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Question 1Advanced Airway Management

Which neuromuscular blocking agent is classified as a depolarizing agent?

  1. Rocuronium
  2. Cisatracurium
  3. Vecuronium
  4. Succinylcholine Correct answer.

Explanation

Succinylcholine binds acetylcholine receptors at the motor endplate and produces sustained depolarization, so it is the only depolarizing blocker used in rapid sequence intubation. The other agents competitively block the receptor without depolarizing it.

Question 2Advanced Airway Management

A Mallampati class III oropharyngeal view corresponds to which finding?

  1. Hard palate only
  2. Soft palate, fauces, and uvula
  3. Soft palate and base of uvula only Correct answer.
  4. Soft palate, fauces, uvula, and tonsillar pillars

Explanation

The Mallampati classification grades visibility of oropharyngeal structures with the patient seated, mouth open, and tongue protruded; class III is limited to the soft palate and base of uvula. Higher classes correlate with greater difficulty achieving a glottic view.

Question 3Advanced Airway Management

Which method provides the most reliable confirmation and continuous monitoring of endotracheal tube position?

  1. A single portable chest radiograph
  2. Condensation forming inside the tube
  3. Continuous waveform capnography Correct answer.
  4. Auscultation of equal bilateral breath sounds

Explanation

Continuous waveform capnography detects exhaled CO2 breath by breath and is the standard for confirming and continuously monitoring tube position, including immediate recognition of dislodgement. It is the only method that remains reliable as the patient moves or is transported.

Question 4Advanced Airway Management

A Cormack-Lehane grade I laryngoscopic view is defined as which of the following?

  1. The epiglottis is visible but the vocal cords are not
  2. Only the epiglottis can be visualized
  3. Only the soft palate can be visualized
  4. Both vocal cords and the glottic opening are fully visible Correct answer.

Explanation

The Cormack-Lehane system grades the best glottic view obtained at laryngoscopy: grade I shows the entire glottic opening with both cords. Grades II through IV describe progressively poorer views, with grade IV showing only the soft palate.

Question 5Advanced Airway Management

A cricothyrotomy is performed through the membrane located between which two structures?

  1. Hyoid bone and thyroid cartilage
  2. Cricoid cartilage and first tracheal ring
  3. Second and third tracheal rings
  4. Thyroid cartilage and cricoid cartilage Correct answer.

Explanation

The cricothyroid membrane lies between the thyroid cartilage above and the cricoid cartilage below; it is superficial and relatively avascular, making it the standard site for emergency surgical airway access. Entering below the cricoid risks esophageal or mediastinal injury.

Question 6Advanced Airway Management

Using the formula (age in years / 4) + 4, what uncuffed endotracheal tube internal diameter is estimated for a 4-year-old child?

  1. 5.0 mm Correct answer.
  2. 6.5 mm
  3. 3.0 mm
  4. 7.0 mm

Explanation

The pediatric sizing formula divides age by four and adds four, giving 5.0 mm for a 4-year-old. The tube should then be confirmed by auscultation, leak assessment, and capnography rather than by formula alone.

Question 7Advanced Airway Management

A patient with 40% total body surface area burns sustained five days ago requires rapid sequence intubation. Which paralytic should be avoided?

  1. Ketamine
  2. Etomidate
  3. Rocuronium
  4. Succinylcholine Correct answer.

Explanation

After major burns, extrajunctional acetylcholine receptors proliferate and succinylcholine triggers a massive potassium efflux that can cause hyperkalemic cardiac arrest. The risk begins about 24 to 48 hours after the burn and may persist for up to one to two years.

Question 8Advanced Airway Management

Which problem is the principal disadvantage of etomidate when used to induce a patient in septic shock?

  1. Adrenal suppression that can worsen sepsis Correct answer.
  2. Profound hypotension from direct myocardial depression
  3. Prolonged paralysis requiring reversal
  4. Bronchospasm from histamine release

Explanation

Etomidate inhibits 11-beta-hydroxylase and suppresses cortisol synthesis, and even a single induction dose has been associated with adrenal insufficiency and worse outcomes in septic shock. Its hemodynamic stability is otherwise excellent, which is why the trade-off must be weighed.

Question 9Advanced Airway Management

Which induction agent is favored for a patient in severe status asthmaticus who requires intubation?

  1. Etomidate
  2. Ketamine Correct answer.
  3. Midazolam
  4. Propofol

Explanation

Ketamine produces bronchodilation through catecholamine release and is a common choice in refractory bronchospasm, while preserving respiratory drive and blood pressure. Propofol and benzodiazepines lack bronchodilating effects and can worsen hypotension.

Question 10Advanced Airway Management

In the LEMON difficult-airway assessment, the component evaluated by the 3-3-2 rule is which of the following?

  1. Mouth opening, mandibular size, and hyoid-to-thyroid distance Correct answer.
  2. Thyromental distance in fingerbreadths and neck range of motion
  3. Mallampati class and dentition
  4. Thyromental distance and neck circumference

Explanation

The 3-3-2 rule assesses three fingerbreadths of mouth opening, three fingerbreadths of mandibular length (hyoid to mentum), and two fingerbreadths from hyoid to thyroid notch. These measurements estimate whether the larynx can be exposed with a laryngoscope.

Question 11Advanced Airway Management

Apneic oxygenation during laryngoscopy is best achieved by which intervention?

  1. 15 L/min by nasal cannula during laryngoscopy Correct answer.
  2. Applying PEEP through a nonrebreather mask
  3. Ventilating between attempts at 30 breaths per minute
  4. Hyperventilating to an ETCO2 of 25 mmHg before induction

Explanation

Oxygen continues to be taken up from the alveoli while the patient is apneic, so a high-flow nasal cannula maintains alveolar oxygen and slows desaturation during intubation attempts. It does not remove CO2, so it prolongs safe apnea time rather than replacing ventilation.

Question 12Advanced Airway Management

Fifteen minutes after intubation, ETCO2 falls abruptly from 38 mmHg to 6 mmHg with loss of the waveform and falling SpO2. What is the most appropriate first action?

  1. Deepen sedation and reassess in two minutes
  2. Verify tube position and assess for dislodgement Correct answer.
  3. Increase the FiO2 to 100% and continue monitoring
  4. Assume pneumothorax and perform needle decompression

Explanation

An abrupt loss of waveform and near-zero ETCO2 suggests the tube is no longer in the trachea, so displacement must be checked first. The DOPE mnemonic orders the differential as Displacement, Obstruction, Pneumothorax, and Equipment failure.

Question 13Advanced Airway Management

Which statement about supraglottic airway devices is accurate?

  1. They do not reliably protect against aspiration Correct answer.
  2. They are preferred for ventilation lasting longer than 24 hours
  3. They provide a reliable seal at pressures above 40 cmH2O
  4. They protect against aspiration as well as an endotracheal tube

Explanation

Supraglottic devices sit above the glottis and do not seal the trachea, so regurgitated material can still enter the airway. They are rescue and temporizing devices, not definitive airways for prolonged ventilation.

Question 14Advanced Airway Management

A patient with facial burns, singed nasal hairs, carbonaceous sputum, and new stridor needs airway management. What is the best approach?

  1. Intubate early, before edema progresses Correct answer.
  2. Start nebulized epinephrine and observe for six hours
  3. Await serial examinations and intubate only if SpO2 falls
  4. Place a supraglottic airway and transport

Explanation

Inhalation injury produces progressive airway edema that can rapidly convert a manageable airway into an impossible one, so intubation is performed early when signs such as stridor and carbonaceous sputum are present. Waiting for hypoxemia signals a much harder laryngoscopy.

Question 15Advanced Airway Management

During intubation of a trauma patient with a suspected unstable cervical spine injury, the recommended technique is which of the following?

  1. Manual in-line stabilization with minimal cervical extension Correct answer.
  2. Removal of the collar with application of axial traction
  3. Full sniffing position to improve the glottic view
  4. Blind nasotracheal intubation

Explanation

Manual in-line stabilization limits lateral and rotational movement while allowing the small degree of extension needed for laryngoscopy. Traction and extreme positioning risk distracting an unstable column.

Question 16Advanced Airway Management

Which approach best reflects current practice for sedation after intubation?

  1. Intermittent midazolam boluses given only when the patient moves
  2. Continuous paralysis for 24 hours without sedation
  3. Analgesia-based sedation titrated to a sedation scale Correct answer.
  4. Propofol infusion alone at a deep sedating dose

Explanation

Guidelines support an analgesia-first, multimodal approach with the sedative titrated to a validated scale such as RASS, which reduces cumulative drug dose and duration of ventilation. Pain is the most common driver of agitation in the intubated patient.

Question 17Advanced Airway Management

Delayed sequence intubation (DSI) in a hypoxic, agitated patient is best described as which of the following?

  1. Giving the paralytic first, then the induction agent
  2. Skipping preoxygenation to shorten the apnea time
  3. Withholding sedation until after the tube is placed
  4. Ketamine dissociation to permit preoxygenation, then induction Correct answer.

Explanation

DSI uses a dissociative dose of ketamine to treat the agitation that prevents preoxygenation, allowing several minutes of effective denitrogenation before the induction agent and paralytic are given. The ketamine is a procedural sedative here, not the induction dose.

Question 18Advanced Airway Management

Which ventilator settings are most consistent with lung-protective ventilation after intubation of a patient with ARDS?

  1. 4 mL/kg predicted body weight with permissive hyperoxia
  2. 10-12 mL/kg actual body weight, plateau pressure < 45 cmH2O
  3. 12 mL/kg actual body weight with peak pressures < 50 cmH2O
  4. 6-8 mL/kg predicted body weight, plateau pressure < 30 cmH2O Correct answer.

Explanation

Lung-protective ventilation uses tidal volumes based on predicted body weight and limits plateau pressure to reduce volutrauma and barotrauma. Permissive hypercapnia is preferred over high pressures.

Question 19Advanced Airway Management

After multiple intubation attempts, a patient is at SpO2 60% and cannot be oxygenated with bag-valve-mask or a supraglottic airway. What is the appropriate next step?

  1. Perform an immediate surgical cricothyrotomy Correct answer.
  2. Attempt direct laryngoscopy once more with a different blade
  3. Give additional paralytic and wait for conditions to improve
  4. Place the patient in Trendelenburg and continue bagging

Explanation

A cannot-intubate, cannot-oxygenate situation is an absolute indication for an immediate front-of-neck airway; further attempts cause worsening hypoxemia and cardiac arrest. Surgical cricothyrotomy is the preferred technique in adults.

Question 20Advanced Airway Management

Which physiologic change of pregnancy most increases the risk of rapid desaturation during rapid sequence intubation?

  1. Decreased oxygen consumption
  2. Reduced functional residual capacity with increased oxygen consumption Correct answer.
  3. Increased functional residual capacity
  4. Increased chest wall compliance raising tidal volumes

Explanation

By term, functional residual capacity falls roughly 20% while oxygen consumption rises 20-30%, so the oxygen reservoir is smaller and consumed faster. Closing capacity also encroaches on FRC, making apnea time very short and thorough preoxygenation essential.

Question 21Assessment and Diagnostics

A patient's eyes open spontaneously, the patient is oriented and conversant, and the patient follows motor commands. What Glasgow Coma Scale score does this represent?

  1. 13
  2. 14
  3. 15 Correct answer.
  4. 12

Explanation

The GCS sums the best eye response (4, spontaneous), best verbal response (5, oriented), and best motor response (6, obeys commands) for a total of 15.

Question 22Assessment and Diagnostics

A patient with smoke inhalation has an SpO2 of 99% on room air but appears confused. Which condition most likely explains a falsely reassuring pulse oximetry reading?

  1. Fetal hemoglobin
  2. Methemoglobinemia
  3. Hyperbilirubinemia
  4. Carboxyhemoglobinemia Correct answer.

Explanation

Carboxyhemoglobin absorbs light at wavelengths similar to oxyhemoglobin, so standard pulse oximeters overestimate arterial oxygen saturation in carbon monoxide poisoning; co-oximetry is required.

Question 23Assessment and Diagnostics

What is the normal end-tidal CO2 range for a healthy, spontaneously breathing adult?

  1. 45 to 55 mmHg
  2. 25 to 35 mmHg
  3. 35 to 45 mmHg Correct answer.
  4. 20 to 30 mmHg

Explanation

In a healthy adult with normal dead space and pulmonary perfusion, end-tidal CO2 approximates arterial PaCO2 at 35 to 45 mmHg.

Question 24Assessment and Diagnostics

Which shock index value in an adult trauma patient most suggests occult hypoperfusion despite a blood pressure within normal limits?

  1. 1.0 Correct answer.
  2. 0.6
  3. 0.5
  4. 0.7

Explanation

Shock index is heart rate divided by systolic blood pressure; normal is roughly 0.5 to 0.7, and values of 0.9 or greater suggest occult shock even when the blood pressure appears acceptable.

Question 25Assessment and Diagnostics

A patient presents with a respiratory rate of 6 breaths/min, pinpoint pupils, and depressed mental status. Which cause is most likely?

  1. Hypoglycemia
  2. Anticholinergic toxicity
  3. Sympathomimetic toxicity
  4. Opioid overdose Correct answer.

Explanation

The triad of slow respirations, miosis, and altered mental status is classic for opioid toxicity, and naloxone is the antidote.

Question 26Assessment and Diagnostics

After blunt chest trauma, a hypotensive patient has absent breath sounds and hyperresonance on the right, with tracheal deviation to the left. What is the most likely diagnosis?

  1. Massive pulmonary contusion
  2. Cardiac tamponade
  3. Flail chest
  4. Tension pneumothorax Correct answer.

Explanation

Unilateral absent breath sounds with hyperresonance, tracheal deviation away from the affected side, and hypotension indicate tension pneumothorax, which requires immediate needle decompression.

Question 27Assessment and Diagnostics

An arterial blood gas shows pH 7.28, PaCO2 58 mmHg, and HCO3 26 mEq/L. How should this be interpreted?

  1. Acute respiratory acidosis Correct answer.
  2. Metabolic acidosis
  3. Respiratory alkalosis
  4. Compensated metabolic alkalosis

Explanation

Acidemia with an elevated PaCO2 and a bicarbonate that is not elevated defines an acute respiratory acidosis, because renal compensation has not yet developed.

Question 28Assessment and Diagnostics

ST-segment elevation in leads II, III, and aVF localizes injury to which region, and which artery is most commonly involved?

  1. Inferior wall; RCA Correct answer.
  2. Septal wall; LAD
  3. Lateral wall; circumflex
  4. Anterior wall; LAD

Explanation

Leads II, III, and aVF view the inferior wall, which is most often supplied by the right coronary artery, and reciprocal depression may appear in leads I and aVL.

Question 29Assessment and Diagnostics

During a FAST examination, which window is used to assess Morison's pouch?

  1. Right upper quadrant Correct answer.
  2. Pelvic
  3. Left upper quadrant (splenorenal)
  4. Subxiphoid

Explanation

Morison's pouch, the hepatorenal recess, is imaged in the right upper quadrant window and is a common site for early detection of free intraperitoneal fluid.

Question 30Assessment and Diagnostics

A hypotensive trauma patient has a central venous pressure of 2 mmHg. Which condition does this finding most support?

  1. Right heart failure
  2. Cardiac tamponade
  3. Hypovolemia Correct answer.
  4. Tension pneumothorax

Explanation

A low CVP indicates reduced preload, consistent with hemorrhage or another cause of hypovolemia, whereas the other listed conditions typically elevate CVP.

Question 31Assessment and Diagnostics

A patient's blood pressure is 90/50 mmHg. What is the mean arterial pressure?

  1. 63 mmHg Correct answer.
  2. 70 mmHg
  3. 60 mmHg
  4. 58 mmHg

Explanation

MAP is calculated as (SBP + 2 x DBP) divided by 3, which here is (90 + 100) divided by 3, or 63 mmHg.

Question 32Assessment and Diagnostics

A capnogram shows a progressively upsloping plateau shaped like a shark fin. What does this waveform indicate?

  1. Hyperventilation with a steep upstroke
  2. Cuff leak around the endotracheal tube
  3. Cardiac oscillations superimposed on the tracing
  4. Obstructive bronchospasm Correct answer.

Explanation

The shark-fin pattern reflects uneven alveolar emptying caused by airflow obstruction, as seen in asthma or COPD.

Question 33Assessment and Diagnostics

Which three variables make up the Revised Trauma Score?

  1. GCS, age, and injury severity score (ISS)
  2. GCS, systolic BP, and respiratory rate Correct answer.
  3. Respiratory rate, SpO2, and GCS
  4. Systolic BP, heart rate, and GCS

Explanation

The Revised Trauma Score uses coded values of the Glasgow Coma Scale, systolic blood pressure, and respiratory rate, which are weighted and summed.

Question 34Assessment and Diagnostics

In the LEMON airway assessment, what does the letter M represent?

  1. Mouth opening
  2. Mobility of the neck
  3. Mandible length
  4. Mallampati score Correct answer.

Explanation

LEMON stands for Look externally, Evaluate the 3-3-2 rule, Mallampati score, Obstruction, and Neck mobility.

Question 35Assessment and Diagnostics

A head-injured patient has a blood pressure of 190/70 mmHg, a heart rate of 48 beats/min, and irregular respirations. What do these findings indicate?

  1. Spinal shock
  2. Raised ICP Correct answer.
  3. Neurogenic shock
  4. Refractory septic shock

Explanation

Hypertension with a widened pulse pressure, bradycardia, and irregular respirations constitute Cushing's triad, a sign of rising intracranial pressure and impending herniation.

Question 36Assessment and Diagnostics

Which three components make up the pediatric assessment triangle?

  1. Appearance, work of breathing, circulation to skin Correct answer.
  2. Airway patency, breathing effort, and circulatory status
  3. Level of consciousness, pupil size, and posturing
  4. Pulse strength, motor response, and sensory level

Explanation

The pediatric assessment triangle is a rapid visual and auditory assessment built from appearance, work of breathing, and circulation to the skin.

Question 37Assessment and Diagnostics

An arterial blood gas shows pH 7.22, PaCO2 28 mmHg, and HCO3 11 mEq/L. Using Winter's formula, how should the respiratory compensation be described?

  1. Appropriate respiratory compensation
  2. Concurrent metabolic alkalosis
  3. Concurrent respiratory acidosis Correct answer.
  4. Concurrent respiratory alkalosis

Explanation

Winter's formula predicts a PaCO2 of 1.5 x 11 + 8 = 24.5, plus or minus 2 mmHg, or roughly 22.5 to 26.5; the measured 28 mmHg is higher than expected, so an additional respiratory acidosis is present.

Question 38Assessment and Diagnostics

Which finding in a patient with a left bundle branch block satisfies the original Sgarbossa criteria for acute myocardial infarction?

  1. Isolated ST depression in lead V5 with a positive QRS
  2. Concordant ST elevation of 1 mm or more with a positive QRS Correct answer.
  3. New Q waves confined to leads V4 through V6
  4. Discordant ST elevation of 2 mm in V2 with a deep S wave

Explanation

Original Sgarbossa criteria include concordant ST elevation of at least 1 mm in leads with a positive QRS, concordant ST depression of at least 1 mm in V1 through V3, and discordant ST elevation of at least 5 mm.

Question 39Assessment and Diagnostics

A normotensive trauma patient with tachycardia has a serum lactate of 4.2 mmol/L. What does this most likely indicate?

  1. Occult hypoperfusion Correct answer.
  2. Isolated hepatic dysfunction
  3. Expected finding after exertion
  4. Sample error requiring repeat testing

Explanation

Elevated lactate in a trauma patient with normal blood pressure reflects inadequate tissue perfusion and predicts higher mortality, so it should prompt reassessment and treatment rather than dismissal.

Question 40Assessment and Diagnostics

A patient in septic shock has a central venous oxygen saturation (ScvO2) of 55%. What is the most likely interpretation?

  1. Arterial saturation is normal so there is no concern
  2. Oxygen delivery is inadequate relative to demand Correct answer.
  3. The catheter has migrated into the arterial circulation
  4. Adequate oxygen delivery with increased oxygen demand

Explanation

An ScvO2 below about 70% indicates increased oxygen extraction because delivery is inadequate for metabolic demand, a common finding in septic shock.

Question 41Flight Physiology and Environmental Considerations

A helicopter ascends from sea level to 10,000 ft without pressurization. According to Boyle's law, which change occurs in a gas-filled space such as the middle ear?

  1. The gas volume increases as ambient pressure falls. Correct answer.
  2. The gas volume rises only with temperature.
  3. The gas volume decreases as ambient pressure falls.
  4. The gas volume stays constant while pressure falls.

Explanation

Boyle's law states that at a constant temperature the volume of a gas is inversely proportional to the surrounding pressure. As the aircraft climbs, barometric pressure falls and any trapped gas expands. This principle explains why gas in the middle ear, sinuses, and bowel expands during ascent.

Question 42Flight Physiology and Environmental Considerations

At altitude, the percentage of oxygen in the atmosphere remains about 21%, yet hypoxia develops. Which principle explains this?

  1. Charles's law of gas expansion
  2. Henry's law relating gas to liquid solubility
  3. Dalton's law of partial pressures Correct answer.
  4. Graham's law of diffusion rates

Explanation

Dalton's law states that the total pressure of a gas mixture is the sum of the partial pressures of its components. Although oxygen remains 21% of the mixture, the falling barometric pressure lowers the partial pressure of oxygen and therefore alveolar oxygen tension. This is why hypoxia occurs despite a constant fractional concentration.

Question 43Flight Physiology and Environmental Considerations

Which situation best illustrates Henry's law as it applies to flight physiology?

  1. An oxygen cylinder cooling as it is emptied
  2. Nitrogen bubbles after rapid decompression Correct answer.
  3. A sinus block developing during a rapid descent
  4. Expansion of trapped bowel gas during climb

Explanation

Henry's law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas above the liquid. A rapid fall in ambient pressure reduces nitrogen's solubility in blood and tissues, allowing bubbles to form. This is the mechanism behind altitude decompression sickness.

Question 44Flight Physiology and Environmental Considerations

At approximately 35,000 ft, after a sudden loss of cabin pressure, the time of useful consciousness is closest to:

  1. 10 to 15 seconds
  2. 5 to 10 minutes
  3. 30 to 60 seconds Correct answer.
  4. 2 to 3 minutes

Explanation

Time of useful consciousness falls sharply as altitude increases because alveolar oxygen tension drops with barometric pressure. At about 35,000 ft, a crew member has roughly 30 to 60 seconds before becoming incapacitated. This is why rapid donning of oxygen equipment is critical.

Question 45Flight Physiology and Environmental Considerations

Which type of hypoxia is the primary concern for a crew member breathing cabin air at high altitude?

  1. Hypoxic hypoxia Correct answer.
  2. Histotoxic hypoxia
  3. Stagnant hypoxia
  4. Anemic hypoxia

Explanation

Hypoxic hypoxia results from a reduced partial pressure of oxygen reaching the lungs and blood. At altitude this occurs even when the fractional concentration of oxygen is normal, because barometric pressure is low. The other forms involve impaired oxygen-carrying capacity, circulation, or cellular use.

Question 46Flight Physiology and Environmental Considerations

A crew member at altitude reports dizziness, tingling in the fingers, and a feeling of breathlessness. The patient's oxygen saturation is 98% on room air and breathing is rapid and deep. What is the most likely cause?

  1. Decompression sickness
  2. Hypoxic hypoxia from altitude exposure
  3. Hyperventilation with hypocapnia Correct answer.
  4. Carbon monoxide poisoning

Explanation

Rapid deep breathing washes out carbon dioxide, producing hypocapnia with perioral and digital tingling, dizziness, and a sense of breathlessness. A normal oxygen saturation and rapid respiratory rate point toward hyperventilation rather than hypoxia. Hypoxia would typically be accompanied by a low saturation reading.

Question 47Flight Physiology and Environmental Considerations

A crew member who completed a scuba dive 12 hours ago develops joint pain and mottled skin after a flight at 8,000 ft cabin altitude. What is the most appropriate action?

  1. Heat application to the painful joints
  2. 100% oxygen and urgent hyperbaric referral Correct answer.
  3. Intravenous fluids and continued observation
  4. Return to a lower cabin altitude and monitor

Explanation

These findings suggest altitude decompression sickness, in which dissolved nitrogen comes out of solution as bubbles. Treatment is high-flow oxygen, minimizing further altitude exposure, and urgent hyperbaric recompression. Continued flight at altitude allows bubbles to expand and worsens the injury.

Question 48Flight Physiology and Environmental Considerations

During a descent, a patient with an upper respiratory infection reports severe ear pain and decreased hearing. Which action is most appropriate?

  1. Increase the descent rate to shorten exposure
  2. Have the patient lie flat and administer a sedative
  3. Instill decongestant drops and continue the descent
  4. Slow descent and have the patient Valsalva Correct answer.

Explanation

Ear pain and hearing loss during descent indicate a middle ear pressure block from eustachian tube dysfunction. Slowing the descent and using equalization maneuvers such as Valsalva allows pressure to equalize and reduces the risk of tympanic membrane injury. Rapid continued descent can worsen the barotrauma.

Question 49Flight Physiology and Environmental Considerations

Which symptom pattern most suggests barotrauma of the paranasal sinuses during ascent?

  1. Chest tightness and cough
  2. Numbness in the fingers and lips
  3. Unilateral hearing loss with vertigo
  4. Frontal pressure pain during climb Correct answer.

Explanation

Sinus barotrauma produces pain over the affected sinus, most often frontal or maxillary, as trapped gas expands or contracts against a blocked ostium. The pain typically occurs during ascent or descent and may be accompanied by epistaxis. Hearing loss and vertigo point toward the middle ear rather than the sinuses.

Question 50Flight Physiology and Environmental Considerations

During a steep turn, a crew member experiences graying of vision. Which physiologic mechanism is responsible?

  1. Blood pooling in the legs reducing retinal flow Correct answer.
  2. Hyperventilation-induced hypocapnia
  3. Increased cerebral blood flow from venous pooling
  4. Hypoxia from reduced alveolar oxygen

Explanation

Positive Gz acceleration drives blood toward the lower body, reducing venous return and arterial pressure at eye level. The retina is sensitive to this fall in perfusion, producing grayout before consciousness is lost. Muscle tensing and anti-G maneuvers counteract the effect.