General Surgery Principles Practice Questions

Q: When using colloid infusion for the treatment of shock, what is the ratio at which blood loss is compensated?

1:1. ### Explanation The correct answer is **1:1 (Option B)**. **Why it is correct:** The goal of fluid resuscitation in shock is to restore intravascular volume. Colloids (such as Albumin, Dextran, or Hydroxyethyl starch) consist of large molecules that do not easily cross the semi-permeable capillary membrane. Because these molecules remain within the intravascular compartment, they exert a high oncotic pressure, effectively "holding" the fluid in the bloodstream. Therefore, to replace a specific volume of blood loss, an equal volume of colloid is required (a **1:1 ratio**). **Why the other options are incorrect:** * **1:3 (Option C):** This is the traditional ratio used for **Crystalloids** (like Normal Saline or Ringer’s Lactate). Crystalloids freely distribute between the intravascular and interstitial spaces. Only about 25-30% of infused crystalloid remains in the vessels after 20 minutes; thus, 3 mL of crystalloid is needed to replace 1 mL of blood loss. * **1:2 and 1:5 (Options A & D):** These ratios do not correspond to standard resuscitation protocols for acute blood loss. While some modern guidelines suggest a 1.5:1 or 2:1 ratio for crystalloids to avoid fluid overload, 1:1 remains the definitive physiological rule for colloids. **High-Yield Clinical Pearls for NEET-PG:** * **Crystalloid vs. Colloid:** Crystalloids are the first-line fluid for hemorrhagic shock (ATLS guidelines). Colloids are more expensive and carry risks of coagulopathy and anaphylaxis. * **The "3-for-1" Rule:** Always associate the 3:1 ratio with crystalloids and the 1:1 ratio with colloids or blood products. * **Albumin:** The most commonly used natural colloid; 5% albumin is iso-oncotic, while 25% albumin is hyper-oncotic (draws fluid from the interstitium). * **Dextran Warning:** Can interfere with blood cross-matching and may decrease platelet aggregation.

Q: What is the first step in performing a pneumonectomy for cancer of the bronchus?

Ligate the pulmonary artery. In surgery for bronchogenic carcinoma, the sequence of vessel ligation is critical to prevent the hematogenous spread of tumor cells. **Why the Pulmonary Artery is ligated first:** The standard surgical principle in oncological pneumonectomy is to **ligate the pulmonary artery first**. By cutting off the inflow (arterial supply) while keeping the outflow (venous drainage) intact for a few moments, the surgeon prevents the "congestion" of the lung. More importantly, it minimizes the risk of squeezing tumor emboli into the systemic circulation, which could occur if the veins were ligated while the artery continued to pump blood into the tumor-bearing lung. **Analysis of Incorrect Options:** * **Ligate the pulmonary vein:** If the vein is ligated first, the arterial pressure continues to engorge the lung, potentially forcing malignant cells into the capillary bed or dislodging them into the left atrium once the vein is manipulated. * **Divide the bronchus:** This is typically the final major step of the resection. Early division would obscure the hilar anatomy and increase the risk of contamination. * **Perform lymph node clearance:** While essential for staging and prognosis, formal lymphadenectomy (mediastinal nodal dissection) is performed during or after the mobilization and resection of the lung, not as the very first step. **High-Yield Clinical Pearls for NEET-PG:** * **Exception to the Rule:** In cases of **highly vascular tumors** or when there is significant manipulation required, some surgeons advocate for early venous ligation to prevent "shedding," but for the purpose of standard surgical exams, **Artery First** remains the classic teaching. * **Order of structures in the Hilum (Anterior to Posterior):** Vein, Artery, Bronchus (**VAB**). * **Order of structures in the Hilum (Superior to Inferior):** * Right side: Bronchus, Artery, Vein (**BAV**) * Left side: Artery, Bronchus, Vein (**ABV**)

Q: A 45-year-old male with a history of polyuria presents with a foot condition. What is the most likely diagnosis?

Diabetic foot ulcer. ***Diabetic foot ulcer*** - **Polyuria** is a classic symptom of **diabetes mellitus**, indicating poor glycemic control that predisposes to diabetic complications. - Diabetic foot ulcers typically occur over **pressure points** (metatarsal heads, heels) due to **peripheral neuropathy** and **vascular compromise**. *Venous ulcer* - Typically occurs in the **medial malleolar region** and is associated with **chronic venous insufficiency** and **edema**. - History of **polyuria** does not correlate with venous pathology, making this diagnosis unlikely. *Buerger's disease* - Primarily affects **young male smokers** and involves **small to medium-sized arteries** with inflammatory occlusion. - Presents with **claudication** and **rest pain**, but lacks association with **polyuria** or metabolic disorders. *Frostbite* - Results from **cold exposure** causing tissue freezing and subsequent **necrosis** and **gangrene**. - Has no relationship to **polyuria** or metabolic conditions, and requires a clear history of cold exposure.

Q: What is the primary treatment for a perforated peptic ulcer?

Vagotomy and repair of perforation. **Explanation:** The primary goal in managing a perforated peptic ulcer is twofold: addressing the acute surgical emergency (peritonitis) and treating the underlying acid-peptic disease. **Why Option C is Correct:** In the context of traditional surgical teaching for NEET-PG, **Vagotomy and repair of perforation** is considered the definitive treatment. While the perforation is closed (usually with an omental patch), the **Vagotomy** (typically Truncated or Selective) addresses the etiology by reducing gastric acid secretion, thereby preventing recurrence. This combined approach manages both the complication and the disease. **Analysis of Incorrect Options:** * **Option A & B (Vagotomy with Pyloroplasty/Antrectomy):** These are definitive acid-reduction surgeries but are generally too extensive and time-consuming in the setting of acute bacterial peritonitis. Performing a resection (Antrectomy) or altering gastric emptying (Pyloroplasty) in an unstable, septic patient increases morbidity significantly. * **Option D (Graham’s Repair):** This refers to the placement of a pedicled omental patch over the perforation. While it is the **most common emergency procedure** performed today (especially in the era of PPIs), it is technically a "repair" only. Without a vagotomy or long-term medical management, it does not address the underlying hyperacidity. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** X-ray Erect Abdomen (shows free gas under the diaphragm in 75% of cases). * **Gold Standard Investigation:** NCCT Abdomen (most sensitive). * **Modified Graham’s Patch:** The current standard where the omentum is placed *over* the primary sutures rather than plugged into the hole. * **Conservative Management:** Known as **Taylor’s Method** (aspirations, antibiotics, and fluids), reserved only for stable patients with "sealed" perforations.

Q: Indications for surgery in Bronchiectasis include all of the following except?

Severe hemoptysis. In the management of bronchiectasis, surgery is primarily reserved for patients who fail medical therapy and have **localized disease** that can be safely resected. ### **Explanation of the Correct Answer** **Option A (Severe hemoptysis)** is the correct answer because it is generally considered a **contraindication** or a situation where surgery is deferred in favor of less invasive interventions. In the acute setting of massive/severe hemoptysis, the first-line treatment is **Bronchial Artery Embolization (BAE)**. Surgery in an unstable patient with active bleeding carries high mortality and morbidity. Resection is only considered electively once the patient is stabilized and the site of bleeding is localized. ### **Analysis of Other Options** * **B. Copious symptoms with localized disease:** This is the classic indication. If a patient has persistent cough and sputum production confined to a single lobe/segment that doesn't respond to antibiotics and chest physiotherapy, surgical resection (e.g., lobectomy) offers a potential cure. * **C. Recurrent or severe bleeding:** While "severe" bleeding is managed by BAE initially, **recurrent** episodes of significant bleeding from a localized area are a strong indication for elective surgery to prevent future life-threatening events. * **D. Recurrent infections:** Patients suffering from frequent, localized exacerbations that lead to lung scarring or abscess formation despite optimal medical management are ideal candidates for surgery. ### **NEET-PG High-Yield Pearls** * **Gold Standard Investigation:** High-Resolution CT (HRCT) scan (shows "Signet ring sign" or "Tram-track opacities"). * **Most Common Cause (Worldwide):** Post-infectious (Tuberculosis). * **Surgical Prerequisite:** Adequate pulmonary reserve (FEV1 > 1L) and disease localization to one or two lobes. * **Kartagener Syndrome:** A subset of bronchiectasis (Triad: Situs inversus, Bronchiectasis, Sinusitis).

Q: What is true about Marjolin's ulcer?

Ulcer over a scar. **Explanation:** **Marjolin’s ulcer** refers to a specific type of **Squamous Cell Carcinoma (SCC)** that arises in areas of chronic inflammation, long-standing scars, or non-healing wounds. 1. **Why Option A is Correct:** The hallmark of a Marjolin’s ulcer is its development over a **pre-existing scar**, most commonly a **post-burn contracture scar**. It can also occur in chronic osteomyelitis sinuses, venous ulcers, or vaccination scars. The malignant transformation occurs due to constant irritation and poor lymphatic drainage in the scarred tissue. 2. **Why Other Options are Incorrect:** * **B. Rapid growth:** Marjolin’s ulcers are typically characterized by a **slow growth rate** and a very long latent period (averaging 25–30 years) between the initial injury and the onset of malignancy. * **C. Rodent ulcer:** This is a clinical term for **Basal Cell Carcinoma (BCC)**, which typically occurs on sun-exposed skin (above the line joining the tragus to the angle of the mouth). Marjolin’s ulcer is histologically a Squamous Cell Carcinoma. * **D. Painful:** Interestingly, Marjolin’s ulcers are characteristically **painless** because the scar tissue in which they develop is devoid of sensory nerve fibers. **NEET-PG High-Yield Pearls:** * **Most common site:** Lower limb (due to chronic venous ulcers or burn scars). * **Lymphadenopathy:** Usually absent initially because the dense scar tissue acts as a barrier to lymphatic spread. However, if it does spread, it is highly aggressive. * **Diagnosis:** Confirmed by edge biopsy. * **Treatment:** Wide local excision (with a 2 cm margin) or amputation.

Q: Which of the following is common in all forms of shock?

Impaired tissue perfusion. **Explanation:** **1. Why "Impaired tissue perfusion" is correct:** Shock is fundamentally defined as a state of **acute circulatory failure** where the oxygen delivery to the tissues is insufficient to meet the metabolic demands. Regardless of the underlying cause (be it pump failure, fluid loss, or infection), the common denominator in all forms of shock is **impaired tissue perfusion**. This leads to cellular hypoxia, a shift from aerobic to anaerobic metabolism, lactic acidosis, and eventually, multi-organ dysfunction syndrome (MODS). **2. Why the other options are incorrect:** * **Sepsis (A):** This is the etiology specifically for *Septic Shock* (a type of distributive shock). It is not present in hypovolemic, cardiogenic, or obstructive shock. * **Hypovolemia (B):** This refers to a decrease in intravascular volume. While it is the hallmark of *Hypovolemic Shock*, other forms like cardiogenic shock may actually present with fluid overload (hypervolemia). * **Vasoconstriction (C):** This is a compensatory mechanism seen in "Cold Shock" (Hypovolemic and Cardiogenic). However, in "Warm Shock" (early Septic/Distributive shock), there is widespread **vasodilation** rather than vasoconstriction. Therefore, it is not common to all types. **3. NEET-PG High-Yield Pearls:** * **The "Gold Standard" for monitoring tissue perfusion:** Serum Lactate levels (rising lactate indicates anaerobic metabolism). * **Mixed Venous Oxygen Saturation ($SvO_2$):** Usually decreased in most shocks, but may be **normal or high** in Septic Shock due to impaired oxygen extraction at the tissue level. * **End-organ markers of shock:** Oliguria (Urine output <0.5 ml/kg/hr), altered mental status, and metabolic acidosis. * **Distributive Shock** is the only type where Systemic Vascular Resistance (SVR) is primarily **decreased**.

Q: What is the daily requirement of sodium in an adult?

50-90 mM. **Explanation:** The maintenance of fluid and electrolyte balance is a cornerstone of surgical care. In a healthy adult, the daily requirement for **Sodium (Na+) is approximately 1 to 1.5 mmol/kg/day**. For an average 60–70 kg adult, this translates to roughly **50–90 mmol/day** (often cited as 70–100 mmol in some texts). This amount is sufficient to cover obligatory losses through urine, sweat, and feces while maintaining plasma osmolality. **Analysis of Options:** * **Option B (50-90 mM):** This is the correct physiological range for maintenance. In clinical practice, this is typically provided by 1–2 liters of Normal Saline (0.9% NaCl contains 154 mmol/L) or balanced salt solutions. * **Option A (30-40 mM):** This is below the standard maintenance requirement for a healthy adult and may lead to hyponatremia if continued long-term without adequate intake. * **Option C & D (80-150 mM):** These ranges exceed the standard daily requirement. While the kidneys can usually excrete excess sodium, providing 120–150 mmol/day unnecessarily increases the risk of fluid overload and hypernatremia, especially in post-operative patients with increased ADH secretion. **High-Yield Clinical Pearls for NEET-PG:** * **Potassium (K+) Requirement:** 0.5–1 mmol/kg/day (approx. 40–60 mmol/day). * **Water Requirement:** 30–40 ml/kg/day (approx. 2–2.5 Liters/day). * **Caloric Requirement:** 25–30 kcal/kg/day. * **Post-operative Fluid Shift:** In the first 24–48 hours post-surgery, the body undergoes a "stress response," leading to sodium and water retention due to increased Aldosterone and ADH. Therefore, over-replacement of sodium during this period should be avoided to prevent pulmonary edema.

Question 1

When using colloid infusion for the treatment of shock, what is the ratio at which blood loss is compensated?

Accepted Answer

1:1

Answer

1:2

Answer

1:3

Answer

1:5

Question 2

What is the first step in performing a pneumonectomy for cancer of the bronchus?

Accepted Answer

Ligate the pulmonary artery

Answer

Ligate the pulmonary vein

Answer

Divide the bronchus

Answer

Perform lymph node clearance

Question 3

A 45-year-old male with a history of polyuria presents with a foot condition. What is the most likely diagnosis?

Accepted Answer

Diabetic foot ulcer

Answer

Venous ulcer

Answer

Buerger's disease

Answer

Frostbite

Question 4

What is the primary treatment for a perforated peptic ulcer?

Accepted Answer

Vagotomy and repair of perforation

Answer

Vagotomy and Pyloroplasty

Answer

Vagotomy and Antrectomy

Answer

Graham's repair

Question 5

Indications for surgery in Bronchiectasis include all of the following except?

Accepted Answer

Severe hemoptysis

Answer

Copious symptoms with localized disease

Answer

Recurrent or severe bleeding

Answer

Recurrent infections

Question 6

What is true about Marjolin's ulcer?

Accepted Answer

Ulcer over a scar

Answer

Rapid growth

Answer

Rodent ulcer

Answer

Painful

Question 7

Which of the following is common in all forms of shock?

Accepted Answer

Impaired tissue perfusion

Answer

Sepsis

Answer

Hypovolemia

Answer

Vasoconstriction

Question 8

What is the daily requirement of sodium in an adult?

Accepted Answer

50-90 mM

Answer

30-40 mM

Answer

80-120 mM

Answer

120-150 mM

Question 9

Which of the following is NOT true about abdominal compartment syndrome?

Accepted Answer

Decreased pulmonary venous pressure

Answer

Intra-abdominal pressure >15 cm of H2O

Answer

Intra-abdominal pressure measured using Foley catheterization of the bladder

Answer

With >25-30 mm Hg intra-abdominal pressure, life-threatening hypoxia and ARDS can occur

Question 10

What is true about intra-abdominal compartment syndrome?

Accepted Answer

Intra-abdominal pressure greater than 15 cm H2O is a diagnostic criterion.

Answer

Pneumoperitoneum can produce it.

Answer

It leads to decreased renal blood flow.

Answer

All of the above.

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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