Surgical wound classification US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Surgical wound classification. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Surgical wound classification US Medical PG Question 1: The surgical equipment used during a craniectomy is sterilized using pressurized steam at 121°C for 15 minutes. Reuse of these instruments can cause transmission of which of the following pathogens?
- A. Non-enveloped viruses
- B. Sporulating bacteria
- C. Prions (Correct Answer)
- D. Enveloped viruses
- E. Yeasts
Surgical wound classification Explanation: ***Prions***
- Prions are **abnormally folded proteins** that are highly resistant to standard sterilization methods like steam autoclaving at 121°C, making them a risk for transmission through reused surgical instruments.
- They cause transmissible spongiform encephalopathies (TSEs) like **Creutzfeldt-Jakob disease**, where even trace amounts can be highly infectious.
*Non-enveloped viruses*
- Non-enveloped viruses are generally **more resistant to heat and disinfectants** than enveloped viruses but are typically inactivated by recommended steam sterilization protocols.
- Standard autoclaving conditions are effective in destroying most non-enveloped viruses.
*Sporulating bacteria*
- **Bacterial spores**, such as those from *Clostridium* or *Bacillus*, are known for their high resistance to heat and chemicals, but are usually **inactivated by steam sterilization at 121°C** for 15 minutes.
- This method is specifically designed to kill bacterial spores effectively.
*Enveloped viruses*
- Enveloped viruses are the **least resistant to heat and chemical disinfectants** due to their lipid envelope.
- They are readily **inactivated by standard steam sterilization** at 121°C.
*Yeasts*
- **Yeasts** are eukaryotic microorganisms that are typically **susceptible to heat sterilization**.
- They are effectively killed by typical steam autoclaving conditions used for surgical instruments.
Surgical wound classification US Medical PG Question 2: Two hours after admission to the intensive care unit, a 56-year-old man with necrotizing pancreatitis develops profound hypotension. His blood pressure is 80/50 mm Hg and he is started on vasopressors. A central venous access line is placed. Which of the following is most likely to decrease the risk of complications from this procedure?
- A. Placement of the central venous line in the femoral vein
- B. Replacement of the central venous line every 7-10 days
- C. Initiation of anticoagulation after placement
- D. Preparation of the skin with chlorhexidine and alcohol (Correct Answer)
- E. Initiation of periprocedural systemic antibiotic prophylaxis
Surgical wound classification Explanation: ***Preparation of the skin with chlorhexidine and alcohol***
- **Chlorhexidine** with alcohol is the most effective skin antiseptic for preventing **catheter-related bloodstream infections (CRBSIs)** by significantly reducing skin microbial counts.
- Proper skin preparation is a cornerstone of preventing **infectious complications** associated with central venous catheter insertion.
*Placement of the central venous line in the femoral vein*
- The femoral site is generally associated with a **higher risk of infection** and **deep venous thrombosis** compared to subclavian or internal jugular sites in adult patients.
- Femoral access is often reserved for situations where other sites are inaccessible or contraindicated, due to its **less favorable complication profile**.
*Replacement of the central venous line every 7-10 days*
- Routine replacement of central venous lines at fixed intervals, without clinical indication, has **not been shown to reduce infection rates**.
- This practice can actually **increase the risk** of mechanical complications and introduce new opportunities for infection with each procedure.
*Initiation of anticoagulation after placement*
- Routine systemic **anticoagulation** after central venous line placement is generally **not recommended** due to an increased risk of **bleeding complications**.
- Anticoagulation is typically reserved for specific indications such as documented **catheter-related thrombosis**.
*Initiation of periprocedural systemic antibiotic prophylaxis*
- Routine **systemic antibiotic prophylaxis** is **not recommended** for central venous catheter insertion as it promotes **antibiotic resistance** without significantly reducing CRBSIs.
- Strict adherence to **aseptic technique** and proper skin antisepsis are more effective for preventing infections.
Surgical wound classification US Medical PG Question 3: During the examination of a gunshot wound, the forensic pathologist notes an entrance wound with abrasion collar and soot deposition. The wound shows a stellate-shaped pattern with irregular margins. This pattern most likely indicates which of the following?
- A. Ricochet injury
- B. Long-range firing
- C. Intermediate-range firing
- D. Contact wound (Correct Answer)
Surgical wound classification Explanation: ***Contact wound***
- A **stellate-shaped pattern with irregular margins** is the pathognomonic feature of a **contact wound** where the muzzle is pressed directly against the skin.
- When the weapon is fired in contact with skin, **hot gases expand beneath the skin surface**, causing it to burst outward in a characteristic **stellate or cruciate laceration pattern**.
- The presence of **soot deposition** and **abrasion collar** further supports a contact or near-contact gunshot wound.
- In contact wounds over bone (e.g., skull), the stellate pattern is most pronounced due to resistance from underlying bone.
*Intermediate-range firing*
- **Intermediate-range firing** (typically 6 inches to 3 feet) shows **powder tattooing** (stippling) and may show soot deposition around a round or oval entrance wound.
- However, intermediate-range wounds do **NOT produce stellate-shaped patterns** because the gases disperse before impact and don't expand beneath the skin.
- The entrance wound remains relatively round with surrounding powder stippling.
*Ricochet injury*
- A **ricochet injury** has an irregular, asymmetrical entrance wound due to bullet deformation and altered trajectory after striking another surface.
- Would not show the characteristic stellate pattern or typical soot distribution of direct firing.
*Long-range firing*
- **Long-range firing** produces only a clean entrance wound with an **abrasion collar**, without soot or powder tattooing.
- The distance is too great for combustion byproducts to reach the target.
- The wound is typically round or oval without stellate laceration.
Surgical wound classification US Medical PG Question 4: A 43-year-old woman comes to the physician because of a 3-month history of a painless ulcer on the sole of her right foot. There is no history of trauma. She has been dressing the ulcer once daily at home with gauze. She has a 15-year history of poorly-controlled type 1 diabetes mellitus and hypertension. Current medications include insulin and lisinopril. Vital signs are within normal limits. Examination shows a 2 x 2-cm ulcer on the plantar aspect of the base of the great toe with whitish, loose tissue on the floor of the ulcer and a calloused margin. A blunt metal probe reaches the deep plantar space. Sensation to vibration and light touch is decreased over both feet. Pedal pulses are intact. An x-ray of the right foot shows no abnormalities. Which of the following is the most appropriate initial step in management?
- A. Surgical revascularization of the right foot
- B. Amputation of the right forefoot
- C. Total contact casting of right foot
- D. Intravenous antibiotic therapy
- E. Sharp surgical debridement of the ulcer (Correct Answer)
Surgical wound classification Explanation: ***Sharp surgical debridement of the ulcer***
- The presence of a **painless ulcer**, decreased sensation (neuropathy), and a calloused margin with loose tissue indicates a **neuropathic ulcer** common in diabetic patients. **Sharp surgical debridement** is crucial to remove non-viable tissue and promote healing.
- The probe reaching the deep plantar space suggests a potential deep infection or osteomyelitis, which needs aggressive debridement to remove all infected and necrotic tissue. However, since the X-ray is normal, it is less likely to have osteomyelitis, but it needs to be ruled out by further investigations.
*Surgical revascularization of the right foot*
- This is primarily indicated for **ischemic ulcers** where blood supply is compromised.
- The patient has **intact pedal pulses**, meaning good distal blood flow, making revascularization unnecessary at this stage.
*Amputation of the right forefoot*
- Amputation is a measure of last resort for **severe, non-healing ulcers** with extensive infection or gangrene that fail to respond to conservative and surgical debridement.
- The current presentation does not warrant such an extreme intervention as a first step.
*Total contact casting of right foot*
- **Total contact casting** is used for **off-loading pressure** from a neuropathic ulcer to facilitate healing.
- While it's an important step in management, it should generally follow **debridement** to ensure a clean wound bed.
*Intravenous antibiotic therapy*
- This is indicated if there are definitive signs of **spreading infection** (e.g., cellulitis, fever, purulence).
- While debridement helps prevent infection by removing necrotic tissue, there is no mention of systemic signs of infection or severe local infection requiring immediate IV antibiotics.
Surgical wound classification US Medical PG Question 5: A 16-year-old boy presents to the emergency department after a skateboarding accident. He fell on a broken bottle and received a 4 cm wound on the dorsal aspect of his left hand. His vitals are stable and he was evaluated by the surgeon on call who determined that suturing was not required. After several weeks the wound has almost completely healed (see image). Which of the following is the correct description of this patient's wound before healing?
- A. Incised wound (Correct Answer)
- B. Abrasion
- C. Laceration
- D. Avulsion
- E. Puncture
Surgical wound classification Explanation: ***Incised wound***
- An **incised wound** is caused by a sharp object, such as a broken bottle, resulting in a clean, straight cut with well-defined edges and minimal tissue damage.
- The characteristics of the injury (sharp object mechanism, 4 cm linear wound) and the clinical decision that suturing was not required suggest a relatively clean incised wound with edges that could approximate well.
- Incised wounds typically heal with **fine linear scars** as shown in the image, especially when the edges are well-approximated.
*Abrasion*
- An abrasion is a **superficial wound** caused by friction or scraping, leading to removal of the epidermis and sometimes the superficial dermis.
- This mechanism does not match the described injury from a broken bottle, and abrasions produce broad, shallow wounds rather than deep linear cuts.
- Abrasions heal with minimal scarring and would not produce the linear scar pattern shown.
*Laceration*
- A laceration is a wound with **irregular, torn edges** typically caused by blunt force trauma or crushing injury.
- While broken glass can sometimes cause lacerations, the description of a clean "4 cm wound" from falling on a broken bottle more strongly suggests a sharp cutting mechanism rather than tearing.
- Lacerations have jagged edges with more tissue damage and typically require debridement or careful closure.
*Avulsion*
- An **avulsion** involves forcible tearing away of tissue, often resulting in significant tissue loss with irregular, gaping wounds.
- This injury pattern is much more severe than described and would typically require complex surgical management, including possible skin grafting.
- The mechanism (falling on broken glass) and the relatively straightforward healing do not support an avulsion injury.
*Puncture*
- A puncture wound is caused by a **pointed object** penetrating the skin, creating a small entry hole with depth greater than width.
- The description of a "4 cm wound" indicates a linear length, not a deep narrow penetration typical of puncture wounds.
- Puncture wounds carry high infection risk and would not produce the linear scar pattern shown in the image.
Surgical wound classification US Medical PG Question 6: A previously healthy 5-year-old boy is brought to the emergency department 15 minutes after sustaining an injury to his right hand. His mother says that she was cleaning the bathroom when he accidentally knocked over the drain cleaner bottle and spilled the liquid onto his hand. On arrival, he is crying and holding his right hand in a flexed position. His temperature is 37.7°C (99.8°F), pulse is 105/min, respirations are 25/min, and blood pressure is 105/65 mm Hg. Examination of the right hand shows a 4 x 4 cm area of reddened, blistered skin. The area is very tender to light touch. His ability to flex and extend the right hand are diminished. Radial pulses are palpable. Capillary refill time is less than 3 seconds. Which of the following is the most appropriate next step in management?
- A. Irrigate with water (Correct Answer)
- B. Apply split-thickness skin graft
- C. Apply silver sulfadiazine
- D. Apply mineral oil
- E. Perform escharotomy
Surgical wound classification Explanation: ***Irrigate with water***
- The immediate and most crucial step for a **chemical burn** is copious **irrigation with water** to remove the offending agent and prevent further tissue damage.
- This action minimizes the duration of contact between the **corrosive substance** and the skin, halting the chemical reaction.
*Apply split-thickness skin graft*
- A **skin graft** is a surgical procedure typically reserved for **deep burns** and is not the immediate first step for chemical exposure.
- It would be considered later in management if the burn resulted in **full-thickness tissue loss** and incomplete wound healing.
*Apply silver sulfadiazine*
- **Silver sulfadiazine** is an antimicrobial cream used to prevent infection in **thermal burns** after initial wound care.
- It is not indicated as the first line of treatment for a **chemical burn** and would not remove the chemical agent from the skin.
*Apply mineral oil*
- Applying **mineral oil** is not the appropriate initial treatment for a **chemical burn** and could potentially trap the chemical, worsening the injury.
- The priority is to dilute and remove the chemical, which mineral oil cannot do effectively.
*Perform escharotomy*
- An **escharotomy** is a surgical incision through burn eschar used to relieve pressure in **circumferential full-thickness burns** that compromise circulation.
- This procedure is not indicated as the initial management for a **chemical burn** and is only considered for severe, deep burns with vascular compromise.
Surgical wound classification US Medical PG Question 7: A 38-year-old, working, first-time mother brings her 9-month-old male infant to the pediatrician for "wounds that simply won't heal" and bleeding gums. She exclaims, "I have been extra careful with him making sure to not let him get dirty, I boil his baby formula for 15 minutes each morning before I leave for work to give to the caregiver, and he has gotten all of his vaccinations." This infant is deficient in a molecule that is also an essential co-factor for which of the following reactions?
- A. Conversion of homocysteine to methionine
- B. Conversion of alpha ketoglutarate to succinyl-CoA
- C. Conversion of dopamine to norepinephrine (Correct Answer)
- D. Conversion of pyruvate to acetyl-CoA
- E. Conversion of pyruvate to oxaloacetate
Surgical wound classification Explanation: ***Conversion of dopamine to norepinephrine***
- The infant's symptoms of "wounds that simply won't heal" and **bleeding gums** are classic signs of **scurvy**, caused by a deficiency in **vitamin C (ascorbic acid)**.
- **Vitamin C** is an essential cofactor for **dopamine beta-hydroxylase**, the enzyme responsible for converting **dopamine to norepinephrine**.
*Conversion of homocysteine to methionine*
- This reaction is catalyzed by **methionine synthase**, which requires **vitamin B12** (cobalamin) and **folate (vitamin B9)** as cofactors.
- Deficiency in these vitamins would lead to **megaloblastic anemia** and neurological symptoms, not delayed wound healing and bleeding gums.
*Conversion of alpha ketoglutarate to succinyl-CoA*
- This step in the **Krebs cycle** is catalyzed by **alpha-ketoglutarate dehydrogenase**, which requires **thiamine (vitamin B1)**, **lipoic acid**, **Mg2+**, **NAD+**, and **FAD** as cofactors.
- Thiamine deficiency can cause **beriberi** or **Wernicke-Korsakoff syndrome**, not scurvy symptoms.
*Conversion of pyruvate to acetyl-CoA*
- This reaction is catalyzed by the **pyruvate dehydrogenase complex**, which requires **thiamine (vitamin B1)**, **lipoic acid**, **coenzyme A**, **FAD**, and **NAD+** as cofactors.
- A deficiency in any of these, particularly thiamine, leads to impaired carbohydrate metabolism and lactic acidosis.
*Conversion of pyruvate to oxaloacetate*
- This reaction is catalyzed by **pyruvate carboxylase**, which requires **biotin (vitamin B7)** as a cofactor and is essential for **gluconeogenesis**.
- Biotin deficiency is rare and can present with dermatitis, hair loss, and neurological symptoms, not the classic signs of scurvy.
Surgical wound classification US Medical PG Question 8: A 15-year-old boy is brought to the emergency department by ambulance after his mother found him having muscle spasms and stiffness in his room. His mother stated he scraped his foot on a rusty razor on the bathroom floor 2 days prior. On presentation, his temperature is 102.0°F (38.9°C), blood pressure is 108/73 mmHg, pulse is 122/min, and respirations are 18/min. On physical exam, he is found to have severe muscle spasms and rigid abdominal muscles. In addition, he has a dirty appearing wound on his right foot. The patient's mother does not recall any further vaccinations since age 12. Finally, he is found to have difficulty opening his mouth so he is intubated. Which of the following treatment(s) should be provided to this patient?
- A. Wound debridement and antitoxin
- B. Antitoxin
- C. Wound debridement
- D. Wound debridement and booster vaccine
- E. Wound debridement, antitoxin, and booster vaccine (Correct Answer)
Surgical wound classification Explanation: ***Wound debridement, antitoxin, and booster vaccine***
- The patient presents with classic symptoms of **tetanus** (muscle spasms, stiffness, trismus, fever) following a contaminated wound, and an uncertain vaccination history.
- **Wound debridement** removes the source of toxin production, **antitoxin** (tetanus immune globulin) neutralizes circulating toxin, and a **booster vaccine** provides active immunity against future infections.
*Wound debridement and antitoxin*
- While **wound debridement** and **antitoxin** are critical for acute management, omitting the booster vaccine leaves the patient vulnerable to future tetanus infections.
- A booster dose is essential to stimulate the patient's own immune system and provide **long-term immunity**, especially with a history of unknown vaccination status.
*Antitoxin*
- Administering only **antitoxin** would neutralize circulating toxins but would not address the ongoing production of toxins from the contaminated wound.
- It also wouldn't provide **active immunization** to protect against future exposures.
*Wound debridement*
- **Wound debridement** alone removes the bacterial source but does not neutralize the already circulating **tetanus toxin**, which is responsible for the severe neurological symptoms.
- It also fails to provide immediate passive immunity with antitoxin or active immunization with a booster.
*Wound debridement and booster vaccine*
- This option correctly addresses removing the source and providing active immunity but critically misses the immediate need for **antitoxin** to neutralize existing toxins and alleviate the life-threatening symptoms.
- The **tetanus toxin** acts rapidly, and prompt neutralization is crucial to prevent further neurological damage and improve prognosis.
Surgical wound classification US Medical PG Question 9: A 39-year-old man comes to the physician for a follow-up examination. He was treated for a urinary tract infection with trimethoprim-sulfamethoxazole 2 months ago. He is paraplegic as a result of a burst lumbar fracture that occurred after a fall 5 years ago. He has hypertension and type 2 diabetes mellitus. Current medications include enalapril and metformin. He performs clean intermittent catheterization daily. He has smoked one pack of cigarettes daily for 19 years. His temperature is 37.1°C (98.8°F), pulse is 95/min, respirations are 14/min, and blood pressure is 120/80 mm Hg. He appears malnourished. Examination shows palpable pedal pulse. Multiple dilated tortuous veins are present over both lower extremities. There is a 2-cm wound surrounded by partial-thickness loss of skin and a pink wound bed over the right calcaneum. Neurologic examination shows paraparesis. His hemoglobin A1c is 6.5%, and fingerstick blood glucose concentration is 134 mg/dL. Which of the following is most likely to have prevented this patient's wound?
- A. Broad-spectrum antibiotic therapy
- B. Cessation of smoking
- C. Heparin therapy
- D. Topical antibiotic therapy
- E. Frequent position changes (Correct Answer)
Surgical wound classification Explanation: ***Frequent position changes***
- This patient is paraplegic, which increases his risk for **pressure ulcers** due to prolonged immobility and sustained pressure on bony prominences like the calcaneum.
- **Frequent repositioning** redistributes pressure, preventing skin breakdown and promoting circulation, thereby avoiding pressure injuries.
*Broad-spectrum antibiotic therapy*
- The wound is described as a **partial-thickness loss** with a pink wound bed, suggesting it's not primarily an infected wound requiring broad-spectrum antibiotics to prevent its formation.
- Antibiotics are used to **treat existing infections**, not prevent pressure ulcers in a non-infected state.
*Cessation of smoking*
- While **smoking impairs wound healing** and overall vascular health, it is not the most direct or primary preventative measure for a pressure ulcer caused by immobility.
- Smoking cessation would improve **long-term vascular health** and *ulcer healing*, but frequent position changes addresses the immediate cause of pressure.
*Heparin therapy*
- **Heparin** is an anticoagulant used to prevent **thrombosis** (blood clots), which is not the primary mechanism behind pressure ulcer formation.
- While immobility can contribute to deep vein thrombosis, heparin would not prevent the **mechanical pressure-induced skin damage** that causes a calcaneal wound.
*Topical antibiotic therapy*
- Similar to systemic antibiotics, topical antibiotics are used for **treating localized infections** or preventing them in *open wounds*.
- This wound is a result of pressure, and preventing its formation requires addressing the pressure itself, not merely applying antibiotics to the skin surface.
Surgical wound classification US Medical PG Question 10: A 63-year-old man comes to the emergency department because of pain in his left groin for the past hour. The pain began soon after he returned from a walk. He describes it as 8 out of 10 in intensity and vomited once on the way to the hospital. He has had a swelling of the left groin for the past 2 months. He has chronic obstructive pulmonary disease and hypertension. Current medications include amlodipine, albuterol inhaler, and a salmeterol-fluticasone inhaler. He appears uncomfortable. His temperature is 37.4°C (99.3°F), pulse is 101/min, and blood pressure is 126/84 mm Hg. Examination shows a tender bulge on the left side above the inguinal ligament that extends into the left scrotum; lying down or applying external force does not reduce the swelling. Coughing does not make the swelling bulge further. There is no erythema. The abdomen is distended. Bowel sounds are hyperactive. Scattered rhonchi are heard throughout both lung fields. Which of the following is the most appropriate next step in management?
- A. Laparoscopic surgical repair
- B. Surgical drainage
- C. Antibiotic therapy
- D. Open surgical repair (Correct Answer)
- E. Surgical exploration of the testicle
Surgical wound classification Explanation: ***Open surgical repair***
- The patient presents with a **painful, non-reducible inguinal hernia** that has likely **incarcerated** or **strangulated**, given the acute onset of severe pain, vomiting, and abdominal distension with hyperactive bowel sounds.
- In cases of suspected incarceration or strangulation, **urgent open surgical repair** is indicated to prevent **bowel ischemia** and its serious complications (e.g., perforation, sepsis).
*Laparoscopic surgical repair*
- While laparoscopic repair is an option for elective hernia repair, it is generally **contraindicated** in cases of **incarcerated or strangulated hernias** due to the higher risk of bowel injury, inadequate assessment of bowel viability, and longer operative times in an emergency setting.
- Also, the patient's **COPD** might make him a less ideal candidate for laparoscopy due to the risks associated with pneumoperitoneum.
*Surgical drainage*
- Surgical drainage is typically performed for abscesses or fluid collections, which are **not the primary issue** in this presentation.
- A hernia involves displacement of organs, not an accumulation of fluid or pus requiring drainage.
*Antibiotic therapy*
- Although antibiotics might be considered as an adjunctive therapy if infection is suspected or confirmed (e.g., with bowel necrosis), they are **not the definitive primary treatment** for an incarcerated or strangulated hernia.
- The mechanical obstruction and potential ischemia require surgical intervention for resolution.
*Surgical exploration of the testicle*
- While the bulge extends into the scrotum, the primary concern is the **incarcerated hernia** itself.
- Surgical exploration of the testicle would be indicated for conditions like testicular torsion, epididymitis, or testicular masses, which are not suggested by the presented symptoms.
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