EMT-I Emergency Medical Technician Intermediate
Updated 2026 | Comprehensive Study Guide, Practice
Exam Questions and Answers, Exam Prep Test Bank,
Prehospital Emergency Care, Patient Assessment and
Trauma Management, Airway and Breathing
Interventions, Cardiac Emergencies and CPR
Protocols, Pharmacology for EMTs, EMS Operations
and Safety Procedures, and Detailed Rationales for
Certification Success
Question 1: A 45-year-old male with a history of hypertension complains of sudden,
severe chest pain radiating to his back. His blood pressure is 180/110 mmHg in the
right arm and 100/70 mmHg in the left arm. What is the most likely diagnosis?
A. Acute Myocardial Infarction
B. Pulmonary Embolism
C. Aortic Dissection
D. Pericarditis
CORRECT ANSWER: C. Aortic Dissection
Rationale: Aortic dissection often presents with sudden, severe, tearing chest or back
pain and can cause asymmetric blood pressures in the upper extremities due to
differential involvement of the brachiocephalic vessels. This presentation is classic and
should be the primary differential.
Question 2: In a patient with severe anaphylaxis, what is the primary
pharmacologic intervention and its mechanism of action?
A. Diphenhydramine; blocks histamine H1 receptors
B. Albuterol; beta-2 agonist for bronchodilation
C. Epinephrine; alpha and beta agonist causing vasoconstriction and bronchodilation
D. Methylprednisolone; reduces late-phase inflammation
CORRECT ANSWER: C. Epinephrine; alpha and beta agonist causing
vasoconstriction and bronchodilation
Rationale: Epinephrine is the drug of choice for anaphylaxis. Its alpha-adrenergic
effects reverse peripheral vasodilation and hypotension, while its beta-2 effects reverse
bronchospasm. Corticosteroids and antihistamines are adjunctive treatments.
Question 3: Which ECG finding is most consistent with hyperkalemia?
A. Peaked T-waves
B. U-waves
,C. Prolonged QT interval
D. ST-segment depression
CORRECT ANSWER: A. Peaked T-waves
Rationale: Tall, peaked, symmetrical T-waves are an early and classic ECG sign of
hyperkalemia. As potassium levels rise, the ECG can progress to widened QRS
complexes and sine-wave patterns. U-waves are associated with hypokalemia.
Question 4: When managing a tension pneumothorax, where should the needle
decompression be performed?
A. Midaxillary line, 4th or 5th intercostal space
B. Midclavicular line, 2nd intercostal space
C. Midsternal line, 1st intercostal space
D. Posterior axillary line, 6th intercostal space
CORRECT ANSWER: B. Midclavicular line, 2nd intercostal space
Rationale: The standard location for needle decompression is the 2nd intercostal
space at the midclavicular line. This approach minimizes the risk of hitting the heart or
major vessels, which are more central.
Question 5: A patient with a spinal cord injury at the C6 level would likely retain
function of which muscle group?
A. Diaphragm
B. Biceps
C. Wrist extensors
D. Intercostals
CORRECT ANSWER: C. Wrist extensors
Rationale: A C6 injury generally results in preserved shoulder abduction, elbow flexion
(biceps), and wrist extension. The diaphragm (C3-C5) and intercostals (T1-T12) are not
innervated by C6.
Question 6: What is the most likely acid-base disturbance in a patient with a 3-day
history of vomiting?
A. Respiratory acidosis
B. Metabolic acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis
CORRECT ANSWER: C. Metabolic alkalosis
,Rationale: Vomiting results in the loss of gastric hydrochloric acid, leading to a net gain
of bicarbonate in the blood, causing metabolic alkalosis. This is a common cause of
hypochloremic metabolic alkalosis.
Question 7: In the context of cardiogenic shock, which hemodynamic parameter is
most indicative of the condition?
A. Decreased pulmonary capillary wedge pressure (PCWP)
B. Increased cardiac output
C. Increased PCWP and decreased cardiac output
D. Decreased systemic vascular resistance (SVR)
CORRECT ANSWER: C. Increased PCWP and decreased cardiac output
Rationale: Cardiogenic shock is characterized by pump failure, leading to increased
ventricular filling pressures (PCWP) and a significant reduction in cardiac output. SVR is
typically elevated as a compensatory mechanism.
Question 8: A patient with a history of COPD presents with respiratory distress.
Which oxygen delivery device provides the most precise and consistent FiO2?
A. Nasal cannula
B. Non-rebreather mask
C. Venturi mask
D. Simple face mask
CORRECT ANSWER: C. Venturi mask
Rationale: The Venturi mask uses the Venturi principle to entrain air and deliver a
precise, fixed concentration of oxygen. It is the most reliable device for patients with
COPD who require controlled oxygen therapy to avoid suppressing their hypoxic drive.
Question 9: During a cardiac arrest, a patient presents with a shockable rhythm.
What is the appropriate energy dose for a biphasic defibrillator?
A. 120-200 Joules
B. 200-300 Joules
C. 360 Joules
D. 50-100 Joules
CORRECT ANSWER: A. 120-200 Joules
Rationale: The recommended initial dose for biphasic defibrillation is between 120-200
Joules. For monophasic defibrillators, the standard is 360 Joules. The 120-200 J range is
effective and minimizes myocardial damage.
, Question 10: What is the primary neurological deficit associated with a stroke
affecting the left middle cerebral artery?
A. Left-sided hemiplegia and neglect
B. Right-sided hemiplegia and aphasia
C. Bilateral blindness
D. Ataxia and diplopia
CORRECT ANSWER: B. Right-sided hemiplegia and aphasia
Rationale: The left middle cerebral artery supplies the motor cortex and
Broca's/Wernicke's areas. Infarction leads to contralateral (right-sided) hemiplegia and
aphasia (speech deficits) in right-handed individuals.
Question 11: Which of the following IV fluids is most appropriate for a patient with
severe traumatic brain injury and hypotension?
A. 0.9% Normal Saline
B. 0.45% Normal Saline
C. D5W
D. 3% Hypertonic Saline
CORRECT ANSWER: A. 0.9% Normal Saline
Rationale: In TBI with hypotension, the goal is to restore perfusion without causing
cerebral edema. Isotonic crystalloids like Normal Saline are preferred as they do not
cause osmotic shifts. Hypertonic saline may be used in specific protocols, but normal
saline is the standard initial resuscitative fluid.
Question 12: What is the most common cause of upper airway obstruction in an
unresponsive patient?
A. Foreign body aspiration
B. Laryngeal edema
C. Tongue obstruction
D. Epiglottitis
CORRECT ANSWER: C. Tongue obstruction
Rationale: In an unresponsive patient, the loss of muscle tone allows the tongue to fall
back against the posterior pharyngeal wall, causing the most common form of airway
obstruction. This is managed with the head-tilt/chin-lift or jaw-thrust maneuver.
Updated 2026 | Comprehensive Study Guide, Practice
Exam Questions and Answers, Exam Prep Test Bank,
Prehospital Emergency Care, Patient Assessment and
Trauma Management, Airway and Breathing
Interventions, Cardiac Emergencies and CPR
Protocols, Pharmacology for EMTs, EMS Operations
and Safety Procedures, and Detailed Rationales for
Certification Success
Question 1: A 45-year-old male with a history of hypertension complains of sudden,
severe chest pain radiating to his back. His blood pressure is 180/110 mmHg in the
right arm and 100/70 mmHg in the left arm. What is the most likely diagnosis?
A. Acute Myocardial Infarction
B. Pulmonary Embolism
C. Aortic Dissection
D. Pericarditis
CORRECT ANSWER: C. Aortic Dissection
Rationale: Aortic dissection often presents with sudden, severe, tearing chest or back
pain and can cause asymmetric blood pressures in the upper extremities due to
differential involvement of the brachiocephalic vessels. This presentation is classic and
should be the primary differential.
Question 2: In a patient with severe anaphylaxis, what is the primary
pharmacologic intervention and its mechanism of action?
A. Diphenhydramine; blocks histamine H1 receptors
B. Albuterol; beta-2 agonist for bronchodilation
C. Epinephrine; alpha and beta agonist causing vasoconstriction and bronchodilation
D. Methylprednisolone; reduces late-phase inflammation
CORRECT ANSWER: C. Epinephrine; alpha and beta agonist causing
vasoconstriction and bronchodilation
Rationale: Epinephrine is the drug of choice for anaphylaxis. Its alpha-adrenergic
effects reverse peripheral vasodilation and hypotension, while its beta-2 effects reverse
bronchospasm. Corticosteroids and antihistamines are adjunctive treatments.
Question 3: Which ECG finding is most consistent with hyperkalemia?
A. Peaked T-waves
B. U-waves
,C. Prolonged QT interval
D. ST-segment depression
CORRECT ANSWER: A. Peaked T-waves
Rationale: Tall, peaked, symmetrical T-waves are an early and classic ECG sign of
hyperkalemia. As potassium levels rise, the ECG can progress to widened QRS
complexes and sine-wave patterns. U-waves are associated with hypokalemia.
Question 4: When managing a tension pneumothorax, where should the needle
decompression be performed?
A. Midaxillary line, 4th or 5th intercostal space
B. Midclavicular line, 2nd intercostal space
C. Midsternal line, 1st intercostal space
D. Posterior axillary line, 6th intercostal space
CORRECT ANSWER: B. Midclavicular line, 2nd intercostal space
Rationale: The standard location for needle decompression is the 2nd intercostal
space at the midclavicular line. This approach minimizes the risk of hitting the heart or
major vessels, which are more central.
Question 5: A patient with a spinal cord injury at the C6 level would likely retain
function of which muscle group?
A. Diaphragm
B. Biceps
C. Wrist extensors
D. Intercostals
CORRECT ANSWER: C. Wrist extensors
Rationale: A C6 injury generally results in preserved shoulder abduction, elbow flexion
(biceps), and wrist extension. The diaphragm (C3-C5) and intercostals (T1-T12) are not
innervated by C6.
Question 6: What is the most likely acid-base disturbance in a patient with a 3-day
history of vomiting?
A. Respiratory acidosis
B. Metabolic acidosis
C. Metabolic alkalosis
D. Respiratory alkalosis
CORRECT ANSWER: C. Metabolic alkalosis
,Rationale: Vomiting results in the loss of gastric hydrochloric acid, leading to a net gain
of bicarbonate in the blood, causing metabolic alkalosis. This is a common cause of
hypochloremic metabolic alkalosis.
Question 7: In the context of cardiogenic shock, which hemodynamic parameter is
most indicative of the condition?
A. Decreased pulmonary capillary wedge pressure (PCWP)
B. Increased cardiac output
C. Increased PCWP and decreased cardiac output
D. Decreased systemic vascular resistance (SVR)
CORRECT ANSWER: C. Increased PCWP and decreased cardiac output
Rationale: Cardiogenic shock is characterized by pump failure, leading to increased
ventricular filling pressures (PCWP) and a significant reduction in cardiac output. SVR is
typically elevated as a compensatory mechanism.
Question 8: A patient with a history of COPD presents with respiratory distress.
Which oxygen delivery device provides the most precise and consistent FiO2?
A. Nasal cannula
B. Non-rebreather mask
C. Venturi mask
D. Simple face mask
CORRECT ANSWER: C. Venturi mask
Rationale: The Venturi mask uses the Venturi principle to entrain air and deliver a
precise, fixed concentration of oxygen. It is the most reliable device for patients with
COPD who require controlled oxygen therapy to avoid suppressing their hypoxic drive.
Question 9: During a cardiac arrest, a patient presents with a shockable rhythm.
What is the appropriate energy dose for a biphasic defibrillator?
A. 120-200 Joules
B. 200-300 Joules
C. 360 Joules
D. 50-100 Joules
CORRECT ANSWER: A. 120-200 Joules
Rationale: The recommended initial dose for biphasic defibrillation is between 120-200
Joules. For monophasic defibrillators, the standard is 360 Joules. The 120-200 J range is
effective and minimizes myocardial damage.
, Question 10: What is the primary neurological deficit associated with a stroke
affecting the left middle cerebral artery?
A. Left-sided hemiplegia and neglect
B. Right-sided hemiplegia and aphasia
C. Bilateral blindness
D. Ataxia and diplopia
CORRECT ANSWER: B. Right-sided hemiplegia and aphasia
Rationale: The left middle cerebral artery supplies the motor cortex and
Broca's/Wernicke's areas. Infarction leads to contralateral (right-sided) hemiplegia and
aphasia (speech deficits) in right-handed individuals.
Question 11: Which of the following IV fluids is most appropriate for a patient with
severe traumatic brain injury and hypotension?
A. 0.9% Normal Saline
B. 0.45% Normal Saline
C. D5W
D. 3% Hypertonic Saline
CORRECT ANSWER: A. 0.9% Normal Saline
Rationale: In TBI with hypotension, the goal is to restore perfusion without causing
cerebral edema. Isotonic crystalloids like Normal Saline are preferred as they do not
cause osmotic shifts. Hypertonic saline may be used in specific protocols, but normal
saline is the standard initial resuscitative fluid.
Question 12: What is the most common cause of upper airway obstruction in an
unresponsive patient?
A. Foreign body aspiration
B. Laryngeal edema
C. Tongue obstruction
D. Epiglottitis
CORRECT ANSWER: C. Tongue obstruction
Rationale: In an unresponsive patient, the loss of muscle tone allows the tongue to fall
back against the posterior pharyngeal wall, causing the most common form of airway
obstruction. This is managed with the head-tilt/chin-lift or jaw-thrust maneuver.
