NBCRNA National Certification Examination: Initial CRNA Preparation Guide Study Guide

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Two patients have the same arterial oxygen tension and saturation, but one has substantially less hemoglobin after bleeding. Identify reduced oxygen-carrying capacity in the anemic patient rather than concluding that their oxygen transport is equivalent.

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A working muscle produces more carbon dioxide and becomes more acidic. Predict that hemoglobin releases oxygen more readily at the same local oxygen tension, helping match oxygen unloading to the muscle's increased metabolic activity.

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During a physiology discussion, a learner assumes that carbon dioxide mainly remains dissolved in plasma. Explain how erythrocyte conversion to bicarbonate allows substantial transport and how the lungs reverse the reaction before carbon dioxide leaves the body.

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After reduced ventilation, an arterial sample shows pH 7.25, carbon dioxide tension 60 mm Hg and bicarbonate near its previous value. Identify acute respiratory acidosis and connect the result to inadequate carbon dioxide elimination.

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A sealed 600-mL sample at 1 atmosphere absolute becomes 300 mL at 2 atmospheres if temperature is unchanged. In a separate rigid container, warming from 20°C to 40°C changes the temperature ratio to 313.15/293.15, approximately 1.068, so pressure rises about 6.8%, rather than doubling.

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At 70 beats/min and 70 mL/beat, cardiac output is 4,900 mL/min, or 4.9 L/min. If stroke volume falls to 35 mL/beat while heart rate rises to 100 beats/min, output is only 3.5 L/min. Tachycardia has not restored the original flow.

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A patient with known hyperthyroidism has persistent resting tachycardia before anesthesia. Include the endocrine disorder in the explanation and assessment instead of assuming that a single episode of anxiety accounts for the sustained cardiovascular stimulation.

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For a patient with creatinine clearance of 22 mL/min, recognize the label's renal limitation before selecting blockade and reversal. When sugammadex is appropriate, match dosing to measured block depth and confirm recovery quantitatively.

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For a separate prescribed infusion of 0.05 microgram/kg/min in an 80-kg patient, the required rate is 4 micrograms/min. A solution containing 4 mg in a final volume of 250 mL contains 16 micrograms/mL. The pump rate is 4 × 60 ÷ 16 = 15 mL/h.

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A patient with confirmed malignant hyperthermia susceptibility requires general anesthesia. Classify sevoflurane and succinylcholine as triggering agents, while recognizing propofol and rocuronium as nontriggering choices within a suitably prepared anesthetic plan for this individual.

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A patient receiving propofol and rocuronium has no movement during surgery. Do not infer adequate hypnosis from immobility. After sugammadex, separately assess quantitative neuromuscular recovery, consciousness, ventilation and the remaining requirements for extubation.

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A patient taking a beta blocker develops bradycardia and hypotension after anesthesia begins. Include medication effect in the assessment, but also evaluate filling and ventricular performance rather than assuming that the slow rate identifies the entire circulatory problem.

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A machine displays apparently satisfactory gas-source pressures, but the circuit oxygen concentration unexpectedly falls. Use the inspired oxygen measurement and alarm to identify the hazardous mixture rather than relying on source pressure or waiting for patient desaturation.

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During sedation with supplemental oxygen, a patient's respiratory effort diminishes and the capnogram disappears while saturation remains 98%. Investigate ventilation and airway patency immediately rather than waiting for the pulse-oximeter value to decline.

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After intubation, chest movement appears present but a sustained carbon dioxide waveform cannot be established. Reassess tube location, ventilation, circulation and monitoring connections instead of accepting visual chest movement as sufficient evidence of correct ongoing airway function.

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An exposed patient has dizziness and a normal conventional pulse-oximeter reading. Request blood CO-oximetry to assess carboxyhemoglobin, using the exposure history to interpret the result rather than selecting another conventional pulse oximeter for confirmation.

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During circle-system anesthesia, inspired carbon dioxide rises despite unchanged ventilation. Assess the absorbent and circuit function, including valves and assembly, instead of treating the rising end-tidal carbon dioxide solely as a need for a higher respiratory rate.

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Inspired carbon dioxide normalizes after canister replacement, but expired tidal volume falls and a leak alarm appears. Check canister seating and circuit integrity rather than assuming the new absorbent has fully resolved the respiratory problem.

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A patient has four palpable twitches and apparently reassuring facial responses after reversal, but quantitative monitoring at the adductor pollicis gives a ratio of 0.72. Recognize residual blockade and continue management rather than accepting twitch count or facial recovery as sufficient.

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An 80-kg patient is prescribed 0.05 microgram/kg/min from a 16-microgram/mL solution. A setting of 15 mL/h delivers 240 micrograms/h, or 4 micrograms/min, matching the prescription. A setting of 15 mL/min would deliver sixty times that hourly volume.

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An implant was scanned uneventfully on a different scanner. Verify its conditions for the new examination and confirm suitable monitoring accessories rather than assuming the earlier scan establishes safety for every protocol.

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After pneumoperitoneum, peak pressure rises from 22 to 32 cm H2O and plateau pressure from 17 to 27 cm H2O at unchanged tidal volume, PEEP and flow. The unchanged 5-cm H2O difference favors reduced compliance over an isolated increase in tube or airway resistance.

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The electrocardiogram remains unchanged while a patient develops concerning signs after induction. Obtain and evaluate blood pressure promptly rather than waiting for the next routine cuff cycle because electrical rhythm alone does not establish adequate circulation.

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An anesthetic involves anticipated clinically significant temperature change. Arrange temperature monitoring and assess the trend even if a warming device is already operating, because device activation does not reveal whether the patient is warming appropriately.

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A patient signs a form but cannot explain the proposed anesthetic or alternatives. Revisit the discussion and check understanding. If the informed patient then declines a regional technique, discuss feasible alternatives rather than equating disagreement with incapacity.

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During operative bleeding, hemoglobin has been supported with red cells but diffuse bleeding persists with a low platelet count and depleted fibrinogen. Recognize separate hemostatic deficits requiring targeted component consideration rather than assuming that additional red cells address every consequence of hemorrhage.

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After an anesthetic, a syringe contains unused medication. Discard it rather than attaching a new needle for the next patient. Prepare the next patient's medication using appropriate uncontaminated supplies and vial practices.

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During facial surgery with open oxygen delivery, discuss oxygen accumulation and electrosurgical activation before incision. Configure drapes to limit pooling and confirm that the alcohol preparation has dried.

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A healthy adult reports drinking only water three hours before an elective procedure. Recognize that this exceeds the guideline's two-hour clear-liquid minimum, while still assessing other aspiration risks and confirming the actual substance and ingestion time.

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An elective patient reports a large fried breakfast seven hours earlier. Identify that the meal does not fit the light-meal category and reassess timing and aspiration risk rather than treating six elapsed hours as sufficient for every solid meal.

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A patient has anticipated difficult intubation, poor apnea tolerance and uncertain mask ventilation. Recognize the combination as support for an awake strategy rather than selecting induction solely because a video laryngoscope will be available in the room.

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Two attempts with the same setup fail and airway trauma is increasing. Pause to restore oxygenation, summon appropriate help and choose a changed approach instead of repeating an identical attempt because the previous view was nearly adequate.

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A supraglottic airway restores oxygenation after failed intubation. Preserve that benefit while reassessing the next step. If surgery proceeds and airway edema develops, establish an explicit extubation and reintubation strategy before removing the definitive airway.

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A hemodynamically stable patient with effective labor epidural analgesia needs urgent cesarean delivery. Consider extending the functioning epidural to surgical anesthesia rather than assuming that urgency automatically requires either a new spinal puncture or general anesthesia.

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After spinal anesthesia, an uncomplicated term patient develops hypotension without bradycardia. Verify uterine displacement, assess for bleeding or other causes and treat promptly; phenylephrine is a supported vasopressor choice in this setting.

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A patient initially follows spoken commands but later responds only to repeated painful stimulation and needs jaw thrust. Recognize the actual deeper state and actively support airway patency and ventilation while adjusting sedation.

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During an ultrasound-guided block, the target nerve is visible but injection produces severe radiating pain. Stop injection and reassess rather than continuing solely because the ultrasound image appears satisfactory.

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A patient with suspected placenta accreta is scheduled for delivery. Arrange blood-bank coordination and hemorrhage resources beforehand. If major hemorrhage causes instability, reassess the anesthetic technique; general anesthesia with a tracheal tube may be preferable to initiating neuraxial anesthesia.

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Soon after a peripheral block, seizure progresses to hypotension and ventricular dysrhythmia. Coordinate ventilation, benzodiazepine treatment and lipid rescue. If epinephrine is needed, use the checklist's reduced starting dose rather than automatically applying a standard adult arrest bolus.

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During propofol sedation, a patient becomes hypotensive, responds only to painful stimulation and needs jaw thrust. Recognize excessive depth with airway compromise, support ventilation and circulation, and reassess drug administration rather than continuing solely because saturation remains normal on oxygen.

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Assign a clinician to track all bolus and infusion volumes while others support ventilation and circulation. Persistent instability prompts escalation, while the cumulative total must remain visible. Use the immediately available ASRA checklist throughout.

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For a patient vulnerable to opioid-related respiratory effects, combine an appropriate regional technique with suitable nonopioid analgesics and reassessed rescue medication. Evaluate pain and function rather than increasing opioid doses automatically whenever discomfort is reported after surgery.

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In an illustrative case, a hypotensive patient has delayed capillary refill and Doppler stroke volume of 50 mL. With heart rate and anesthetic conditions unchanged, 250 mL of fluid raises stroke volume to 62 mL, a 24% increase, and capillary refill improves. If perfusion remains inadequate and congestion is absent, this supports a further cautious aliquot with reassessment. After that aliquot, stroke volume changes only from 62 to 63 mL and perfusion does not improve. Repeated fluid now has little demonstrated benefit. Stop automatic boluses and evaluate other mechanisms, such as vasodilation after anesthetic deepening or impaired ventricular function; rising oxygen requirements or new pulmonary findings further argue against additional fluid.

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A recently anesthetized patient receiving oxygen is very somnolent and breathes shallowly despite a saturation of 99%. Assess and support ventilation and airway patency instead of concluding that respiratory recovery is adequate from saturation alone.

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After recovery from an unexpectedly difficult intubation, explain the event and document the effective device and technique, unsuccessful approaches and ventilation status. Give the patient usable information for future care rather than only recording that the airway was difficult.

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A patient with marked obesity and home CPAP has normal awake saturation. Prepare head-up preoxygenation before induction, then arrange head-up recovery, objective reversal assessment and access to prescribed CPAP rather than inferring adequate respiratory reserve from the starting saturation.

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A patient with severe hepatic disease has operative bleeding, multiple coagulation-factor deficiencies and low fibrinogen despite an adequate hemoglobin concentration. Consider the distinct roles of plasma and fibrinogen replacement; additional red cells do not directly correct those identified hemostatic deficits.

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An oncology patient has adequate hemoglobin but marked thrombocytopenia and mucosal bleeding before an invasive procedure. Identify the platelet-related hemostatic concern and coordinate procedural and component planning rather than treating normal hemoglobin as evidence that blood-related risk is low.

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A patient receiving cancer therapy has a low neutrophil count but preserved hemoglobin and platelets. Recognize the host-defense concern, assess for infection and maintain strict aseptic practices rather than assuming that the other blood counts demonstrate normal immune function.

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A term patient becomes hypotensive while supine during preparation for cesarean delivery. Ensure appropriate uterine displacement while assessing and treating the hemodynamic disturbance, rather than focusing only on the anesthetic drug as the possible cause.

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A clinician choosing between available spinal needles for cesarean anesthesia selects an appropriate pencil-point design to reduce headache risk. Explain the preventive rationale rather than assuming all needles of a similar gauge produce equivalent dural effects.

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During laparoscopic hernia repair, plateau pressure rises at unchanged tidal volume and end-tidal carbon dioxide gradually increases after insufflation. Reassess compliance, adjust effective ventilation and discuss insufflation conditions; verify tube position if ventilation becomes asymmetric.

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An older patient has hearing impairment, disrupted sleep and limited mobility after surgery. Restore hearing aids, support orientation and sleep, mobilize appropriately and review pain and medications rather than waiting for delirium before addressing these contributors.

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An older patient becomes acutely confused and pulls at lines after surgery. Evaluate oxygenation, pain and other contributors while protecting safety, rather than automatically giving a benzodiazepine without determining whether withdrawal or another specific indication is present.

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An adult with severe traumatic brain injury has mean arterial pressure 82 mm Hg and intracranial pressure 24 mm Hg. Calculate cerebral perfusion pressure as 58 mm Hg and recognize that it falls below the guideline target range.

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A severe-TBI patient has no current indication for an intracranial-pressure rescue maneuver. Avoid deliberately maintaining profound hypocapnia merely to keep intracranial pressure low, because the reduction in cerebral blood flow may compromise the intended protection.

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A stable patient continuing buprenorphine has substantial postoperative pain despite suitable nonopioid treatment. Reassess the cause, add appropriate regional or pharmacologic treatment and coordinate follow-up rather than automatically stopping maintenance therapy.

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A patient develops rapidly increasing neck swelling and stridor after thyroidectomy despite little drain output. Activate the emergency response and prepare immediate decompression and airway management rather than assuming an empty drain excludes bleeding.

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A relaxed child's tongue-related obstruction improves with jaw thrust and an appropriately selected airway adjunct. In contrast, persistent reflex glottic closure after stimulation requires pharmacologic treatment; exchanging an oral airway alone does not resolve that mechanism. Confirm airflow and ventilation after either intervention.

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A deeply sedated patient will undergo MRI with limited direct airway access. Confirm suitable monitoring and equipment, establish an airway rescue and patient-access plan, and check device conditions before scanning rather than transferring routine equipment without verification.