AEMCA - Advanced Emergency Medical Care Assistant Airway Management and Ventilation Questions and Answers — Questions and Answers
Question 1: A 68-year-old male with a history of COPD is found in respiratory distress. He is obtunded, has a respiratory rate of 8 breaths per minute, and his skin is cyanotic. Waveform capnography shows a 'shark fin' appearance. What is the most likely cause of this waveform?
- Hyperventilation
- Esophageal intubation
- Bronchospasm (Correct answer)
- Pulmonary embolism
Correct answer: Bronchospasm
The 'shark fin' capnography waveform is characteristic of bronchospasm. This shape is caused by uneven and prolonged alveolar emptying due to airway obstruction, which is common in patients with COPD or asthma exacerbations. The upstroke of the waveform has a sloped appearance rather than the normal steep, almost vertical angle.
Question 2: When ventilating an apneic adult patient with an advanced airway in place, what is the correct ventilation rate according to current guidelines?
- 1 breath every 3-5 seconds (12-20 breaths/min)
- 1 breath every 6 seconds (10 breaths/min) (Correct answer)
- 1 breath every 8-10 seconds (6-8 breaths/min)
- 1 breath every 2-3 seconds (20-30 breaths/min)
Correct answer: 1 breath every 6 seconds (10 breaths/min)
According to the most recent CPR and ECC guidelines, when an advanced airway (such as an endotracheal tube or supraglottic airway) is in place, ventilations should be delivered at a rate of 1 breath every 6 seconds, which equates to 10 breaths per minute for an adult patient. This avoids the complications of hyperventilation.
Question 3: Which of the following is considered the most reliable method for confirming initial and ongoing placement of an endotracheal tube in a patient with a perfusing rhythm?
- Bilateral breath sounds on auscultation
- Condensation in the endotracheal tube
- Continuous waveform capnography (Correct answer)
- Use of an esophageal detector device (EDD)
Correct answer: Continuous waveform capnography
Continuous waveform capnography is the gold standard for confirming and monitoring endotracheal tube placement. It provides real-time, breath-to-breath analysis of expired CO2, which is the most reliable indicator that the tube is in the trachea and not the esophagus. Other methods like auscultation, chest rise, and EDD are useful secondary confirmation techniques but are not as definitive.
Question 4: You are managing a patient following a traumatic injury and suspect a cervical spine injury. The patient is unconscious and requires airway management. Which manual maneuver is most appropriate for opening the airway in this patient?
- Head-tilt, chin-lift
- Jaw-thrust maneuver (Correct answer)
- Flexion of the neck
- Head-tilt, neck-lift
Correct answer: Jaw-thrust maneuver
In a patient with a suspected cervical spine injury, the jaw-thrust maneuver is the recommended technique for opening the airway. This method avoids extending or flexing the neck, minimizing the risk of exacerbating a potential spinal cord injury. The head-tilt, chin-lift is contraindicated in this scenario.
Question 5: A paramedic has made three unsuccessful attempts at endotracheal intubation on an apneic patient. Oxygen saturation is being maintained at 94% with bag-valve-mask ventilation between attempts. According to difficult airway algorithms, what is the appropriate next step?
- Attempt intubation a fourth time using a different blade
- Declare a failed airway and proceed to a rescue airway device (e.g., SGA) (Correct answer)
- Perform an emergency cricothyrotomy immediately
- Continue BVM ventilation and transport rapidly
Correct answer: Declare a failed airway and proceed to a rescue airway device (e.g., SGA)
A failed airway is often defined as three unsuccessful intubation attempts by an experienced provider. Since oxygenation is currently being maintained, the next step is not an immediate surgical airway but rather moving to a rescue airway strategy, such as inserting a supraglottic airway (SGA) like a King LT or LMA. This secures the airway less invasively while providing effective ventilation.
Question 6: What is the primary purpose of using a nasopharyngeal airway (NPA)?
- To isolate the trachea for endotracheal intubation
- To bypass upper airway obstruction at the level of the tongue in a patient with a gag reflex (Correct answer)
- To provide a definitive, long-term airway in an unresponsive patient
- To prevent aspiration of gastric contents
Correct answer: To bypass upper airway obstruction at the level of the tongue in a patient with a gag reflex
A nasopharyngeal airway is a basic airway adjunct used to bypass the tongue as a source of obstruction in the oropharynx. It is particularly useful in patients who are semiconscious and may still have an intact gag reflex, which would make an oropharyngeal airway (OPA) intolerable.
AEMCA - Advanced Emergency Medical Care Assistant Airway Management and Ventilation Questions and Answers
A 68-year-old male with a history of COPD is found in respiratory distress.
He is obtunded, has a respiratory rate of 8 breaths per minute, and his skin is cyanotic.
Waveform capnography shows a 'shark fin' appearance.
What is the most likely cause of this waveform?