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CPN(C) Perioperative study materials
CPN(C) Perioperative study resources

CPN(C) Perioperative practice questions

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Question 1Preoperative Assessment and Planning

A patient scheduled for elective surgery reports a history of anaphylaxis after eating shellfish. Which preoperative action is most appropriate?

  1. Proceed with surgery and document the allergy in the chart Correct answer.
  2. Administer a shellfish challenge test preoperatively
  3. Obtain allergy testing before any surgery
  4. Cancel surgery permanently and refer to an immunologist

Explanation

A food allergy history is documented and communicated but does not by itself contraindicate elective surgery, because shellfish antigens are not routinely administered perioperatively. The care team should record the allergy and avoid relevant exposures. Permanent cancellation or challenge testing is disproportionate for a food allergy unrelated to the planned procedure.

Question 2Preoperative Assessment and Planning

Which preoperative laboratory test is routinely indicated for a healthy 30-year-old undergoing low-risk ambulatory surgery?

  1. None beyond targeted testing Correct answer.
  2. Coagulation panel
  3. Type and screen
  4. Complete blood count

Explanation

Routine preoperative laboratory testing is not recommended for healthy patients having low-risk procedures because abnormal results rarely change management and can cause unnecessary delay. Testing should be guided by history, comorbidity, and the planned procedure. Broad panels increase cost without improving outcomes.

Question 3Preoperative Assessment and Planning

A patient takes warfarin for atrial fibrillation and needs elective surgery. Which preoperative consideration is most important?

  1. Continue warfarin and monitor for bleeding intraoperatively
  2. Coordinate interruption and bridging with the prescribing clinician Correct answer.
  3. Switch to aspirin two days before surgery
  4. Stop warfarin without bridging and accept stroke risk

Explanation

Anticoagulation management requires coordinated planning based on bleeding risk of the procedure and thrombotic risk of the patient. Bridging decisions and timing of interruption should involve the prescriber. Unilateral changes can cause either bleeding or thromboembolic harm.

Question 4Preoperative Assessment and Planning

Which finding on preoperative assessment most strongly suggests difficult mask ventilation?

  1. Neck circumference of 34 cm
  2. Body mass index of 22
  3. Presence of a full beard Correct answer.
  4. Mallampati class I

Explanation

Beard, edentulous state, obesity, and age over 55 are recognized predictors of difficult mask ventilation. A full beard interferes with mask seal. Mallampati class and normal neck circumference are not strong predictors of mask ventilation difficulty.

Question 5Preoperative Assessment and Planning

A patient with well-controlled asthma is scheduled for elective surgery. Which preoperative instruction is most appropriate?

  1. Start oral corticosteroids routinely for all asthmatics
  2. Discontinue inhaled corticosteroids one week before surgery
  3. Avoid bronchodilators on the morning of surgery
  4. Continue usual inhaled controller medications through the perioperative period Correct answer.

Explanation

Patients with asthma should continue their controller and reliever inhalers perioperatively to maintain airway stability. Routine systemic steroids are not indicated for well-controlled disease. Abrupt withdrawal of inhaled steroids can worsen bronchospasm.

Question 6Preoperative Assessment and Planning

A 68-year-old with diabetes and hypertension is being evaluated before major abdominal surgery. Which assessment best estimates perioperative cardiac risk?

  1. Resting electrocardiogram alone
  2. Measurement of B-type natriuretic peptide
  3. Troponin level drawn in the preoperative clinic
  4. Structured risk index incorporating clinical and surgical factors Correct answer.

Explanation

Validated risk indices combine patient factors and surgical risk to estimate major adverse cardiac events. No single test alone provides equivalent risk stratification. Biomarkers and ECG may add information but are not standalone risk estimates.

Question 7Preoperative Assessment and Planning

Which preoperative fasting interval is appropriate for clear liquids in an adult before elective surgery?

  1. Two hours Correct answer.
  2. Eight hours
  3. Four hours
  4. Six hours

Explanation

Current guidance permits clear liquids up to two hours before anesthesia for most elective cases. Longer fasting does not add safety and may cause dehydration and discomfort. Solid food requires a longer interval.

Question 8Preoperative Assessment and Planning

A patient reports taking ginkgo biloba daily. What is the most relevant preoperative concern?

  1. Increased bleeding tendency Correct answer.
  2. Profound hypertension
  3. Renal tubular damage
  4. Serotonin syndrome

Explanation

Several herbal supplements, including ginkgo, may increase bleeding risk through antiplatelet effects. Patients should be asked specifically about supplements during medication reconciliation. The decision to stop should be individualized with the surgical team.

Question 9Preoperative Assessment and Planning

Which preoperative finding most increases the risk of pulmonary aspiration during induction?

  1. Well-controlled hypothyroidism
  2. Stable angina
  3. Mild seasonal allergic rhinitis
  4. Symptomatic gastroesophageal reflux Correct answer.

Explanation

Symptomatic reflux increases the likelihood of gastric contents in the pharynx and raises aspiration risk. Airway management may be modified accordingly. The other conditions do not directly increase aspiration risk.

Question 10Preoperative Assessment and Planning

A patient with an implanted pacemaker is scheduled for surgery using monopolar electrocautery near the chest. Which preoperative step is most important?

  1. Obtain device interrogation and plan perioperative management Correct answer.
  2. Place the cautery pad on the contralateral thigh
  3. Disable the pacemaker without consultation
  4. Cancel the procedure

Explanation

Device interrogation before surgery identifies battery status, programming, and dependency. A perioperative plan can then be made with the device team. Electrocautery may interfere with device function and requires coordinated management.

Question 11Preoperative Assessment and Planning

Which preoperative medication history most increases the risk of adrenal crisis during surgery?

  1. Long-term high-dose prednisone Correct answer.
  2. Daily low-dose aspirin
  3. Topical hydrocortisone cream
  4. Occasional inhaled albuterol

Explanation

Chronic systemic corticosteroid use can suppress the hypothalamic-pituitary-adrenal axis, and these patients may require perioperative stress-dose steroids. Inhaled, topical, and antiplatelet agents do not produce this effect.

Question 12Preoperative Assessment and Planning

A patient with sickle cell disease is scheduled for surgery. Which preoperative measure is most appropriate?

  1. Elective surgery during a vaso-occlusive crisis
  2. Hydration and avoidance of dehydration and hypoxia Correct answer.
  3. Routine preoperative transfusion for all patients regardless of severity
  4. Withholding all analgesics before surgery

Explanation

Perioperative management of sickle cell disease emphasizes hydration, oxygenation, temperature control, and avoidance of triggers. Transfusion decisions are individualized rather than universal. Surgery during a crisis should be deferred when feasible.

Question 13Preoperative Assessment and Planning

Which preoperative assessment question best identifies risk for obstructive sleep apnea?

  1. Dietary caffeine intake
  2. Preferred sleeping position
  3. Number of hours slept per night
  4. History of witnessed apneas or loud snoring Correct answer.

Explanation

Witnessed apneas, loud snoring, and daytime somnolence are key features of obstructive sleep apnea. Identifying these allows appropriate perioperative monitoring and planning. Sleep duration and caffeine intake are not diagnostic.

Question 14Preoperative Assessment and Planning

A patient reports a prior severe reaction to latex. Which preoperative action is most appropriate?

  1. Use powdered gloves to minimize contact
  2. Premedicate with antihistamines and proceed normally
  3. Ensure a latex-free environment and communicate the allergy Correct answer.
  4. Schedule the case first in the morning to reduce airborne latex

Explanation

Latex allergy requires a latex-free environment throughout the perioperative area, with clear communication across the team. Premedication alone does not prevent anaphylaxis. Powdered gloves can aerosolize latex proteins and worsen risk.

Question 15Preoperative Assessment and Planning

Which preoperative factor most increases the risk of postoperative delirium in an older adult?

  1. Stable hypertension
  2. Mild anemia
  3. Corrected refractive error
  4. Preoperative cognitive impairment Correct answer.

Explanation

Preoperative cognitive impairment is one of the strongest predictors of postoperative delirium. Identifying it allows delirium-prevention strategies. Mild anemia and stable hypertension are less strongly associated.

Question 16Preoperative Assessment and Planning

A patient is scheduled for surgery and reports a recent myocardial infarction. Which interval is generally recommended before elective surgery?

  1. Six months Correct answer.
  2. Six weeks
  3. Two weeks
  4. One week

Explanation

Elective surgery is generally deferred for about six months after myocardial infarction to reduce the risk of perioperative cardiac events. Shorter intervals are associated with higher risk. Urgent procedures require individualized multidisciplinary planning.

Question 17Preoperative Assessment and Planning

Which preoperative test is most useful to assess functional capacity in a patient scheduled for major surgery?

  1. Ability to climb two flights of stairs Correct answer.
  2. Serum potassium
  3. Body temperature
  4. Resting heart rate

Explanation

Functional capacity can be estimated by the ability to perform activities such as climbing two flights of stairs, which correlates with cardiac reserve. This guides further cardiac testing. Resting vital signs and electrolytes do not assess functional capacity.

Question 18Preoperative Assessment and Planning

A patient with chronic kidney disease is scheduled for surgery. Which preoperative consideration is most important?

  1. Reviewing medications and electrolyte status Correct answer.
  2. Withholding all antihypertensives
  3. Routine dialysis for all patients
  4. Avoiding all intravenous fluids

Explanation

Patients with chronic kidney disease require review of medications, electrolytes, volume status, and dialysis timing. Fluid management should be individualized, not avoided universally. Routine dialysis is not indicated for every patient.

Question 19Preoperative Assessment and Planning

Which preoperative instruction is appropriate for a patient taking metformin before surgery?

  1. Follow a perioperative plan that may include holding it based on renal function and contrast use Correct answer.
  2. Double the dose the night before surgery
  3. Continue metformin unchanged in all cases
  4. Stop metformin permanently

Explanation

Perioperative metformin management depends on renal function, procedure, and contrast exposure, and should follow an individualized plan. Permanent discontinuation is unnecessary. Dose doubling is unsafe.

Question 20Preoperative Assessment and Planning

Which preoperative factor most increases the risk of difficult intubation?

  1. Previous uncomplicated surgery
  2. History of seasonal allergies
  3. Body mass index of 24
  4. Mallampati class IV Correct answer.

Explanation

Mallampati class IV is associated with difficult laryngoscopy and intubation. A normal BMI and uncomplicated prior surgery are reassuring. Allergic rhinitis does not predict difficult intubation.

Question 21Preoperative Assessment and Planning

A patient with a history of malignant hyperthermia is scheduled for surgery. Which preoperative action is essential?

  1. Cancel surgery permanently
  2. Premedicate with dantrolene for all patients
  3. Use standard anesthesia without modification
  4. Plan a trigger-free anesthetic and avoid succinylcholine and volatile agents Correct answer.

Explanation

Patients with malignant hyperthermia susceptibility require a trigger-free anesthetic, avoiding succinylcholine and volatile anesthetics. Dantrolene should be available, but routine preoperative dosing is not standard. Surgery can proceed with proper planning.

Question 22Preoperative Assessment and Planning

Which preoperative counseling point is most important for a patient who smokes?

  1. Smoking has no effect on surgical outcomes
  2. Smoking should be continued to prevent withdrawal
  3. Smoking only affects wound healing
  4. Smoking cessation several weeks before surgery reduces pulmonary complications Correct answer.

Explanation

Smoking cessation before surgery reduces pulmonary complications and improves wound healing. The greatest benefit occurs with longer cessation, but stopping even weeks before surgery is beneficial. Continuing to smoke increases risk.

Question 23Preoperative Assessment and Planning

A patient is scheduled for surgery and reports taking clopidogrel. Which preoperative consideration is most important?

  1. Switch to warfarin
  2. Continue clopidogrel in all cases
  3. Assess bleeding risk and coordinate timing of interruption with the prescriber Correct answer.
  4. Give vitamin K preoperatively

Explanation

Clopidogrel increases bleeding risk, and its interruption must be coordinated with the prescribing clinician, especially after stent placement. The decision balances bleeding and thrombotic risk. Warfarin and vitamin K are not appropriate substitutes.

Question 24Preoperative Assessment and Planning

Which preoperative assessment is most important for a patient with a history of alcohol use disorder?

  1. Assessment for withdrawal risk and nutritional status Correct answer.
  2. Assessment of visual acuity
  3. Measurement of hair cortisol
  4. Routine urine drug screen

Explanation

Patients with alcohol use disorder are at risk for withdrawal, nutritional deficiencies, and hepatic dysfunction, all of which affect perioperative care. Screening and planning for withdrawal prevention are essential. Other tests are not primary preoperative priorities.

Question 25Preoperative Assessment and Planning

A patient is scheduled for surgery and has an elevated blood pressure of 178/104 mmHg on the day of surgery. What is the most appropriate next step?

  1. Cancel surgery permanently
  2. Assess for symptoms and repeat the measurement, then decide with the surgical team Correct answer.
  3. Proceed immediately without evaluation
  4. Give intravenous antihypertensives without assessment

Explanation

Markedly elevated blood pressure on the day of surgery requires assessment for symptoms and confirmation of the reading. Management depends on whether the elevation is chronic or acute and on the urgency of surgery. Immediate decisions should be made with the team.

Question 26Preoperative Assessment and Planning

During preoperative assessment, a patient reports a history of anaphylaxis to penicillin. Which action is most important for the perioperative nurse to take?

  1. Document the allergy and ensure it is clearly communicated to the surgical team and pharmacy. Correct answer.
  2. Premedicate with diphenhydramine before any antibiotic is given.
  3. Delay surgery until allergy testing is completed.
  4. Administer a test dose of penicillin to confirm the allergy.

Explanation

A documented allergy must be clearly communicated to all perioperative team members and pharmacy to prevent accidental exposure to the allergen. Premedication does not reliably prevent anaphylaxis and is not a substitute for avoidance. Allergy testing is not required before emergency surgery.

Question 27Preoperative Assessment and Planning

A patient is scheduled for elective surgery and asks why fasting is necessary. Which explanation by the nurse is most accurate?

  1. Fasting improves the effectiveness of anesthetic agents.
  2. Fasting lowers the risk of postoperative nausea and vomiting.
  3. Fasting reduces the risk of pulmonary aspiration during anesthesia. Correct answer.
  4. Fasting prevents dehydration during the procedure.

Explanation

The primary purpose of preoperative fasting is to reduce gastric volume and acidity, thereby lowering the risk of aspiration of gastric contents during induction of anesthesia. Dehydration prevention, nausea reduction, and anesthetic efficacy are not the main reasons for fasting.

Question 28Preoperative Assessment and Planning

A 45-year-old patient with no known allergies is scheduled for surgery. During the preoperative interview, the patient mentions taking a daily multivitamin and occasional ibuprofen. Which action should the nurse take next?

  1. Ask the patient to provide a list of all medications and supplements. Correct answer.
  2. Instruct the patient to stop the multivitamin immediately.
  3. Document the medications and inform the anesthesia provider.
  4. No action is needed because these are over-the-counter products.

Explanation

A complete medication history, including over-the-counter products and supplements, is essential for safe anesthesia and surgical planning. The nurse should obtain a detailed list rather than simply documenting the two mentioned items. Informing the anesthesia provider is important but follows a thorough history.

Question 29Preoperative Assessment and Planning

A 70-year-old patient is undergoing preoperative assessment for major surgery. The patient reports a recent fall at home and has a history of osteoporosis. Which preoperative intervention is most important?

  1. Order a bone density scan before surgery.
  2. Schedule surgery earlier to reduce the risk of further falls.
  3. Recommend starting calcium and vitamin D supplements.
  4. Implement fall precautions and assess mobility and home safety. Correct answer.

Explanation

A recent fall in an older adult indicates increased risk for perioperative complications and postoperative falls. The priority is to assess mobility, implement fall precautions, and address home safety to prevent further injury. Bone density scans and supplements are not immediate preoperative priorities.

Question 30Preoperative Assessment and Planning

A patient with a body mass index of 42 kg/m² is scheduled for laparoscopic cholecystectomy. Which preoperative assessment is most important to reduce the risk of perioperative complications?

  1. Ordering a routine chest X-ray.
  2. Measuring abdominal circumference.
  3. Assessing for obstructive sleep apnea and difficult airway. Correct answer.
  4. Checking a fasting lipid panel.

Explanation

Obesity is associated with obstructive sleep apnea and difficult airway management, both of which significantly increase perioperative risk. Screening for these conditions allows appropriate planning, such as positioning, equipment selection, and postoperative monitoring. Lipid panels and chest X-rays are not routine preoperative tests for this purpose.

Question 31Pediatric Surgical Anatomy and Physiology

At what age does the infant's hemoglobin typically reach its physiologic nadir, a point relevant when scheduling elective surgery?

  1. At birth
  2. Around 6 years of age
  3. Around 12 months of age
  4. Around 2 to 3 months of age Correct answer.

Explanation

After birth, hemoglobin falls as erythropoiesis is suppressed by improved oxygenation and by dilution from rapid plasma volume expansion, reaching a nadir near 2 to 3 months. This physiologic anemia is most pronounced in premature infants and influences timing of elective procedures and transfusion thresholds.

Question 32Pediatric Surgical Anatomy and Physiology

Which feature of the pediatric airway makes the infant most susceptible to airway obstruction during anesthesia?

  1. A large, floppy epiglottis and a narrow, compliant subglottic region Correct answer.
  2. A relatively large functional residual capacity
  3. A rigid cartilaginous larynx resistant to edema
  4. Complete ossification of the cricoid ring

Explanation

The infant larynx sits higher and more anterior, the epiglottis is omega-shaped and floppy, and the narrowest point is the compliant cricoid ring. Even small amounts of edema narrow this already small lumen dramatically because resistance rises with the fourth power of radius change.

Question 33Pediatric Surgical Anatomy and Physiology

A neonate requires emergency surgery. Which hepatic physiologic characteristic most affects drug dosing?

  1. Increased hepatic blood flow compared with adults
  2. Higher plasma protein binding of acidic drugs
  3. Reduced hepatic enzyme activity and lower albumin binding in the first weeks of life Correct answer.
  4. Complete maturation of cytochrome enzymes at birth

Explanation

Neonatal hepatic metabolic pathways are immature, and lower albumin and alpha-1-acid glycoprotein levels increase the free fraction of many drugs. Together these prolong elimination and increase drug effect, so doses are adjusted accordingly.

Question 34Pediatric Surgical Anatomy and Physiology

Why do infants desaturate faster than adults during apnea?

  1. Their chest wall is rigid and cannot collapse
  2. Their oxygen consumption per kilogram is higher and functional residual capacity is smaller Correct answer.
  3. Their alveoli have thicker membranes with reduced diffusion
  4. Their hemoglobin has higher oxygen affinity than fetal hemoglobin

Explanation

Infants consume oxygen at roughly twice the adult rate per kilogram while having a smaller functional residual capacity, so the oxygen reservoir is depleted quickly. This combination shortens safe apnea time and mandates prompt preoxygenation.

Question 35Pediatric Surgical Anatomy and Physiology

A 4-year-old is scheduled for surgery. What is the approximate normal resting heart rate for this age?

  1. 130 to 170 beats per minute
  2. 20 to 40 beats per minute
  3. 40 to 60 beats per minute
  4. 80 to 120 beats per minute Correct answer.

Explanation

Resting heart rate declines with age: newborns average 120 to 160, toddlers and preschoolers roughly 80 to 120, and school-age children lower still. Knowing the age-appropriate range prevents mislabeling normal sinus rhythm as tachycardia or bradycardia.

Question 36Pediatric Surgical Anatomy and Physiology

During laparoscopy in an infant, which factor most increases the risk of hypothermia?

  1. Large body surface area relative to mass with limited subcutaneous fat Correct answer.
  2. High basal metabolic rate that generates excess heat
  3. Thick keratinized skin reducing heat loss
  4. Mature thermoregulatory shivering response

Explanation

Infants have a high surface-area-to-mass ratio, thin skin, and little insulating fat, so heat is lost rapidly by evaporation, conduction, and radiation. Insufflation with cool dry gas and a cool operating room amplify this loss, so active warming is essential.

Question 37Pediatric Surgical Anatomy and Physiology

Which renal characteristic of the neonate most influences perioperative fluid and drug management?

  1. Increased renal blood flow compared with adults
  2. Hyperconcentration of urine exceeding adult capacity
  3. Complete maturation of tubular secretion at birth
  4. Low glomerular filtration rate and limited concentrating ability Correct answer.

Explanation

Nephrogenesis continues until about 34 to 36 weeks, and glomerular filtration and tubular function mature over the first months. Neonates therefore clear drugs slowly and cannot concentrate urine well, making them prone to both fluid overload and dehydration.

Question 38Pediatric Surgical Anatomy and Physiology

What is the approximate circulating blood volume of a healthy infant?

  1. 80 to 90 mL/kg Correct answer.
  2. 200 to 220 mL/kg
  3. 40 to 50 mL/kg
  4. 150 to 170 mL/kg

Explanation

Infant blood volume is approximately 80 to 90 mL/kg, higher than the adult value of about 70 mL/kg, while premature neonates may reach 90 to 100 mL/kg. This larger relative volume means small absolute losses represent a greater fraction of total volume.

Question 39Pediatric Surgical Anatomy and Physiology

An infant's spinal cord terminates at a different level than an adult's. Where does the conus medullaris typically end in a term neonate?

  1. At the C7 vertebral level
  2. At the T12 vertebral level
  3. Around the L2 to L3 vertebral level Correct answer.
  4. At the S4 to S5 vertebral level

Explanation

In term neonates the conus medullaris ends near L2 to L3 and ascends to the adult L1 to L2 level by early childhood. This higher relative cord position means lumbar puncture and neuraxial blocks should be placed at a lower interspace than in adults.

Question 40Pediatric Surgical Anatomy and Physiology

Which statement about the neonatal circulation best explains the risk of persistent fetal shunts under anesthesia?

  1. Systemic vascular resistance is lower than pulmonary vascular resistance at all times
  2. The foramen ovale and ductus arteriosus may reopen when pulmonary vascular resistance rises Correct answer.
  3. Pulmonary vascular resistance is fixed and cannot change after birth
  4. The ductus arteriosus is permanently sealed within hours of birth

Explanation

At birth pulmonary vascular resistance falls and systemic resistance rises, reversing shunt flow and functionally closing the foramen ovale and ductus arteriosus. Hypoxia, hypercarbia, acidosis, or hypothermia can raise pulmonary vascular resistance again and reopen these fetal pathways.

Question 41Pediatric Surgical Anatomy and Physiology

A toddler is undergoing surgery. Which factor most increases the risk of gastric aspiration during induction?

  1. Rapid gastric emptying compared with adults
  2. Increased lower esophageal sphincter tone
  3. Delayed gastric emptying and a short esophagus with a lax lower esophageal sphincter Correct answer.
  4. A long intra-abdominal esophageal segment

Explanation

Children have relatively delayed gastric emptying, a shorter esophagus, and a lax lower esophageal sphincter, so gastric contents reflux more readily. This anatomy, combined with crying and air swallowing, raises aspiration risk during inhalational induction.

Question 42Pediatric Surgical Anatomy and Physiology

Why is the infant's oxygen-hemoglobin dissociation curve shifted left compared with an adult's?

  1. Increased body temperature
  2. Predominance of fetal hemoglobin with lower 2,3-DPG interaction Correct answer.
  3. Elevated 2,3-DPG levels
  4. Higher adult hemoglobin concentration

Explanation

Fetal hemoglobin has a higher affinity for oxygen and interacts less with 2,3-diphosphoglycerate, shifting the curve left. This aids placental oxygen uptake in utero but means oxygen unloading to tissues is less efficient after birth.

Question 43Pediatric Surgical Anatomy and Physiology

Which anatomic feature of the pediatric rib cage contributes to early airway closure during anesthesia?

  1. Downward-sloping ribs with rigid costal cartilage
  2. A small diaphragm with limited excursion
  3. Horizontal ribs and a compliant chest wall with high closing volume Correct answer.
  4. A rigid, barrel-shaped thorax

Explanation

The infant rib cage is compliant and the ribs lie more horizontally, so the outward elastic recoil is weak and closing volume may exceed functional residual capacity. This predisposes to airway closure and atelectasis, especially during general anesthesia.

Question 44Pediatric Surgical Anatomy and Physiology

A child requires an emergency transfusion. Which blood component consideration is specific to the pediatric patient?

  1. Small volumes require careful calculation and cytomegalovirus-safe products may be indicated for neonates Correct answer.
  2. Packed red cells must always be given undiluted at adult volumes
  3. Platelet transfusion is contraindicated in children
  4. Fresh frozen plasma is preferred over red cells for anemia

Explanation

Pediatric transfusions are dosed by weight, often 10 to 15 mL/kg of packed red cells, and small volumes must be measured precisely to avoid overload. Neonates may require irradiated or cytomegalovirus-safe products because of immature immunity.

Question 45Pediatric Surgical Anatomy and Physiology

Which feature of neonatal glucose metabolism places a fasting infant at risk during the preoperative period?

  1. Excessive hepatic glycogen reserves
  2. Limited hepatic glycogen stores and immature gluconeogenesis Correct answer.
  3. Mature insulin counter-regulatory hormone response
  4. High rates of gluconeogenesis at birth

Explanation

Neonates have small glycogen reserves and immature gluconeogenic and ketogenic pathways, so they become hypoglycemic quickly when fasting. Preoperative dextrose-containing fluids and minimized fasting times help maintain normoglycemia.

Question 46Pediatric Surgical Anatomy and Physiology

What is the approximate normal respiratory rate for a healthy 6-year-old child?

  1. 8 to 12 breaths per minute
  2. 18 to 25 breaths per minute Correct answer.
  3. 30 to 40 breaths per minute
  4. 40 to 60 breaths per minute

Explanation

Respiratory rate decreases with age, falling from about 30 to 60 in neonates to roughly 18 to 25 by school age and 12 to 20 in adolescence. Recognizing the expected rate helps detect respiratory compromise early.

Question 47Pediatric Surgical Anatomy and Physiology

Which cranial anatomic feature of infants affects airway management during mask ventilation?

  1. A proportionally large occiput that can flex the neck when lying supine Correct answer.
  2. A short, rigid neck
  3. A small head relative to the body
  4. A fully developed mandible with a prominent chin

Explanation

Infants have a large occiput and a short neck, so lying flat can flex the cervical spine and obstruct the airway. Placing a small shoulder roll or pad under the shoulders helps align the airway axes for mask ventilation and intubation.

Question 48Pediatric Surgical Anatomy and Physiology

A neonate with a large omphalocele is scheduled for repair. Which physiologic consideration is most important during induction?

  1. Rapid insufflation of the abdomen to facilitate reduction
  2. Deliberate hyperventilation to lower pulmonary blood flow
  3. Avoiding increases in intra-abdominal pressure and supporting ventilation because of reduced abdominal domain Correct answer.
  4. Immediate clamping of the sac to prevent heat loss

Explanation

A large abdominal wall defect means the abdominal cavity is small and poorly compliant, so increases in intra-abdominal pressure impair ventilation and venous return. Gentle handling, avoidance of gastric distension, and careful ventilation are priorities.

Question 49Pediatric Surgical Anatomy and Physiology

Which developmental change explains why a school-age child tolerates longer fasting better than a neonate?

  1. Immature counter-regulatory hormone response
  2. Reduced body fat reserves
  3. Increased hepatic glycogen stores and more mature gluconeogenesis Correct answer.
  4. Higher basal metabolic rate per kilogram

Explanation

As children grow, hepatic glycogen reserves increase and gluconeogenic pathways mature, allowing them to sustain longer fasting periods without hypoglycemia. Neonates have the least reserve and the highest metabolic demand relative to mass.

Question 50Pediatric Surgical Anatomy and Physiology

Which feature of the pediatric trachea affects the choice of endotracheal tube size?

  1. The trachea has a rigid, fully ossified ring system
  2. The glottis is the narrowest point, as in adults
  3. The cricoid ring is the narrowest point, so tube size is limited by the subglottic diameter Correct answer.
  4. The tracheal length is greater than in adults

Explanation

In children the cricoid cartilage forms the narrowest portion of the airway, so an uncuffed tube must pass without excessive pressure at this ring. Age-based formulas estimate size, but a leak test and direct assessment guide the final choice.