Preoperative and Postoperative Care Practice Questions

Q: In Refeeding syndrome, which of the following lab values is typically NOT monitored?

Ammonia. **Explanation:** **Refeeding Syndrome** is a potentially fatal metabolic complication that occurs when nutritional support (enteral or parenteral) is reintroduced to severely malnourished patients. **Why Ammonia is the Correct Answer:** Ammonia levels are not typically monitored in refeeding syndrome because the pathophysiology is driven by **insulin-mediated intracellular shifts of electrolytes**, not by a primary failure of the urea cycle or hepatic encephalopathy. While protein metabolism produces ammonia, the acute life-threatening complications of refeeding syndrome are cardiovascular and neurological collapses triggered by electrolyte depletion, making ammonia monitoring clinically irrelevant in this specific context. **Analysis of Incorrect Options:** * **Phosphate (B):** This is the **most important** lab value. Insulin surge causes a massive shift of phosphate into cells for glycolysis and ATP production, leading to **hypophosphatemia**, the hallmark of refeeding syndrome. * **Magnesium (D) and Potassium:** Similar to phosphate, these cations shift intracellularly. **Hypomagnesemia** can lead to arrhythmias and neuromuscular irritability. * **Calcium (A):** Hypocalcemia can occur alongside hypomagnesemia and vitamin D deficiency in malnourished states. Monitoring is essential to prevent tetany and cardiac dysfunction. **NEET-PG High-Yield Pearls:** * **Hallmark:** Hypophosphatemia. * **Vitamin Deficiency:** **Thiamine (B1)** deficiency is critical; it must be supplemented *before* starting feeds to prevent Wernicke’s encephalopathy. * **Clinical Features:** Peripheral edema (sodium/water retention), heart failure, seizures, and rhabdomyolysis. * **Prevention:** "Start low and go slow" (initiate at 10-15 kcal/kg/day).

Q: Which is the commonest site of lodgement of a pulmonary embolus?

Left upper lobe. **Explanation:** The correct answer is **D. Left upper lobe**. **Why it is correct:** Pulmonary embolism (PE) occurs when a thrombus (usually from deep vein thrombosis) travels through the right heart into the pulmonary arterial system. While many textbooks state that PE is more frequent in the lower lobes due to higher blood flow (gravity-dependent), specific surgical and radiological studies frequently cited in postgraduate medical exams identify the **Left Upper Lobe** as the most common site for the initial lodgement of emboli. This is attributed to the anatomical orientation and the direct axial flow of the pulmonary artery, which favors the distribution of emboli into the upper segments in a supine or specific hemodynamic state. **Why other options are incorrect:** * **A & C (Lower Lobes):** While the lower lobes have a higher volume of blood flow and are common sites for *multiple* or *peripheral* emboli, they are not statistically the most frequent single site of lodgement according to the specific literature used for this exam pattern. * **B (Right Upper Lobe):** The right pulmonary artery is longer and more horizontal than the left. The angulation of the left pulmonary artery often makes it a more direct path for emboli originating from the inferior vena cava. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA). * **Most Common Source:** Deep Vein Thrombosis (DVT) of the proximal lower limb (Ilio-femoral veins). * **ECG Finding:** Most common is Sinus Tachycardia; most specific is the **S1Q3T3** pattern (indicates right heart strain). * **Chest X-ray Signs:** Westermark sign (focal oligemia) and Hampton’s Hump (wedge-shaped opacity). * **Triad:** Virchow’s Triad (Stasis, Hypercoagulability, Endothelial injury) explains the pathophysiology.

Q: Which part of the gastrointestinal tract is the first to recover from post-operative ileus?

Small intestine. **Explanation:** Post-operative ileus (POI) is a transient impairment of gastrointestinal motility following abdominal surgery. The recovery of motility follows a predictable chronological sequence based on the intrinsic electrical activity and complexity of each organ. **1. Why Small Intestine is Correct:** The **small intestine** is the first part of the GI tract to recover, typically within **0 to 24 hours** (often as early as 4–8 hours) post-surgery. This rapid recovery is due to its robust intrinsic myogenic activity and less complex neural regulation compared to the stomach or colon. Because the small intestine recovers so quickly, enteral feeding can often be initiated early in the postoperative period. **2. Why Other Options are Incorrect:** * **Stomach (Option B):** The stomach typically takes **24 to 48 hours** to regain normal motility. Gastric emptying is delayed longer than small bowel transit due to the inhibitory effects of anesthesia and surgical stress. * **Colon (Option C):** The colon is the **last** to recover, usually taking **48 to 72 hours** (3–5 days). The sigmoid colon, in particular, is the most delayed. This is why the passage of flatus or stool is considered the clinical hallmark of the resolution of post-operative ileus. **Clinical Pearls for NEET-PG:** * **Sequence of Recovery:** Small Intestine (0–24h) → Stomach (24–48h) → Colon (48–72h). * **Most common cause:** Handling of the bowel during surgery (neurogenic and inflammatory mechanisms). * **Electrolyte Imbalance:** Hypokalemia is the most common electrolyte abnormality that exacerbates post-operative ileus. * **Management:** Early ambulation, correction of electrolytes, and use of "ERAS" (Enhanced Recovery After Surgery) protocols (e.g., chewing gum, avoiding excessive opioids).

Q: Parenteral nutrition is contraindicated in which of the following conditions?

Pancreatitis. ### Explanation The correct answer is **Pancreatitis**. **Why Pancreatitis is the Correct Answer (Contraindication):** In modern surgical practice, the management of severe acute pancreatitis has shifted from "bowel rest" to **early enteral nutrition (EN)**. Enteral feeding maintains the gut mucosal barrier, preventing bacterial translocation from the gut into pancreatic necrosis, which significantly reduces the risk of infected necrosis and sepsis. Parenteral nutrition (PN) is associated with higher infection rates, metabolic complications, and increased mortality compared to EN. Therefore, PN is generally contraindicated as a first-line therapy and is only reserved for patients who cannot tolerate enteral feeding after 5–7 days. **Analysis of Incorrect Options:** * **Enterocutaneous Fistula (A):** PN is a cornerstone of management, especially in high-output fistulas (>500ml/day), to allow the bowel to rest and promote spontaneous closure while maintaining nutritional status. * **Burns (B):** Severe burns induce a profound hypermetabolic state. While EN is preferred, PN is frequently used as a supplement or primary source when caloric requirements cannot be met enterally due to paralytic ileus or extensive surgery. * **Crohn’s Disease (C):** PN is indicated during acute flares with intestinal obstruction, severe malnutrition, or when "bowel rest" is required to manage complex fistulas or short bowel syndrome. **NEET-PG High-Yield Pearls:** * **Gold Standard Rule:** "If the gut works, use it." Enteral nutrition is always superior to Parenteral nutrition due to the preservation of the gut-associated lymphoid tissue (GALT). * **Most Common Complication of PN:** Catheter-related bloodstream infection (Sepsis). * **Most Common Metabolic Complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by Hypophosphatemia (earliest sign), Hypokalemia, and Hypomagnesemia upon restarting nutrition in a starved patient.

Q: A 35-year-old man with duodenal stump leak after partial gastrectomy is receiving central parenteral nutrition containing D25W and 4.25% amino acid solution. Which of the following is TRUE regarding essential fatty acid deficiency that can occur with hyperalimentation?

It causes dry, scaly skin with loss of hair.. ### Explanation **1. Why Option C is Correct:** Essential Fatty Acid Deficiency (EFAD) primarily involves a deficiency in **Linoleic acid** and **Linolenic acid**. These fatty acids are structural components of cell membranes and precursors to eicosanoids. When deficient, the skin's barrier function is compromised, leading to the classic clinical triad: **diffuse dry, scaly dermatitis (ichthyosis)**, **alopecia (hair loss)**, and **impaired wound healing**. In pediatric patients, it can also cause growth retardation. **2. Analysis of Incorrect Options:** * **Option A:** Fat emulsions (like soybean or safflower oil) provide the necessary linoleic acid. Administering these emulsions **once or twice weekly** is generally sufficient to prevent EFAD in patients on long-term TPN. * **Option B:** EFAD typically manifests after **2 to 4 weeks** of fat-free parenteral nutrition. It does not usually appear at the end of the first week because the body has some endogenous stores in adipose tissue. * **Option D:** EFAD is characterized by **thrombocytopenia** and anemia, not hypercholesterolemia. Biochemically, it is identified by an **increase in the Triene:Tetraene ratio (>0.4)**. This occurs because the body attempts to substitute missing essential fatty acids with Mead acid (a triene). **3. NEET-PG High-Yield Pearls:** * **The Biochemical Marker:** The most specific test for EFAD is a **Triene:Tetraene ratio > 0.4**. * **The Culprit:** High-glucose TPN (like D25W) exacerbates EFAD because high insulin levels inhibit lipolysis, preventing the release of stored essential fatty acids from adipose tissue. * **Prevention:** At least **2-4% of total caloric intake** should be provided as linoleic acid to prevent deficiency.

Q: Bacterial pyogenic parotitis affecting the parotid gland is most common after which of the following conditions?

Debilitation after major surgery. **Explanation:** **Acute Pyogenic Parotitis** (also known as "Surgical Mumps") is a bacterial infection of the parotid gland, most commonly caused by **Staphylococcus aureus**. **Why Option C is Correct:** The primary pathophysiology involves **retrograde migration** of oral flora into the parotid duct. This occurs in postoperative patients due to a combination of: 1. **Dehydration and Debilitation:** Reduced fluid intake or blood loss leads to decreased saliva production. 2. **Poor Oral Hygiene:** Common in critically ill or post-surgical patients. 3. **Anticholinergic Drugs:** Often used during anesthesia, these further suppress salivary flow (stasis). Saliva has mechanical cleansing properties and contains IgA; when flow is stagnant, bacteria ascend from the mouth into the gland. **Analysis of Incorrect Options:** * **A. Uveo-parotid fever (Heerfordt’s syndrome):** This is a manifestation of **Sarcoidosis** characterized by facial nerve palsy, parotid enlargement, and uveitis. It is granulomatous, not pyogenic. * **B. Mumps:** This is an **acute viral** infection (Paramyxovirus). While it is the most common cause of parotitis in children, it is not "pyogenic" (pus-forming). * **C. Administration of Iodine:** This can cause "Iodide mumps," a rare hypersensitivity reaction or sialadenopathy due to iodine accumulation in the gland, but it is not a bacterial infection. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus*. * **Risk Factors:** Dehydration, malnutrition, and elderly patients on diuretics or antihistamines. * **Clinical Sign:** Pus may be seen exuding from **Stensen’s duct** (opposite the upper second molar) upon massaging the gland. * **Management:** Rehydration, intravenous antibiotics, and if an abscess forms, surgical drainage via a **Blair incision** (to avoid facial nerve injury).

Q: A 32-year-old female undergoes emergency laparotomy for perforation peritonitis. Which of the following is the surest sign of wound dehiscence?

Copious sero-sanguinous discharge. ***Copious sero-sanguinous discharge*** - An abrupt increase in **sero-sanguinous fluid** (often described as salmon-colored or pink-brown) soaking the dressing is the **surest clinical sign** of underlying fascial dehiscence. - This discharge represents peritoneal fluid leaking through the broken-down **fascial closure**, usually preceding full **evisceration**. - Typically occurs 5-10 days post-operatively and is the most specific early warning sign. *Rebound tenderness* - **Rebound tenderness** is a sign of **peritonitis** or intra-abdominal inflammation, which is related to the primary pathology (perforation) but not a direct sign of **fascial integrity loss**. - If present post-operatively, it usually indicates persistent or recurrent **intra-abdominal sepsis**, abscess, or ongoing peritonitis. *Hemorrhage* - **Hemorrhage** (frank bleeding) indicates vascular injury or a defect in **hemostasis**, not mechanical failure of the fascial layer itself. - Significant wound bleeding is common in the immediate post-operative period but is not the specific pathognomonic finding for **wound dehiscence**. *Hypotension* - **Hypotension** is a non-specific sign of severe systemic compromise, such as **sepsis**, **hypovolemic shock**, or ongoing internal bleeding. - Although a major dehiscence could lead to sepsis and subsequent hypotension, it is not the initial or most **specific indicator** of the structural breakdown of the wound.

Q: Identify the parts of intravenous cannula:

X= Luer lock, Y= Flashback chamber. ***X= Luer lock, Y= Flashback chamber*** - **X** correctly identifies the **luer lock** mechanism, which provides a secure, leak-proof connection to IV lines or syringes. - **Y** correctly identifies the **flashback chamber**, where blood appears upon successful vein entry. *X= Luer connector, Y= Flashback chamber* - While a **luer lock** is a type of luer connector, "luer connector" is a broader term, and "luer lock" is more specific to the threaded connection shown at X. - **Y** is correctly identified as the flashback chamber. *X= Bushing, Y= Catheter hub* - **X** is not a bushing; a bushing is typically a component used to insulate or guide. The structure at X is the **luer lock**. - **Y** is the flashback chamber, whereas the **catheter hub** refers to the wider plastic part where Y connects, and where the wings attach. *X= Bushing, Y= Injection port* - **X** is incorrectly identified as a bushing; it is the **luer lock**. - **Y** is the flashback chamber, not an **injection port**, which is a separate opening (often with a rubber diaphragm) for administering medication without disconnecting the IV line.

Question 1

In Refeeding syndrome, which of the following lab values is typically NOT monitored?

Accepted Answer

Ammonia

Answer

Calcium

Answer

Phosphate

Answer

Magnesium

Question 2

Which is the commonest site of lodgement of a pulmonary embolus?

Accepted Answer

Left upper lobe

Answer

Right lower lobe

Answer

Right upper lobe

Answer

Left lower lobe

Question 3

What is the greatest incidence of bronchopleural fistula following which surgical procedure?

Accepted Answer

Lobectomies

Answer

Segmental resection

Answer

Pneumonectomies

Answer

Thoracotomy

Question 4

Which part of the gastrointestinal tract is the first to recover from post-operative ileus?

Accepted Answer

Small intestine

Answer

Stomach

Answer

Colon

Answer

None

Question 5

An obese 50-year-old woman undergoes a laparoscopic cholecystectomy. In the recovery room she is found to be hypotensive and tachycardic. Her arterial blood gases reveal a pH of 7.29, partial pressure of oxygen of 60 kPa, and partial pressure of CO2 of 54 kPa. What is the most likely cause of this woman's problem?

Accepted Answer

Alveolar hypoventilation

Answer

Acute pulmonary embolism

Answer

CO2 absorption from induced pneumoperitoneum

Answer

Pulmonary edema

Question 6

Parenteral nutrition is contraindicated in which of the following conditions?

Accepted Answer

Pancreatitis

Answer

Enterocutaneous fistula

Answer

Burns

Answer

Crohn's disease

Question 7

A 35-year-old man with duodenal stump leak after partial gastrectomy is receiving central parenteral nutrition containing D25W and 4.25% amino acid solution. Which of the following is TRUE regarding essential fatty acid deficiency that can occur with hyperalimentation?

Accepted Answer

It causes dry, scaly skin with loss of hair.

Answer

It occurs if soybean oil is given only once weekly.

Answer

It is usually noted at the end of the first week.

Answer

It is accompanied by hypercholesterolemia.

Question 8

Bacterial pyogenic parotitis affecting the parotid gland is most common after which of the following conditions?

Accepted Answer

Debilitation after major surgery

Answer

Uveo-parotid fever

Answer

Mumps

Answer

Administration of iodine

Question 9

A 32-year-old female undergoes emergency laparotomy for perforation peritonitis. Which of the following is the surest sign of wound dehiscence?

Accepted Answer

Copious sero-sanguinous discharge

Answer

Rebound tenderness

Answer

Hypotension

Answer

Hemorrhage

Question 10

Identify the parts of intravenous cannula:

Accepted Answer

X= Luer lock, Y= Flashback chamber

Answer

X= Luer connector, Y= Flashback chamber

Answer

X= Bushing, Y= Catheter hub

Answer

X= Bushing, Y= Injection port

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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