Reconstruction Principles in Head and Neck — MCQs
High velocity gunshot injury with periosteal denudation & comminuted fracture is best treated as
What type of graft or dressing is used to cover the post-burn wound shown in the image?
In periodontal surgical treatment, which of the following surgical procedures are typically carried out first:
During reconstruction of an amputated limb which of the following is done first?
Which of the following is not a relative contraindication for breast conservative surgery?
Deep skin burns are treated with:
What are the characteristics of reversible pulpitis?
In hand injury, the first structure to be repaired should be?
Which flap is commonly used in breast reconstruction?
Burns involving the head and neck region are particularly dangerous because :
Reconstruction Principles in Head and Neck Indian Medical PG Practice Questions and MCQs
Question 1: High velocity gunshot injury with periosteal denudation & comminuted fracture is best treated as
- A. Immediate reconstruction & grafting
- B. 'Bag of bones' & IMF
- C. Reconstruction plates & closure of fracture
- D. Initially debridement is done, then load bearing reconstruction plates, and grafting in secondary procedure (Correct Answer)
Explanation: ***Initially debridement is done, then load bearing reconstruction plates, and grafting in secondary procedure*** - **High-velocity gunshot wounds** often cause extensive tissue damage, periosteal stripping, and comminuted fractures, which necessitate thorough **debridement** of devitalized tissue and foreign bodies to prevent infection. - Due to the nature of the injury, a **staged approach** is preferred: initial debridement to achieve a clean wound,followed by **load-bearing reconstruction plates** for stability, and then delayed **grafting** if necessary, once the infection risk is minimized and soft tissue coverage is achieved. *Immediate reconstruction & grafting* - Performing immediate reconstruction and grafting in a **dirty, high-energy trauma wound** carries an extremely high risk of **infection** and graft failure. - The extent of tissue damage and contamination from a gunshot wound makes immediate closure and grafting unwise without prior debridement. *'Bag of bones' & IMF* - While **intermaxillary fixation (IMF)** ("bag of bones" technique) can be used for certain mandibular fractures, it does not provide sufficient stability for complex, comminuted fractures with significant bone loss and periosteal denudation caused by a high-velocity gunshot wound . - The "bag of bones" approach mainly applies to facial trauma with multiple bone fragments and often requires subsequent reconstruction, but it is not the primary treatment for these type of fractures immediately. *Reconstruction plates & closure of fracture* - Simply closing the fracture with reconstruction plates without initial **debridement** is inappropriate for a high-velocity gunshot wound as it traps contaminated and devitalized tissue, leading to a high risk of **osteomyelitis** and non-union. - This approach fails to address the underlying tissue damage and potential for infection, which are critical considerations for such injuries.
Question 2: What type of graft or dressing is used to cover the post-burn wound shown in the image?
- A. Split thickness skin graft (Correct Answer)
- B. Full thickness skin graft
- C. VAC dressing
- D. Normal saline dressing
Explanation: ***Split thickness skin graft*** - The image shows a **meshed pattern** on the skin graft, which is characteristic of a **split-thickness skin graft** that has been expanded to cover a larger area. - This type of graft consists of the epidermis and a portion of the dermis, making it more flexible and able to **"take" more reliably** on various wound beds, commonly used for burn wounds. *Full thickness skin graft* - A **full-thickness skin graft** includes the entire epidermis and dermis and typically does not have a meshed appearance. - They are used for smaller defects where cosmesis is a priority, but have a **lower take rate** than split-thickness grafts, making them less suitable for large burn wounds. *VAC dressing* - A **VAC (Vacuum-Assisted Closure) dressing** is a system that applies negative pressure to a wound to promote healing and is not a skin graft itself. - It involves a foam or gauze dressing sealed with an adhesive film, connected to a vacuum pump, which is not what is depicted in the image. *Normal saline dressing* - A **normal saline dressing** is a simple wet-to-dry or wet-to-wet dressing for wound care, involving gauze soaked in normal saline. - This is a basic wound management technique and does not involve grafting or have the characteristic meshed appearance seen in the image.
Question 3: In periodontal surgical treatment, which of the following surgical procedures are typically carried out first:
- A. Gingivectomy
- B. Flap surgery (Correct Answer)
- C. Osseous recontouring
- D. Mucogingival surgery
Explanation: ***Flap surgery*** - **Flap surgery**, also known as **open flap debridement**, is a foundational procedure in periodontal treatment to gain access to the **root surfaces** and **bone defects**. - It involves lifting the **gingival tissue** to thoroughly clean and debride the affected areas, and is often the initial surgical approach once **non-surgical therapies** have been exhausted. *Gingivectomy* - **Gingivectomy** is primarily used for the removal of **excess gingival tissue** (gingival enlargement) or for **cosmetic recontouring**. - It is typically performed when there is no **osseous defect** or when access to the bone is not required, making it less suitable as the initial general surgical step for deeper periodontal disease. *Osseous recontouring* - **Osseous recontouring** (osteoplasty/ostectomy) involves reshaping or removing **bone defects** and is usually performed *after* **flap elevation** to correct underlying bony architecture. - It is a more advanced step once the **gingiva has been reflected** and the bone can be directly visualized and accessed. *Mucogingival surgery* - **Mucogingival surgery** addresses issues like **gingival recession**, inadequate **attached gingiva**, or abnormal **frena**. - These procedures (e.g., **gum grafting**) are often performed *after* initial periodontal disease control or when specific mucogingival defects require correction, rather than as a primary approach for pocket reduction.
Question 4: During reconstruction of an amputated limb which of the following is done first?
- A. Arterial repair
- B. Venous repair
- C. Fixation of the bone (Correct Answer)
- D. Nerve anastomoses
Explanation: ***Fixation of the bone*** - **Bone stabilization** is the crucial first step to create a rigid framework, allowing for subsequent precise vascular and nerve repairs. - This prevents movement and tension on delicate repairs, which could lead to failure of the reconnected vessels and nerves. *Arterial repair* - While critical for blood supply, arterial repair is performed *after* bone fixation to ensure the vessels are not disrupted by later bone manipulation. - It's typically done before venous repair to establish arterial flow and identify any potential venous back pressure that needs addressing. *Venous repair* - Venous repair is usually performed after arterial repair, as establishing arterial inflow can help distend the veins, making them easier to identify and repair. - Repairing veins first without establishing arterial flow immediately is less effective and may lead to congestion once arterial flow is restored. *Nerve anastomoses* - Nerve repair is typically the last major step in an amputation reconstruction, following bone stabilization and full vascular repair. - Nerves are fragile and require a stable, well-perfused environment to optimize the chances of successful regeneration.
Question 5: Which of the following is not a relative contraindication for breast conservative surgery?
- A. Multicentric disease
- B. Previous radiation to breast
- C. Large tumor size
- D. Small tumor size (<3cm) (Correct Answer)
Explanation: ***Small tumor size (<3cm)*** ✓ - A small tumor size is **NOT a contraindication** for breast-conserving surgery; it is actually a **favorable condition** and an indication for breast conservation. - Small tumors allow for complete tumor removal with good cosmetic outcomes and adequate margins. - This is the **correct answer** as it is the only option that is NOT a relative contraindication. *Multicentric disease* - **Multicentric disease** refers to the presence of multiple tumor foci in **different quadrants** of the breast, making complete surgical removal challenging with breast-conserving surgery. - This is a **relative contraindication** as it increases the risk of **positive margins** and local recurrence, making mastectomy often a more appropriate option. *Previous radiation to breast* - Prior radiation therapy to the breast is a **contraindication** (often considered absolute) for subsequent breast radiation, which is an essential component of breast-conserving therapy. - Re-irradiation carries a high risk of severe **skin and tissue toxicity**, making further breast conservation unfeasible. *Large tumor size* - A large tumor size is a **relative contraindication** as it can make it difficult to achieve **clear surgical margins** while maintaining an acceptable cosmetic result. - However, **neoadjuvant chemotherapy** may downstage large tumors to make them suitable for breast-conserving surgery. - Without tumor reduction, it often requires **mastectomy**.
Question 6: Deep skin burns are treated with:
- A. Amniotic membrane
- B. Split thickness graft (Correct Answer)
- C. Full thickness graft
- D. Synthetic skin derivatives
Explanation: ***Split thickness graft*** - A **split-thickness skin graft (STSG)** involves transferring the epidermis and a portion of the dermis from a donor site to the burned area. - This type of graft is commonly used for deep partial-thickness or full-thickness burns because it provides good coverage with minimal donor site morbidity and has a high take rate. *Amniotic membrane* - **Amniotic membrane** is primarily used as a biological dressing for superficial burns or chronic wounds, promoting healing and reducing pain. - It does not provide permanent skin coverage for deep burns, which require viable skin for closure. *Full thickness graft* - A **full-thickness skin graft (FTSG)** includes the entire epidermis and dermis, resulting in better cosmetic and functional outcomes. - However, FTSGs are typically used for smaller, deeper defects or areas requiring maximum durability, rather than extensive deep burns, and their take rate is lower compared to STSGs. *Synthetic skin derivatives* - **Synthetic skin derivatives** (e.g., Integra, Biobrane) can be used as temporary dressings or matrices to facilitate wound healing in deep burns, but they typically require subsequent grafting. - They do not provide permanent, living tissue for definitive closure of large, deep burn wounds.
Question 7: What are the characteristics of reversible pulpitis?
- A. Aggravated by heat and may be relieved by cold
- B. Aggravated by cold and may be relieved by heat
- C. No reaction to hot and cold, indicating necrosis
- D. Reacts to electric pulp tester (Correct Answer)
Explanation: ***Reacts to electric pulp tester*** - In **reversible pulpitis**, the pulp is still vital and responsive, thus it will react to an **electric pulp tester** (EPT) with a sharp, transient pain at a lower current. - The sensation elicited by EPT indicates the presence of nerve fibers and a viable pulp, consistent with a reversible condition. *Aggravated by heat and may be relieved by cold* - This symptom profile, where pain is **aggravated by heat** and **relieved by cold**, is characteristic of **irreversible pulpitis**, not reversible pulpitis. - The relief with cold often indicates a build-up of pressure within the pulp that is temporarily alleviated by the vasoconstrictive effect of cold. *Aggravated by cold and may be relieved by heat* - While some mild, transient cold sensitivity can occur in **reversible pulpitis**, severe or prolonged cold sensitivity is more indicative of irreversible pulpitis. Relief with heat is not a typical characteristic of reversible pulpitis and would be very unusual for any pulpitis. - This pattern of discomfort is not a direct characteristic of reversible pulpitis; reversible pulpitis typically presents with **sharp, transient pain to cold** that resolves quickly. *No reaction to hot and cold, indicating necrosis* - A lack of reaction to thermal stimuli (hot and cold) is indicative of a **necrotic pulp**, meaning the pulp tissue has died. - In **reversible pulpitis**, the pulp is inflamed but still vital, and therefore will react to thermal stimuli, usually with a sharp, transient pain to cold.
Question 8: In hand injury, the first structure to be repaired should be?
- A. Skin
- B. Muscle
- C. Nerve
- D. Bone (Correct Answer)
Explanation: ***Bone*** - In hand injury, **skeletal stability** is paramount and is typically the first structure to be addressed to provide a stable foundation. - Repairing bone first allows for proper alignment and length restoration, which is crucial for the subsequent repair of soft tissues like tendons, nerves, and vessels. *Skin* - While skin closure is the final step in wound management, it should only be performed after deeper structures like bone, tendons, and nerves have been repaired. - Repairing the skin first would prevent access to underlying damaged structures and could lead to functional impairment. *Muscle* - Muscle repair is important for restoring function but should follow bone stabilization to ensure proper length and tension. - Unstable bone fragments can impede effective muscle repair and healing. *Nerve* - Nerve repair is critical for restoring sensation and motor function and should be done with meticulous attention to detail. - However, nerve repair typically follows bone stabilization and sometimes tendon repair, as a stable environment is necessary for successful nerve coaptation and healing.
Question 9: Which flap is commonly used in breast reconstruction?
- A. DIEP based on deep inferior epigastric perforator vessels (Correct Answer)
- B. Gluteal flap based on superior gluteal artery
- C. Latissimus dorsi flap based on thoracodorsal artery
- D. TRAM based on transverse rectus abdominis muscle
Explanation: ***DIEP based on deep inferior epigastric perforator vessels*** - The **DIEP flap** is currently the **most preferred autologous flap** for breast reconstruction and is increasingly commonly used in modern practice. - It uses tissue from the lower abdomen, providing excellent volume and a natural-feeling breast mound, while being nourished by **deep inferior epigastric perforator vessels**. - Key advantage: **Muscle-sparing technique** that preserves the rectus abdominis muscle, minimizing abdominal wall morbidity compared to older techniques like TRAM. - Considered the **gold standard** for abdominal-based breast reconstruction. *Gluteal flap based on superior gluteal artery* - While gluteal flaps (like the **SGAP** based on the **superior gluteal artery**) are used for breast reconstruction, they are typically considered a secondary option when abdominal tissue is unavailable or unsuitable. - Harvesting can be more challenging and may result in a less ideal breast shape compared to abdominal flaps. - Less commonly used compared to abdominal-based flaps. *Latissimus dorsi flap based on thoracodorsal artery* - The **latissimus dorsi flap** is a reliable and commonly used option, particularly for smaller breasts or partial reconstruction. - However, it often requires an implant to achieve sufficient volume (not purely autologous reconstruction). - It involves transferring muscle from the back, which can lead to back weakness or contour deformities. - While frequently used, it is not the preferred choice when autologous tissue from the abdomen is available. *TRAM based on transverse rectus abdominis muscle* - The **TRAM flap** was historically a very common choice for breast reconstruction but involves taking a significant portion of the rectus abdominis muscle. - This leads to higher rates of abdominal wall weakness, hernias, or bulges compared to muscle-sparing techniques. - It is currently **less commonly used** than the DIEP flap due to its higher donor site morbidity and has been largely superseded by the DIEP technique.
Question 10: Burns involving the head and neck region are particularly dangerous because :
- A. Face is a very vascular area
- B. Renal failure is more frequent
- C. Blood loss may be more severe
- D. There may be thermal damage to the respiratory passage (Correct Answer)
Explanation: ***There may be thermal damage to the respiratory passage*** - Burns to the **head and neck** often indicate exposure to heat or flame around the face, increasing the risk of inhaling hot air, smoke, or toxic fumes. - This can lead to **thermal damage** to the upper and lower **respiratory passages**, causing edema, airway obstruction, and acute respiratory distress. *Face is a very vascular area* - While the face is indeed **vascular**, this property primarily impacts **healing time** (often faster due to good blood supply) and the potential for swelling, but does not inherently make burns in this region "particularly dangerous" in the immediate, life-threatening sense compared to airway compromise. - The vascularity itself doesn't directly cause a unique danger that surpasses the risk of **airway obstruction** or systemic complications. *Renal failure is more frequent* - **Acute renal failure** can be a complication of severe burns due to hypovolemia, rhabdomyolysis, or sepsis, but it is not specific to burns of the head and neck region. - It is a systemic complication related to the overall burn severity and total body surface area (TBSA) involved, rather than the specific anatomical location of the burn. *Blood loss may be more severe* - Significant **blood loss** is not typically a direct primary concern in burn injuries unless there are associated trauma or very deep burns to highly vascular areas. - While fluid shifts in burns can be massive, initial blood loss is not the defining factor that makes head and neck burns particularly dangerous from a life-threatening perspective.
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