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HLT-EMT39-05 · Lesson 11 · 48 clock hours · lab

Pharmacology in Integrated Patient Scenarios

Objective. Students will integrate patient assessment findings with pharmacological knowledge to select, prepare, dose-calculate, administer, and monitor medications across high-fidelity simulation scenarios encompassing cardiac arrest, respiratory failure, anaphylaxis, seizure, and toxicological emergencies.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Pharmacology in Integrated Patient Scenarios

By this point in the course you have studied individual drug classes, dose calculations, and administration routes. In real EMS practice, those skills must work together under pressure. This lab brings everything into a single workflow: assess the patient, recognize the emergency, select the right drug, calculate the dose, administer it correctly, and then monitor the patient's response. Each step depends on the one before it.

The Integrated Medication Workflow

Every medication decision in the field follows the same sequence regardless of the emergency:

1. Scene safety and primary assessment — establish that it is safe to act and identify life threats.

2. Focused history and physical exam — gather the information that drives drug selection (chief complaint, vital signs, weight estimate, allergies, current medications, SAMPLE history).

3. Drug selection — choose the agent indicated by your patient's condition and permitted by your protocol and scope of practice.

4. Dose calculation — calculate the exact dose based on patient weight or a fixed-dose protocol; double-check your math before drawing up the drug.

5. Preparation and route selection — draw up the correct volume, select the appropriate route (IV, IO, IM, intranasal, inhaled, sublingual), and verify the drug and concentration against the label.

6. Administration — deliver the medication using correct technique; state the drug, dose, route, and time aloud for your team.

7. Reassessment and monitoring — evaluate the patient's response at appropriate intervals; document every observation.

Skipping or rushing any step creates risk for the patient. The 10% dose-error rule you will be graded on reflects real-world standards: an error of that magnitude can be clinically significant, especially with potent cardiac drugs, paralytics, or opioids.

Scenario Families You Will Practice

Cardiac Arrest — rhythm recognition drives the resuscitation algorithm. Drug timing is tied to CPR cycles. Medications are given by IV or IO access established without interrupting compressions. Confirm access, flush after each drug, and document exact times.

Severe Bronchospasm / Respiratory Failure — inhaled bronchodilators are the first-line agents for bronchospasm. Assess breath sounds before and after administration. Failure to improve or worsening respiratory status may require escalation, including airway management adjuncts.

Anaphylaxis — epinephrine by the intramuscular route is the immediate priority; delay is dangerous. Antihistamines and corticosteroids are secondary. Reassess blood pressure, airway, and skin findings continuously. Be prepared to repeat epinephrine if needed and to manage airway edema.

Status Epilepticus — benzodiazepines are the first-line agents for active seizures. Route selection (IV, IM, intranasal, rectal depending on access) affects onset time. Monitor airway, breathing, and level of consciousness closely after administration because respiratory depression is a real risk. Document seizure duration and any postictal changes.

Opiate Toxicity — the classic triad is altered mental status, respiratory depression, and miosis. Naloxone reverses opioid-induced respiratory depression. Titrate the dose to adequate respiratory effort, not necessarily full wakefulness, to avoid acute withdrawal and agitation. Naloxone's duration of action may be shorter than the offending opioid; monitor for re-narcotization.

Safe Medication Preparation in Simulation

Simulation uses labeled practice vials, but you must treat every step as real. Before drawing up any drug:

In the team setting, announce every medication action aloud. Your teammates serve as a safety check; closed-loop communication — where the recipient confirms the order — reduces error.

Documentation as a Patient Safety Tool

The electronic PCR you complete after your team-leader scenario is not a paperwork exercise. Accurate documentation of drug, dose, route, time, and patient response:

Practice entering medication entries in the PCR immediately after each administration during simulation, just as you would in the field.

Debriefing and Self-Evaluation

Video review gives you an objective view of your own performance. When watching your scenario, focus on:

Honest self-evaluation is a professional skill. Identifying your own gaps in simulation is the safest place to do it.

Key terms10

Closed-loop communicationA communication technique in which the person receiving an order repeats it back to the sender for confirmation, reducing the risk of error during team-based care.
Dose calculationThe mathematical process of determining the correct amount of a drug to administer based on the patient's weight or a fixed-dose protocol and the drug's available concentration.
High-fidelity simulationTraining that uses advanced manikins capable of producing realistic physiological responses (breath sounds, pulses, changing vital signs) to replicate actual patient care situations.
Intramuscular (IM) routeAdministration of a medication by injection directly into muscle tissue, providing faster absorption than oral routes and used when IV access is unavailable or the drug is formulated for IM use.
Intraosseous (IO) accessA vascular access route that delivers fluids and medications directly into the bone marrow cavity, used when IV access cannot be rapidly established, especially in cardiac arrest.
NaloxoneAn opioid antagonist medication that rapidly reverses opioid-induced respiratory depression by competitively binding opioid receptors; its duration of action may be shorter than that of the causative opioid.
Re-narcotizationReturn of opioid toxicity symptoms after an initial response to naloxone, occurring when naloxone's effect wanes before the opioid is metabolized; requires continued patient monitoring.
Status epilepticusA medical emergency defined as a prolonged seizure or repeated seizures without recovery of consciousness between them; benzodiazepines are the first-line pharmacological treatment.
Prehospital Care Report (PCR)The official legal and medical document completed by EMS providers after each patient contact, recording assessment findings, interventions, medications given, and patient response.
TitrationThe practice of adjusting a drug dose incrementally to achieve a desired clinical effect while minimizing adverse effects, used with drugs such as naloxone and analgesics.

Worked examples4

1. Epinephrine for anaphylaxis (IM). Your patient weighs an estimated 80 kg and is in anaphylaxis. Your protocol calls for epinephrine 0.3 mg IM using the 1:1,000 concentration (1 mg/mL). What volume do you draw up?
  1. Identify the ordered dose: 0.3 mg.
  2. Identify the available concentration: 1 mg/mL.
  3. Apply the formula: Volume = Dose ÷ Concentration = 0.3 mg ÷ 1 mg/mL.
  4. Calculate: 0.3 ÷ 1 = 0.3 mL.
Answer: Draw up 0.3 mL of epinephrine 1:1,000 for IM administration.
2. Weight-based benzodiazepine dose. Your protocol authorizes a benzodiazepine at 0.1 mg/kg IV for active seizure. The patient weighs 70 kg. The vial reads 5 mg/mL. What dose in milligrams do you give and what volume do you draw?
  1. Calculate the dose in mg: 0.1 mg/kg × 70 kg = 7 mg.
  2. Identify the available concentration: 5 mg/mL.
  3. Apply the formula: Volume = Dose ÷ Concentration = 7 mg ÷ 5 mg/mL.
  4. Calculate: 7 ÷ 5 = 1.4 mL.
Answer: Administer 7 mg (1.4 mL) IV. Always verify this dose against your local protocol maximum before administration.
3. Naloxone dose and 10% error check. Your protocol calls for naloxone 0.4 mg IV for suspected opiate toxicity. The vial is labeled 0.4 mg/mL. What volume do you draw, and what is the acceptable dose range given the 10% error standard?
  1. Calculate the volume: 0.4 mg ÷ 0.4 mg/mL = 1.0 mL.
  2. Calculate 10% of the ordered dose: 10% × 0.4 mg = 0.04 mg.
  3. Determine the acceptable range: 0.4 mg − 0.04 mg = 0.36 mg (low end); 0.4 mg + 0.04 mg = 0.44 mg (high end).
  4. Any administered dose outside the range 0.36–0.44 mg constitutes a critical error in this lab setting.
Answer: Draw 1.0 mL (0.4 mg). The acceptable dose range under the 10% rule is 0.36 mg to 0.44 mg.
4. Epinephrine cardiac arrest IV/IO push. During cardiac arrest, your protocol specifies epinephrine 1 mg IV/IO every 3–5 minutes using the 1:10,000 concentration (0.1 mg/mL). What volume delivers 1 mg?
  1. Identify the ordered dose: 1 mg.
  2. Identify the available concentration: 0.1 mg/mL.
  3. Apply the formula: Volume = Dose ÷ Concentration = 1 mg ÷ 0.1 mg/mL.
  4. Calculate: 1 ÷ 0.1 = 10 mL.
  5. Note: 1:10,000 means 1 mg per 10 mL — this confirms your answer.
Answer: Administer 10 mL of epinephrine 1:10,000 to deliver 1 mg IV/IO.

The math in this lesson1

Learners divide a 0.3 mg epinephrine order by 1 mg/mL to draw up 0.3 mL for IM injection.
7.RP.2
In class: High-fidelity simulation rotation: groups of three rotate through five manikin-based scenarios (cardiac arrest, severe bronchospasm, anaphylaxis, status epilepticus, opiate toxicity); each student takes the team-leader role for at least one scenario and performs at least three medication administrations per rotation. · Debriefing using video review: instructor plays back simulation recording; students self-evaluate medication decision timing, dose accuracy, route selection, and monitoring against scenario objectives using a structured debriefing guide. · Post-scenario documentation: each student completes a full electronic PCR for their team-leader scenario, including medication entries, dose, route, time, patient response, and reassessment findings, submitted for instructor review.
Materials: High-fidelity simulation manikins, simulation medication kits (labeled practice vials), IV/IO trainers, defibrillator/monitor trainer, electronic PCR software, video recording system, debriefing guide, NREMT exam blueprint
Check: Simulation performance evaluated on a scenario rubric (medication decision, dose accuracy, route, timing, monitoring, documentation); pass mark 80% on rubric total. Medication dose errors exceeding 10% of correct dose are automatic critical fail requiring remediation.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Pharmacology / Cardiac Resuscitation
1. During a cardiac arrest simulation, you establish IO access. After delivering a medication via IO, what step is essential immediately afterward?
Pharmacology / Allergic Emergencies
2. A patient in anaphylaxis has urticaria, audible stridor, and a blood pressure of 76/40 mmHg. Which medication is the immediate priority?
Pharmacology / Toxicological Emergencies
3. After administering naloxone to a patient with suspected opioid overdose, the patient's respirations improve to 14 breaths/min. Thirty minutes later, respirations slow again to 6 breaths/min and the patient is unresponsive. This most likely represents:
Pharmacology / Neurological Emergencies
4. You are caring for a patient in active seizure. IV access is unavailable. Your protocol authorizes intranasal administration of a benzodiazepine. What anatomical consideration makes the intranasal route effective?
Pharmacology / Dose Calculation
5. Your protocol calls for a weight-based dose of 0.1 mg/kg of a drug for a 60 kg patient. The drug is available at 2 mg/mL. What volume should you administer?
Patient Assessment / EMS Operations
6. During debriefing, video review shows you administered an inhaled bronchodilator to a patient in severe bronchospasm but did not reassess breath sounds afterward. Which element of the integrated medication workflow did this omission violate?
EMS Operations / Patient Safety
7. Which of the following best describes the purpose of closed-loop communication when announcing a medication administration to your team?
Pharmacology / Cardiac Resuscitation
8. In a cardiac arrest scenario, epinephrine is ordered every 3–5 minutes. Which action best ensures accurate timing of repeat doses?
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