Preoperative and Postoperative Care Practice Questions

Q: A 72-year-old man undergoes elective total knee replacement. On postoperative day 2, he develops acute onset of dyspnea, chest pain, and hypoxemia. His D-dimer is elevated at 2,500 ng/mL (normal <500). CT pulmonary angiogram shows multiple pulmonary emboli. What is the most important factor that contributed to this complication?

Combination of surgery, immobilization, and age. ***Combination of surgery, immobilization, and age*** - This scenario exemplifies **Virchow's triad**, where **venous stasis** (postoperative immobilization), **endothelial injury** (surgery), and a **hypercoagulable state** (surgery, inflammation, advanced age) together significantly elevate the risk of deep vein thrombosis (DVT) and subsequent pulmonary embolism (PE). - A 72-year-old patient undergoing a major orthopedic surgery like total knee replacement has multiple inherent risk factors converging, making the combined effect the most important contributing factor rather than a single isolated element. *Inadequate postoperative mobilization* - While inadequate mobilization contributes to **venous stasis**, it represents only one component of the multifactorial risk for PE in this patient. - Mobilization is crucial, but it does not address the hypercoagulable state or endothelial injury inherent to surgery and age. *Prolonged immobilization during surgery* - This factor primarily contributes to **venous stasis** in the lower extremities, increasing the risk of thrombus formation. - However, it does not account for the additional pro-thrombotic effects of **surgical trauma** and the patient's advanced age, which also contribute significantly to the hypercoagulable state and endothelial damage. *Failure to use compression stockings* - Compression stockings help prevent venous stasis by **improving venous return** and reducing venous dilation. - While beneficial, their absence is a contributing factor to venous stasis, but not as comprehensive as the combination of surgical trauma, immobilization, and age in driving the overall risk.

Q: A 65-year-old diabetic woman develops a surgical site infection 5 days after elective cholecystectomy. She has poorly controlled diabetes (HbA1c 10.2%), is obese (BMI 35), and was on chronic steroids for rheumatoid arthritis. Which factor most likely contributed to her delayed wound healing?

Hyperglycemia impairing neutrophil function. ***Hyperglycemia impairing neutrophil function*** - **Poorly controlled diabetes** leads to hyperglycemia, which significantly impairs **neutrophil chemotaxis**, phagocytosis, and bacterial killing. - This compromised immune response directly increases the risk of **surgical site infections** and delayed wound healing by reducing the body's ability to clear pathogens. - With an **HbA1c of 10.2%**, this patient has severe chronic hyperglycemia, making this the most direct and significant contributor to the acute SSI. *Steroid use preventing inflammation* - **Chronic steroid use suppresses the immune system** and **impairs collagen synthesis**, which are indeed risk factors for delayed wound healing. - However, in this specific scenario, the impact of severe hyperglycemia on acute immune function (neutrophil impairment) is a more *direct* and *most likely* contributor to the *surgical site infection* within 5 days, rather than the chronic effects of steroids. *Advanced age alone* - While **advanced age** can be associated with some delay in wound healing due to reduced cellular regeneration and vascularity, it is typically a less potent factor than severe systemic metabolic disorders like **uncontrolled diabetes**. - Compared to the profound immune dysfunction caused by hyperglycemia, age alone is not the *most likely* primary contributor to this acute infection. *Obesity causing mechanical stress* - **Obesity** contributes to increased surgical complexity, poor vascularization in adipose tissue, and higher rates of **wound dehiscence** and infection due to increased skin tension and impaired drug penetration. - While it is a significant risk factor, the **acute impairment of bacterial clearance** due to hyperglycemia is a more direct and immediate cause of the *infection* itself, rather than just delayed healing or dehiscence from mechanical stress.

Q: The image shows a Negative Pressure Wound Therapy (NPWT) dressing applied to a patient's wound. What is the ideal negative pressure range commonly used for NPWT to promote wound healing?

-125 mm Hg. ***-125 mm Hg*** - **Negative Pressure Wound Therapy (NPWT)** uses controlled subatmospheric (negative) pressure to promote wound healing. - The most commonly used pressure setting is **-125 mm Hg**, which has been extensively validated in clinical studies. - This pressure level effectively promotes granulation tissue formation, reduces edema, removes exudate, and increases blood flow to the wound bed. - **-75 to -125 mm Hg** is the typical therapeutic range, with -125 mm Hg being the standard setting for most wound types. *60-80 mm Hg* - This represents **positive pressure**, not negative pressure used in NPWT. - NPWT requires subatmospheric (below atmospheric) pressure, denoted by the negative sign. - Positive pressures in this range would be used in compression therapy for venous insufficiency, not vacuum-assisted wound closure. *130 mm Hg* - This is a **positive pressure** value and does not apply to NPWT. - NPWT uses negative (suction) pressure, not positive compression. - If interpreted as -130 mm Hg, this would be at the higher end and might increase patient discomfort without additional benefit over -125 mm Hg. *80-100 mm Hg* - These are **positive pressure** values not used in NPWT. - NPWT specifically requires negative pressure (vacuum/suction) to work effectively. - This range would be excessively high even for compression therapy and inappropriate for NPWT.

Q: A child who underwent a tonsillectomy started bleeding while lying in the ward post-operatively. Which of the following is the most appropriate management step?

Take to OT, remove the clot & re-ligation. ***Take to OT, remove the clot & re-ligation*** - **Post-tonsillectomy bleeding** is a surgical emergency requiring immediate intervention to prevent airway compromise and significant blood loss. - The most definitive management involves returning to the **operating theatre** for direct visualization, removal of any obstructing clots, and **re-ligation** of the bleeding vessel. *Conservative management* - **Conservative management** is generally insufficient for significant post-tonsillectomy bleeding, as it does not address the source of hemorrhage and can lead to severe complications. - While minor oozing might be observed, active bleeding often indicates a larger vessel injury that requires **surgical hemostasis**. *Take to OT & pressure packing* - While **pressure packing** can temporarily slow bleeding, it is not a definitive long-term solution as it does not directly identify and treat the bleeding vessel. - Furthermore, pharyngeal packing in a child carries a risk of **airway obstruction** and aspiration, making it less suitable than direct re-ligation. *Cautery* - **Cautery** is a method of hemostasis, but it is typically performed in the operating theatre under direct vision, often after clot removal. - It is not a stand-alone initial management step in the ward for active bleeding without proper surgical assessment and preparation.

Q: Which of the following is a common topical use of the medicine shown in the image?

Post-adenoidectomy to control bleeding. ***Post-adenoidectomy to control bleeding*** - The image shows **Neo-Synephrine (phenylephrine)**, a potent **alpha-adrenergic agonist** that causes **vasoconstriction**. - Its vasoconstrictive properties make it useful topically to reduce **bleeding** during and after surgical procedures like **adenoidectomy**. *Rhino cerebral mucormycosis* - This is a serious fungal infection requiring systemic antifungal therapy, often **amphotericin B**. Topical phenylephrine has no role in treating the infection itself. - While bleeding might be a symptom of mucormycosis, phenylephrine would only offer temporary symptomatic relief, not address the underlying fungal pathology. *Inlay type I myringoplasty* - Myringoplasty is a surgical procedure to repair a perforated eardrum. Topical phenylephrine is not indicated for this procedure. - The primary goal of this surgery is to reconstruct the **tympanic membrane**, and phenylephrine would not contribute to tissue healing or graft integration. *Subglottic stenosis* - This condition involves narrowing of the airway below the vocal cords, often requiring surgical intervention or corticosteroids. - Phenylephrine is a decongestant and vasoconstrictor, and as such, it does not have a therapeutic role in resolving the **fibrotic narrowing** characteristic of subglottic stenosis.

Q: What is the baseline platelet count required for surgery?

50,000/µL (50 × 10^9/L). ***50,000/µL (50 × 10^9/L)*** - A platelet count of **50,000/µL** is considered the **minimum threshold** for safe surgical procedures. - This level is generally sufficient to achieve **adequate primary hemostasis** and minimize the risk of significant perioperative bleeding. *20,000/µL (20 × 10^9/L)* - A platelet count of **20,000/µL** is generally **too low** for most surgical interventions, as it significantly increases the risk of serious bleeding. - This level is often associated with a risk of **spontaneous bleeding**, particularly in mucous membranes. *40,000/µL (40 × 10^9/L)* - While closer to the safe threshold, a platelet count of **40,000/µL** might still be considered **suboptimal** for major surgeries, especially those with a high risk of blood loss. - Some surgeons and anesthesiologists may prefer a slightly higher count to ensure a wider **safety margin**. *30,000/µL (30 × 10^9/L)* - A platelet count of **30,000/µL** is generally **insufficient** for most surgical procedures and would likely necessitate **platelet transfusion** preoperatively. - Patients at this level are at an **increased risk of bleeding** during and after surgery.

Q: After laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?

0.5-1 ml/kg/hr. ***0.5-1 ml/kg/hr*** - The standard acceptable urine output for a postoperative patient with normal renal function is **0.5-1 ml/kg/hr** (some sources extend this to 0.5-1.5 ml/kg/hr). - A minimum of **0.5 ml/kg/hr** is considered adequate renal perfusion and function, while outputs up to 1-1.5 ml/kg/hr indicate excellent hydration and renal function. - This weight-adjusted measure is the gold standard for assessing postoperative urine output and renal function. *0.5 ml/min* - This is an absolute rate (not weight-adjusted) and is inadequate as a general measure. - For a 70 kg patient, this would be only 0.43 ml/kg/hr, which is below the minimum acceptable threshold. *0.1 CC/hr* - This rate is **severely low** and indicates **oliguria** or **anuria**. - This suggests **acute kidney injury**, severe dehydration, or inadequate renal perfusion requiring immediate intervention. *1 ml/kg/hr* - While this value falls within the acceptable range, it represents only a single point rather than the **standard range of 0.5-1 ml/kg/hr**. - The range option is more comprehensive and represents the full spectrum of normal postoperative urine output.

Question 1

A 60-year-old man with a history of smoking presents with a 4 cm lung mass on chest CT. Bronchoscopy with biopsy shows squamous cell carcinoma. PET scan shows uptake in the primary tumor and ipsilateral hilar lymph nodes but no distant metastases. What is the most important factor in determining surgical candidacy?

Accepted Answer

Pulmonary function tests and cardiac evaluation

Answer

Presence of hilar lymph nodes

Answer

Size of the primary tumor

Answer

Smoking history

Question 2

A 72-year-old man undergoes elective total knee replacement. On postoperative day 2, he develops acute onset of dyspnea, chest pain, and hypoxemia. His D-dimer is elevated at 2,500 ng/mL (normal <500). CT pulmonary angiogram shows multiple pulmonary emboli. What is the most important factor that contributed to this complication?

Accepted Answer

Combination of surgery, immobilization, and age

Answer

Inadequate postoperative mobilization

Answer

Prolonged immobilization during surgery

Answer

Failure to use compression stockings

Question 3

A 70-year-old man with severe aortic stenosis requires emergency cholecystectomy for acute cholecystitis. His ejection fraction is 35%, and he has a history of recent myocardial infarction 4 weeks ago. Echocardiogram shows an aortic valve area of 0.8 cm² (normal >2.0). What is the most appropriate perioperative management strategy?

Accepted Answer

Perform percutaneous cholecystostomy first, then optimize cardiac status

Answer

Delay surgery for 3 months to allow cardiac recovery

Answer

Proceed with surgery using general anesthesia and careful monitoring

Answer

Cancel surgery and treat with antibiotics alone

Question 4

A 65-year-old diabetic woman develops a surgical site infection 5 days after elective cholecystectomy. She has poorly controlled diabetes (HbA1c 10.2%), is obese (BMI 35), and was on chronic steroids for rheumatoid arthritis. Which factor most likely contributed to her delayed wound healing?

Accepted Answer

Hyperglycemia impairing neutrophil function

Answer

Steroid use preventing inflammation

Answer

Advanced age alone

Answer

Obesity causing mechanical stress

Question 5

A 72-year-old man with severe coronary artery disease, ejection fraction 25%, and recent MI 6 weeks ago presents with acute cholangitis (Charcot's triad). Blood cultures grow E. coli, and ERCP shows choledocholithiasis with biliary obstruction. His surgical risk is prohibitive. Evaluate the best management strategy that balances infection control, biliary drainage, and cardiac risk.

Accepted Answer

ERCP with biliary stent placement and indefinite medical management

Answer

Emergency cholecystectomy with common bile duct exploration

Answer

Percutaneous transhepatic biliary drainage followed by staged procedures

Answer

ERCP with sphincterotomy and stone extraction followed by elective cholecystectomy

Question 6

The image shows a Negative Pressure Wound Therapy (NPWT) dressing applied to a patient's wound. What is the ideal negative pressure range commonly used for NPWT to promote wound healing?

Accepted Answer

-125 mm Hg

Answer

60-80 mm Hg

Answer

130 mm Hg

Answer

80-100 mm Hg

Question 7

A child who underwent a tonsillectomy started bleeding while lying in the ward post-operatively. Which of the following is the most appropriate management step?

Accepted Answer

Take to OT, remove the clot & re-ligation

Answer

Conservative management

Answer

Take to OT & pressure packing

Answer

Cautery

Question 8

Which of the following is a common topical use of the medicine shown in the image?

Accepted Answer

Post-adenoidectomy to control bleeding

Answer

Rhino cerebral mucormycosis

Answer

Inlay type I myringoplasty

Answer

Subglottic stenosis

Question 9

What is the baseline platelet count required for surgery?

Accepted Answer

50,000/µL (50 × 10^9/L)

Answer

40,000/µL (40 × 10^9/L)

Answer

20,000/µL (20 × 10^9/L)

Answer

30,000/µL (30 × 10^9/L)

Question 10

After laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?

Accepted Answer

0.5-1 ml/kg/hr

Answer

0.5 ml/min

Answer

0.1 CC/hr

Answer

1 ml/kg/hr

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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