Assessment
Vital Sign Interpretation at the EMT-Basic Level
Reading blood pressure, pulse, respirations, and SpO₂ together to identify perfusion failure and guide first interventions.
Trends matter more than single numbers
MedlinePlus defines vital signs as temperature, pulse, respiration rate, and blood pressure—measures of basic body function.1 EMS adds oxygen saturation and pain scores in many systems. A single hypertensive reading means little in isolation; tachycardia with cool skin and narrow pulse pressure signals shock even before hypotension appears.
Respiratory rate is often the earliest vital to change in sepsis, pulmonary embolism, and metabolic crisis. Count for a full minute when rhythm is irregular. Pulse oximetry supplements but does not replace exam—carbon monoxide poisoning and poor perfusion can produce misleading readings.
Matching interventions to vital patterns
The CDC notes that chronic hypertension is common; treat acute symptoms and end-organ dysfunction rather than arbitrary numeric targets in the field.2 Bradycardia with hypotension may indicate conduction block or late shock; tachycardia with fever suggests sepsis; bradycardia with altered mental status may be opioid toxicity.
Reassess vitals after every intervention—oxygen, fluid bolus per scope, naloxone, bronchodilator assist. Document trends in the PCR: “BP 90/60 after 2 L O₂ via NRB, HR decreased from 130 to 110.” Patterns drive exam items and real-world QA review.
Practice this skill
Apply what you read with a hands-on Vital Sign Interpretation drill — instant feedback on every scenario.
