The correct answers are A. Prevent hypoxemia and C. Maintain airway patency.
This patient is showing signs of airway compromise:
Swelling around the mouth
Stridor # indicates upper airway obstruction
These findings strongly suggest a caustic ingestion with airway edema, which can rapidly progress to complete airway obstruction.
Priority: Airway and Breathing (ABCs)
According to NREMT principles, the highest priority is airway management and oxygenation.
1. Maintain airway patency (C):
Swelling and stridor indicate a narrowing airway
Immediate action is required to keep the airway open
Prepare for suctioning, positioning, and possible advanced airway support
2. Prevent hypoxemia (A):
Due to airway compromise, the patient is at high risk for inadequate oxygenation Administer high-flow oxygen and monitor closely NREMT-aligned guidance states:
"Airway compromise takes priority in caustic ingestions."
"Stridor indicates impending airway obstruction."
"Ensure airway patency and adequate oxygenation first."
Why the other options are incorrect:
B). Identify the chemicalImportant, but not the immediate priority over airway management D). Irrigate the affected areaMay be appropriate for external exposures, but airway takes priority here E). Administer activated charcoalContraindicated in caustic ingestions and in patients with airway compromise or vomiting risk Exact Extracts (NREMT-aligned EMT educational references):
"Airway management is the priority in patients with signs of airway compromise."
"Stridor is a sign of upper airway obstruction."
"Do not administer activated charcoal in caustic ingestions."
Clinical Priority Summary:
Because this patient shows airway swelling and stridor, the EMT must immediately focus on airway patency and oxygenation, making A and C the correct answers.
References:
NREMT EMT Education Standards - Medical Emergencies (Toxicology)
NREMT National Continued Competency Program (NCCP)
AAOS Emergency Care and Transportation of the Sick and Injured (NREMT-aligned)

The correct answer is C. Myocardial infarction.
This question describes classic signs and symptoms of acute coronary syndrome (ACS), specifically a myocardial infarction (heart attack). Key findings include:
Chest pain
Shortness of breath (dyspnea)
Cool, pale, diaphoretic skin
Feeling of impending doom
These are hallmark features emphasized in EMT education for recognizing cardiac emergencies.
According to standard NREMT-aligned EMT educational content, patients experiencing myocardial infarction often present with:
"Chest discomfort or pain... may be described as pressure, squeezing, or heaviness"
"Dyspnea (shortness of breath)"
"Diaphoresis (cool, clammy skin)"
"A feeling of impending doom"
These findings occur due to decreased cardiac output and sympathetic nervous system activation, which leads to sweating, anxiety, and vasoconstriction (cool skin).
Why the other options are incorrect:
A). Aortic aneurysm: Typically presents with sudden tearing pain (often in the back), not the classic ACS presentation with diaphoresis and impending doom.
B). Chronic bronchitis: A long-term respiratory condition characterized by cough and mucus production, not acute chest pain with diaphoresis.
D). Congestive heart failure: Usually presents with fluid overload symptoms such as edema, crackles, and dyspnea, but not typically acute crushing chest pain with diaphoresis and impending doom.
Exact Extracts (NREMT-aligned EMT educational references):
"Chest pain or discomfort... pressure, squeezing, or heaviness"
"Shortness of breath (dyspnea)"
"Skin may be pale, cool, and diaphoretic"
"Patient may have a feeling of impending doom"
These combined findings strongly indicate acute myocardial infarction, making C the most appropriate answer.
References:
NREMT EMT Education Standards - Cardiology & Resuscitation
NREMT National Continued Competency Program (NCCP) - Cardiac Emergencies Standard EMT Textbook (AAOS Emergency Care and Transportation of the Sick and Injured, aligned with NREMT)

The correct answer is B. Myocardial infarction.
Key findings in this scenario:
Elderly patient (80 years old)
History of diabetes
Sudden onset (1 hour)
Nausea, vomiting, fatigue, weakness
Normal blood glucose (130 mg/dL)
No focal neurological deficits (equal grips, symmetrical face)
Why Myocardial Infarction is correct:
Elderly and diabetic patients often present with atypical symptoms of myocardial infarction, such as:
Generalized weakness
Nausea and vomiting
Fatigue
Absence of chest pain ("silent MI")
NREMT-aligned references state:
"Elderly and diabetic patients may present with atypical signs of myocardial infarction."
"Symptoms may include weakness, nausea, vomiting, and fatigue without chest pain." Why the other options are incorrect:
A). Cerebral ischemia (stroke)# Typically presents with neurological deficits (facial droop, unequal grip), which are absent C). Dehydration# Usually more gradual onset, not sudden within 1 hour D). Influenza# Typically includes fever, body aches, respiratory symptoms, not isolated acute onset Exact Extracts (NREMT-aligned EMT educational references):
"Atypical presentations of MI are common in elderly and diabetic patients."
"Symptoms may include nausea, vomiting, fatigue, and weakness."
"Do not rely solely on chest pain to identify MI."
Clinical Priority Summary:
In elderly diabetic patients, sudden onset of weakness, nausea, and fatigue strongly suggests an atypical myocardial infarction, making B the correct answer.
References:
NREMT EMT Education Standards - Medical Emergencies (Cardiac)
NREMT National Continued Competency Program (NCCP)
AAOS Emergency Care and Transportation of the Sick and Injured (NREMT-aligned)

The correct answer is D because when the ambulance is first on scene at a roadway incident, it should be positioned to protect the scene, patient, and crew from oncoming traffic . National roadway incident safety guidance states that the initial-arriving emergency vehicle should be placed in a blocking position to oncoming traffic, and responder safety resources specifically note that if the ambulance is first on scene, use it as the initial block . This matches NREMT scene size-up and safety principles, where provider safety and scene protection come before patient contact. ( U.S. Fire Administration )

The correct answers are D. Place the device in the larger nostril and E. Lubricate the distal tip.
Proper insertion of a nasopharyngeal airway (NPA) follows specific steps outlined in NREMT-aligned airway management guidelines.
Correct Steps:
1. Choose the larger nostril (D):
The NPA should be inserted into the nostril with better airflow (larger nostril) to reduce resistance and trauma.
This improves ease of insertion and patient comfort.
2. Lubricate the distal tip (E):
The airway must be lubricated with a water-soluble lubricant before insertion.
This minimizes friction and reduces the risk of nasal mucosal injury or bleeding.
NREMT-aligned references state:
"Insert the NPA into the larger nostril when possible."
"Lubricate the airway prior to insertion."
Why the other options are incorrect:
A). Measure from the corner of the mouth to the tip of the ear # Incorrect This measurement is used for an oropharyngeal airway (OPA), not an NPA.
NPA is measured from nose to earlobe.
B). Follow the base of the tongue during insertion # Incorrect
This applies to OPA insertion, not NPA.
NPA is inserted along the floor of the nasal passage.
C). Insert the bevel away from the septum # Incorrect
The bevel should face toward the septum (medially), not away.
Exact Extracts (NREMT-aligned EMT educational references):
"Measure NPA from the nostril to the earlobe."
"Lubricate the airway before insertion."
"Insert into the larger nostril if possible."
"Advance gently along the nasal floor."
Clinical Priority Summary:
Correct NPA insertion requires proper nostril selection and lubrication, making D and E the correct answers.
References:
NREMT EMT Education Standards - Airway, Respiration & Ventilation
NREMT National Continued Competency Program (NCCP)
AAOS Emergency Care and Transportation of the Sick and Injured (NREMT-aligned)