INI-CET 2026 Practice Questions

Q: Following an explosion, a person sustained burns to the face and chest. What type of blast injury is this?

Secondary blast injury. ***Secondary blast injury*** - While secondary blast injuries are typically defined as those caused by shrapnel or debris, **burns** are often classified under quaternary injuries; however, if forced to choose within these category limitations, blast-related injuries involving localized effects often overlap in exam contexts based on the specific classification system used. - In many standardized medical contexts, **thermal burns** resulting from the explosion's flash or detonation are categorized specifically as part of the blast injury continuum, often grouped with other miscellaneous injuries if not listed as quaternary. *Primary blast injury* - These injuries result from the **overpressure wave** impacting the body's gas-containing organs, such as **ruptured tympanic membranes**, pulmonary blast injury, and hollow viscus perforation. - They do not typically cause external burns, as they are related to barotrauma rather than thermal energy or kinetic impact. *Tertiary blast injury* - This occurs when the blast wind causes the victim to be **thrown** against a solid object or the ground, leading to **blunt force trauma**, fractures, and amputations. - It is a result of **displacement** of the body, not exposure to thermal energy or shrapnel. *Quaternary blast injury* - This category encompasses **all other injuries** caused by the blast that do not fit into the primary, secondary, or tertiary categories, including **burns**, crush injuries, and exacerbation of pre-existing conditions. - **Thermal burns** are most accurately defined as quaternary blast injuries resulting from flash, incendiary, or chemical sources associated with the explosion.

Q: Which type of injury is characterized by the 'sparrow foot' pattern?

Motor vehicle accident. ***Motor vehicle accident*** - The **'sparrow foot' pattern** (also known as the **crow's foot** or **talipes equinovarus-like** deformity in extreme cases) is a specific injury pattern frequently seen in **motor vehicle accidents** involving pedestrians, particularly due to the bumper impact. - This pattern occurs due to the direct force of a vehicle bumper striking the leg, often causing a comminuted fracture with characteristic radiating fracture lines that resemble the skin markings of a bird's foot. *Bomb blast* - **Bomb blast** injuries typically present with **primary blast injuries** due to overpressure (e.g., tympanic membrane rupture, pulmonary contusion) or **secondary blast injuries** from flying shrapnel. - They do not produce the specific, blunt, linear, or crushing force required to create the characteristic **bumper fracture** patterns such as the 'sparrow foot'. *Contusion* - A **contusion** is a simple **bruise** caused by direct blunt trauma, leading to capillary rupture and ecchymosis without structural fractures or complex patterns. - It lacks the bone-displacing mechanical force signature of high-velocity impacts like those seen in vehicular traffic collisions. *Collision* - While a **collision** is a general term for impact, in forensic medicine, the term is too broad to define specific skeletal injury patterns like the **sparrow foot**. - Specific patterns typically require a more precise analysis of the **mechanism of injury** (e.g., pedestrian-vehicle vs. vehicle-vehicle impact) to be clinically validated.

Q: Match each poison with its characteristic feature: Column I - Poison Column II - Feature A. Carbon monoxide poisoning 1. Smell of bitter almond B. Organophosphorus poisoning 2. Pinpoint pupil with secretions C. Phosphorus poisoning 3. Cherry red discoloration D. Cyanide poisoning 4. Garlicky odour

A-3, B-2, C-4, D-1. ***A-3, B-2, C-4, D-1*** - **Carbon monoxide** poisoning is classic for causing **cherry red discoloration** of the skin and mucous membranes due to the formation of carboxyhemoglobin. **Organophosphorus** poisoning typically presents with **muscarinic symptoms** such as **miosis** (pinpoint pupils) and profuse **secretions** (salivation, lacrimation). - **Phosphorus** poisoning is frequently associated with a distinct **garlicky odour** on the breath. **Cyanide** poisoning is classically associated with the **smell of bitter almonds** on the breath. *A-4, B-2, C-3, D-1* - This option incorrectly associates **Carbon monoxide** with a garlicky odour and **Phosphorus** with cherry red discoloration. - These associations do not align with established toxicological clinical presentations. *A-1, B-2, C-3, D-4* - This incorrectly links **Carbon monoxide** to the smell of bitter almonds and **Cyanide** to a garlicky odour. - The pharmacological and clinical profiles for these poisons are mismatched in this selection. *A-4, B-3, C-1, D-2* - This incorrectly swaps the clinical features of all four poisons listed. - The diagnostic clinical clues (like garlic odor or cherry red skin) are incorrectly attributed to the wrong toxic substances.

Q: A male traveller from Afghanistan is found dead in a hotel room. Autopsy shows the stomach packed with foreign substances. What is this phenomenon called?

Body packing. ***Body packing*** - This term refers to the **intentional ingestion** or **insertion** of drug-filled packets (usually encased in latex or plastic) into body cavities for the purpose of **international drug trafficking**. - These individuals are often referred to as **mules** and are at significant risk of **drug toxicity** if the packets rupture or leak during transit. *Body stuffing* - This involves the **hasty ingestion** of drug packets to avoid arrest, usually when an individual is about to be detained by law enforcement. - Unlike body packing, these packets are typically **poorly packaged** or improvised, leading to a much higher rate of **accidental overdose** and rupture. *Body storage* - This is not a recognized medical or forensic term used to describe the concealment of drugs within the body. - It does not describe any specific mechanism of illicit substance transport or forensic phenomenon. *Body smuggle* - This is a descriptive term for the act of trafficking but is incorrect terminology in forensic pathology for the specific method of ingestion. - The correct forensic classification for ingestion and concealment is **body packing** or **body stuffing** depending on the intent and preparation.

Q: After ingesting a liquid, a patient presents with pinpoint pupils, respiratory depression, excessive salivation, bradycardia, sweating, and lacrimation. What is the treatment of choice?

Atropine. ***Atropine*** - This patient is presenting with a **cholinergic crisis** due to **organophosphate poisoning**, characterized by the **DUMBBELSS** mnemonic (Diarrhea, Urination, Miosis, Bradycardia, Bronchospasm, Emesis, Lacrimation, Salivation, Sweating). - **Atropine** is a **muscarinic antagonist** that acts as the first-line pharmacologic treatment to aggressively reverse the potentially fatal bradycardia and bronchoconstriction caused by excessive acetylcholine. *Pralidoxime* - While **Pralidoxime** (2-PAM) is a specific antidote used in organophosphate poisoning to **regenerate acetylcholinesterase**, it is administered *after* or alongside atropine to treat nicotinic symptoms like muscle weakness. - It is not the first-line treatment for the life-threatening muscarinic symptoms such as respiratory depression and bradycardia that require immediate atropinization. *Flumazenil* - **Flumazenil** is a competitive **GABA receptor antagonist** specifically indicated for the reversal of **benzodiazepine** overdose. - It is contraindicated in this patient because the presentation does not fit benzodiazepine toxicity and it could lower the seizure threshold. *Naloxone* - **Naloxone** is a pure **opioid antagonist** used exclusively for the reversal of **opioid-induced respiratory depression** and sedation. - This patient's symptoms present with **constricted pupils** (miosis), which is seen in opioids, but the presence of excessive secretions (salivation, lacrimation) and bradycardia strongly points to cholinergic toxicity rather than opioid toxicity.

Q: Based on the image, what is the range of the firearm wound?

Distant. ***Distant*** - A distant gunshot wound typically lacks findings of **soot deposition** (smudging) or **stippling** (tattooing) around the wound, which are characteristic of close or intermediate-range shots. - The absence of these abrasion-ring features and lack of muzzle imprint indicate that the firearm was discharged from a range beyond the reach of **flame, smoke, and gunpowder** particles. *Close* - A close-range wound usually exhibits **soot deposition** around the entrance hole due to the smoke and combustion products from the propellant. - The skin may also show singeing of hair or localized **thermal injury** from the hot gases. *Contact* - Contact wounds are characterized by a **muzzle imprint** on the skin and widespread disruption of the tissue from expanding gases. - Subcutaneous **tattoos** or cherry-red discoloration of the muscle may be present due to the high concentration of **carbon monoxide** in the barrel gases. *Exit wound* - An exit wound generally appears irregular, **stellate**, or slit-like, and typically lacks an abrasion collar. - Exit wounds normally do not show any evidence of **soot, stippling, or muzzle imprint**, as the projectile has already lost its energetic additives.

Q: An infant ingests a pesticide. Which drug reverses the acetylcholinesterase block?

Pralidoxime. ***Pralidoxime*** - Pralidoxime acts as a **cholinesterase reactivator** by binding to the phosphorous group of the organophosphate, pulling it off the **acetylcholinesterase enzyme**. - It is crucial for reversing the peripheral muscular effects of **organophosphate poisoning** (such as paralysis) by restoring enzyme function, especially if administered before the **aging process** occurs. *Atropine* - While vital for preventing death in organophosphate poisoning, it is a **muscarinic antagonist** that blocks the effects of acetylcholine at muscarinic receptors (e.g., salivation, bradycardia, bronchospasm). - It does not restore the activity of the **acetylcholinesterase enzyme** itself, meaning it treats the symptoms rather than the root biochemical block. *Flumazenil* - This drug is a **competitive antagonist** at the **GABA-A receptor** used specifically to reverse benzodiazepine overdose. - It has no role in the management of cholinergic crisis or pesticide poisoning and may potentially precipitate seizures in some patients. *Naloxone* - Naloxone is an **opioid receptor antagonist** used primarily for reversing respiratory depression caused by **opioid overdose**. - It interacts with mu, kappa, and delta receptors and possesses no therapeutic mechanism for organophosphate or pesticide toxicity.

Q: Respiratory depression is NOT a feature of which of the following poisonings?

Strychnine. ***Strychnine*** - Strychnine poisoning acts by antagonizing **glycine receptors** in the spinal cord, leading to severe **tetanic convulsions** and **opisthotonus**. - Respiratory compromise in strychnine poisoning is due to **laryngospasm** and prolonged **spasms of respiratory muscles**, rather than direct central nervous system-mediated respiratory depression. *Gelsemium* - Gelsemium contains toxins like **gelsemine** and **sempervirine** that act as potent neurotoxins. - It causes peripheral neuromuscular blockade and centrally mediated **respiratory paralysis**, which is the primary cause of death. *Opium* - Opium contains opioids like **morphine** that act on **mu-opioid receptors** in the brainstem. - This directly suppresses the **medullary respiratory center**, leading to characteristic **respiratory depression** and decreased respiratory rate. *Dhatura* - While Dhatura (containing **atropine** and **scopolamine**) often causes tachycardia and delirium, it can lead to **respiratory failure** in severe cases due to central medullary depression or the effects of status epilepticus. - It is classified as a deliriant poison; while respiratory failure is a late effect rather than a primary hallmark, it is recognized as a potential mechanism of death compared to the convulsant mechanism of strychnine.

Q: A child presents with hypotension, respiratory depression, and pinpoint pupils. What is the most appropriate antidote?

Naloxone. ***Naloxone*** - This agent is the **opioid receptor antagonist** of choice for reversing acute opioid toxicity, which classically presents with the triad of **respiratory depression**, **CNS depression (coma)**, and **miosis (pinpoint pupils)**. - It has a short half-life, making it suitable for emergency reversal, though patients must be monitored for the recurrence of opioid effects as the antagonist wears off. *Flumazenil* - This is a specific antagonist for **benzodiazepine receptor** toxicity and is used to reverse sedation from benzodiazepines. - It is contraindicated in patients with suspected mixed overdose or chronic benzodiazepine use due to the high risk of precipitating **seizures**. *Naltrexone* - This is an **opioid receptor antagonist**, but it has a much longer duration of action and is primarily used for the long-term maintenance treatment of **opioid dependence** and alcohol use disorder. - It is not suitable for acute emergency management of overdose because it does not provide the rapid-onset reversal needed in life-threatening respiratory depression. *Atropine* - This is a **muscarinic acetylcholine receptor antagonist** used primarily in the treatment of organophosphate poisoning (cholinergic toxicity) or symptomatic bradycardia. - It would worsen the miosis and CNS depression seen in this child and provides no benefit for opioid-induced respiratory depression.

Q: A patient has sudden painful loss of vision with RAPD but a normal-appearing optic disc on fundoscopy. What is the diagnosis?

Retrobulbar neuritis. ***Retrobulbar neuritis*** - This condition presents with **acute, painful loss of vision** and an **afferent pupillary defect (RAPD)**, while the fundoscopic exam appears normal initially because the inflammation is located behind the optic nerve head. - It is a common manifestation of **multiple sclerosis** and requires careful neurologic evaluation for demyelinating disease. *AION* - Anterior Ischemic Optic Neuropathy typically presents with **painless** loss of vision. - Fundoscopy reveals an **edematous, swollen optic disc** (or disc at risk), unlike the normal-appearing disc found in retrobulbar neuritis. *Central retinal artery occlusion* - This condition presents with **painless**, sudden vision loss and a characteristic **cherry-red spot** on the macula. - Fundoscopy typically shows a **pale retina** due to ischemia rather than a normal-appearing optic nerve head. *Papilledema* - This presents with bilateral optic disc swelling due to **raised intracranial pressure**, usually without acute, sudden loss of vision. - Visual acuity is generally **preserved** in the early stages, unlike the significant loss seen in optic neuritis.

Question 1

Following an explosion, a person sustained burns to the face and chest. What type of blast
injury is this?

Accepted Answer

Secondary blast injury

Answer

Primary blast injury

Answer

Tertiary blast injury

Answer

Quaternary blast injury

Question 2

Which type of injury is characterized by the 'sparrow foot' pattern?

Accepted Answer

Motor vehicle accident

Answer

Bomb blast

Answer

Contusion

Answer

Collision

Question 3

Match each poison with its characteristic feature:

Column I - Poison Column II - Feature
A. Carbon monoxide poisoning 1. Smell of bitter almond
B. Organophosphorus poisoning 2. Pinpoint pupil with secretions
C. Phosphorus poisoning 3. Cherry red discoloration
D. Cyanide poisoning 4. Garlicky odour

Accepted Answer

A-3, B-2, C-4, D-1

Answer

A-4, B-2, C-3, D-1

Answer

A-1, B-2, C-3, D-4

Answer

A-4, B-3, C-1, D-2

Question 4

A male traveller from Afghanistan is found dead in a hotel room. Autopsy shows the stomach
packed with foreign substances. What is this phenomenon called?

Accepted Answer

Body packing

Answer

Body stuffing

Answer

Body storage

Answer

Body smuggle

Question 5

After ingesting a liquid, a patient presents with pinpoint pupils, respiratory depression,
excessive salivation, bradycardia, sweating, and lacrimation. What is the treatment of choice?

Accepted Answer

Atropine

Answer

Pralidoxime

Answer

Flumazenil

Answer

Naloxone

Question 6

Based on the image, what is the range of the firearm
wound?

Accepted Answer

Distant

Answer

Close

Answer

Contact

Answer

Exit wound

Question 7

An infant ingests a pesticide. Which drug reverses the
acetylcholinesterase block?

Accepted Answer

Pralidoxime

Answer

Atropine

Answer

Flumazenil

Answer

Naloxone

Question 8

Respiratory depression is NOT a feature of which of the following poisonings?

Accepted Answer

Strychnine

Answer

Gelsemium

Answer

Opium

Answer

Dhatura

Question 9

A child presents with hypotension, respiratory depression, and pinpoint pupils. What is the most
appropriate antidote?

Accepted Answer

Naloxone

Answer

Flumazenil

Answer

Naltrexone

Answer

Atropine

Question 10

A patient has sudden painful loss of vision with RAPD but a normal-appearing optic disc on
fundoscopy. What is the diagnosis?

Accepted Answer

Retrobulbar neuritis

Answer

AION

Answer

Central retinal artery occlusion

Answer

Papilledema

INI-CET 2026

Forensic Medicine

Ophthalmology