Minimally Invasive Surgery Practice Questions

Q: Which of the following is NOT typically seen in pneumoperitoneum?

Bradycardia. In laparoscopic surgery, the creation of a pneumoperitoneum (typically using $CO_2$) triggers a series of physiological changes. **Why Bradycardia is the Correct Answer:** While the initial stretching of the peritoneum can trigger a transient **vasovagal reflex** leading to bradycardia, the *typical* and sustained hemodynamic response to pneumoperitoneum is **tachycardia**. Bradycardia is considered an acute complication or an idiosyncratic reflex rather than a typical physiological feature of a stable pneumoperitoneum. **Explanation of Other Options:** * **Hypertension (A):** Increased intra-abdominal pressure (IAP) causes the release of catecholamines and activation of the Renin-Angiotensin-Aldosterone System (RAAS). Additionally, systemic absorption of $CO_2$ increases systemic vascular resistance, leading to hypertension. * **Tachycardia (C):** The body compensates for decreased venous return (due to IVC compression) and hypercapnia by increasing the heart rate to maintain cardiac output. * **Hypercapnia (D):** $CO_2$ is highly soluble and is rapidly absorbed across the peritoneal surface into the bloodstream. If not compensated for by increasing minute ventilation, this leads to respiratory acidosis and hypercapnia. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Gas:** $CO_2$ is used because it is non-combustible, highly soluble (reducing air embolism risk), and inexpensive. * **Pressure Limits:** Standard IAP is maintained at **12–15 mmHg**. Pressures >20 mmHg significantly compromise venous return. * **Cardiac Output:** Generally **decreases** due to reduced venous return and increased afterload. * **Renal Effects:** Oliguria is common due to direct renal vein compression and reduced renal cortical blood flow.

Q: All of the following are true about laparoscopy except:

The flow of gas is 2 L/min. **Explanation:** In laparoscopic surgery, creating a pneumoperitoneum is the first critical step. This question tests your knowledge of the standard parameters and techniques used to achieve this. **Why Option D is the correct answer (False statement):** The initial flow of gas during the creation of pneumoperitoneum is typically set at a **low flow (1 L/min)** to ensure the needle is correctly positioned and to avoid rapid hemodynamic shifts. Once the position is confirmed and the procedure begins, the high-flow insufflator can deliver gas at rates of **10–40 L/min** to compensate for leaks and suctioning. A constant flow of 2 L/min is insufficient to maintain a stable working space during active surgery. **Analysis of other options:** * **Option A:** The **Veress needle** is the standard instrument for the **"Closed Technique"** of entry. It has a spring-loaded blunt stylet to prevent visceral injury. * **Option B:** The standard intra-abdominal pressure is maintained between **12–15 mm Hg**. Pressures above 15 mm Hg increase the risk of "Gas Embolism," decreased venous return, and respiratory compromise. * **Option C:** **CO₂** is the gas of choice because it is non-combustible (safe for cautery), highly soluble in blood (reducing the risk of fatal air embolism), and easily exhaled by the lungs. **High-Yield Clinical Pearls for NEET-PG:** * **Hasson’s Technique:** The "Open Method" of laparoscopy, preferred in patients with previous abdominal surgeries to avoid bowel injury. * **Safety Check for Veress:** The "Saline Drop Test" is used to confirm the needle is in the peritoneal cavity. * **Adverse Effect:** CO₂ retention can lead to **hypercapnia and respiratory acidosis**, which the anesthesiologist manages by increasing minute ventilation. * **Post-op Pain:** Shoulder tip pain after laparoscopy is due to diaphragmatic irritation by residual CO₂ (referred via the Phrenic nerve).

Q: The technique of laparoscopic cholecystectomy was first described by?

Erich Muhe. **Explanation:** The correct answer is **Erich Mühe**. In **1985**, German surgeon Erich Mühe performed the world’s first laparoscopic cholecystectomy using a "galloscope" he designed himself. Although he faced significant skepticism from the surgical community at the time, he is now globally recognized as the pioneer of the procedure. **Analysis of Options:** * **Erich Mühe (A):** Performed the first laparoscopic cholecystectomy in 1985 (Böblingen, Germany). * **Philippe Mouret (B):** Often confused with Mühe, Mouret performed the first **video-laparoscopic** cholecystectomy in **1987** (Lyon, France). While Mühe used a direct vision scope, Mouret’s use of a camera chip revolutionized the procedure's adoption. * **Kurt Semm (C):** A gynecologist who performed the first laparoscopic **appendectomy** in 1980. He is considered the father of modern operative laparoscopy and invented the automatic insufflator. * **Eddie Reddick (D):** An American surgeon who, along with Douglas Olsen, popularized the procedure in the United States and helped standardize the technique in the late 1980s. **High-Yield Clinical Pearls for NEET-PG:** * **First Laparoscopic Procedure:** The first diagnostic laparoscopy was performed by **Georg Kelling** (1901) on a dog, and **Hans Christian Jacobaeus** (1910) on humans. * **Standard of Care:** Laparoscopic cholecystectomy is currently the "Gold Standard" for symptomatic gallstones. * **Pneumoperitoneum:** $CO_2$ is the gas of choice due to its high solubility in blood (low risk of air embolism) and non-combustible nature. * **Critical View of Safety (Strasberg):** The essential step to prevent Bile Duct Injury (BDI) during the procedure.

Q: Which of the following is NOT an advantage of carbon dioxide used in laparoscopy?

Minimally absorbed. **Explanation:** The correct answer is **C (Minimally absorbed)** because Carbon Dioxide ($CO_2$) is actually **highly and rapidly absorbed** across the peritoneal membrane into the bloodstream. This high solubility is a double-edged sword: while it allows the body to easily buffer and exhale the gas via the lungs (preventing prolonged pneumoperitoneum), it can lead to **hypercapnia** and respiratory acidosis during surgery. **Analysis of Options:** * **A. Non-irritant:** $CO_2$ is generally considered non-irritating to the peritoneal lining compared to other gases, although its conversion to carbonic acid can cause some post-operative diaphragmatic irritation (referred pain to the shoulder). * **B. Non-inflammable:** This is a critical safety feature. Unlike oxygen or nitrous oxide, $CO_2$ does not support combustion, making it safe to use with electrosurgery (cautery) and lasers. * **D. No tissue reaction:** $CO_2$ is physiologically inert in terms of local tissue damage. It does not cause significant local inflammatory responses or tissue necrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Gas of Choice:** $CO_2$ is the standard gas for laparoscopy due to its high solubility (20 times that of oxygen), non-combustibility, and rapid excretion. * **The "Gas Embolism" Safety:** Because $CO_2$ is highly soluble in blood, if a small amount accidentally enters a blood vessel, it dissolves quickly, reducing the risk of a fatal air embolism compared to room air or nitrogen. * **Physiological Effect:** The rapid absorption of $CO_2$ requires the anesthesiologist to increase minute ventilation to prevent acidosis. * **Reflex Bradycardia:** Sudden stretching of the peritoneum by $CO_2$ insufflation can trigger a **vasovagal response**, leading to bradycardia.

Q: What is a contraindication for laparoscopy?

Diaphragmatic hernia. **Explanation:** The core physiological challenge in laparoscopy is the creation of a **pneumoperitoneum** using CO₂. This increases intra-abdominal pressure (IAP), which has significant systemic effects. **Why Diaphragmatic Hernia is the Correct Answer:** A diaphragmatic hernia (e.g., Congenital Diaphragmatic Hernia or large traumatic hernia) is considered a **relative/absolute contraindication** because the increased IAP forces abdominal contents and CO₂ into the thoracic cavity. This leads to: 1. **Massive Mediastinal Shift:** Compressing the contralateral lung and great vessels. 2. **Cardiovascular Collapse:** Reduced venous return and cardiac output. 3. **Tension Pneumothorax:** Risk of CO₂ tracking into the pleural space. While small hiatal hernias are routinely repaired laparoscopically, large defects pose a high risk of intraoperative respiratory failure. **Analysis of Incorrect Options:** * **B. Pelvic Tuberculosis:** While it may cause dense adhesions (making entry difficult), it is not a contraindication. Laparoscopy is often the "gold standard" for diagnosing pelvic TB via direct visualization and biopsy. * **C. Stress Urinary Incontinence (SUI):** Laparoscopic procedures (like the Burch Colposuspension) are standard surgical treatments for SUI. * **D. PCOD:** Laparoscopic Ovarian Drilling (LOD) is a common second-line surgical treatment for PCOD patients resistant to medical management. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Inability to tolerate formal laparotomy, uncorrected coagulopathy, and severe obstructive uropathy. * **Cardiovascular Impact:** Pneumoperitoneum decreases venous return (preload) and increases systemic vascular resistance (afterload). * **Gold Standard:** Laparoscopy is the preferred approach for cholecystectomy, appendectomy (especially in obese patients/females), and ectopic pregnancy.

Q: Laparoscopic cholecystectomy is largely preferred over conventional laparotomy for all of the following reasons EXCEPT:

Decreased incidence of bile duct injuries. **Explanation:** Laparoscopic cholecystectomy (LC) is the "gold standard" for the treatment of symptomatic gallstones. While it offers numerous advantages over open cholecystectomy, it is associated with a **higher incidence of bile duct injuries (BDI).** 1. **Why Option B is the Correct Answer:** In conventional open surgery, the incidence of BDI is approximately **0.1% to 0.2%**. In contrast, during the "learning curve" of laparoscopic surgery, this rate increased significantly. Even with modern techniques, the incidence of BDI in LC remains slightly higher at **0.3% to 0.5%**. This is primarily due to the loss of 3D depth perception, limited tactile feedback, and the risk of "misidentification" (e.g., mistaking the common bile duct for the cystic duct). 2. **Why other options are incorrect:** * **Decreased pain (A):** Smaller incisions result in less tissue trauma and reduced postoperative somatic pain. * **Smaller scar (C):** LC uses 5–10mm ports, providing a superior cosmetic outcome compared to a Kocher’s subcostal incision. * **Decreased hospital stay (D):** Faster recovery of bowel function and reduced pain allow for same-day or next-day discharge. **High-Yield Clinical Pearls for NEET-PG:** * **Critical View of Safety (Strasberg):** The gold standard technique to prevent BDI. It requires clearing the hepatocystic triangle of all fat/fibrous tissue and identifying only two structures (cystic duct and cystic artery) entering the gallbladder. * **Most common cause of BDI in LC:** Misidentification of anatomy. * **Management:** If BDI is recognized intraoperatively, immediate repair by a specialist is preferred. If found postoperatively (fever, jaundice, bile leak), the first investigation is **Ultrasound**, but the most definitive diagnostic tool is **MRCP**. * **Bile Duct Injury Classification:** The **Strasberg Classification** is most commonly used for laparoscopic injuries.

Q: What gas is most commonly used in laparoscopy?

Carbon Dioxide (CO2). **Explanation:** **Carbon Dioxide (CO₂)** is the gold standard and most commonly used gas for creating pneumoperitoneum in laparoscopy. The primary medical reason for its selection is its **high solubility in blood** (20 times more soluble than Oxygen). This high solubility ensures that if the gas accidentally enters the venous circulation, it is rapidly dissolved and excreted via the lungs, significantly reducing the risk of a fatal gas embolism. Furthermore, CO₂ is **non-combustible**, which is critical because electrosurgery (cautery) and lasers are frequently used during laparoscopic procedures. **Why other options are incorrect:** * **Sulfur Dioxide (SO₂):** This is a toxic, pungent gas and is never used in medical practice. * **Nitrogen (N₂):** It is poorly soluble in blood. If an embolism occurs, the bubbles persist for a long time, leading to severe cardiovascular collapse. * **Oxygen (O₂):** It is highly combustible and supports combustion, posing a major fire and explosion risk when using diathermy. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Intra-abdominal Pressure:** Usually maintained between **12–15 mmHg**. * **Physiological Effects:** CO₂ absorption can lead to **hypercapnia** and **respiratory acidosis**. * **Post-operative Pain:** Residual CO₂ irritating the diaphragm can cause referred pain to the **right shoulder** (Phrenic nerve irritation). * **Alternative:** **Nitrous Oxide (N₂O)** is sometimes used because it provides better analgesia, but it is less safe than CO₂ regarding combustion.

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.

Question 1

Which of the following is NOT typically seen in pneumoperitoneum?

Accepted Answer

Bradycardia

Answer

Hypertension

Answer

Tachycardia

Answer

Hypercapnia

Question 2

All of the following are true about laparoscopy except:

Accepted Answer

The flow of gas is 2 L/min

Answer

Veress needle is used in the closed method

Answer

Intra-abdominal pressure maintained during laparoscopy is 12-15 mm Hg

Answer

The most commonly used gas is CO2

Question 3

Which layers are penetrated with a trocar and cannula during the production of pneumoperitoneum?

Accepted Answer

Skin and superficial fascia

Answer

Deep fascia

Answer

Rectus abdominis

Answer

Transversus abdominis

Question 4

The technique of laparoscopic cholecystectomy was first described by?

Accepted Answer

Erich Muhe

Answer

Philip Moure

Answer

Ku semm

Answer

Eddie Reddick

Question 5

Which of the following is NOT an advantage of carbon dioxide used in laparoscopy?

Accepted Answer

Minimally absorbed

Answer

Non-irritant

Answer

Non-inflammable

Answer

No tissue reaction

Question 6

What is a contraindication for laparoscopy?

Accepted Answer

Diaphragmatic hernia

Answer

Pelvic tuberculosis

Answer

Stress urinary incontinence

Answer

PCOD

Question 7

Laparoscopic cholecystectomy is largely preferred over conventional laparotomy for all of the following reasons EXCEPT:

Accepted Answer

Decreased incidence of bile duct injuries

Answer

Decreased pain

Answer

Smaller scar

Answer

Decreased hospital stay

Question 8

What gas is most commonly used in laparoscopy?

Accepted Answer

Carbon Dioxide (CO2)

Answer

Sulfur Dioxide (SO2)

Answer

Nitrogen (N2)

Answer

Oxygen (O2)

Question 9

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 10

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

Minimally Invasive Surgery — MCQs

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