytopenia?
Which of the following statements about oral iron preparations is correct?
NEET-PG 2015 - Pharmacology NEET-PG Practice Questions and MCQs
Question 551: Flu-like symptoms are a side effect of which anti-TB drug?
- A. Rifampicin (Correct Answer)
- B. Isoniazid
- C. Pyrazinamide
- D. Ethambutol
Explanation: ***Rifampicin*** - **Flu-like syndrome** (fever, chills, myalgia, and headache) is a dose-dependent side effect of **rifampicin**, particularly with intermittent dosing. - This reaction is due to **immunological mechanisms**, involving antibodies against rifampicin. *Isoniazid* - The most significant side effect of isoniazid is **hepatotoxicity**, which can range from mild elevated liver enzymes to severe hepatitis. - It can also cause **peripheral neuropathy**, particularly in malnourished patients or those with risk factors, preventable with pyridoxine (vitamin B6) supplementation. *Pyrazinamide* - **Hepatotoxicity** is a major concern with pyrazinamide, often leading to elevated liver enzymes and, in some cases, severe liver damage. - It frequently causes **hyperuricemia**, which can precipitate acute gouty arthritis due to decreased excretion of uric acid. *Ethambutol* - The most characteristic adverse effect of ethambutol is **optic neuritis**, causing decreased visual acuity, red-green color blindness, and visual field defects. - Regular **ophthalmological monitoring** is crucial during treatment to detect this reversible side effect early.
Question 552: Where does the oxidation of drugs mainly take place?
- A. Smooth ER (Correct Answer)
- B. Rough ER
- C. Cytoplasm
- D. Nucleus
Explanation: **Smooth ER** - The **smooth endoplasmic reticulum (SER)** is rich in enzymes, particularly the **cytochrome P450 system**, which is primarily responsible for phase I **oxidation reactions** of many drugs and xenobiotics [1]. - These oxidative reactions typically **increase the polarity** of drugs, making them easier to excrete [1]. *Nucleus* - The nucleus primarily contains the cell's **genetic material** (DNA) and is involved in **gene expression** and replication. - It does not contain the necessary enzymatic machinery for the major oxidative metabolism of drugs. *Rough ER* - The **rough endoplasmic reticulum (RER)** is characterized by the presence of **ribosomes** and is mainly involved in the **synthesis, folding, modification, and transport of proteins** destined for secretion or insertion into membranes [2]. - While it plays a role in protein synthesis, it is not the primary site for drug oxidation. *Cytoplasm* - The cytoplasm contains various organelles and is the site of many metabolic pathways, including **glycolysis** and some **phase II drug metabolism** (e.g., glucuronidation, sulfation) [1]. - However, the bulk of phase I **oxidative drug metabolism** does not occur in the general cytoplasm but rather within the smooth ER due to the concentration of relevant enzymes there [1].
Question 553: What is the mechanism of action of ticagrelor?
- A. Reversible inhibition of ADP action (Correct Answer)
- B. Irreversible inhibition of ADP action
- C. Reversible inhibition of GPIIb/IIIa
- D. Irreversible inhibition of GPIIb/IIIa
Explanation: ***Reversible inhibition of ADP action*** - **Ticagrelor** is a **P2Y12 receptor antagonist** that works by preventing ADP from binding to its receptor on platelets [2]. - This binding is **reversible**, meaning ticagrelor can dissociate from the receptor, allowing for some recovery of platelet function over time [2]. *Irreversible inhibition of ADP action* - **Clopidogrel** and **prasugrel** are examples of **irreversible P2Y12 inhibitors**, forming a permanent bond with the receptor [2]. - Irreversible inhibition leads to a longer duration of platelet inhibition, as new platelets must be generated for function to return [2]. *Reversible inhibition of GPIIb/IIIa* - **GPIIb/IIIa inhibitors** like **eptifibatide** and **tirofiban** block the final common pathway of platelet aggregation by preventing fibrinogen binding [1]. - While their action is reversible, they target a *different* mechanism than ticagrelor. *Irreversible inhibition of GPIIb/IIIa* - **Abciximab** is a GPIIb/IIIa inhibitor that binds **irreversibly** (or with very slow dissociation) to the receptor [1]. - Unlike reversible GPIIb/IIIa inhibitors, abciximab is a monoclonal antibody with a prolonged antiplatelet effect [1]. - This is still an incorrect answer as ticagrelor targets the P2Y12 receptor, not GPIIb/IIIa.
Question 554: Which of the following statements best describes the underlying mechanism of heparin-induced thrombocytopenia?
- A. Low molecular weight heparin can also cause heparin-induced thrombocytopenia.
- B. Vitamin K is not an antidote for heparin-induced thrombocytopenia.
- C. Heparin-induced thrombocytopenia can occur after several days of heparin therapy.
- D. Antibodies are formed against heparin-platelet factor 4 complexes. (Correct Answer)
Explanation: **_Antibodies are formed against platelet factor 4._** - The underlying mechanism of **heparin-induced thrombocytopenia (HIT)** involves the formation of antibodies against complexes of **heparin and platelet factor 4 (PF4)** [2]. - These antibodies bind to the **heparin-PF4 complexes** on the surface of platelets, leading to platelet activation, aggregation, and consumption, which results in thrombocytopenia and a prothrombotic state [2]. *Low molecular weight heparin can also cause heparin-induced thrombocytopenia.* - While **low molecular weight heparin (LMWH)** has a lower incidence of causing HIT compared to unfractionated heparin, it can still trigger the condition [1], [2]. - This is because LMWH, like unfractionated heparin, can form complexes with PF4, leading to the same immune response in susceptible individuals [2]. *Vitamin K is not an antidote for heparin-induced thrombocytopenia.* - **Vitamin K** is the antidote for warfarin overdose, which works by reversing its anticoagulant effects [3]. - It has no role as an antidote for HIT because HIT is an **immune-mediated reaction** involving platelet activation, not a direct anticoagulant effect that can be reversed by Vitamin K [2]. *Heparin-induced thrombocytopenia can occur after several days of heparin therapy.* - HIT typically manifests after **5 to 10 days of heparin exposure**, as it takes time for the immune system to produce antibodies against the heparin-PF4 complexes [2]. - However, in patients with prior exposure to heparin, HIT can occur much sooner, even within **24 hours**, due to pre-existing antibodies.
Question 555: Which of the following statements about oral iron preparations is correct?
- A. Most commonly used preparation is ferrous gluconate
- B. Ferrous fumarate is most efficient
- C. Ferric preparations are more effective
- D. Different preparations have different bioavailability (Correct Answer)
Explanation: ***Different preparations have different bioavailability*** - The **bioavailability** of oral iron preparations varies depending on the specific salt used, its formulation, and the presence of absorption enhancers or inhibitors. - This difference in absorption impacts the required dose and efficacy in treating **iron deficiency anemia**. *Most commonly used preparation is ferrous gluconate* - **Ferrous sulfate** is the most commonly prescribed and cost-effective oral iron preparation due to its high iron content and good bioavailability. - While ferrous gluconate is used, its iron content is lower than ferrous sulfate, making it less frequently the primary choice. *Ferrous fumarate is most efficient* - While **ferrous fumarate** has a high elemental iron content, its efficiency doesn't necessarily surpass that of ferrous sulfate or other preparations when considering factors like bioavailability and side effect profile. - **Ferrous sulfate** is often considered efficient due to its balance of elemental iron content, bioavailability, and cost-effectiveness. *Ferric preparations are more effective* - **Ferrous (Fe2+)** iron is generally better absorbed than **ferric (Fe3+)** iron, as ferric iron needs to be reduced to its ferrous form before absorption. - Unless specifically formulated for enhanced absorption (e.g., ferric maltol), ferric preparations are typically *less* effective for initial iron repletion.
Physiology
2 questionsRebound increase in gastric acid secretion after stopping proton pump inhibitor therapy is due to?
Regarding Caisson's disease which statement among the following is CORRECT?
NEET-PG 2015 - Physiology NEET-PG Practice Questions and MCQs
Question 551: Rebound increase in gastric acid secretion after stopping proton pump inhibitor therapy is due to?
- A. Parietal cell hyperplasia
- B. Increased histamine release
- C. Hypergastrinemia (Correct Answer)
- D. Hypersensitivity of Ach receptors
Explanation: ***Hypergastrinemia*** - Proton pump inhibitors (PPIs) create a state of **hypochlorhydria** (reduced stomach acid), which in turn stimulates the **G cells** in the stomach to produce more **gastrin**. - This elevated gastrin level leads to a compensatory increase in the number and activity of **parietal cells**, causing a rebound hypersecretion of acid when PPI therapy is discontinued. *Parietal cell hyperplasia* - While parietal cell hyperplasia can occur, it is a consequence of chronic **hypergastrinemia**, not the primary driver of rebound acid secretion. - The direct effect of increased gastrin stimulating existing parietal cells is more immediate and significant for the rebound phenomenon. *Increased histamine release* - Elevated histamine release from **enterochromaffin-like (ECL) cells** is a downstream effect of hypergastrinemia, as gastrin stimulates ECL cells. - While increased histamine contributes to acid secretion, the root cause for its increase in this context is the **hypergastrinemia** induced by PPIs. *Hypersensitivity of Ach receptors* - **Acetylcholine (Ach) receptors** on parietal cells are involved in direct neural stimulation of acid secretion. - There is no evidence that stopping PPIs causes an increased sensitivity of these receptors, or that this is the primary mechanism of rebound acid secretion.
Question 552: Regarding Caisson's disease which statement among the following is CORRECT?
- A. Lung damage is caused by air embolism
- B. Pain in the joints is due to nitrogen bubbles (Correct Answer)
- C. Tremors are seen due to nitrogen narcosis
- D. High pressure Nervous syndrome can be prevented by using mixtures of Oxygen & Helium
Explanation: ***Pain in the joints is due to nitrogen bubbles*** - Caisson's disease, or **decompression sickness**, is characterized by the formation of nitrogen gas bubbles in tissues and blood due to rapid depressurization. - These gas bubbles can accumulate in joints, causing **severe pain** often referred to as "the bends." *Lung damage is caused by air embolism* - While air embolism can occur due to **pulmonary barotrauma** during ascent (rapid depressurization), the primary lung damage associated with decompression sickness is not typically directly caused by an air embolism reaching the lungs from within the body. - Air embolism from pulmonary barotrauma is a distinct complication, where air from ruptured alveoli enters the arterial circulation, potentially leading to cerebral or cardiac ischemia. *Tremors are seen due to nitrogen narcosis* - **Nitrogen narcosis** is a condition that occurs at high ambient pressures when breathing compressed air, causing a reversible alteration in consciousness similar to alcohol intoxication, but it does not primarily cause tremors. - Tremors are more characteristic of other neurological conditions or high-pressure nervous syndrome, not nitrogen narcosis itself. *High pressure Nervous syndrome can be prevented by using mixtures of Oxygen & Helium* - **High-pressure nervous syndrome (HPNS)** is indeed associated with deep dives using helium-oxygen mixtures. Its symptoms include tremors. - HPNS is actually **prevented or mitigated** by adding small amounts of narcotic gases like nitrogen to the helium-oxygen mixture (e.g., trimix) to counteract the excitatory effects of helium, rather than solely using oxygen and helium.