Vascular Trauma — MCQs
Bullet wounds near major blood vessels should be explored only if -
Falsely elevated ankle brachial index is used for evaluation of?
Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
The first and the most important measure in the management of a severely injured patient is to:
What is the Investigation of Choice (IOC) for Acute Aortic Dissection?
What is the best procedure to control external hemorrhage in an event of accidental injury?
When a seat belt is worn, if an accident occurs, sudden deceleration can result in:
In a blast injury, which of the following organs is most vulnerable?
Which of the following does not cause deep venous thrombosis (DVT)?
Gettler's test is for -
Vascular Trauma Indian Medical PG Practice Questions and MCQs
Question 1: Bullet wounds near major blood vessels should be explored only if -
- A. The wound is in close proximity to a major blood vessel
- B. There is any suspicion of possible vascular involvement
- C. Routine exploration is indicated for all penetrating wounds near vessels
- D. There are hard signs of vascular injury (active hemorrhage, expanding hematoma, absent distal pulses, palpable thrill/bruit) (Correct Answer)
Explanation: ***There are hard signs of vascular injury (active hemorrhage, expanding hematoma, absent distal pulses, palpable thrill/bruit)*** - **Hard signs** indicate a high likelihood of significant vascular trauma requiring immediate surgical exploration to prevent severe complications such as limb ischemia or exsanguination. - These signs include **active pulsatile hemorrhage**, rapidly **expanding hematoma**, **absent or diminished distal pulses**, presence of a **thrill or bruit**, and **signs of distal ischemia**. *The wound is in close proximity to a major blood vessel* - Proximity alone is a **soft sign** of vascular injury and warrants further investigation, but not immediate routine surgical exploration. - Many wounds near major vessels do not result in vascular injury; direct exploration without other indications would lead to unnecessary surgeries. *There is any suspicion of possible vascular involvement* - **Suspicion** would prompt diagnostic imaging (e.g., CT angiography) or observation, but not an immediate surgical exploration unless hard signs are present. - Suspicions can be based on soft signs such as a stable hematoma, history of significant bleeding at the scene, or bony injury near a vessel. *Routine exploration is indicated for all penetrating wounds near vessels* - **Routine exploration** of all penetrating wounds near vessels is not recommended as it carries risks of iatrogenic injury and surgical complications, and many such wounds do not involve vascular damage. - Clinical guidelines emphasize selective management based on signs and symptoms, differentiating between hard and soft signs of injury to guide intervention.
Question 2: Falsely elevated ankle brachial index is used for evaluation of?
- A. Deep vein thrombosis
- B. Acute limb ischemia
- C. Calcified vessels (Correct Answer)
- D. Chronic venous insufficiency
Explanation: A falsely elevated **ankle-brachial index (ABI)**, often >1.3, indicates that the **ankle arteries are non-compressible** due to calcification [1]. This calcification is common in conditions like **diabetes** and **end-stage renal disease**, where the vessels become stiff and resist compression, leading to inaccurate pressure readings [1].
Question 3: Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
- A. Ultrasonography (FAST)
- B. Diagnostic peritoneal lavage (DPL)
- C. MRI (Magnetic Resonance Imaging)
- D. CT Scan (Computed Tomography) (Correct Answer)
Explanation: ***CT Scan (Computed Tomography)*** - **CT scans** offer superior anatomical detail and can accurately detect organ damage, hemorrhage, and other injuries in **hemodynamically stable** patients with abdominal trauma. - It is considered the **most sensitive** and specific imaging modality for evaluating blunt and penetrating abdominal trauma when the patient can tolerate the study. *Ultrasonography (FAST)* - While effective for detecting **free fluid** (blood) in specific abdominal areas, **Focused Assessment with Sonography for Trauma (FAST)** has lower sensitivity for solid organ injuries or bowel perforations. - Its primary role is rapid assessment for **hemoperitoneum** to guide immediate management in unstable patients, not detailed injury characterization. *Diagnostic peritoneal lavage (DPL)* - **DPL** is an invasive procedure with high sensitivity for detecting **intraperitoneal bleeding**, but it does not identify specific organ injuries or retroperitoneal hemorrhage. - It is rarely used in hemodynamically stable patients due to its invasiveness and the availability of more detailed imaging techniques. *MRI (Magnetic Resonance Imaging)* - **MRI** provides excellent soft tissue contrast but is typically too **time-consuming** and less accessible in urgent trauma settings compared to CT. - It's generally not the first-line investigation for acute abdominal trauma due to motion artifacts and limited utility in detecting air or bone injuries.
Question 4: The first and the most important measure in the management of a severely injured patient is to:
- A. Splinting fractures
- B. Arrest bleeding
- C. Start I.V. fluids
- D. To maintain airway (Correct Answer)
Explanation: ***To maintain airway*** - Establishing a **patent airway** is the absolute first step in managing any severely injured patient, as **airway compromise** can rapidly lead to hypoxia and death. - The ABCDE (Airway, Breathing, Circulation, Disability, Exposure) approach to trauma prioritizes **airway management** immediately to ensure oxygenation. *Splinting fractures* - While important for pain control and preventing further injury, **splinting fractures** is not the immediate priority over securing an airway. - This intervention falls under the 'D' (disability) or 'E' (exposure) in the primary survey of trauma care. *Arrest bleeding* - **Controlling severe external bleeding** is critical, but only after an **airway has been secured** and any immediate life-threatening breathing problems addressed. - Uncontrolled hemorrhage is a major cause of preventable death in trauma, but **airway patency** precedes it as per trauma protocols. *Start I.V. fluids* - Initiating **intravenous fluids** is crucial for resuscitating patients in shock due to blood loss. - However, it comes after ensuring a **patent airway** and adequate breathing, as per the ATLS guidelines for trauma management.
Question 5: What is the Investigation of Choice (IOC) for Acute Aortic Dissection?
- A. USG
- B. Doppler
- C. CT-Angio (Correct Answer)
- D. MR-Angio
Explanation: ***CT-angio*** - **Computed tomography angiography (CTA)** is considered the **gold standard** imaging modality for diagnosing acute aortic dissection due to its rapid acquisition, wide availability, and excellent visualization of the aorta and its branches. - It precisely demonstrates the **intimal flap**, true and false lumens, and assesses the extent of the dissection and involvement of major branch vessels. *Usg* - **Ultrasound (USG)**, specifically **transesophageal echocardiography (TEE)**, is highly sensitive and specific for proximal aortic dissections. - However, its utility is operator-dependent and it has limitations in visualizing the entire aorta, especially the distal descending aorta. *Doppler* - **Doppler ultrasound** is used to assess blood flow velocity and patterns within vessels. - While it can detect flow disturbances, it is not the primary imaging modality for diagnosing the anatomical extent and characteristics of an aortic dissection flap. *Mr-Angio* - **Magnetic resonance angiography (MRA)** provides excellent soft tissue contrast, no radiation exposure, and detailed anatomical information for aortic dissection. - However, it is often less accessible, time-consuming, and contraindicated in patients with certain metallic implants or claustrophobia, making it less ideal for an acute emergency setting compared to CTA.
Question 6: What is the best procedure to control external hemorrhage in an event of accidental injury?
- A. Proximal tourniquet
- B. Artery forceps
- C. Elevation
- D. Direct pressure (Correct Answer)
Explanation: ***Direct pressure*** - **Direct pressure** is the most immediate and effective first-aid measure for controlling external bleeding by compressing the injured vessel. - Applying firm, direct pressure with a clean cloth or hand helps to promote **hemostasis** and allow for clot formation at the site of injury. *Proximal tourniquet* - A **tourniquet** is a last resort for severe, life-threatening hemorrhage that cannot be controlled by direct pressure, as it can cause **tissue damage** and ischemia. - It should be applied proximal to the injury, but its prolonged use carries risks of **nerve damage** and limb loss. *Artery forceps* - **Artery forceps** are surgical instruments used to clamp individual blood vessels during a surgical procedure, not for initial control of external hemorrhage in an emergency. - Their use requires expertise and carries risks of further injury if not applied correctly by trained medical personnel. *Elevation* - **Elevation** of the injured limb above the level of the heart can help reduce blood flow and venous pressure, which may aid in controlling minor bleeding. - However, elevation alone is usually insufficient for significant hemorrhage and should be used in conjunction with **direct pressure**.
Question 7: When a seat belt is worn, if an accident occurs, sudden deceleration can result in:
- A. Rupture of mesentery (Correct Answer)
- B. Liver injury
- C. Spleen injury
- D. Vertebral injury
Explanation: ***Rupture of mesentery*** - The **lap belt** component of a seatbelt causes compression and shear forces across the abdomen during sudden deceleration, leading to the classic **"seatbelt sign"** (abdominal wall ecchymosis). - This mechanism commonly causes **mesenteric tears** and bowel injuries, which represent the **most frequent intra-abdominal injuries** in the seatbelt syndrome. - Mesenteric avulsion can lead to bowel ischemia and perforation, making it a critical injury to identify in restrained trauma patients. *Liver injury* - While liver injury can occur in motor vehicle accidents, it is **less specifically associated** with the seatbelt mechanism. - Liver lacerations typically result from **direct impact** or compression against the rib cage, and are actually **reduced in incidence** with proper seatbelt use compared to unrestrained occupants. - Not a characteristic finding of the seatbelt injury complex. *Spleen injury* - Splenic trauma is similarly more common with **direct lateral impact** to the left upper quadrant rather than the anterior compression from a lap belt. - Proper seatbelt restraint generally **protects** against severe splenic injury compared to unrestrained passengers. - Not part of the classic seatbelt syndrome. *Vertebral injury* - The **Chance fracture** (horizontal fracture-dislocation of the lumbar spine) is indeed a **recognized component of seatbelt syndrome**, caused by flexion-distraction forces over the fulcrum of the lap belt. - However, in the context of seatbelt injuries, **soft tissue injuries** (mesentery, bowel) are **more common** than bony Chance fractures. - When evaluating the "seatbelt complex," mesenteric injury is the **primary visceral injury** to suspect, while Chance fracture represents the associated skeletal injury pattern. - This question focuses on the most characteristic and frequent injury pattern.
Question 8: In a blast injury, which of the following organs is most vulnerable?
- A. Lungs (Correct Answer)
- B. GI tract
- C. Ear drum
- D. Liver
Explanation: ***Lungs*** - The **lungs** are the most vulnerable organ to life-threatening primary blast injury due to their air-filled structure, which makes them highly susceptible to barotrauma from the blast wave. - Blast waves cause rapid pressure changes leading to pulmonary contusion, hemorrhage, pneumothorax, air embolism, and blast lung syndrome—the most lethal primary blast injury. - Clinically, pulmonary blast injury carries the highest morbidity and mortality among primary blast injuries. *GI tract* - The **gastrointestinal tract**, particularly air-filled segments (colon, small bowel), can be affected by blast injuries causing perforations, hemorrhage, or contusions. - However, GI injuries are less common and generally less immediately life-threatening compared to pulmonary blast injuries. *Ear drum* - The **tympanic membrane (eardrum)** is the most sensitive structure to pressure changes and ruptures at the lowest pressure threshold (5 psi), often being the first injury in a blast. - While eardrum rupture serves as an important marker of blast exposure, it is rarely life-threatening and causes primarily hearing loss rather than systemic injury. *Liver* - The **liver** is a solid organ and is relatively resistant to primary blast wave effects compared to air-filled structures. - Hepatic injuries from blasts typically result from secondary mechanisms (projectiles, fragments) or tertiary injuries (blunt trauma from displacement) rather than the primary blast wave itself.
Question 9: Which of the following does not cause deep venous thrombosis (DVT)?
- A. Lower limb trauma
- B. Subungual hematoma (Correct Answer)
- C. Hip & pelvic surgeries
- D. Cushing's syndrome
Explanation: ***Subungual hematoma*** - A **subungual hematoma** is a collection of blood under the fingernail or toenail, usually caused by trauma. - It is a localized injury that **does not affect systemic coagulation** or venous blood flow, thus not increasing DVT risk. *Lower limb trauma* - **Trauma to the lower limb**, especially involving fractures or significant soft tissue damage, can lead to **venous stasis** due to immobility and direct vessel injury [1]. - This immobility and vessel damage activate the **coagulation cascade**, significantly increasing the risk of DVT [1]. *Cushing's syndrome* - **Cushing's syndrome** is characterized by **hypercortisolism**, which leads to a **hypercoagulable state**. - **Elevated cortisol levels** increase circulating procoagulant factors and decrease fibrinolytic activity, predisposing patients to DVT. *Hip & pelvic surgeries* - **Major surgeries**, particularly those involving the **hip and pelvis**, frequently cause **endothelial injury**, blood stasis, and activate the coagulation system [1]. - Patients undergoing these procedures are at a **very high risk for DVT** due to prolonged immobility and surgical trauma [1].
Question 10: Gettler's test is for -
- A. Carbon monoxide poisoning
- B. Cyanide poisoning
- C. Alcohol poisoning
- D. Drowning (Correct Answer)
Explanation: ***Drowning*** - Gettler's test (also called the **diatom test**) is a **forensic test** used to diagnose drowning. - It involves detecting **diatoms** (microscopic algae present in water bodies) in body tissues and organs such as **bone marrow, liver, kidneys, and lungs**. - The presence of diatoms in **closed organs** (especially bone marrow) indicates that the person was **alive when they entered the water** and inhaled water containing diatoms, which then entered circulation. - This helps differentiate **true drowning** from a body dumped in water after death (postmortem submersion). *Carbon monoxide poisoning* - Carbon monoxide poisoning is diagnosed by measuring **carboxyhemoglobin (CO-Hb) levels** using spectroscopic analysis or blood gas analysis. - Classic finding is **cherry-red discoloration** of blood and tissues due to CO-Hb formation. - Gettler's test is **not used** for CO poisoning detection. *Cyanide poisoning* - Cyanide poisoning is diagnosed by **blood cyanide levels** or clinical findings like **bitter almond odor** of breath. - Gettler's test has **no role** in cyanide detection. *Alcohol poisoning* - Alcohol intoxication is diagnosed by measuring **blood alcohol concentration (BAC)** using gas chromatography or enzymatic methods. - Gettler's test is **not used** for alcohol detection.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free