🩺 Fundamentals, Fast · Lesson 1 of 5 · 6 min
The Numbers That Should Live in Your Spine
📈 The exam will hand you a set of vital signs and never say which one is abnormal. If you have to think about whether 24 breaths a minute is high, you have already lost two seconds and some confidence.
💡 Key idea
Know the adult normals cold, remember children run faster, and watch pulse pressure and MAP, which the exam uses to hint at shock and intracranial pressure.
🧠 Why it matters
Adult normals: HEART RATE 60 to 100 beats per minute; RESPIRATIONS 12 to 20 per minute; BLOOD PRESSURE under 120/80 is normal, 120 to 129 with a diastolic under 80 is elevated, a systolic of 130 to 139 or a diastolic of 80 to 89 is stage 1 hypertension, and 140 or 90 and above is stage 2; TEMPERATURE roughly 36.5 to 37.5 °C (97.7 to 99.5 °F); OXYGEN SATURATION 95 to 100%, with 88 to 92% the usual target in COPD. PULSE PRESSURE is systolic minus diastolic, normally about 40; it widens with increased intracranial pressure and narrows in hypovolemic shock (early septic shock can widen it). MEAN ARTERIAL PRESSURE (diastolic plus one third of the pulse pressure) needs to be at least 65 to perfuse organs. ORTHOSTATIC HYPOTENSION is a drop of 20 systolic or 10 diastolic within three minutes of standing. Children run faster: a newborn's heart rate is about 110 to 160 and respirations 30 to 60, both falling toward adult values through childhood.
🏥 In the real world
🧮 A client's blood pressure is 88/64. The numbers look borderline until you do the math: pulse pressure 24 (narrow) and MAP about 72. Then the next set reads 84/70: pulse pressure 14 and MAP 75. The MAP is fine but the narrowing pulse pressure is screaming early shock. The exam rewards candidates who see the trend, not the single reading.
📌 Takeaways
- Adult: HR 60–100, RR 12–20, BP under 120/80, SpO2 95–100%
- Pulse pressure widens with raised ICP and narrows in hypovolemic shock; MAP at least 65
- Newborns: HR about 110–160, RR 30–60
📖 Terms in this lesson
Pulse pressure: Systolic minus diastolic pressure, normally about 40; it narrows in shock and widens with raised intracranial pressure.
Mean arterial pressure (MAP): The average pressure driving blood to the organs, which must stay at or above 65 mmHg.
✅ Test yourself
Which adult vital sign set should the nurse report immediately?
- HR 64, RR 14, BP 124/78, SpO2 96%
- HR 88, RR 18, BP 132/84, SpO2 95%
- HR 76, RR 16, BP 118/76, SpO2 97%
- HR 122, RR 26, BP 86/60, SpO2 90%
Answer: D · HR 122, RR 26, BP 86/60, SpO2 90%
Tachycardia, tachypnea, hypotension and a low saturation together suggest shock or sepsis and need immediate action.
A client's blood pressure is 130/70 lying down and 104/58 after standing for two minutes. How should the nurse interpret this?
- Normal variation after a position change
- Orthostatic hypotension; a fall risk
- Hypertensive urgency
- Only the diastolic change is clinically meaningful
Answer: B · Orthostatic hypotension; a fall risk
A drop of at least 20 systolic or 10 diastolic within three minutes of standing defines orthostatic hypotension. Protect against falls.
A head-injured client's blood pressure moves from 120/80 to 168/60 with a heart rate of 52. What does the widening pulse pressure with bradycardia suggest?
- Hypovolemic shock
- Normal post-injury adaptation
- Rising intracranial pressure
- Dehydration
Answer: C · Rising intracranial pressure
Widened pulse pressure, bradycardia and irregular respirations form Cushing's triad, a late sign of rising intracranial pressure.
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