Minimally Invasive Surgery — MCQs

Minimally Invasive Surgery Indian Medical PG Practice Questions and MCQs

Question 41: Which of the following is NOT a CONTRAINDICATION for laparoscopic surgery:

A. Severe COPD
B. Bowel herniation
C. Endometriosis (Correct Answer)
D. Severe cardiac compromise

Explanation: ***Endometriosis*** - **Endometriosis** is a *common indication* for laparoscopic surgery, as laparoscopy allows for both diagnosis and treatment (e.g., excision or ablation of endometrial implants). - It is *not* a contraindication; in fact, laparoscopy is the **gold standard** for diagnosing and managing endometriosis due to its minimally invasive nature and excellent visualization. *Severe COPD* - **Severe COPD** is a significant *contraindication* because pneumoperitoneum increases intra-thoracic pressure and elevates the diaphragm, reducing functional residual capacity. - This can cause *hypercarbia*, *hypoxemia*, and respiratory compromise in patients with already limited pulmonary reserve, making general anesthesia and laparoscopy high-risk. *Bowel herniation* - **Incarcerated or strangulated bowel herniation** is generally a *relative contraindication* due to the risk of intestinal injury during trocar insertion or manipulation. - The presence of *adhesions* and compromised bowel can make laparoscopic access challenging, though experienced surgeons may still attempt laparoscopic repair in selected cases. *Severe cardiac compromise* - **Severe cardiac compromise** is a significant *contraindication* because pneumoperitoneum causes increased intra-thoracic pressure, reduced venous return, and increased systemic vascular resistance. - This can lead to decreased *cardiac output*, arrhythmias, and hemodynamic instability, posing substantial risk to patients with severe cardiovascular disease.

Question 42: Which of the following gases is commonly used in laparoscopic procedures?

A. N₂O
B. CO2 (Correct Answer)
C. Pure O2
D. Air

Explanation: ***CO2*** - **Carbon dioxide (CO2)** is commonly used for **insufflation** in laparoscopic procedures due to its **high solubility in blood**, which reduces the risk of gas embolism. - Its rapid absorption and exhalation by the lungs ensure quick elimination from the body, making it a safe choice. *N₂O* - **Nitrous oxide (N₂O)** is an oxidizing agent that supports combustion, making it unsuitable for use in surgical environments where electrosurgical devices are utilized. - While it has higher solubility than air, it has lower solubility than CO2, increasing the risk of gas embolism if used for insufflation. *Pure O2* - **Pure oxygen (O2)** is highly flammable and significantly increases the risk of fire in the operating room, especially with the use of electrocautery. - It also has a lower solubility in blood compared to CO2, which could increase the risk of gas embolism. *Air* - **Air** is primarily composed of nitrogen and oxygen. Using air for insufflation poses risks due to the presence of nitrogen, which has very low blood solubility. - Air has a lower solubility in blood than CO2, increasing the potential for complications like gas embolism and slower absorption.

Question 43: Shoulder pain post laparoscopy is due to:

A. Subphrenic abscess
B. CO2 retention (Correct Answer)
C. Compression of the lung
D. Positioning of the patient

Explanation: ***CO2 retention*** - Shoulder pain after laparoscopy is typically referred pain caused by **diaphragmatic irritation** due to residual **carbon dioxide (CO2)** gas used for insufflation. - The **phrenic nerve**, which innervates the diaphragm, shares sensory pathways with the shoulder, leading to referred pain. *Subphrenic abscess* - While a subphrenic abscess can cause diaphragmatic irritation and shoulder pain, it is a **delayed complication** and not an immediate cause of postoperative pain. - It would also be accompanied by signs of **infection** such as fever and leukocytosis, which are not implied here. *Compression of the lung* - **Lung compression** during laparoscopy can occur due to pneumoperitoneum but primarily causes respiratory symptoms and atelectasis, not typically shoulder pain. - Lung compression itself does not directly irritate the **diaphragm** in the same manner as CO2. *Positioning of the patient* - Poor patient positioning can cause musculoskeletal pain in the neck, back, or shoulders due to **nerve compression** or **muscle strain**. - However, the classic referred shoulder pain after laparoscopy is specifically attributed to **diaphragmatic irritation** from CO2, distinguishing it from general positioning discomfort.

Question 44: Among the following conditions, laparoscopy carries the highest risk in patients with:

A. COPD (Correct Answer)
B. Diabetes
C. Hypertension
D. Obesity

Explanation: ***COPD*** - **COPD** patients have severely compromised respiratory function, and the **pneumoperitoneum** from CO2 insufflation causes **diaphragmatic splinting** and reduced lung compliance, leading to dangerous **CO2 retention** and respiratory failure. - The increased **intra-abdominal pressure** significantly impairs ventilation in patients who already have limited respiratory reserve, making laparoscopy extremely high-risk. *Diabetes* - While diabetes increases risks of **poor wound healing** and **infection**, these complications are not specifically worse with laparoscopy compared to open surgery. - **Perioperative glucose management** can effectively control diabetes-related risks, and laparoscopy may actually offer benefits like smaller incisions. *Hypertension* - **Hypertension** requires careful **blood pressure monitoring** during surgery but doesn't pose risks unique to laparoscopic procedures. - Well-controlled hypertension with appropriate **antihypertensive medications** allows for safe laparoscopic surgery. *Obesity* - **Obesity** makes laparoscopy technically challenging due to **thick abdominal walls** and need for higher insufflation pressures. - However, laparoscopy is often **preferred over open surgery** in obese patients due to reduced wound complications and faster recovery.

Question 45: What are the specific advantages of laparoscopic inguinal hernia repair compared to open repair?

A. Easier to learn but may have slower patient rehabilitation.
B. Better mesh fixation with longer recovery time.
C. Quick recovery but requires advanced expertise.
D. Smaller incisions and reduced postoperative pain. (Correct Answer)

Explanation: ***Smaller incisions and reduced postoperative pain.*** - **Laparoscopic repair** involves several small incisions (typically 3-4 ports) rather than one large incision, leading to less tissue disruption. - This minimally invasive approach results in **significantly reduced postoperative pain** and faster recovery. - These are the **primary and most specific advantages** that distinguish laparoscopic from open repair. *Easier to learn but may have slower patient rehabilitation.* - **Incorrect**: Laparoscopic techniques are actually **more difficult to learn** compared to open repair, requiring advanced hand-eye coordination and spatial orientation. - Patient rehabilitation is typically **faster** with laparoscopic repair, not slower. *Better mesh fixation with longer recovery time.* - **Incorrect**: Mesh fixation quality is comparable between both techniques, not specifically better with laparoscopy. - Recovery time for laparoscopic repair is **shorter**, not longer, than open repair. *Quick recovery but requires advanced expertise.* - While both statements are true, this option presents a **mixed message** combining an advantage (quick recovery) with a requirement/limitation (advanced expertise needed). - "Requires advanced expertise" is a **barrier or prerequisite**, not an advantage of the technique itself. - The correct answer is more specific and focuses purely on the advantages without qualifiers.

Question 46: During a laparoscopic procedure, a patient develops shoulder pain. What is the most likely cause of this referred pain?

A. Positional pain during surgery
B. Injury to liver
C. Subphrenic abscess
D. Referred pain due to subdiaphragmatic migration of gas (Correct Answer)

Explanation: ***Referred pain due to subdiaphragmatic migration of gas*** - During **laparoscopic procedures**, carbon dioxide gas is insufflated into the abdominal cavity, which can irritate the **diaphragm**. - **Diaphragmatic irritation** stimulates the **phrenic nerve**, which shares nerve roots (C3-C5) with the **supraclavicular nerves**, leading to referred pain in the ipsilateral shoulder. *Subphrenic abscess* - While a **subphrenic abscess** can cause shoulder pain via diaphragmatic irritation, it is a complication that develops **postoperatively**, not during the procedure itself. - An abscess would also likely present with **fever**, **leukocytosis**, and other signs of infection, which are not mentioned here. *Positional pain during surgery* - **Positional pain** can occur during surgery due to prolonged positioning, but it is typically more generalized musculoskeletal discomfort and less specifically localized to the shoulder as referred pain from the diaphragm. - This type of pain often resolves with repositioning and is not directly related to the **CO2 insufflation** causing diaphragmatic irritation. *Injury to liver* - **Liver injury**, though a serious complication of laparoscopic surgery, would cause significant **abdominal pain** in the upper right quadrant, potentially radiating to the back. - It does not typically cause isolated, sharp **referred shoulder pain** in the same way diaphragmatic irritation does.

Question 47: What should be done if a bowel is punctured during laparoscopy?

A. Trocar kept (Correct Answer)
B. Trocar removal
C. Trocar repositioned
D. Continue laparoscopic procedure

Explanation: ***Trocar kept*** - Keeping the **trocar in place** after an iatrogenic bowel puncture is crucial to **minimize contamination** of the peritoneal cavity. - The trocar acts as a **plug**, preventing spillage of bowel contents while preparations are made for definitive repair, often via **laparotomy**. - This allows the surgical team to **identify the exact location** of injury and prepare for conversion to open surgery if needed. *Trocar removal* - Removing the trocar would allow potentially infected **bowel contents to spill** into the abdominal cavity, increasing the risk of **peritonitis** and sepsis. - This action could also make it more difficult to **locate the injury** for subsequent repair. *Trocar repositioned* - **Repositioning** the trocar would disturb the puncture site and could potentially enlarge the injury or cause further **spillage of bowel contents**. - The primary goal is to **contain the contamination**, not to move the instrument. *Continue laparoscopic procedure* - Continuing the procedure without addressing the bowel injury would lead to **continued contamination** of the peritoneal cavity and potential catastrophic sepsis. - Bowel perforation is a **surgical emergency** requiring immediate attention and usually **conversion to laparotomy** for proper repair.

Question 48: Best gas used for creating pneumoperitoneum at laparoscopy is:

A. N2
B. CO2 (Correct Answer)
C. N2O
D. O2

Explanation: ***CO2*** - **Carbon dioxide** is rapidly absorbed and expelled by the respiratory system, minimizing the risk of **gas embolism**. - It is **non-flammable**, which is crucial in a surgical environment where electrosurgical devices are often used. - CO2 is **highly soluble in blood**, allowing rapid clearance if venous absorption occurs. *N2* - **Nitrogen** is not ideal for pneumoperitoneum as its poor solubility in blood leads to a significant risk of **gas embolism**. - **Increased nitrogen pockets** can create complications that make it a poor choice. *O2* - **Oxygen** poses a significant **fire hazard** in the presence of electrosurgical instruments. - It **supports combustion**, making the surgical field dangerous when using electrocautery or laser devices. *N2O* - **Nitrous oxide** supports **combustion**, making it unsafe for use with electrosurgical devices. - It can also diffuse into **bowel loops**, causing distension and obstructing visibility, which is undesirable during laparoscopy.

Question 49: What is a key advantage of fiberoptic bronchoscopy compared to rigid bronchoscopy?

A. Preferred for foreign body removal
B. Provides superior visualization of airways (Correct Answer)
C. Offers better stability during procedures
D. Provides better control for massive hemoptysis

Explanation: ***Provides superior visualization of airways*** - Fiberoptic bronchoscopy uses a **flexible scope** with a built-in camera, allowing access and visualization of **smaller, more peripheral airways** (segmental and subsegmental bronchi) that rigid bronchoscopes cannot reach. - This enhanced maneuverability provides a much **broader field of view** and greater diagnostic capabilities for subtle lesions in the distal airways. *Preferred for foreign body removal* - **Rigid bronchoscopy** is generally preferred for foreign body removal, especially in children, due to its **larger working channel** and ability to provide a more stable and direct path for retrieval instruments. - While fiberoptic scopes can remove small, superficial foreign bodies, they lack the **force and suction** needed for larger or impacted objects. *Provides better control for massive hemoptysis* - **Rigid bronchoscopy** is superior for managing **massive hemoptysis** due to its larger lumen allowing better ventilation, superior suction capabilities, and ability to tamponade bleeding sites. - The rigid scope provides a stable platform for therapeutic interventions like **laser therapy, cryotherapy, or balloon tamponade** that require precise control. *Offers better stability during procedures* - **Rigid bronchoscopy** offers **superior stability** and a larger, unobstructed working channel, which is crucial for procedures requiring significant manipulation, such as **tumor debulking** or **stent placement**. - Its rigid structure provides a stable platform for instruments, whereas a flexible scope can be more prone to movement and offers less robust therapeutic capabilities.

Question 50: The technique of laparoscopic cholecystectomy was first performed by whom?

A. Erich Muhe (Correct Answer)
B. Eddie Joe Reddick
C. Philippe Mouret
D. Kurt Semm

Explanation: ***Erich Muhe*** - **Erich Muhe**, a German surgeon, performed the first laparoscopic cholecystectomy on September 12, 1985. - He is widely credited with pioneering this minimally invasive surgical technique for gallbladder removal. - This groundbreaking procedure marked the beginning of the laparoscopic revolution in surgery. *Philippe Mouret* - **Philippe Mouret** performed laparoscopic cholecystectomy in France in 1987, independently developing the technique. - While significant in advancing the procedure in Europe, his work followed Muhe's initial breakthrough. *Eddie Joe Reddick* - **Eddie Joe Reddick** was an American surgeon who, along with Douglas Olsen, was instrumental in popularizing and standardizing laparoscopic cholecystectomy in the United States in the late 1980s. - While not the first to perform the procedure, he played a crucial role in its widespread adoption and refinement. - His contributions were significant but came after Muhe's pioneering work. *Kurt Semm* - **Kurt Semm** was a German gynecologist who significantly advanced laparoscopic surgery in the 1980s, particularly in gynecology. - He developed many laparoscopic instruments and techniques, including the automatic insufflator. - Although a pioneer in laparoscopy, he did not perform the first laparoscopic cholecystectomy.

Practice by Chapter

Laparoscopic Equipment and Instrumentation

Practice Questions

Physiological Changes in Laparoscopy

Practice Questions

Laparoscopic Access Techniques

Practice Questions

Laparoscopic Cholecystectomy

Practice Questions

Laparoscopic Appendectomy

Practice Questions

Laparoscopic Hernia Repair

Practice Questions

Laparoscopic Colorectal Surgery

Practice Questions

Laparoscopic Upper GI Surgery

Practice Questions

Robotic Surgery

Practice Questions

Single Incision Laparoscopic Surgery

Practice Questions

NOTES (Natural Orifice Transluminal Endoscopic Surgery)

Practice Questions

Complications of Minimally Invasive Surgery

Practice Questions

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