Laparoscopic Cholecystectomy — MCQs

10 questions

Which of the following surgical incisions is associated with the highest risk of postoperative pulmonary complications ?

A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?

Cholestasis may lead to the following complications except:

Cholecystocaval line:-

Which of the following is NOT a contraindication for laparoscopic cholecystectomy?

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

Which of the following structures does NOT pass through Calot's triangle?

What is the primary aim of performing an abbreviated laparotomy in trauma surgery?

Which of the following is least required for visualization of the gallbladder in oral cholecystography?

Q10

Best gas used for creating pneumoperitoneum at laparoscopy is:

Laparoscopic Cholecystectomy Indian Medical PG Practice Questions and MCQs

Question 1: Which of the following surgical incisions is associated with the highest risk of postoperative pulmonary complications ?

A. Median sternotomy
B. Horizontal laparotomy
C. Vertical laparotomy
D. Lateral thoracotomy (Correct Answer)

Explanation: ***Lateral thoracotomy*** - **Lateral thoracotomy** is associated with the **highest risk of postoperative pulmonary complications** among common surgical incisions, with complication rates ranging from **15-70%** depending on the procedure. - This incision **directly violates the chest wall** with rib resection or spreading, causing severe postoperative pain that significantly impairs respiratory mechanics. - The procedure disrupts **intercostal muscles**, damages **intercostal nerves**, and violates the **pleura**, leading to immediate risks like **pneumothorax**, **hemothorax**, and **pleural effusion**. - Severe pain leads to **splinting**, **shallow breathing**, **impaired cough**, and **reduced lung expansion**, markedly increasing the risk of **atelectasis**, **pneumonia**, and **respiratory failure**. - The **ipsilateral lung** is particularly affected with reduced functional residual capacity and impaired secretion clearance. *Vertical laparotomy* - **Upper abdominal vertical incisions** are indeed associated with high pulmonary complication rates (**30-50%**), second only to thoracotomy. - Pain leads to **diaphragmatic splinting** and impaired respiratory mechanics, increasing risk of **atelectasis** and **pneumonia**. - However, the chest wall itself remains intact, making complications generally less severe than with thoracotomy. *Median sternotomy* - While a major thoracic procedure, **median sternotomy** has relatively **lower pulmonary complication rates** compared to lateral thoracotomy. - The sternal split preserves **intercostal muscles** and **nerve integrity**, resulting in less severe pain and better preserved respiratory mechanics. - Postoperative pain management is generally more effective than with lateral thoracotomy. *Horizontal laparotomy* - **Transverse abdominal incisions** (e.g., Pfannenstiel, transverse supraumbilical) cause significantly less pain than vertical incisions. - These incisions follow **natural tissue planes**, cause less muscle disruption, and allow better respiratory mechanics. - Lower pain levels facilitate **effective coughing**, **deep breathing**, and **early mobilization**, reducing pulmonary complication risk.

Question 2: A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?

A. Postoperative administration for 5 to 7 days of parenteral antibiotics effective against aerobes and anaerobes
B. A single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes may provide initial coverage. (Correct Answer)
C. Postoperative administration for 2 to 4 days of parenteral antibiotics effective against aerobes and anaerobes
D. Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile

Explanation: ***Single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes*** - For **elective colorectal surgery**, a single dose of a **broad-spectrum parenteral antibiotic** administered within 60 minutes prior to incision is the standard of care to reduce surgical site infections. - This approach ensures adequate drug levels in the tissues during the period of potential bacterial contamination and is a cornerstone of modern surgical prophylaxis. - Current guidelines (WHO, SCIP) recommend a single preoperative dose, which may be redosed intraoperatively if the procedure is prolonged beyond 3-4 hours. *Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile* - This is **incorrect**. **Oral antibiotics** (such as neomycin and metronidazole) are routinely used preoperatively in conjunction with mechanical bowel preparation for colorectal surgery to reduce intraluminal bacterial load. - The concern for *Clostridioides difficile* infection is generally low with short-term, targeted prophylactic antibiotic regimens compared to broad-spectrum, prolonged use. - The combination of oral and parenteral antibiotics has been shown to further reduce surgical site infections. *Postoperative administration for 5 to 7 days of parenteral antibiotics* - **Prolonged postoperative antibiotic administration** beyond 24 hours in uncomplicated cases is not recommended as it increases the risk of **antibiotic resistance**, *C. difficile* infection, and adverse drug reactions without additional benefit. - The goal of prophylactic antibiotics is to cover the period of contamination during surgery, not to treat presumed ongoing infection postoperatively. *Postoperative administration for 2 to 4 days of parenteral antibiotics* - While administration for up to 24 hours post-operatively may be considered in some high-risk cases, routine **prolonged postoperative antibiotics** (2-4 days) are unnecessary for most elective colorectal resections. - Evidence suggests that continuing antibiotics beyond the immediate perioperative period does not further reduce the incidence of **surgical site infections** in clean-contaminated surgeries.

Question 3: Cholestasis may lead to the following complications except:

A. Meconium stained liquor
B. Preterm labour
C. Intrauterine fetal death
D. Maternal jaundice (Correct Answer)

Explanation: ***Maternal jaundice*** - While cholestasis, particularly **intrahepatic cholestasis of pregnancy (ICP)**, can cause **pruritus and elevated bile acids**, clinically significant **maternal jaundice is uncommon** (occurring in only 10-25% of cases, typically mild). - Maternal jaundice is more of a **clinical manifestation** rather than a serious **complication** of concern in cholestasis. - In contrast, the **major complications of cholestasis are fetal in nature** and represent the primary clinical concerns requiring active management. *Intrauterine fetal death* - **Elevated bile acids** in the maternal circulation cross the placenta and become toxic to the fetus, significantly increasing the risk of **sudden intrauterine fetal death (IUFD)**. - The mechanism involves **fetal cardiac arrhythmias** and myocardial dysfunction due to bile acid accumulation in cardiac cells. - This is the **most serious complication** and the reason for close monitoring and early delivery in cholestasis. *Meconium stained liquor* - Cholestasis is associated with increased incidence of **meconium-stained amniotic fluid** due to fetal distress. - Elevated bile acids are thought to stimulate **fetal gut motility** and cause premature passage of meconium. - This reflects fetal compromise and increased risk of meconium aspiration syndrome. *Preterm labour* - Women with cholestasis have significantly higher rates of **spontaneous preterm labor**, necessitating planned early delivery (typically around 37 weeks). - Bile acids may have **direct effects on uterine contractility** through alterations in prostaglandin metabolism and myometrial sensitivity. - This is a recognized complication requiring obstetric intervention and monitoring.

Question 4: Cholecystocaval line:-

A. Separate left medial and left lateral sectors
B. Separate right anterior and right posterior sectors
C. Separate gall bladder from portal vein
D. Separate right and left hepatic lobes (Correct Answer)

Explanation: ***Separate right and left hepatic lobes*** - The **cholecystocaval line**, also known as **Cantlie's line**, is an imaginary plane that divides the **anatomical right and left lobes** of the liver [1]. - This line runs from the **gallbladder fossa** anteriorly to the **inferior vena cava (IVC)** posteriorly. *Separate left medial and left lateral sectors* - The division between the **left medial (segment IV)** and **left lateral (segments II and III)** sectors of the liver is demarcated by the **left hepatic vein** or the falciform ligament internally [3], [4]. - The cholecystocaval line's primary function is not to separate these specific left lobe sectors. *Separate right anterior and right posterior sectors* - The division between the **right anterior (segments V and VIII)** and **right posterior (segments VI and VII)** sectors of the liver is typically defined by the **right hepatic vein** [2]. - This anatomical landmark is distinct from the cholecystocaval line. *Separate gall bladder from portal vein* - The cholecystocaval line is a plane that **originates from the gallbladder**, but it divides the liver parenchyma rather than separating the gallbladder itself from the portal vein. - The gallbladder is a separate organ adjacent to the liver, and the portal vein is a major vessel within the liver parenchyma [1].

Question 5: Which of the following is NOT a contraindication for laparoscopic cholecystectomy?

A. Patients with severe liver cirrhosis and portal hypertension
B. Patients with obesity (Correct Answer)
C. Patients with a history of previous abdominal surgery
D. Patients with severe chronic obstructive pulmonary disease (COPD)

Explanation: ***Patients with obesity*** - **Obesity** is not a contraindication for laparoscopic cholecystectomy and is actually often considered a **relative indication** for the laparoscopic approach over open surgery. - Laparoscopic cholecystectomy in obese patients offers significant advantages including reduced wound complications, decreased infection rates, better cosmesis, and faster recovery. - While technically more challenging due to thicker abdominal wall and increased intra-abdominal fat, experienced surgical teams routinely perform laparoscopic cholecystectomy in obese patients safely. *Patients with severe liver cirrhosis and portal hypertension* - **Severe liver cirrhosis and portal hypertension** are considered absolute or strong contraindications due to significantly increased risk of bleeding from dilated collateral vessels and impaired coagulation. - Pneumoperitoneum can further compromise hepatic blood flow and worsen portal hypertension. - These patients often require open surgery with careful hemostasis or medical management due to prohibitively high operative risk. *Patients with severe chronic obstructive pulmonary disease (COPD)* - Patients with **severe COPD** with poor pulmonary reserve may have difficulty tolerating pneumoperitoneum due to increased intrathoracic pressure, reduced diaphragmatic excursion, and decreased ventilation-perfusion matching. - Hypercarbia from CO₂ absorption and increased airway pressures can lead to significant respiratory compromise in patients with limited pulmonary reserve. - While mild-moderate COPD is not a contraindication with appropriate anesthetic management, severe COPD with inability to tolerate pneumoperitoneum constitutes a contraindication. *Patients with a history of previous abdominal surgery* - A history of **previous abdominal surgery** is considered at most a **relative contraindication**, not an absolute one, and is routinely managed in modern laparoscopic practice. - While intra-abdominal adhesions may increase technical difficulty and risk of bowel injury, techniques like open Hassan port insertion and careful adhesiolysis allow safe laparoscopic surgery in most cases. - Previous surgery requires careful preoperative assessment and may necessitate modified port placement or conversion to open if dense adhesions are encountered, but does not preclude attempting laparoscopy.

Question 6: 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 7: Which of the following structures does NOT pass through Calot's triangle?

A. Right hepatic artery
B. Lymph node of Lund
C. Portal vein (Correct Answer)
D. Cystic artery

Explanation: ***Portal vein*** - The **portal vein** is a major vessel that carries venous blood from the gastrointestinal tract and spleen to the liver; it is located within the **porta hepatis** and does not pass through Calot's triangle. - Its position is medial and posterior to the structures within Calot's triangle, making it an unlikely structure to be inadvertently ligated during cholecystectomy. *Cystic artery* - The **cystic artery** is a consistent structure found within Calot's triangle, typically arising from the **right hepatic artery**. - Its presence in the triangle makes it a primary target for ligation during **cholecystectomy**. *Right hepatic artery* - The **right hepatic artery** typically runs **superior to Calot's triangle** and gives off the cystic artery which enters the triangle. - While the right hepatic artery itself does not routinely pass through the triangle, anatomical variations may bring it into close proximity, and it can be at risk of injury during dissection if the critical view of safety is not established. *Lymph node of Lund* - The **lymph node of Lund**, also known as the cystic lymph node, is a key landmark located within Calot's triangle. - Its presence is important for identifying the boundaries of the triangle and assessing for inflammation or malignancy related to the gallbladder.

Question 8: What is the primary aim of performing an abbreviated laparotomy in trauma surgery?

A. Definitive repair of all injuries
B. Reduction of contamination
C. Rapid stabilization of the patient
D. Haemostasis (Correct Answer)

Explanation: ***Haemostasis*** - The primary aim of abbreviated laparotomy (damage control surgery) is to achieve **rapid control of life-threatening hemorrhage**. - This involves temporary measures to stop bleeding from major vessels and solid organ injuries, preventing exsanguination and further physiological deterioration. - **Damage control prioritizes hemorrhage control over definitive repair**, using techniques like packing, shunts, and temporary vessel ligation. *Definitive repair of all injuries* - This is specifically **NOT** the goal of abbreviated laparotomy. - Definitive repairs are **delayed** until the patient is physiologically stable (after resuscitation in ICU). - Attempting complete repair in an unstable patient leads to the "lethal triad" (hypothermia, acidosis, coagulopathy). *Reduction of contamination* - While contamination control is an **important component** of damage control surgery, it is typically **secondary to hemorrhage control**. - The sequence prioritizes stopping bleeding first, then controlling contamination from bowel injuries. *Rapid stabilization of the patient* - This is the **overall goal** of damage control surgery but not the specific primary aim of the laparotomy itself. - Stabilization is achieved **through** specific interventions during the abbreviated laparotomy, primarily haemostasis and contamination control.

Question 9: Which of the following is least required for visualization of the gallbladder in oral cholecystography?

A. Patency of cystic duct (Correct Answer)
B. Motor mechanisms of gall bladder
C. Ability to absorb water
D. Functioning liver

Explanation: ***Patency of cystic duct*** - While a **patent cystic duct** is essential for bile to flow in and out of the gallbladder, the question asks what is *least* required for *visualization* of the gallbladder in oral cholecystography. - The contrast medium is absorbed, metabolized by the liver, and then concentrated in the gallbladder. The ability to concentrate is more critical for visualization than a patent cystic duct for this specific question. *Functioning liver* - A **functioning liver** is required to absorb the oral contrast agent from the intestine and then secrete it into the bile. - Without a functioning liver, the contrast agent cannot be processed and delivered to the gallbladder, making visualization impossible. *Motor mechanisms of gall bladder* - The **motor mechanisms** of the gallbladder are crucial for concentrating the bile and the contrast material. - The gallbladder absorbs water from the bile, increasing the concentration of the contrast agent, which enhances its visibility on X-ray. *Ability to absorb water* - The gallbladder's **ability to absorb water** from the bile is fundamental for concentrating the contrast medium. - This concentration process makes the gallbladder sufficiently radio-opaque to be visualized during oral cholecystography.

Question 10: 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.

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