General Surgery Principles Practice Questions

Q: What is the target maintenance level for mixed venous oxygen saturation in the management of shock?

50-70%. ### Explanation **Concept:** Mixed venous oxygen saturation ($SvO_2$) is a global indicator of the balance between systemic oxygen delivery ($DO_2$) and oxygen consumption ($VO_2$). In shock, tissues extract more oxygen due to decreased delivery, leading to a drop in $SvO_2$. Monitoring $SvO_2$ (via a pulmonary artery catheter) or $ScvO_2$ (central venous saturation) helps clinicians assess the adequacy of cardiac output and tissue perfusion. **Why 50-70% is Correct:** The normal range for $SvO_2$ is **65-75%**. In the management of shock, the therapeutic goal is to maintain $SvO_2$ within the **50-70%** range (specifically aiming for $>65\%$ or $ScvO_2 >70\%$). This range indicates that oxygen delivery is sufficient to meet metabolic demands without excessive tissue extraction. **Analysis of Incorrect Options:** * **A ( 70%):** While normal in healthy individuals, a very high $SvO_2$ in a shocked patient (especially septic shock) can be pathological. It often indicates **cytopathic dysoxia** (tissues cannot utilize oxygen) or **microcirculatory shunting**, where blood bypasses capillary beds. **High-Yield Clinical Pearls for NEET-PG:** * **$ScvO_2$ vs. $SvO_2$:** Central venous oxygen saturation ($ScvO_2$) is usually **2-3% higher** than $SvO_2$ because it does not include desaturated blood from the coronary sinus. * **Early Goal-Directed Therapy (EGDT):** Rivers’ protocol for sepsis traditionally targeted an $ScvO_2 \geq 70\%$. * **Fick’s Principle:** $SvO_2$ is determined by four factors: Hemoglobin, $SaO_2$ (arterial saturation), Cardiac Output, and $VO_2$ (consumption).

Q: Antibioma is best treated by?

Complete resection. **Explanation:** An **Antibioma** is a chronic, non-tender, firm inflammatory mass that develops when an abscess is treated with antibiotics without adequate surgical drainage. The antibiotics sterilize the pus or suppress the acute infection, but the body fails to resorb the debris, leading to the formation of a thick, fibrous capsule around the inspissated material. **Why Complete Resection is the Correct Answer:** Once a thick fibrous wall has formed, the lesion becomes "walled off." Antibiotics cannot penetrate this dense capsule in therapeutic concentrations, and the body cannot naturally resolve the mass. Therefore, **complete surgical excision (resection)** of the mass along with its fibrous capsule is the definitive treatment to ensure complete resolution and prevent recurrence. **Analysis of Incorrect Options:** * **Partial Resection:** This is inadequate as leaving behind any portion of the infected/fibrous tissue leads to persistent inflammation or sinus formation. * **Aspiration:** The contents of an antibioma are often thick, inspissated, or organized. Simple needle aspiration is usually unsuccessful because the material is too viscous to be drawn through a needle and the thick wall remains intact. * **Administration of Antibiotics:** This is the original cause of the condition. Further antibiotic therapy is ineffective because the lack of vascularity in the fibrous capsule prevents the drug from reaching the core of the mass. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** A patient with a history of a painful swelling (abscess) that became painless and firm after taking antibiotics, but never fully disappeared. * **Common Site:** Often seen in the breast (following mastitis) or in the gluteal region (following injection abscesses). * **Key Concept:** "Pus anywhere must be drained." Antibioma is a classic example of the failure of this surgical principle.

Q: Which of the following is the most common type of splenic cyst?

Pseudocyst. **Explanation:** Splenic cysts are relatively uncommon clinical entities, but they are frequently tested in surgical exams. They are broadly classified into **Primary (True) cysts**, which possess an epithelial lining, and **Secondary (False) cysts**, which lack one. **Why Pseudocyst is correct:** **Pseudocysts (Secondary cysts)** are the most common type of splenic cyst, accounting for approximately **75-80% of all non-parasitic splenic cysts**. They typically develop as a late complication of **blunt abdominal trauma**, which leads to an intraparenchymal or subcapsular hematoma that subsequently liquefies and develops a fibrous wall without an epithelial lining. **Analysis of Incorrect Options:** * **Parasitic infection (Option C):** While *Echinococcus granulosus* (Hydatid disease) is the most common cause of **true** splenic cysts worldwide (especially in endemic areas), it is less common than post-traumatic pseudocysts globally. * **Congenital anomaly (Option D):** These are "True cysts" (Epidermoid cysts) present from birth. They are lined by squamous epithelium and are the most common type of primary non-parasitic cyst, but they are rarer than pseudocysts. * **Bacterial infection (Option A):** Bacterial infections of the spleen usually result in **splenic abscesses** rather than simple cysts. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of splenic cyst overall:** Pseudocyst (Post-traumatic). * **Most common "True" cyst:** Epidermoid cyst (Congenital). * **Tumor Marker:** Epidermoid cysts may show elevated serum **CA 19-9** levels. * **Management:** Small, asymptomatic cysts (<5 cm) are managed conservatively. Large or symptomatic cysts require surgical intervention (preferably **partial splenectomy** or cyst decortication to preserve splenic immune function).

Q: What is true about hydatid disease?

20% saline is scolicidal.. Hydatid disease (Cystic Echinococcosis) is caused by the larval stage of *Echinococcus granulosus*. Understanding its management and characteristics is high-yield for NEET-PG. ### **Explanation of Options** * **Option C (Correct):** Scolicidal agents are used during surgery (especially during the PAIR procedure) to kill the infective protoscolices and prevent secondary hydatidosis due to accidental spillage. **20% Hypertonic saline** is the most commonly used scolicidal agent. Other agents include 0.5% silver nitrate, 95% ethyl alcohol, and cetrimide. * **Option A (Incorrect):** The **liver** is the most common site (approx. 75%), followed by the lungs (15%). The parasite enters the portal circulation from the intestine, making the liver the first "filter." * **Option B (Incorrect):** While Albendazole is used, the "treatment of choice" depends on the WHO classification (Gharbi’s). For large, symptomatic cysts, surgery or **PAIR** (Puncture, Aspiration, Injection, Re-aspiration) is preferred. Albendazole is typically started 1–4 weeks preoperatively and continued for 1–3 months postoperatively to reduce cyst pressure and prevent recurrence. ### **Clinical Pearls for NEET-PG** * **Diagnosis:** Ultrasound is the gold standard for screening and classification. Look for the **"Water-lily sign"** (detached endocyst) or **"Wheel-spoke appearance"** (daughter cysts). * **Casoni’s Test:** An immediate hypersensitivity skin test, now largely replaced by ELISA (high sensitivity) for serology. * **PAIR Contraindications:** Avoid PAIR in superficial cysts (risk of rupture), biliary communication, or inactive/calcified cysts (CE4/CE5). * **Complication:** The most dreaded complication of cyst rupture or spillage during surgery is **Anaphylactic shock**. Always keep hydrocortisone and adrenaline ready.

Q: Which of the following best describes dry socket?

Results from loss of the blood clot in the socket.. **Explanation:** **Dry Socket**, medically known as **Alveolar Osteitis**, is a painful dental complication following tooth extraction. **1. Why Option A is Correct:** The core pathophysiology involves the **premature lysis or loss of the blood clot** (fibrinolysis) that normally fills the extraction socket. This clot serves as a scaffold for new bone growth and protects the underlying bone and nerve endings. When the clot is lost, the alveolar bone is exposed to the oral environment, saliva, and bacteria, leading to severe, radiating pain typically starting 3–5 days post-extraction. **2. Why the Other Options are Incorrect:** * **Option B:** Treatment focuses on **palliative care**, not re-inducing bleeding. Re-curretting the socket to induce a new clot is generally contraindicated as it can spread infection and increase pain. Management involves gentle irrigation with saline and placing a sedative dressing (e.g., Zinc Oxide Eugenol). * **Option C:** It is a **localized inflammation** of the alveolar bone, not a true osteomyelitis (which involves marrow space infection and systemic symptoms). There is no suppuration or fever. * **Option D:** It is most common in the **mandibular third molars** (lower wisdom teeth), not anterior teeth, due to the higher density of bone and decreased vascularity in the posterior mandible. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most significant), oral contraceptives (estrogen increases fibrinolysis), traumatic extraction, and poor oral hygiene. * **Key Symptom:** Severe pain that is out of proportion to clinical signs, often associated with **halitosis** (foul odor). * **Prevention:** Prophylactic antibiotics (in high-risk cases) and avoiding straws or smoking post-surgery to prevent dislodging the clot.

Q: What is the most common tumor of the retroperitoneum?

Sarcoma. **Explanation:** The retroperitoneum is a complex anatomical space containing various mesenchymal, neural, and germ cell tissues. Among primary retroperitoneal tumors (PRTs), **Sarcomas** are the most common histological type, accounting for approximately **70-80%** of all primary malignant retroperitoneal masses in adults. **1. Why Sarcoma is correct:** Primary retroperitoneal tumors are predominantly malignant, and the majority arise from mesenchymal elements (fat, muscle, or connective tissue). The most frequent subtypes encountered are **Liposarcoma** (most common), followed by Leiomyosarcoma and Pleomorphic Undifferentiated Sarcoma. These tumors often present late because the retroperitoneal space is distensible, allowing them to reach a massive size before causing symptoms. **2. Why other options are incorrect:** * **Stroma:** While "stromal" refers to the connective tissue framework, it is a general histological term and not a specific tumor classification in this context (unlike GIST in the GI tract). * **Teratoma:** These are germ cell tumors. While they occur in the retroperitoneum (especially in infants and children), they are significantly less common than sarcomas in the adult population. * **Retro-teratoma:** This is not a standard medical classification for retroperitoneal tumors. **Clinical Pearls for NEET-PG:** * **Most common primary retroperitoneal tumor:** Sarcoma. * **Most common subtype of retroperitoneal sarcoma:** Liposarcoma. * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) scan (helps in assessing origin and vessel involvement). * **Treatment of choice:** Radical surgical resection with clear margins (R0 resection). These tumors are notoriously resistant to chemotherapy and radiotherapy. * **Rule of thumb:** 80% of primary retroperitoneal masses are malignant; of those, 80% are sarcomas.

Q: What is the most common complication of splenectomy?

Pulmonary complications. **Explanation:** **Pulmonary complications** are the most common overall complications following a splenectomy, occurring in approximately 15–30% of cases. The proximity of the spleen to the left diaphragm leads to postoperative diaphragmatic irritation, splinting, and shallow breathing. This results in a spectrum of issues, most commonly **left-sided basal atelectasis**, followed by pleural effusion and pneumonia. **Analysis of Options:** * **A. Pancreatic leak:** While the tail of the pancreas lies in the splenic hilum and can be injured during hilar dissection, it is a specific technical complication rather than the most common one. * **C. Pneumococcal peritonitis:** This is a manifestation of Overwhelming Post-Splenectomy Infection (OPSI). While OPSI is the most *feared* and lethal complication, its incidence is low (approx. 1–2%). * **D. Hemorrhage:** Postoperative bleeding (often from the short gastric arteries or splenic pedicle) is a serious early complication but occurs less frequently than pulmonary issues. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Atelectasis (Pulmonary). * **Most common cause of OPSI:** *Streptococcus pneumoniae* (followed by *H. influenzae* and *N. meningitidis*). * **Vaccination Protocol:** Ideally 2 weeks *before* elective surgery or 2 weeks *after* emergency surgery (to ensure optimal functional antibody response). * **Hematological finding:** Presence of **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on peripheral smear post-splenectomy. * **Post-splenectomy Sepsis:** Risk is highest in children and within the first 2 years post-surgery.

Q: Which scalpel blade is most commonly used for oral surgical procedures?

No. 15. **Explanation:** The **No. 15 blade** is the most frequently used scalpel blade in oral and maxillofacial surgery. Its design features a small, curved cutting edge that allows for precise, short-stroke incisions. This is ideal for the delicate anatomy of the oral cavity, such as performing sulcular incisions, reflecting mucoperiosteal flaps, and excising small intraoral lesions. **Analysis of Options:** * **No. 15 (Correct):** The "workhorse" of oral surgery. Its small size provides excellent maneuverability in the restricted space of the mouth. * **No. 11:** A pointed, triangular blade used primarily for **stab incisions**. In oral surgery, it is used for Incision and Drainage (I&D) of abscesses or for precise vascular punctures, but not for general flap surgery. * **No. 12:** A hawk-bill or crescent-shaped blade with a cutting edge on the inside of the curve. It is specifically used for **mucogingival procedures** or incisions at the maxillary tuberosity/retromolar pad area where access is difficult. * **No. 22:** A large, curved blade used with a No. 4 handle. It is designed for **large skin incisions** (e.g., laparotomy) and is far too bulky for intraoral use. **High-Yield Clinical Pearls for NEET-PG:** * **Handles:** Blades No. 10, 11, 12, and 15 fit the **No. 3 handle** (standard for fine surgery). * **No. 15C:** A thinner, longer version of the No. 15 blade, often preferred for periodontal plastic surgery and micro-surgical procedures. * **Bard-Parker Handle:** The most common scalpel handle used in surgical practice.

Question 1

A 35-year-old patient presents with features of septicemia, including hypotension and low urine output, and is being treated for colonic necrosis. What is the initial management approach?

Accepted Answer

Intravenous fluid resuscitation only.

Answer

Intravenous fluid resuscitation combined with dopamine infusion.

Answer

Dopamine infusion only.

Answer

High-dose antibiotics.

Question 2

What is the target maintenance level for mixed venous oxygen saturation in the management of shock?

Accepted Answer

50-70%

Answer

< 40%

Answer

40-50%

Answer

>70%

Question 3

Antibioma is best treated by?

Accepted Answer

Complete resection

Answer

Partial resection

Answer

Aspiration

Answer

Administration of antibiotics

Question 4

Which of the following is the most common type of splenic cyst?

Accepted Answer

Pseudocyst

Answer

Bacterial infection

Answer

Parasitic infection

Answer

Congenital anomaly

Question 5

Which of the following is TRUE?

Accepted Answer

Square (Reef) Knot - F; Surgeons Knot - D; Granny (Pseudo-square) Knot - A; Reverse cutting needle - E; Vertical Mattress - B; Purse String Suture - C

Answer

Square (Reef) Knot - D; Surgeons Knot - F; Granny (Pseudo-square) Knot - A; Reverse cutting needle - E; Vertical Mattress - B; Purse String Suture - C

Answer

Square (Reef) Knot - A; Surgeons Knot - D; Granny (Pseudo-square) Knot - F; Reverse cutting needle - E; Vertical Mattress - B; Purse String Suture - C

Answer

Square (Reef) Knot - F; Surgeons Knot - A; Granny (Pseudo-square) Knot - D; Reverse cutting needle - E; Vertical Mattress - B; Purse String Suture - C

Question 6

What is true about hydatid disease?

Accepted Answer

20% saline is scolicidal.

Answer

The most common site is the lung.

Answer

Preoperative albendazole followed by surgery is the treatment of choice.

Answer

All of the above.

Question 7

Which of the following best describes dry socket?

Accepted Answer

Results from loss of the blood clot in the socket.

Answer

Is treated by reintroducing bleeding into the socket.

Answer

Is a form of osteomyelitis.

Answer

Is common in the extraction of anterior teeth.

Question 8

What is the most common tumor of the retroperitoneum?

Accepted Answer

Sarcoma

Answer

Stroma

Answer

Teratoma

Answer

Retro-teratoma

Question 9

What is the most common complication of splenectomy?

Accepted Answer

Pulmonary complications

Answer

Pancreatic leak

Answer

Pneumococcal peritonitis

Answer

Hemorrhage

Question 10

Which scalpel blade is most commonly used for oral surgical procedures?

Accepted Answer

No. 15

Answer

No. 22

Answer

No. 12

Answer

No. 11

General Surgery Principles — MCQs

General Surgery Principles — MCQs

On this page

Practice by Chapter

Want unlimited practice?