3.5 Blood Pressure, Pulse, and Vital Signs
Key Takeaways
- Adult reference ranges: blood pressure about 120/80 mm Hg, pulse 60-100 bpm, respiration 12-20 breaths/min, temperature about 98.6 degrees F (37 degrees C).
- ACC/AHA categories: normal <120/<80, elevated 120-129/<80, stage 1 130-139 or 80-89, stage 2 >=140 or >=90, crisis >180 or >120.
- Blood pressure technique questions test cuff size, patient positioning, arm support at heart level, rest, and accurate recording.
- The RDA records actual measurements and notifies the dentist about unusual or symptomatic findings rather than deciding medical clearance.
- Vitals connect assessment records to emergency preparedness because changes can identify stress, pain, illness, or medical risk.
Vital signs as a baseline, not independent clearance
Vital signs give the team a baseline before care. Blood pressure, pulse, respiration, temperature (per office protocol), and pain reports help the dentist judge whether the planned treatment is appropriate that day. The exam focuses on accurate measurement, documentation, and communication — not on the RDA making a medical diagnosis. Memorize the adult reference ranges, because "unusual value" questions depend on knowing what normal looks like.
| Vital sign | Typical adult range | Common units |
|---|---|---|
| Blood pressure | ~120/80 mm Hg (normal) | millimeters of mercury |
| Pulse (heart rate) | 60-100 beats per minute | bpm, at rest |
| Respiration | 12-20 breaths per minute | breaths/min, at rest |
| Temperature | ~98.6 degrees F (37 degrees C); ~97.8-99 degrees F normal | Fahrenheit / Celsius |
ACC/AHA blood pressure categories
Blood pressure is reported as systolic over diastolic. Under the 2017 ACC/AHA guideline, the categories are:
| Category | Systolic | Diastolic |
|---|---|---|
| Normal | less than 120 | and less than 80 |
| Elevated | 120-129 | and less than 80 |
| Stage 1 hypertension | 130-139 | or 80-89 |
| Stage 2 hypertension | 140 or higher | or 90 or higher |
| Hypertensive crisis | higher than 180 | and/or higher than 120 |
When systolic and diastolic fall in different categories, the patient is placed in the higher category (128/82 is stage 1). A reading in the crisis range, especially with symptoms such as chest pain, severe headache, or vision change, calls for immediate dentist notification and the office emergency protocol — the RDA does not silently continue setup.
Technique that protects accuracy
A cuff that is too small, an unsupported arm, crossed legs, talking during measurement, recent exertion, a full bladder, or measuring over bulky clothing can all distort a reading. The exam may ask why a reading should be repeated or what setup improves accuracy. Anxiety also raises readings, so let the patient sit, explain the steps, and follow office protocol — including a brief rest when required.
| Vital sign / observation | Technique focus | Exam-safe response to a concern |
|---|---|---|
| Blood pressure | Correct cuff size, arm supported at heart level, patient calm, accurate systolic/diastolic | Repeat per protocol and notify dentist of unusual values |
| Pulse | Rate and rhythm when assigned, patient at rest | Report irregular, very rapid, very slow, or symptomatic findings |
| Respiration | Observe rate and effort without making the patient self-conscious | Alert dentist to shortness of breath, wheezing, or labored breathing |
| Temperature | Office-approved device with infection-control steps | Communicate fever or illness per office policy |
| Pain level | Location, onset, character, severity (e.g., 0-10 scale) | Record patient's words; route urgent symptoms to the dentist |
Record honestly, escalate promptly
Record what you obtain. Do not round numbers to look better, and do not write "normal" when the chart expects a measurement. If the reading is unusual, the patient is symptomatic, or the result conflicts with planned care, alert the dentist. The RDA does not declare a patient "medically cleared" or diagnose hypertension from a single dental-office reading. A patient who feels faint, has not eaten, reports chest symptoms, or appears short of breath may need positioning, postponement, or emergency evaluation — know where the emergency kit and oxygen are and follow the office plan.
Use this vital-sign checklist:
- Seat the patient comfortably and allow a brief rest when protocol calls for it.
- Choose the correct equipment and cuff size.
- Support the arm at heart level for blood pressure.
- Record actual numbers plus required context (arm, position, time, repeat).
- Tell the dentist when values, symptoms, or appearance suggest treatment should pause.
Reading the numbers in context
Vital signs are most useful when read against the patient's baseline and the day's situation. A single high reading is not a diagnosis: pain, white-coat anxiety, caffeine, nicotine, or a rushed arrival can all push blood pressure up. That is why protocol-driven offices allow a brief rest and a repeat reading before acting. A pulse of 105 in an anxious patient who just hurried in differs from a pulse of 105 with chest pressure and shortness of breath — the second pattern is what should stop the routine flow. The RDA's value is recognizing the combination of an abnormal number with symptoms or appearance, then routing it to the dentist.
Pain assessment rounds out the vital-sign picture. A simple 0-10 scale plus the location, onset, and character of the pain (sharp, dull, throbbing, triggered by cold or biting) gives the dentist a focused starting point and ties directly to the chief complaint recorded earlier. Record the patient's own rating and words rather than your interpretation.
Common vital-sign traps
- "Normalizing" a reading. Never chart "normal" or round a value to look better; record the actual measurement.
- Wrong cuff size. A cuff too small reads falsely high; too large reads falsely low. Match the cuff to the arm.
- Skipping the repeat. When a reading is borderline or surprising, follow protocol to rest and re-measure before escalating.
- Acting outside scope. The RDA never tells a patient to change a medication dose or declares them "cleared."
The through-line is the same as the rest of Domain 1A: measure carefully, document honestly, and escalate promptly. The dentist decides what a finding means for treatment; the RDA makes sure the finding is accurate and visible in time to matter.
Which set of values reflects typical adult reference ranges for pulse and respiration at rest?
Under ACC/AHA categories, how is a blood pressure of 128/82 mm Hg classified?
Which factor can make a blood pressure reading less reliable?
A patient's vital signs are unusual and the patient feels lightheaded. What should the RDA do?