Vital Signs: Pulse

Pulse assessment is a core vital sign and a window into cardiovascular health. The pulse reflects how well the heart pumps blood through the arteries and shows changes in rate, rhythm, and strength. Accurate assessment catches tachycardia, bradycardia, and irregular rhythms. This covers the principles, techniques, and clinical considerations.

What is a Pulse?

A pulse is the palpable throbbing felt over an artery as blood is ejected with each heart contraction, the mechanical surge during ventricular systole traveling through the arteries in a wave. It is felt most easily in superficial arteries like the radial or carotid. Its rate, rhythm, and strength reveal cardiac function and circulatory status.

What is Pulse Rate?

Pulse rate is the number of palpable pulses (heartbeats) counted over one minute, expressed in beats per minute (bpm). The normal resting rate for healthy adults is 60 to 100 bpm, varying with age, activity, and health. It detects bradycardia (slow) or tachycardia (fast), which may signal underlying conditions.

Purposes of Assessing Pulse

1. Evaluate cardiac function. Rate, rhythm, and strength reveal arrhythmias, heart failure, or conduction abnormalities; an irregular pulse may indicate atrial fibrillation.
2. Monitor response to interventions or medications, such as beta-blockers (which slow the rate) or epinephrine (which increases it), and changes from fluid resuscitation, oxygen, or activity.
3. Detect early deterioration or emergencies. A sudden change can signal shock, hemorrhage, infection, or dehydration; a central (carotid) pulse confirms the heart is circulating blood.

Normal Pulse Ranges

Pulse rate decreases from infancy to adulthood as the cardiovascular system matures. Newborns have the highest rates at 100 to 180 bpm. Infants run 100–160 bpm, toddlers 90–140 bpm, and school-age children 75–100 bpm. Adolescents and adults rest at 60–100 bpm, with well-conditioned athletes often lower. Older adults remain at 60–100 bpm, though mild irregularities or slightly slower rates can occur.

Age Group	Normal Pulse Range (bpm)	Explanation
Newborns (0-1 month)	100-180	High metabolic rate and immature cardiovascular control.
Infants (1-12 months)	100-160	Slows slightly as the nervous and cardiovascular systems develop.
Toddlers (1-3 years)	90-140	Still elevated due to growth and high activity levels.
Preschoolers (3-5 yrs)	80-110	Heart rate begins to stabilize closer to adult levels.
School-age (6-12 yrs)	75-100	Cardiovascular system becomes more efficient with age.
Adolescents (13-18 yrs)	60-90	Approaching adult norms as body matures.
Adults (18-64 yrs)	60-100	Steady, efficient heart function; athletes may have lower rates (40-60 bpm).
Older Adults (65+ yrs)	60-100	Same range as adults, but pulse may be slower or slightly irregular with aging.

Common Pulse Sites

The pulse can be felt at arterial sites where an artery lies close to the skin over a bone. Nine common pulse points are used in nursing. The radial artery at the wrist is most common in adults; the carotid in the neck is checked in emergencies like cardiac arrest; and the apical pulse (at the heart's apex) is used for infants or to verify discrepancies between heart and peripheral pulses.

1. Temporal: on the temples, anterior to the ear, along the temporal artery; useful for head blood flow, head trauma, or suspected temporal arteritis.
2. Carotid: in the neck beside the trachea, one of the strongest and most reliable pulses, checked in cardiac arrest or shock. Palpate only one carotid at a time.
3. Apical: at the apex of the heart, typically the fifth intercostal space along the midclavicular line, just below the left nipple; requires a stethoscope and is the most accurate heart rate measure, preferred for infants and irregular rhythms.
4. Brachial: inside the upper arm just above the elbow crease (antecubital fossa); used for blood pressure and the preferred infant site.
5. Radial: lateral wrist, proximal to the base of the thumb; the most common adult site for routine assessment.
6. Femoral: in the groin where the femoral artery passes beneath the inguinal ligament; a central pulse critical in trauma, shock, or suspected occlusion.
7. Popliteal: behind the knee in the popliteal fossa, deeper and harder to find; evaluates lower-leg circulation and peripheral vascular disease.
8. Posterior tibial: behind the medial malleolus; assesses foot and lower-leg blood flow, important in diabetes and vascular disease.
9. Dorsalis pedis: on the top of the foot, lateral to the big toe's extensor tendon; evaluates peripheral circulation and confirms arterial supply to the foot.

Pulse Site	Location	Common Use
Temporal	Lateral forehead, in front of the ear	Assess circulation to the head; used in infants or unconscious patients
Carotid	Side of the neck, beside the trachea	Used in emergencies; reflects central circulation
Apical	5th intercostal space, midclavicular line (left chest)	Most accurate; used for irregular rhythms or in infants
Brachial	Inner aspect of the arm near the elbow	Common in blood pressure measurement and infant pulse assessments
Radial	Thumb side of the wrist	Most commonly used in adults for routine monitoring
Femoral	Groin area, near the femoral artery	Assesses circulation to the lower extremities; used in shock or trauma
Popliteal	Behind the knee	Checks blood flow to the lower legs; used in peripheral vascular assessment
Posterior Tibial	Behind the medial malleolus (inner ankle bone)	Evaluates circulation to the feet and lower legs
Dorsalis Pedis	Top of the foot, along the line between the big toe and second toe	Monitors peripheral circulation, especially in diabetic or vascular patients

Palpate each site with moderate pressure using the pads of the index and middle fingers (and ring finger if needed). Too much force obliterates the pulse; too little misses it. Assess the radial pulse on one side for rate and rhythm; when checking pulses for perfusion (such as pedal pulses), compare both sides for symmetry.

Factors Affecting Pulse Rate

• Age: rate decreases with age; infants and young children run faster.
• Exercise: raises the rate to meet oxygen demand, returning to baseline during recovery.
• Stress and emotions: anxiety and excitement stimulate the sympathetic nervous system, raising the rate.
• Body temperature: fever raises the rate; hypothermia slows it.
• Medications: beta-blockers slow the rate; caffeine and epinephrine raise it; anesthetics and some pain medications alter it.
• Hormonal changes: thyroxine and adrenaline raise the rate; menstruation, pregnancy, and menopause cause variations.
• Health conditions: heart disease, infection, anemia, and dehydration influence the rate (infections and anemia often cause tachycardia).
• Posture: standing causes a slight increase as the heart works against gravity.
• Smoking and caffeine: nicotine and caffeine stimulate the sympathetic nervous system, raising the rate.

Common Pulse Terminology

Tachycardia: an abnormally fast rate, in adults over 100 beats per minute at rest, from exercise, anxiety, fever, anemia, or dehydration.

Bradycardia: an abnormally slow rate, in adults below 60 beats per minute. Normal in conditioned athletes, but otherwise from medications (beta-blockers), vagal stimulation, or conduction abnormalities. Severe symptomatic bradycardia can be an emergency.

Arrhythmia (dysrhythmia): any deviation from normal rhythm, including irregular, skipped, or extra beats, ranging from benign to serious (atrial fibrillation, heart blocks). If detected by pulse, an apical pulse and ECG are warranted.

Pulse deficit: the difference between the apical and a peripheral (usually radial) rate, occurring when the heart beats but not all beats reach the periphery. For example, an apical rate of 100 bpm with a radial pulse of 88 bpm is a pulse deficit of 12 beats, often seen in atrial fibrillation or heart failure. To assess it, one nurse auscultates the apical pulse while a second palpates the radial, both counting for one full minute, then compare. The radial rate should never exceed the apical.

Characteristics of a Pulse

Assess rate, rhythm, volume (strength), bilateral equality, and arterial wall elasticity.

Rate: beats per minute. Normal adult resting rate is 60–100 bpm; above 100 bpm is tachycardia, below 60 bpm is bradycardia (ranges differ by age). Verify an unusually high or low rate with an apical pulse. Very fast rates reduce filling time; very slow rates can compromise perfusion.

Rhythm: the pattern and intervals between beats. Normal sinus rhythm is evenly spaced; varying timing is irregular (an arrhythmia or dysrhythmia). Some are regularly irregular (a predictable skipped beat), others irregularly irregular. Assess the apical pulse if any irregularity appears, and use an ECG for persistent arrhythmias.

Volume (strength or amplitude): the force of each beat. A normal pulse is full or strong, palpable with moderate pressure and obliterated with stronger pressure. A bounding pulse is very strong and hard to obliterate (exercise, fever, fluid overload). A weak or thready pulse is feeble and easily obliterated (low blood volume, dehydration, shock).

Bilateral equality: for paired pulses (radial, pedal), compare both sides for equal strength and symmetry. Unequal pulses may indicate a localized circulation problem or blockage. Always check the corresponding pulse on the opposite side. Palpate carotid pulses one side at a time.

Elasticity of the arterial wall: a normal artery feels smooth, straight, and elastic. In older adults, arteries may feel rigid or tortuous from arteriosclerosis. A very hardened, cord-like artery may suggest vascular disease.

Assessing a Peripheral Pulse (Radial)

A peripheral pulse is palpated in an artery away from the heart, versus the central apical pulse heard at the heart. The radial pulse is the standard routine site.

Equipment. A watch or clock with a second hand. No stethoscope is needed for radial palpation. A Doppler ultrasound device (DUS) can detect a hard-to-feel pulse (gel may be needed).

Positioning. Ensure the client is rested and comfortable; if active, wait ~10–15 minutes. Position supine or sitting, with the arm relaxed and supported.

1. Introduce yourself and explain the procedure to reduce anxiety, gain cooperation, and ensure consent.

2. Perform hand hygiene to prevent infection.

3. Provide privacy as needed.

4. Position the patient comfortably with the arm relaxed and supported at heart level.

5. Locate the radial pulse with the pads of the first two or three fingers, pressing gently on the wrist just below the base of the thumb. Do not use your thumb, which has its own pulse. Apply light to moderate pressure, enough to feel without occluding the artery.

6. Palpate and count for 30 seconds (or 60 seconds if irregular), noting rhythm and strength. A 30-second count times two is often sufficient, but a full 60 seconds is more accurate for irregular rhythms.

7. Assess rhythm and volume while counting. Note regular versus irregular intervals and whether each beat feels strong, weak, or bounding. Grade volume on a scale: 0 = absent, 1+ = weak, 2+ = normal, 3+ = bounding. Compare both wrists when assessing vascular health.

8. Document the rate (bpm), site, rhythm, and volume, plus any unusual findings or interventions. For example: "Radial pulse 88 bpm, regular and 2+ volume, equal bilaterally." Note any action taken ("apical pulse auscultated for confirmation" or "MD notified of bradycardia").

9. Explain the findings and reassure the patient, for example, "Your pulse rate is within the normal range, and it feels regular."

If a Doppler device is used:

1. Apply conducting gel to the probe and skin, to transmit ultrasound waves.
2. Turn the device on and place the probe lightly over the artery until you hear the pulse, using light pressure to avoid compressing it.
3. Clean the gel off afterward.
4. Count the beats via the Doppler's sound.
5. Document that a Doppler was used.

Assessing an Apical Pulse

The apical pulse is a central pulse at the apex of the heart, the point of maximal impulse (PMI), assessed by auscultation with a stethoscope. Use it when a peripheral pulse is irregular or hard to palpate, when the patient has a cardiac or pulmonary condition, or before giving medications that affect heart rate (such as digoxin). It is preferred for infants and children under about 2–3 years.

Equipment. A stethoscope, a timekeeping device, and alcohol wipes.

Positioning. Supine or sitting upright, with the chest accessible (female patients may move clothing or lift the left breast aside). Drape for privacy and warmth.

1. Ensure a quiet environment and position the patient supine or sitting with the chest exposed.

2. Introduce yourself and explain the procedure to reduce anxiety.

3. Perform hand hygiene and confirm the stethoscope is clean and functioning.

4. Position the patient and locate the apical site. Have them lie flat or sit at a 45° angle if breathing is an issue, and expose the left chest.

• Locate the Angle of Louis (where the manubrium joins the sternal body), then slide just left of the sternum to find the second intercostal space (between the 2nd and 3rd rib).
• Count down the rib spaces: third, fourth, then the fifth intercostal space.
• Move laterally along the fifth intercostal space to the mid-clavicular line (MCL). The 5th ICS at the left MCL is the usual apical impulse in adults (just below the left nipple in men). In children it may be slightly higher (4th ICS at MCL in a toddler).

5. Place the stethoscope and listen. The two heart sounds (S1 and S2) make one heartbeat:

• Clean the diaphragm and earpieces with an alcohol wipe and warm the diaphragm.
• Insert the earpieces pointing slightly forward, using the diaphragm side.
• Place the diaphragm over the apical location (5th ICS at left MCL); you will hear the "lub-dub," where the "lub" (S1) and "dub" (S2) are the valves closing.

6. Count the apical rate for 60 seconds, counting each "lub-dub" as one heartbeat. Use a full minute for apical pulses or any irregularity; do not rely on a 15- or 30-second count, which can miss subtle irregularities.

7. Assess rhythm and sound quality:

• Note whether the beats are regular or irregular; an arrhythmia may present as early beats, pauses, or an erratic pattern.
• If irregular, rule out movement or noise and consider notifying a provider for an ECG.
• Note unusually loud or muffled heart sounds.

8. Conclude and document:

• Record the apical pulse and the patient's position, e.g., "Apical pulse auscultated at 5th ICS LMCL, 72 bpm, regular."
• Include rate, rhythm, and notable observations.
• If taken for an irregular radial pulse or medication, document the reason and follow-up: "Apical pulse taken due to irregular radial pulse, apical 80 bpm, radial 72 bpm; pulse deficit of 8 noted, reported to physician" or "Apical pulse (88, regular) taken prior to digoxin dose."
• Report and document significant deviations.

9. Inform the patient of the findings in simple terms.

10. Wipe the stethoscope diaphragm with alcohol and wash your hands.

Clinical Alerts and Best Practices

Never use your thumb to check a pulse, since it has its own pulse. Use the index and middle fingers (and ring finger if needed).

Never palpate both carotid arteries at once, which can stimulate the carotid sinus reflex and drop heart rate and blood pressure. Do one side at a time and avoid excessive carotid massage.

Wait after activity. If the patient has been active or anxious, let them rest about 5-10 minutes before a resting pulse, and give a minute for the pulse to stabilize after position changes.

Double-check an irregular or unusually high/low pulse with an apical count, for a full minute. If a pulse deficit is suspected, confirm with a second person or sequential counts, and report a significant deficit or new arrhythmia.

Use a Doppler for weak or hard-to-find pulses before declaring one absent. Apply gel and move the probe slowly. A truly undetectable pulse by palpation or Doppler is an urgent finding that may indicate arterial occlusion.

Consider patient factors when choosing sites. Use the apical pulse for infants and small children, the carotid (or femoral) in an unconscious adult, and the opposite side if one arm has an injury or cast.

Be mindful of irregular rhythms. In atrial fibrillation the pulse is very irregular; do a full-minute count, note the average rate and rhythm, and use apical as the gold standard.

Older adults: arteries may feel rigid or wiry, and peripheral circulation may be reduced. Assess foot pulses (posterior tibial and dorsalis pedis), especially in diabetes or arterial disease. Rely on apical pulse for an irregular heartbeat or pacemaker, and allow more recovery time after exercise.

Document and report abnormalities promptly. A rising pulse may indicate fever, pain, or hemorrhage; a dropping pulse may precede fainting or signal drug effects. Document rate, site, rhythm, and volume and any actions taken, and integrate pulse findings with other vital signs and the clinical picture.