PRACTICE PALPATING THESE PULSES ON YOURSELF USING YOUR INDEX AND MIDDLE FINGER AND PRACTICE ALSO GETTING THE PULSE RATE PER MINUTE. TRY TO GET THE RADIAL PULSE RATE OF AT LEAST 20 PERSONS, RECORD IT AND PASS IT TO ME NEXT SEMESTER. IT WILL BE GRADED.
It is very easy to overlook the art of clinical examination when new technology can so easily be employed to make diagnoses. Systematic cardiovascular examination can provide a diagnosis quickly without need for invasive or expensive tests. Such routine examination can reveal an unexpected and timely diagnosis.
Historically, in the Middle or Far East, doctors were expected to make many diagnoses on examination of the radial pulse alone. Still today, thorough examination of the pulse can provide a lot of information and help form an accurate diagnosis.
It is important to develop a reliable routine for examining the pulse and to refine and improve the technique throughout a career.
- Cardiovascular symptoms including:
- Chest pain (at rest or on exertion).
- Tiredness or lethargy.
- Shortness of breath on exertion.
- Age (affects the likelihood of atherosclerosis).
- Past medical history (particularly of thyroid, cardiovascular and cerebrovascular disease).
- Lifestyle and occupation (the fit and trained athletes have very low pulse rates).
- Medication (many drugs can affect the pulse including betablockers and digoxin).
Observe the patient whilst taking the history. Look for:
- Apprehension or anxiety.
- Pallor or anaemia.
- Features of specific diseases especially those associated with cardiovascular disease:
- Thyroid disease.
- Recognisable syndromes.
- Pulsations in the neck:
- Arterial and venous pulsations (jugular venous pulse) may be visible in the neck.
- Head movement:
- Take the patient’s hand and assess:
- Warmth (fever, thyrotoxicosis).
- There may be peripheral cyanosis.
- Clubbing of the nails (may indicate other disease, although clubbing can be congenital and benign).
- Splinter haemorrhages (infective endocarditis).
- Koilonychia (might indicate iron deficiency).
- Quincke’s sign is pulsation of the capillary nail bed (with the very wide pulse pressure of aortic regurgitation).
Which pulse should be examined?
- This will depend on circumstances and whether there are specific clinical reasons for examining a particular pulse or for systematically examining all arterial pulses.
- In clinical examinations it is important that the student follow instructions and take clues from the questions posed by the examiner and the type of examination (distinguish, for example, between a request to examine a pulse and conducting a cardiovascular examination). Such examination technique can be practised according to the requirements of the particular examination to ensure success.
- Clinically it is traditional to examine the radial pulse first. However, there is much to commend routinely following this with examination of the larger brachial and carotid arteries to feel the nature of the wall and particularly the character of the pulse.
- There are, of course, specific reasons to examine all the pulses at different sites as part of a complete and systematic cardiovascular examination. As ever, in clinical practice there will be some selectivity to save time in the consultation.
|Systematic examination of pulses:|
|Which and what order?||Where and how?||Why?|
|1. Radial artery||
|2. Brachial artery||
|3. Carotid artery||
|4. Femoral artery||
|5. Popliteal artery||
|6. Dorsalis pedis (DP) and tibialis posterior (TP) arteries (foot)||
|7. The abdominal aorta||
Assessment of the pulse
The pulses are felt in the various sites (located as in the table above). In general:
- Palpate the artery wall with the tips of the index and middle fingers. The tips are very sensitive. Some recommend avoiding palpation with the thumb (misinterpreting your own radial pulse pulsating in examiner’s thumb). However, others contend that kinaesthetic sensitivity is better in the thumb to detect pulse character in (carotid artery and brachial artery particularly).
- Do not press too hard for fear of obliterating the pulse.
- Does the wall feel soft and pliable or is it hard and sclerotic?
- Identify the qualities or characteristics of the pulse by asking:
- What is the pulse rate?
- What is the pulse rhythm?
- What is the character of the pulse?
What is the pulse rate?
- A normal pulse rate after a period of rest is between 60 and 80 beats per minute (bpm). It is faster in children. However, if tachycardia is defined as a pulse rate in excess of 100 bpm and bradycardia is less than 60 bpm, then between 60 and 100 bpm must be seen as normal.
- An irregular pulse or a slow pulse should be measured over a longer time. As a guide, it is unwise to measure a regular rate for less than 20 seconds (30 seconds being preferable) and an irregular pulse should not be measured over less than 30 seconds, preferably a full minute.
- Bradycardia may be physiological in a trained athlete, even if training was many years ago.
- Paroxysmal tachycardia can last a few minutes to several hours. It might be too transient to allow an ECG recording during an attack so that only clinical examination is available.
- Paroxysmal atrial fibrillation (AF) or, more rarely, atrial flutter, produces a ventricular rate that is dependent upon the refractory time of the A-V node.
- Re-entry tachycardia such as Wolff-Parkinson-White syndrome can produce a very fast rate in the region of 200 bpm.
- As a general rule, supraventricular tachycardia (SVT) produces a rate above 160 bpm and ventricular tachycardia (VT) below 160 bpm.
- Even in young people, very fast rates of 200 bpm or more can precipitate heart failure.
What is the pulse rhythm?
- Sinus arrhythmia is when there is variation of rate with breathing. It accelerates a little on inspiration and slows a little on expiration. This can be quite marked in children and adolescents but is uncommon over the age of 30. It can persist a little longer in the physically fit.
- The pulse slows on inspiration in pulsus paradoxus and it can occur with pericardial effusion, constrictive pericarditis and severe pneumothorax, especially tension pneumothorax, severe asthma and severe chronic obstructive pulmonary disease (COPD).1 In normal circumstances, the systolic blood pressure often falls slightly, by less than 10 mm Hg on inspiration, but in pulsus paradoxus it falls by more than this. This fall can be used to assess the severity of cardiac tamponade.2
- Irregularity is more difficult to discern if the rate is fast.
- Note if it is regularly irregular of irregularly irregular:
- Variable heart block or premature ventricular excitation will cause either an extra beat or a missed one. Premature ventricular contraction may cause a missed beat because the ventricle has not had time to fill adequately and so the stroke volume is low. The beat following a missed beat, whether due to premature excitation or failure of the ventricle to beat, may be rather stronger than the others, as the ventricle has filled more in the longer diastole. This irregularity will follow a regular pattern.
- A much more random irregularity is a feature of AF. If the rate is fast in AF, it may be difficult to note if the irregularity is random or even if there is irregularity at all. It may be helpful to measure the rate at both the cardiac apex and the wrist and in AF there is usually a deficit at the radial pulse. This is usually done with two people timing simultaneously but it can be done alone, not timing but merely noting if the rates differ. The rate in AF and the rarer atrial flutter depends upon the degree of A-V block but it can be very fast.
- It has been suggested that a way to distinguish between causes of irregularity is to get the patient to exercise to increase the pulse rate. In premature ventricular excitation it will reduce or disappear. In AF it will increase the irregularity or at least not reduce it.
- Currently, most clinicians would use the ECG for a more reliable means of distinction.
What is the character of the pulse?
Finally, note the character of the pulse. This incorporates an assessment of the pulse volume (the movement imparted to the finger by the pulse) and what has been described as the ‘form of the pulse wave’. The pulse character must be interpreted in the light of pulse rate.
- Cardiac output is the product of stroke volume and heart rate. Thus, a slow pulse may be associated with a high stroke volume and, as there is a long time between each ejection, the pulse pressure (the difference between systolic and diastolic pressure) will be high.
- In shock, the pulse will be fast but weak. This might be from hypovolaemia or cardiogenic. In congestive heart failure one of the first features is tachycardia.
- A hyperdynamic circulation occurs in emotion, heat, exercise, anxiety, pregnancy, fever, anaemia and thyrotoxicosis. The pulse rate is raised but the pulse is full and bounding. Cardiac output is high and peripheral resistance is low.
- Disease of the aortic valve will affect the nature of the pulse wave.
- In aortic stenosis, the wave is slow to rise and the pattern of the arterial pressure is rather flat – the slow rising pulse.
- In aortic regurgitation, the stroke volume is high because a significant amount of blood sinks back into the ventricle and has to be pumped again. Furthermore, the incompetent valve will let the arterial pressure fall markedly in diastole. Hence, a bounding, dynamic pulse collapses to give a very wide pulse pressure. This is called a collapsing or water hammer pulse. The water hammer is a piece of Victorian engineering that is rarely seen these days. The collapse of the pulse pressure can be felt with even greater effect if the patient’s hand is raised over his head so that the radial artery is palpated at a level rather above the heart. Severe aortic regurgitation, classical of syphilitic aortitis, can cause the head to jerk with each pulse (de Musset’s sign).
- In mild aortic stenosis with reflux, the pulse detected may have two peaks as well as being slow rising. This is the so called bisferiens pulse.
- Khasnis A, Lokhandwala Y, Clinical signs in medicine: pulsus paradoxus. J Postgrad Med 2002;48:46-9
- Curtiss EI, Reddy PS, Uretsky BF, et al; Pulsus paradoxus: definition and relation to the severity of cardiac tamponade. Am Heart J. 1988 Feb;115(2):391-8. [abstract]
- Royal College of Physicians; Traditional logo
- Royal College of Physicians; Updated logo
Internet and further reading
Acknowledgements EMIS is grateful to Dr Hayley Willacy for writing this article and to Dr Richard Draper for earlier versions. The final copy has passed scrutiny by the independent Mentor GP reviewing team. ©EMIS 2011.
Document ID: 1717
Document Version: 23
Document Reference: bgp1830
Last Updated: 28 Feb 2011