Preoperative and Postoperative Care Practice Questions

Q: On which postoperative day is burst abdomen most commonly observed?

7th postoperative day. ***7th postoperative day*** - **Burst abdomen**, also known as **dehiscence**, typically occurs when the wound healing process is disrupted, predominantly around the **7th to 10th postoperative day**. - This timing correlates with the period when tissue strength relies on **collagen synthesis**, which can be compromised by various factors like infection or poor nutrition before new collagen sufficiently remodels the wound. *2nd postoperative day* - This is generally too early for a **burst abdomen** to manifest as the initial inflammatory phase of wound healing is still ongoing, and significant collagen weakening has not yet occurred. - Complications this early are more often related to immediate surgical technique or severe **hematoma** formation. *9th postoperative day* - While possible, the **9th postoperative day** is slightly less common than the 7th, which is widely recognized as the peak incidence due to the specific timeline of collagen synthesis and degradation. - However, the underlying factors leading to dehiscence persist, so it could still occur around this time. *3rd postoperative day* - Similar to the 2nd postoperative day, the **3rd postoperative day** is too premature for a typical **burst abdomen** to develop. - At this stage, surgical wounds are primarily held together by sutures and initial fibrin plugs, with minimal contribution from newly synthesized collagen.

Q: What is the purpose of pneumatic compression stockings?

Prevention of deep vein thrombosis (DVT). ***Prevention of deep vein thrombosis (DVT)*** - Pneumatic compression stockings work by **mechanically compressing** the legs, promoting venous return and preventing blood stasis in the deep veins. - This increased blood flow reduces the risk of **clot formation**, which is crucial in DVT prevention, especially in immobile patients. *Prevention of hypothermia* - While stockings might offer a minimal amount of insulation, their primary design and mechanism of action are **not aimed at regulating body temperature**. - **Other methods** like warming blankets or forced-air warmers are used for the effective prevention of hypothermia. *Management of varicose veins* - **Graduated compression stockings** (not pneumatic) are used for the management of varicose veins by providing constant external pressure. - Pneumatic compression stockings apply **intermittent pressure**, which is not ideal for the continuous support required for varicose vein management. *Treatment of cellulitis* - Cellulitis is a **bacterial infection** of the skin and subcutaneous tissue, requiring antibiotic treatment. - Compression stockings are generally **contraindicated** in acute cellulitis as they can worsen inflammation and impede circulation.

Q: Patient can safely undergo major lung resection without an increased risk of postoperative complications if:

FEV1 > 2L, Normal DLCO. ***FEV1 > 2L, Normal DLCO*** - A **forced expiratory volume in 1 second (FEV1)** greater than 2 liters indicates **good baseline pulmonary function**, suggesting the patient can tolerate a significant reduction in lung tissue. - A **normal diffusing capacity of the lung for carbon monoxide (DLCO)** implies preserved alveolar-capillary membrane function and adequate gas exchange, which are crucial for maintaining oxygenation post-resection. *FEV1 > 1L, Normal DLCO* - While a normal DLCO is favorable, an **FEV1 only marginally above 1 liter** may still indicate some degree of airflow obstruction or reduced lung capacity. - This level of FEV1, although acceptable for some procedures, may not be sufficient to consider a major lung resection **safely without increased risk** due to the potential for significant postoperative respiratory compromise. *FEV1 > 1L, Decreased DLCO* - A **decreased DLCO** indicates impaired gas exchange, even if the FEV1 is somewhat preserved, suggesting underlying parenchymal lung disease or pulmonary vascular issues. - This combination significantly **increases the risk of postoperative complications** such as hypoxemia and pulmonary hypertension, making major lung resection unsafe. *FEV1 > 2L, Decreased DLCO* - Although an **FEV1 greater than 2 liters** is generally a good indicator of ventilatory capacity, a **decreased DLCO** still points to impaired gas exchange. - The presence of **impaired DLCO** suggests a higher risk of postoperative pulmonary complications, particularly respiratory failure and hypoxemia, even with good FEV1.

Q: Which of the following is the preferred cannulation site for total parenteral nutrition?

Subclavian vein. ***Subclavian vein*** - The **subclavian vein** is the preferred site for total parenteral nutrition (TPN) due to its **high blood flow**, which helps to rapidly dilute the hyperosmolar TPN solution, reducing the risk of thrombophlebitis. - Its relatively stable anatomical position also allows for long-term catheter placement with a **lower risk of dislodgement and infection**. *Great Saphenous vein* - The **great saphenous vein** is a peripheral vein with a **smaller diameter** and **lower blood flow** compared to central veins. - It is unsuitable for TPN due to the high risk of **thrombophlebitis** and **catheter-related infections** from the hyperosmolar solution. *Median cubital vein* - The **median cubital vein** is a peripheral vein commonly used for routine intravenous access but is not suitable for TPN. - Its **smaller caliber** and **peripheral location** would lead to a high incidence of phlebitis and pain with the continuous infusion of highly concentrated TPN solutions. *External jugular vein* - While the **external jugular vein** is a central vein, it is generally considered **less desirable** for long-term TPN compared to the subclavian vein. - Catheter placement in the external jugular vein can be associated with a **higher risk of patient discomfort** and potential for **catheter dislodgement** due to neck movement.

Q: Which pre-operative investigation is recommended before surgical procedures in a patient on warfarin therapy?

International Normalized Ratio (INR). ***International Normalized Ratio (INR)*** - The **INR** is specifically used to monitor the effectiveness of **warfarin** therapy, as it standardizes the prothrombin time (PT) for variations in thromboplastin reagents. - Before surgery, an INR measurement helps assess the patient's **coagulation status** and guides decisions on temporary cessation or bridging therapy to minimize bleeding risk. *Partial Thromboplastin Time (PTT)* - **PTT** primarily measures the **intrinsic and common pathways** of coagulation and is used to monitor **heparin** therapy, not warfarin. - While prolonged in some bleeding disorders, it is not the standard test for assessing warfarin's anticoagulant effect. *Clotting Time* - **Clotting time** is a very general and less precise measure of overall coagulation that is **rarely used** in modern clinical practice due to its low sensitivity and specificity. - It does not offer sufficient detail or standardization to guide pre-operative management for patients on warfarin. *Differential Count* - A **differential count** measures the different types of **white blood cells** within a blood sample and is used to diagnose infections, inflammatory conditions, or hematologic disorders. - It provides no information about a patient's coagulation status or the effects of anticoagulant medications like warfarin.

Q: Post-operative pulmonary thromboembolism is seen in all, except:

Tall and thin man. ***Tall and thin man*** - A **tall and thin man** is generally at a lower risk for developing post-operative pulmonary thromboembolism compared to the other options. - While prolonged immobility post-surgery can increase risk for anyone, factors like **obesity**, **pregnancy**, and **estrogen therapy** significantly elevate the risk. *Obese male* - **Obesity** is a major risk factor for venous thromboembolism (VTE) due to factors like increased venous stasis and chronic inflammation. - Adipose tissue also produces prothrombotic factors, further increasing the risk of **pulmonary embolism (PE)**. *Pregnant female* - **Pregnancy** induces a hypercoagulable state to prevent excessive bleeding during childbirth, increasing the risk of VTE. - This risk is further elevated in the post-partum period and with surgical procedures like a **Cesarean section**. *Estrogen therapy* - **Estrogen therapy**, such as in oral contraceptives or hormone replacement therapy, can increase the synthesis of clotting factors and decrease natural anticoagulant proteins. - This prothrombotic effect significantly raises the risk of **deep vein thrombosis (DVT)** and subsequent **PE**.

Q: What is the cardiac risk associated with breast surgery?

< 1%. ***< 1%*** - Breast surgery is generally considered a **low-risk procedure** regarding cardiac complications. - The incidence of major adverse cardiac events (MACE) is typically very low, often reported as **less than 1%**. *1 - 5 %* - This risk range is usually associated with **intermediate-risk surgical procedures**, such as carotid endarterectomy or peripheral vascular surgery, which involve higher cardiac stress. - Breast surgery does not typically fall into this category due to its less extensive physiological impact. *5 - 10 %* - This elevated risk percentage is characteristic of **high-risk surgeries**, including major vascular procedures (e.g., aortic aneurysm repair) or organ transplantation. - Such procedures involve significant fluid shifts, blood loss, and prolonged anesthesia, increasing cardiac strain. *> 10 %* - A cardiac risk exceeding 10% is extremely high and would generally be seen only in patients with **severe pre-existing cardiac disease** undergoing emergency major surgery, or in complex, extremely high-risk procedures. - Breast surgery typically does not pose such a profound cardiac risk.

Q: In a post-operative patient, 21 years old with a weight of 70 kg, what is the expected increase in hematocrit after transfusion of 1 unit of packed RBC?

3-5%. ***3-5%*** - A general rule of thumb is that one unit of **packed red blood cells (PRBCs)** will typically raise the **hematocrit** by 3-5% (or the hemoglobin by 1 g/dL) in a 70 kg adult. - This patient, being 21 years old and 70 kg, fits the standard adult profile for which this estimation holds true. *1%* - An increase of only 1% in hematocrit after one unit of PRBCs is typically too low and would suggest either **ongoing hemorrhage**, a technical error, or rapid destruction of transfused red blood cells. - This magnitude of increase is not the expected therapeutic effect for a single unit in a stable adult. *10%* - A 10% increase in hematocrit after one unit of PRBCs is generally higher than expected, indicating a more significant response. - While possible in some specific clinical scenarios, it is not the standard or average expected increase. *15%* - A 15% increase in hematocrit is a very substantial rise, far exceeding the typical response to a single unit of PRBCs. - Such an increase would usually require multiple units of blood or be indicative of an erroneous measurement.

Q: Which of the following is the best way of preventing the development of deep vein thrombosis (DVT) in the postoperative period?

Prophylactic heparin. ***Prophylactic heparin*** - **Prophylactic heparin** (either unfractionated or low molecular weight heparin) is a highly effective pharmacological intervention that directly prevents thrombus formation by inhibiting clotting factors. - It is particularly crucial for patients undergoing surgery, as the **hypercoagulable state** induced by surgery significantly increases DVT risk. *Early ambulation* - **Early ambulation** helps prevent DVT by promoting blood flow and reducing venous stasis, but it is often insufficient on its own for high-risk surgical patients. - It may be difficult or contraindicated immediately post-surgery depending on the type of procedure and patient's condition. *Physiotherapy* - **Physiotherapy**, including leg exercises and mobilization, can improve circulation and muscle pump function, which helps reduce venous stasis. - However, similar to early ambulation, it is generally considered an adjunct and not the primary method for preventing DVT in high-risk postoperative settings. *Low dose aspirin* - **Low-dose aspirin** has antiplatelet effects, which can reduce the risk of arterial thrombosis and, to a lesser extent, venous thrombosis, particularly in prolonged risk scenarios. - For acute high-risk postoperative DVT prevention, its efficacy is generally considered inferior to that of anticoagulants like heparin.

Question 1

On which postoperative day is burst abdomen most commonly observed?

Accepted Answer

7th postoperative day

Answer

2nd postoperative day

Answer

9th postoperative day

Answer

3rd postoperative day

Question 2

What is the purpose of pneumatic compression stockings?

Accepted Answer

Prevention of deep vein thrombosis (DVT)

Answer

Prevention of hypothermia

Answer

Management of varicose veins

Answer

Treatment of cellulitis

Question 3

Patient can safely undergo major lung resection without an increased risk of postoperative complications if:

Accepted Answer

FEV1 > 2L, Normal DLCO

Answer

FEV1 > 1L, Decreased DLCO

Answer

FEV1 > 1L, Normal DLCO

Answer

FEV1 > 2L, Decreased DLCO

Question 4

Which of the following is the preferred cannulation site for total parenteral nutrition?

Accepted Answer

Subclavian vein

Answer

Great Saphenous vein

Answer

Median cubital vein

Answer

External jugular vein

Question 5

Which pre-operative investigation is recommended before surgical procedures in a patient on warfarin therapy?

Accepted Answer

International Normalized Ratio (INR)

Answer

Partial Thromboplastin Time (PTT)

Answer

Clotting Time

Answer

Differential Count

Question 6

Post-operative pulmonary thromboembolism is seen in all, except:

Accepted Answer

Tall and thin man

Answer

Obese male

Answer

Pregnant female

Answer

Estrogen therapy

Question 7

What is the cardiac risk associated with breast surgery?

Accepted Answer

< 1%

Answer

> 10 %

Answer

1 - 5 %

Answer

5 - 10 %

Question 8

In a post-operative patient, 21 years old with a weight of 70 kg, what is the expected increase in hematocrit after transfusion of 1 unit of packed RBC?

Accepted Answer

3-5%

Answer

1%

Answer

10%

Answer

15%

Question 9

Which of the following is the best way of preventing the development of deep vein thrombosis (DVT) in the postoperative period?

Accepted Answer

Prophylactic heparin

Answer

Early ambulation

Answer

Physiotherapy

Answer

Low dose aspirin

Question 10

Two weeks following the initial management of this patient's chylothorax, there is persistent accumulation of chyle in the pleural space. Which of the following procedures is appropriate management at this time?

Accepted Answer

Thoracotomy and ligation of the thoracic duct

Answer

Neck exploration for thoracic duct injury

Answer

Subdiaphragmatic ligation of the thoracic duct

Answer

Thoracotomy and repair of the thoracic duct injury

Preoperative and Postoperative Care — MCQs

Preoperative and Postoperative Care — MCQs

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