Preparation of Patient for Surgery — MCQs
What should be the minimum value of HbA1c to safely carry out a surgical procedure in an emergency setting?
A 63-year-old man presents for an elective laparoscopic cholecystectomy. He is obese, has angina at rest, and chronic obstructive pulmonary disease (COPD). Which of the following would be his American society of Anesthesiologists (ASA) physical status classification
Nil per oral orders for an 8-year-old child posted for elective nasal polyp surgery at 8 AM include all of the following EXCEPT:
A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?
Which of the following is the LEAST significant risk factor for postoperative pulmonary complications?
Preoperative medication of thyrotoxicosis are all except?
When do we have to start antibiotics to prevent post-operative infection?
Which of the following is not a risk factor for postoperative pulmonary complication?
Which of the following is true regarding prophylactic antibiotic use in surgical practice?
Preoperative investigations done prior to surgery depend upon which of the following? 1. Type of surgery 2. Patient origin 3. Patient comorbidities 4. Experience of surgeon
Preparation of Patient for Surgery Indian Medical PG Practice Questions and MCQs
Question 1: What should be the minimum value of HbA1c to safely carry out a surgical procedure in an emergency setting?
- A. <7
- B. <8
- C. <10 (Correct Answer)
- D. <8
Explanation: ***<10*** - In an **emergency setting**, the priority is to proceed rapidly with surgery; current guidelines suggest that an **HbA1c <10%** is acceptable to proceed without significant delay for optimization. - While lower HbA1c is ideal, delaying an emergency procedure to achieve an HbA1c below 10% is generally **not recommended**, as the benefits of urgent surgery outweigh the risks associated with this level of glycemic control [1]. *<7* - An HbA1c of **<7% is the general target** for optimal glycemic control in most diabetic patients, especially in an elective setting. - Achieving this level in an emergency would likely require **delaying surgery**, which is not feasible or safe when immediate intervention is needed. *<8* - An HbA1c of **<8%** represents good control for many individuals, particularly older adults or those with comorbidities. - While better than 10%, it is not the absolute minimum required to proceed with an **emergency surgery**, as timely intervention is paramount. *<8* - An HbA1c of **<8%** represents good control for many individuals, particularly older adults or those with comorbidities. - While better than 10%, it is not the absolute minimum required to proceed with an **emergency surgery**, as timely intervention is paramount.
Question 2: A 63-year-old man presents for an elective laparoscopic cholecystectomy. He is obese, has angina at rest, and chronic obstructive pulmonary disease (COPD). Which of the following would be his American society of Anesthesiologists (ASA) physical status classification
- A. ASA II
- B. ASA I
- C. ASA IV
- D. ASA III (Correct Answer)
Explanation: ***ASA III*** - This patient has **severe systemic disease** (angina at rest, COPD, obesity) that limits activity but is not incapacitating, aligning with the criteria for **ASA III**. - **Angina at rest** and **chronic obstructive pulmonary disease (COPD)** are significant comorbidities that place the patient in this category. *ASA II* - **ASA II** is defined by **mild systemic disease** that does not limit activity. - The patient's conditions such as **angina at rest** and **COPD** are more severe than what would be considered mild. *ASA I* - **ASA I** is reserved for a **normal, healthy patient** with no systemic disease. - This patient has multiple significant systemic diseases, unequivocally ruling out ASA I. *ASA IV* - **ASA IV** describes a patient with **severe systemic disease** that is a constant threat to life. - While critical, the patient's conditions (angina at rest, COPD) are stabilised enough for an **elective procedure** and are not an immediate, constant threat to life.
Question 3: Nil per oral orders for an 8-year-old child posted for elective nasal polyp surgery at 8 AM include all of the following EXCEPT:
- A. Apple juice can be taken at 10 PM previous night
- B. Milk can be taken at 7 AM in morning (Correct Answer)
- C. Can take sips of water up to 6 AM in morning
- D. Rice can be consumed at 11 PM previous night
Explanation: **Milk can be taken at 7 AM in morning** - For an 8-year-old undergoing elective surgery at 8 AM, **milk is considered a solid or heavy fluid** and should be stopped at least **6 hours pre-operatively**. - Taking milk at 7 AM, just one hour before surgery, significantly increases the risk of **pulmonary aspiration** during anesthesia. *Apple juice can be taken at 10 PM previous night* - **Clear liquids**, such as apple juice, can generally be consumed up to **2 hours before surgery** in children. - Taking apple juice at 10 PM the night before for an 8 AM surgery falls well within the safe fasting window for clear liquids. *Can take sips of water up to 6 AM in morning* - **Sips of water** are considered a clear liquid and can be consumed up to **2 hours before surgery** in children. - Allowing water until 6 AM for an 8 AM surgery is appropriate and helps prevent dehydration without increasing aspiration risk. *Rice can be consumed at 11 PM previous night* - **Solid foods**, like rice, require a longer fasting period, typically at least **6-8 hours before surgery**. - Consuming rice at 11 PM the night before, for an 8 AM surgery, allows for sufficient gastric emptying and is generally safe.
Question 4: A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?
- A. Postoperative administration for 5 to 7 days of parenteral antibiotics effective against aerobes and anaerobes
- B. A single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes may provide initial coverage. (Correct Answer)
- C. Postoperative administration for 2 to 4 days of parenteral antibiotics effective against aerobes and anaerobes
- D. Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile
Explanation: ***Single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes*** - For **elective colorectal surgery**, a single dose of a **broad-spectrum parenteral antibiotic** administered within 60 minutes prior to incision is the standard of care to reduce surgical site infections. - This approach ensures adequate drug levels in the tissues during the period of potential bacterial contamination and is a cornerstone of modern surgical prophylaxis. - Current guidelines (WHO, SCIP) recommend a single preoperative dose, which may be redosed intraoperatively if the procedure is prolonged beyond 3-4 hours. *Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile* - This is **incorrect**. **Oral antibiotics** (such as neomycin and metronidazole) are routinely used preoperatively in conjunction with mechanical bowel preparation for colorectal surgery to reduce intraluminal bacterial load. - The concern for *Clostridioides difficile* infection is generally low with short-term, targeted prophylactic antibiotic regimens compared to broad-spectrum, prolonged use. - The combination of oral and parenteral antibiotics has been shown to further reduce surgical site infections. *Postoperative administration for 5 to 7 days of parenteral antibiotics* - **Prolonged postoperative antibiotic administration** beyond 24 hours in uncomplicated cases is not recommended as it increases the risk of **antibiotic resistance**, *C. difficile* infection, and adverse drug reactions without additional benefit. - The goal of prophylactic antibiotics is to cover the period of contamination during surgery, not to treat presumed ongoing infection postoperatively. *Postoperative administration for 2 to 4 days of parenteral antibiotics* - While administration for up to 24 hours post-operatively may be considered in some high-risk cases, routine **prolonged postoperative antibiotics** (2-4 days) are unnecessary for most elective colorectal resections. - Evidence suggests that continuing antibiotics beyond the immediate perioperative period does not further reduce the incidence of **surgical site infections** in clean-contaminated surgeries.
Question 5: Which of the following is the LEAST significant risk factor for postoperative pulmonary complications?
- A. Age >70
- B. Patient with 7 pack years of smoking
- C. Upper abdominal surgery
- D. BMI>30 (Correct Answer)
Explanation: ***BMI>30*** - While **obesity (BMI >30)** is associated with some surgical risks, it is generally considered a less significant independent risk factor for postoperative pulmonary complications compared to other factors like age, smoking, and surgical site. - The impact of obesity on pulmonary function is complex and varies depending on the type of surgery and presence of comorbid conditions like **sleep apnea**. *Age >70* - **Advanced age (>70)** is a significant independent risk factor due to decreased physiological reserve, reduced pulmonary function (e.g., decreased lung elasticity, impaired cough reflex), and increased prevalence of comorbidities. - Older patients are more susceptible to **atelectasis**, **pneumonia**, and **respiratory failure** postoperatively. *Patient with 7 pack years of smoking* - Even a relatively low cumulative smoking history of **7 pack-years** can impair mucociliary clearance, increase bronchial secretions, and cause airway inflammation, significantly increasing the risk of pulmonary complications. - Smoking compromises lung function and increases the risk of **bronchospasm** and infection. *Upper abdominal surgery* - **Upper abdominal surgery** is a significant risk factor because incisions close to the diaphragm interfere with diaphragmatic movement, leading to reduced lung volumes, impaired cough, and increased risk of **atelectasis** and **pneumonia**. - Pain from the incision further restricts deep breaths and coughing, contributing to pulmonary complications.
Question 6: Preoperative medication of thyrotoxicosis are all except?
- A. Carbimazole
- B. PTU
- C. Propranolol
- D. Levothyroxine (Correct Answer)
Explanation: Levothyroxine - Levothyroxine is a synthetic thyroid hormone used to treat hypothyroidism, meaning it increases thyroid hormone levels, which would worsen thyrotoxicosis [1]. - Its administration would be contraindicated in a patient with thyrotoxicosis, as the goal is to reduce thyroid hormone levels preoperatively. Carbimazole - Carbimazole is a thionamide drug that inhibits the synthesis of thyroid hormones, making it a critical medication for treating hyperthyroidism and preparing patients for surgery [1]. - It reduces the amount of thyroid hormone produced by the thyroid gland, thus mitigating the risks associated with thyrotoxicosis during surgery. PTU - Propylthiouracil (PTU), like carbimazole, is a thionamide that blocks thyroid hormone synthesis and also inhibits the conversion of T4 to T3 [1]. - It is used in the preoperative management of thyrotoxicosis to achieve a euthyroid state and prevent a thyroid storm. Propranolol - Propranolol is a beta-blocker used to manage the symptoms of thyrotoxicosis, particularly the cardiovascular effects such as tachycardia, palpitations, and tremors [1]. - While it does not affect thyroid hormone levels directly, it helps control symptoms and stabilize the patient preoperatively, making them a safer candidate for surgery [1].
Question 7: When do we have to start antibiotics to prevent post-operative infection?
- A. 1 week before surgery
- B. 2 days before surgery
- C. After surgery
- D. 30-60 minutes before incision (up to 24 hours post-op) (Correct Answer)
Explanation: ***30-60 minutes before incision (up to 24 hours post-op)*** - Surgical antibiotic prophylaxis (SAP) should be administered **30-60 minutes before surgical incision** to ensure adequate tissue and serum concentrations at the time of incision. - This timing allows optimal drug distribution to surgical tissues, which is crucial for preventing surgical site infections (SSIs). - For most clean and clean-contaminated surgeries, prophylaxis should be limited to a **single dose** or continued for **maximum 24 hours post-operatively** as per WHO and CDC guidelines. - Prolonged post-operative antibiotics beyond 24 hours do **not** reduce infection rates and increase the risk of **antibiotic resistance** and **adverse effects**. *1 week before surgery* - Administering antibiotics this far in advance is **unnecessary** and **ineffective** for surgical prophylaxis. - It increases the risk of **antibiotic resistance** and does not guarantee adequate drug levels at the time of incision. - Pre-operative antibiotic use should be avoided unless treating an active infection. *2 days before surgery* - This timeframe is too early to achieve prophylactic benefit during the surgical procedure. - Prolonged pre-operative use promotes **bacterial resistance** without providing additional protection. - Drug levels will not be optimal at the time of incision due to metabolism and excretion. *After surgery* - Starting antibiotics **after surgical incision** is **too late** for prophylaxis as contamination has already occurred. - Post-operative initiation is considered **therapeutic treatment** for established infection, not prevention. - The critical window for prophylaxis is the period from skin incision to wound closure.
Question 8: Which of the following is not a risk factor for postoperative pulmonary complication?
- A. Normal BMI (18.5-24.9) (Correct Answer)
- B. Age 25-40 years
- C. Upper abdominal surgery
- D. Patient with 20 pack years of smoking
Explanation: ***Patient with 20 pack years of smoking*** - This is a significant risk factor for postoperative pulmonary complications, as **chronic smoking** impairs lung function and mucociliary clearance. - Patients with a history of **20 pack-years or more** are at a substantially increased risk of developing atelectasis, pneumonia, and respiratory failure after surgery. *Normal BMI (18.5-24.9)* - A **normal BMI** is not considered a risk factor for postoperative pulmonary complications; instead, it is associated with a lower risk compared to obesity or underweight states. - Patients with a normal BMI generally have **better respiratory mechanics** and lung volumes, reducing their susceptibility to pulmonary issues. *Age 25-40 years* - This age range is generally associated with a **lower risk** of postoperative pulmonary complications compared to very young or elderly patients. - Younger adults typically have **better physiological reserves** and healthier lungs, contributing to a reduced incidence of respiratory problems post-surgery. *Upper abdominal surgery* - **Upper abdominal surgery** is a significant risk factor for postoperative pulmonary complications due to its proximity to the diaphragm. - It often leads to **diaphragmatic dysfunction**, reduced lung volumes, and increased pain, all of which predispose patients to atelectasis and pneumonia.
Question 9: Which of the following is true regarding prophylactic antibiotic use in surgical practice?
- A. is given orally
- B. continued for a minimum of 7 days
- C. first dose is given before induction of anesthesia (Correct Answer)
- D. depends on individual preference
Explanation: ***First dose is given before induction of anesthesia*** - **Prophylactic antibiotics** are most effective when present in adequate concentrations in tissue **before the surgical incision** is made - Administering the first dose **within 60 minutes before incision** (typically before induction of anesthesia) ensures optimal tissue levels at the time of potential bacterial contamination - This timing is a **key principle** of effective surgical antibiotic prophylaxis *Is given orally* - Surgical prophylaxis requires **intravenous administration** for rapid and reliable tissue levels - IV route ensures predictable bioavailability and adequate drug concentration at the surgical site - Oral route may be used in specific outpatient scenarios but is **not standard** for surgical prophylaxis *Continued for a minimum of 7 days* - Prophylactic antibiotics are given for **short duration**: typically a **single dose** or continued for less than 24 hours post-operatively - Extended courses (≥7 days) are reserved for **treating established infections**, not prophylaxis - Prolonged use increases risk of **antibiotic resistance**, adverse effects, and *Clostridioides difficile* infection *Depends on individual preference* - Prophylactic antibiotic use follows **evidence-based guidelines** and institutional protocols, not individual preference - Guidelines consider surgery type, patient risk factors, local **antibiogram data**, and established efficacy - Standardized protocols improve outcomes and reduce surgical site infections
Question 10: Preoperative investigations done prior to surgery depend upon which of the following? 1. Type of surgery 2. Patient origin 3. Patient comorbidities 4. Experience of surgeon
- A. 4. Experience of surgeon
- B. 1. Type of surgery (Correct Answer)
- C. 2. Patient origin
- D. 3. Patient comorbidities
Explanation: ***1. Type of surgery*** - The **type of surgery** is a primary determinant of preoperative investigations, as it defines the baseline assessment needed based on the procedure's complexity, invasiveness, and physiological stress. - Minor surgeries (e.g., superficial excisions) typically require minimal investigations, while major surgeries (e.g., cardiac, neurosurgery) mandate comprehensive cardiovascular, pulmonary, and hematological workups. - **Clinical Note:** In practice, preoperative investigations depend on BOTH the surgery type AND patient comorbidities working together, but this question likely seeks the most fundamental starting point. *3. Patient comorbidities* - **Patient comorbidities** are undeniably crucial in determining the extent and nature of preoperative investigations. - A patient with diabetes, hypertension, or cardiac disease requires additional specific investigations regardless of the surgery type. - However, the surgery type establishes the baseline framework, which is then modified based on comorbidities. *2. Patient origin* - **Patient origin** (geographical location, ethnicity) is generally not a direct determinant of preoperative investigation protocols. - While certain populations may have higher prevalence of specific conditions, investigations are based on individual patient assessment, not origin. *4. Experience of surgeon* - The **experience of the surgeon** does not alter the medical necessity or standard protocols for preoperative investigations. - Patient safety standards and investigation requirements remain consistent regardless of surgical expertise level.
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