Preoperative and Postoperative Care — MCQs
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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?
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?
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?
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?
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.
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?
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?
Which of the following is a common topical use of the medicine shown in the image?
What is the baseline platelet count required for surgery?
After laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?
Preoperative and Postoperative Care Indian Medical PG Practice Questions and MCQs
Question 181: 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?
- A. Pulmonary function tests and cardiac evaluation (Correct Answer)
- B. Presence of hilar lymph nodes
- C. Size of the primary tumor
- D. Smoking history
Explanation: ***Pulmonary function tests and cardiac evaluation*** - **Surgical lung resection** requires adequate **post-operative lung function** and **cardiovascular reserve** to tolerate the procedure and recovery. - These assessments help determine if the patient can endure the physiological stress of surgery and if enough healthy lung tissue will remain. *Presence of hilar lymph nodes* - While **ipsilateral hilar lymph node involvement (N1)** is an important **staging factor** determining prognosis, it does not, by itself, preclude surgical candidacy if the patient's physiological status is adequate. - The presence of N1 disease indicates a more advanced tumor but is often still amenable to surgical resection with potential curative intent. *Size of the primary tumor* - The **4 cm tumor size (T2a)** is an important component of **tumor staging** but does not independently determine **surgical candidacy**; larger tumors are often resectable if the patient can tolerate surgery. - Surgical resectability is more critically limited by the tumor's **local invasion** and the patient's functional status, rather than just its size. *Smoking history* - A history of **smoking** significantly increases the risk of lung cancer and other comorbidities but is not a direct contraindication to surgery if the patient's current organ function is sufficient. - Pulmonary function tests and cardiac evaluation would capture the physiological impact of smoking-related damage, which is the direct determinant of surgical risk. *Histological type of cancer* - **Squamous cell carcinoma** is a common type of non-small cell lung cancer that is often treated with surgery when resectable; the specific histology itself does not unilaterally contraindicate surgery. - While some histologies (e.g., small cell lung cancer) are less frequently treated with primary surgery, the **resectability** and **patient fitness** are paramount in squamous cell carcinoma.
Question 182: 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?
- A. Inadequate postoperative mobilization
- B. Prolonged immobilization during surgery
- C. Combination of surgery, immobilization, and age (Correct Answer)
- D. Failure to use compression stockings
Explanation: ***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.
Question 183: 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?
- A. Delay surgery for 3 months to allow cardiac recovery
- B. Perform percutaneous cholecystostomy first, then optimize cardiac status (Correct Answer)
- C. Proceed with surgery using general anesthesia and careful monitoring
- D. Cancel surgery and treat with antibiotics alone
Explanation: ***Perform percutaneous cholecystostomy first, then optimize cardiac status*** - This patient has **severe aortic stenosis**, a **recent myocardial infarction (within 4 weeks)**, and a **low ejection fraction (35%)**, placing him at extremely high risk for perioperative cardiac events. - A **percutaneous cholecystostomy** offers a less invasive, temporary solution to address the acute cholecystitis (draining the gallbladder) while allowing time to optimize his cardiac status or potentially perform an aortic valve intervention before definitive cholecystectomy. *Delay surgery for 3 months to allow cardiac recovery* - While delaying surgery to allow for cardiac recovery is generally a good strategy after an MI, **acute cholecystitis is an emergency condition** that requires prompt intervention and cannot be delayed for 3 months due to the risk of perforation, sepsis, and death. - This option does not address the immediate, life-threatening nature of the acute cholecystitis. *Proceed with surgery using general anesthesia and careful monitoring* - Proceeding directly to surgery with such **severe cardiac risk factors** (severe aortic stenosis, recent MI, low EF) carries a very high risk of perioperative myocardial infarction, heart failure, and death, even with careful monitoring. - The benefits of immediate definitive surgery do not outweigh the significant risks given the available less invasive options. *Cancel surgery and treat with antibiotics alone* - While antibiotics are part of the treatment for acute cholecystitis, **antibiotics alone are often insufficient** for definitive management, especially in severe cases, and can lead to progression to empyema, gangrene, or perforation of the gallbladder. - This approach carries a high risk of treatment failure and severe complications, as **source control** (drainage or removal of the inflamed gallbladder) is crucial.
Question 184: 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?
- A. Steroid use preventing inflammation
- B. Advanced age alone
- C. Hyperglycemia impairing neutrophil function (Correct Answer)
- D. Obesity causing mechanical stress
Explanation: ***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.
Question 185: 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.
- A. ERCP with biliary stent placement and indefinite medical management (Correct Answer)
- B. Emergency cholecystectomy with common bile duct exploration
- C. Percutaneous transhepatic biliary drainage followed by staged procedures
- D. ERCP with sphincterotomy and stone extraction followed by elective cholecystectomy
Explanation: ***ERCP with biliary stent placement and indefinite medical management*** - This approach offers immediate **biliary decompression** and infection control without the high surgical risks associated with cholecystectomy in a patient with severe **cardiac comorbidities** and recent **MI**. - **Biliary stenting** provides effective short-term and potentially long-term drainage, allowing the patient to avoid surgery given their prohibitive surgical risk. - In patients who are not surgical candidates, indefinite stenting is an acceptable definitive management strategy. *Emergency cholecystectomy with common bile duct exploration* - This is contraindicated due to the patient's severe **cardiac disease**, **low ejection fraction (25%)**, and recent **myocardial infarction** (6 weeks ago), which make the surgical risk prohibitive. - The patient is still within the high-risk period following MI, making any major surgery extremely dangerous with significantly elevated perioperative mortality. *Percutaneous transhepatic biliary drainage followed by staged procedures* - While PTBD can provide effective drainage, it is generally considered a second-line option to **ERCP** for biliary decompression in cases of **choledocholithiasis** with cholangitis. - PTBD carries its own risks and is typically reserved for cases where ERCP fails or is not technically feasible. *ERCP with sphincterotomy and stone extraction followed by elective cholecystectomy* - **ERCP with sphincterotomy and stone extraction** effectively addresses the immediate **choledocholithiasis** and provides biliary drainage. - However, the subsequent elective **cholecystectomy** would still pose prohibitive risk that this patient cannot tolerate given his severe **cardiac impairment** (EF 25%) and recent **MI**. - The risk of recurrent cholecystitis must be weighed against the high perioperative mortality risk in this patient.
Question 186: 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?
- A. -125 mm Hg (Correct Answer)
- B. 60-80 mm Hg
- C. 130 mm Hg
- D. 80-100 mm Hg
Explanation: ***-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.
Question 187: 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?
- A. Take to OT, remove the clot & re-ligation (Correct Answer)
- B. Conservative management
- C. Take to OT & pressure packing
- D. Cautery
Explanation: ***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.
Question 188: Which of the following is a common topical use of the medicine shown in the image?
- A. Rhino cerebral mucormycosis
- B. Inlay type I myringoplasty
- C. Post-adenoidectomy to control bleeding (Correct Answer)
- D. Subglottic stenosis
Explanation: ***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.
Question 189: What is the baseline platelet count required for surgery?
- A. 50,000/µL (50 × 10^9/L) (Correct Answer)
- B. 40,000/µL (40 × 10^9/L)
- C. 20,000/µL (20 × 10^9/L)
- D. 30,000/µL (30 × 10^9/L)
Explanation: ***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.
Question 190: After laparoscopic cholecystectomy what should be the urine output of the patient if the renal function of the patient is normal?
- A. 0.5 ml/min
- B. 0.1 CC/hr
- C. 1 ml/kg/hr
- D. 0.5-1 ml/kg/hr (Correct Answer)
Explanation: ***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.
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Preoperative Risk Assessment
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Perioperative Management of Comorbidities
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Preparation of Patient for Surgery
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Informed Consent Process
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Post-Anesthesia Care
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Pain Management
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Wound Care and Dressings
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Drain Management
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Postoperative Complications Detection
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Early Ambulation and Rehabilitation
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Enhanced Recovery After Surgery (ERAS) Protocols
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Discharge Planning and Follow-up
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