Minimally Invasive Surgery Practice Questions

Q: A mill-wheel type of murmur heard during laparoscopy suggests which of the following complications?

Gas embolism. **Explanation:** The correct answer is **Gas Embolism (Option C)**. **Mechanism:** A gas embolism (usually CO₂) is a rare but life-threatening complication of laparoscopy. It occurs when gas is inadvertently insufflated into a high-pressure venous channel or an injured vessel. Once the gas enters the right side of the heart, it mixes with blood to form a "frothy" air-lock in the right ventricle, obstructing pulmonary outflow. The characteristic **"mill-wheel" murmur** is a loud, churning, splashing sound heard over the precordium caused by this air-blood mixture. **Analysis of Incorrect Options:** * **A. Tension pneumothorax:** While it can occur during laparoscopy (due to diaphragmatic injury), it presents with absent breath sounds, tracheal shift, and hemodynamic collapse, not a mill-wheel murmur. * **B. Intra-abdominal bleeding:** This leads to hemorrhagic shock (tachycardia, hypotension) and potentially abdominal distension, but does not produce specific cardiac murmurs. * **D. Pre-existing valvular disease:** While valvular issues cause murmurs (e.g., stenotic or regurgitant), they are typically present from the start of the procedure and do not produce the sudden, splashing "mill-wheel" sound associated with acute gas entry. **High-Yield Clinical Pearls for NEET-PG:** * **Early Sign:** The earliest sign of gas embolism is often a sudden **drop in End-Tidal CO₂ (ETCO₂)** due to increased physiological dead space. * **Management (Durant’s Maneuver):** Immediately stop insufflation, release pneumoperitoneum, and place the patient in the **Left Lateral Decubitus and Trendelenburg position**. This helps the gas bubble migrate toward the apex of the right ventricle, away from the pulmonary artery outflow tract. * **Gold Standard Diagnosis:** Transesophageal Echocardiography (TEE) is the most sensitive method for detection.

Q: Which instrument is primarily used to establish pneumoperitoneum in closed laparoscopy technique?

Veress needle. ***Veress needle***- It is primarily used to establish **pneumoperitoneum** (gas insufflation) in the **closed laparoscopy** technique, before placing trocars.- A key feature is its **blunt inner retractable stylet**. Once the needle passes the abdominal wall and enters the peritoneal cavity, the stylet advances forward automatically, reducing the risk of internal visceral injury.*Hasson's cannula*- This instrument is specifically designed for the **open laparoscopic technique** (Hasson technique), utilized when the closed technique is contraindicated due to scar tissue or risk of injury.- It involves a direct cut-down approach and fixation by sutures, making it a **blunt entry system** unlike the sharp, blind insertion of the Veress needle.*Jamshidi needle*- This is a specialized needle used for **bone marrow aspiration** or **biopsy**, typically used in hematology or oncology.- It is characterized by a **tapered distal end** with a sharpened tip and a stylet designed to penetrate dense bone tissue, which is unrelated to abdominal gas insufflation.*3 mm Trocar*- A trocar system consists of a **cannula and an obturator** and is used to create a working port for the introduction of the camera or surgical instruments, usually *after* pneumoperitoneum has been achieved.- While 3 mm is a small diameter, its function is creating an instrument channel, not the initial **insufflation** itself.

Q: Which of the following about Minimal Access Surgery are correct? I. Decreased intraoperative heat loss II. Improved visualization III. Increased chances of herniation IV. Improved mobility Select the answer using the code given below :

I, II and IV. ***I, II and IV (Correct Answer)*** **Statement I - Decreased intraoperative heat loss:** Correct. MAS involves smaller incisions with reduced exposure of internal organs to the operating room environment, resulting in significantly less heat loss compared to open surgery. **Statement II - Improved visualization:** Correct. Endoscopic cameras provide magnified, high-definition, and well-illuminated views of the surgical field, offering superior visualization compared to the naked eye in open procedures. **Statement IV - Improved mobility:** Correct. Patients experience faster post-operative recovery with less pain and earlier return to normal activities due to minimal tissue trauma from smaller incisions. **Statement III - Increased chances of herniation:** This statement is **INCORRECT** and is the key reason why options containing it are wrong. MAS typically results in *decreased* risk of incisional hernias due to smaller access points. While trocar-site hernias can occur, they are less common than the large incisional hernias seen in open surgery when proper fascial closure techniques are employed. *I, III and IV* - Incorrect because Statement III (increased herniation) is false. MAS reduces, not increases, herniation risk. *I, II and III* - Incorrect because Statement III (increased herniation) is false. Properly performed MAS has lower incisional hernia rates than open surgery. *II, III and IV* - Incorrect because Statement III (increased herniation) is false. Smaller incisions in MAS lead to reduced hernia formation compared to traditional open approaches.

Q: ‘Swiss cheese defects’ of anterior abdominal wall after exploratory laparotomy is best seen while doing:

Laparoscopic ventral hernia repair. ***Laparoscopic ventral hernia repair*** - During **laparoscopic ventral hernia repair**, the surgeon has an **intra-abdominal view** of the anterior abdominal wall. - This allows for direct visualization of multiple, small fascial defects ("Swiss cheese defects") from an old laparotomy incision from the inside. - The **panoramic view** from within the peritoneal cavity enables comprehensive assessment of the entire abdominal wall, making it the best approach to identify scattered defects. *Open inguinal hernia repair* - This approach focuses on the **inguinal canal** and does not provide an adequate view of the entire anterior abdominal wall. - It is performed through an **external incision**, making it difficult to detect multiple small defects throughout the rectus sheath. *Open ventral hernia repair* - While an **open ventral hernia repair** addresses a defect in the anterior abdominal wall, the exposure is typically confined to the immediate area of the hernia. - It may not offer the comprehensive intra-abdominal view necessary to identify scattered "Swiss cheese defects" across a wider area of the fascia. *Laparoscopic inguinal hernia repair* - This procedure primarily involves repairing an **inguinal hernia**, with visualization focused on the inguinal region and the posterior aspect of the groin. - It does not provide the broad intra-abdominal perspective needed to assess for general anterior abdominal wall defects or "Swiss cheese defects" away from the repair site.

Q: The Chief of laparoscopic surgery asked his assistant to give him a laparoscopic port which has absolutely no chance of "capacitance coupling" during laparoscopic surgery. Which port should the assistant give to the Chief?

Complete plastic port. **Complete plastic port** - A **complete plastic port** is an **electrical insulator** and thus completely prevents the phenomenon of **capacitance coupling** during laparoscopic surgery. - This is the safest option when electrosurgery is used, as it eliminates the risk of inadvertent energy transfer to surrounding tissues through the trocar. *Metal port with plastic cuff* - While a plastic cuff might offer some insulation, the presence of a **metal outer cannula** still allows for the possibility of charge accumulation and subsequent **capacitance coupling**. - The plastic cuff alone is insufficient to prevent the capacitance effect from the metal shaft, as the internal metal may still induce a charge on nearby conductive objects. *Metal laparoscopic port* - A **metal laparoscopic port** is a **conductor** and is highly susceptible to **capacitance coupling**, transferring stray electrical currents to unintended tissues. - The direct contact of conductive metal with the abdominal wall can create a pathway for current leakage, increasing the risk of **thermal injury**. *Partial plastic port* - Similar to a metal port with a plastic cuff, a **partial plastic port** would still have exposed metal components that can accumulate charge and lead to **capacitance coupling**. - Any exposed metal section can act as an electrode, enabling the unintentional delivery of electrical energy to non-target tissues.

Q: “Triangle of Doom” dissected and seen during Laparoscopic inguinal hernia repair is bounded by all EXCEPT:

Peritoneal fold. ***Peritoneal fold*** - The "Triangle of Doom" is an important anatomical landmark in **laparoscopic inguinal hernia repair** that contains critical vascular structures vulnerable to injury. - The **peritoneal fold** does not form a boundary of the Triangle of Doom, making this the correct answer to the EXCEPT question. - The triangle lies in the preperitoneal space and is not bounded by peritoneal reflections. *Vas deferens* - The **vas deferens** forms the **medial boundary** of the Triangle of Doom. - It courses from the internal ring into the pelvis and is a crucial landmark during dissection. - Injury can result in **infertility**, particularly if bilateral damage occurs. *Gonadal vessels* - The **gonadal vessels (testicular/ovarian vessels)** form the **lateral boundary** of the Triangle of Doom. - These vessels run parallel to the vas deferens and are at risk during lateral dissection. - The triangle's base is formed by the **iliac vessels** (external iliac artery and vein). *Cord structures* - The **cord structures** (including vas deferens and gonadal vessels) pass through or form the boundaries of the Triangle of Doom. - Within this triangle lie the **external iliac artery and vein** and the **femoral branch of the genitofemoral nerve**. - **Clinical significance**: Inadvertent stapling or dissection in this area can cause life-threatening **vascular injury** or nerve damage. **Note**: This should not be confused with the "Triangle of Pain" which is bounded laterally by the **inferior epigastric artery** and contains the lateral femoral cutaneous nerve and femoral branch of genitofemoral nerve.

Q: Which one of the following is the safest gas for creating pneumoperitoneum in operative laparoscopy?

Carbon dioxide. ***Carbon dioxide*** - **Carbon dioxide (CO2)** is the gold standard for creating **pneumoperitoneum** because it is rapidly absorbed from the **peritoneal cavity** and excreted by the lungs, minimizing the risk of gas embolism. - Its **high solubility in blood** (20x more soluble than nitrogen) reduces the risk of serious complications if inadvertently injected intravascularly. - **Non-combustible** and does not support combustion, making it safe to use with electrocautery and other heat sources during surgery. *Oxygen* - **Oxygen** is highly **combustible** and would create a significant fire hazard in the presence of electrocautery or other heat sources during surgery. - It could also cause **gas emboli** if it enters the bloodstream, as it is less soluble than CO2. - Risk of **oxidative tissue damage** with prolonged exposure. *Carbon monoxide* - **Carbon monoxide** is extremely **toxic** and binds irreversibly to hemoglobin with 200-250 times greater affinity than oxygen, forming **carboxyhemoglobin**, which impairs oxygen transport. - Even minimal exposure can be life-threatening due to systemic hypoxia. - Absolutely contraindicated for clinical use. *Nitrous oxide* - **Nitrous oxide** can diffuse into gas-filled spaces (bowel loops) 30x faster than nitrogen, potentially causing **bowel distension** and increased intra-abdominal pressure during prolonged procedures. - Although less of a fire risk than oxygen, it can **support combustion** at high concentrations. - Less rapidly absorbed than CO2, posing higher embolism risk if intravascular injection occurs.

Q: Consider the following statements: 1. Carbon dioxide is the safest gas for creating pneumoperitoneum in operative laparoscopy. 2. Laparoscopic sterilization is not recommended during the period of immediate postpartum. Which of the statements given above is/are correct?

Both 1 and 2. ***Both 1 and 2*** - **Carbon dioxide (CO2)** is the safest gas for creating pneumoperitoneum due to its **rapid absorption** and **excretion** by the body, minimizing the risk of gas embolism and tissue toxicity. - Laparoscopic sterilization is generally **not recommended during the immediate postpartum period** (first 6-8 weeks) due to the **enlarged uterus**, increased vascularity, and altered anatomy, which elevate the risk of complications such as hemorrhage and organ perforation. *1 only* - While carbon dioxide is indeed the safest gas for pneumoperitoneum, this option is incorrect because the second statement regarding postpartum sterilization is also accurate. - Selecting this option would imply that statement 2 is false, which is not the case. *Neither 1 nor 2* - This option is incorrect because both statements are clinically accurate and accepted practices in operative laparoscopy and postpartum care. - Both statements reflect standard surgical and obstetric guidelines. *2 only* - This option is incorrect because, in addition to the second statement being true, the first statement (regarding the safety of CO2 for pneumoperitoneum) is also correct. - Choosing this option would suggest that CO2 is not the safest gas, which contradicts established medical practice.

Question 1

A mill-wheel type of murmur heard during laparoscopy suggests which of the following complications?

Accepted Answer

Gas embolism

Answer

Tension pneumothorax

Answer

Intra-abdominal bleeding

Answer

Pre-existing valvular disease

Question 2

During laparoscopic surgery, which vessel(s) should be specifically avoided during lateral trocar insertion?

Accepted Answer

Both Superior epigastric artery and Inferior epigastric artery

Answer

Superior epigastric artery

Answer

Abdominal aorta

Answer

Inferior epigastric artery

Question 3

Which instrument is primarily used to establish pneumoperitoneum in closed laparoscopy technique?

Accepted Answer

Veress needle

Answer

Jamshidi needle

Answer

3 mm Trocar

Answer

Hasson's cannula

Question 4

Which of the following about Minimal Access Surgery are correct?
I. Decreased intraoperative heat loss
II. Improved visualization
III. Increased chances of herniation
IV. Improved mobility

Select the answer using the code given below :

Accepted Answer

I, II and IV

Answer

I, III and IV

Answer

I, II and III

Answer

II, III and IV

Question 5

Laparoscopic instruments are best sterilized by :

Accepted Answer

Autoclaving

Answer

Ethylene oxide

Answer

Hot air oven

Answer

2% Glutaraldehyde

Question 6

‘Swiss cheese defects’ of anterior abdominal wall after exploratory laparotomy is best seen while doing:

Accepted Answer

Laparoscopic ventral hernia repair

Answer

Open inguinal hernia repair

Answer

Open ventral hernia repair

Answer

Laparoscopic inguinal hernia repair

Question 7

The Chief of laparoscopic surgery asked his assistant to give him a laparoscopic port which has absolutely no chance of "capacitance coupling" during laparoscopic surgery. Which port should the assistant give to the Chief?

Accepted Answer

Complete plastic port

Answer

Metal port with plastic cuff

Answer

Metal laparoscopic port

Answer

Partial plastic port

Question 8

“Triangle of Doom” dissected and seen during Laparoscopic inguinal hernia repair is bounded by all EXCEPT:

Accepted Answer

Peritoneal fold

Answer

Vas deferens

Answer

Gonadal vessels

Answer

Cord structures

Question 9

Which one of the following is the safest gas for creating pneumoperitoneum in operative laparoscopy?

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Carbon monoxide

Answer

Nitrous oxide

Question 10

Consider the following statements:

1. Carbon dioxide is the safest gas for creating pneumoperitoneum in operative laparoscopy.
2. Laparoscopic sterilization is not recommended during the period of immediate postpartum. Which of the statements given above is/are correct?

Accepted Answer

Both 1 and 2

Answer

1 only

Answer

Neither 1 nor 2

Answer

2 only

Minimally Invasive Surgery — MCQs

Minimally Invasive Surgery — MCQs

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