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Pulse, Blood Pressure and Jugular Venous Pulse

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Pulse, Blood Pressure and Jugular Venous Pulse CHAPTER Back to Bedside Basics - Pulse, Blood Pressure and Jugular Venous Pulse 195 Ruchit A Shah, BR Bansode INTRODUCTION peak is palpable. Percussion wave is more prominent than In the era of electrocardiogram and echocardiography, the tidal wave. Anacrotic notch, tidal wave, dicrotic notch clinical bedside examination is a forgotten art. However and dicrotic wave are not palpable. accurate these investigations may be, evaluation of As the pulse wave travels from aortic valve to the peripheral the patient is incomplete without a detailed physical arteries; i) the upstroke becomes steeper, ii) systolic peak examination. In this chapter we shall discuss the basic becomes high, iii) systolic upstroke time becomes shorter, bedside art and clinical relevance of examination of the iv) ejection time increases, v) systolic pressure increases, arterial pulse, blood pressure and jugular venous pulse. vi) pulse pressure increases, vii) diastolic pressure THE ARTERIAL PULSE decreases, viii) mean pressure decreases, ix) anacrotic shoulder disappears, x) sharp incisura is replaced by a Physiology - The arterial pulse begins with aortic valve smoother and latter dicrotic notch, followed by a dicrotic opening and ejection of blood from the left ventricle into wave. The carotid artery is a large artery close to the aortic the aorta. The nature of arterial pulse depends on left valve and its contour resembles that of central aortic pulse. ventricular stroke volume, ejection velocity, compliance, Hence the carotid pulse and not the peripheral pulse is distensiblity and capacity of arterial system. The pulse used to assess the volume and contour (Table 1). contour is a result of frequency waves produced by antegrade blood flow and reflection of the waves returning With aging, arteriosclerosis and hypertension, there is from the peripheral circulation. decreased compliance, increased vascular resistance and vasoconstriction of the arterial tree. The noncompliant The central aortic pulse wave is described as early systolic, arterial tree contributes to increased pulse wave velocity late systolic and diastolic component (Figure 1). The and the tidal wave becomes more sustained. early systolic component (percussion wave) has a rapid upstroke. It is due to early systolic ejection of blood which Examination - Varying degrees of pressure is applied with is stored in central aorta. The normal pulse has a brief the finger pads of the thumb or first two fingers to assess crest which is slightly sustained and somewhat rounded. upstroke, systolic peak and diastolic slope of the pulse The mid and late systolic component (anacrotic notch (trisection method). Attempt should be made to assess the and shoulder) has a rounded summit or peak. It is due to rate, rhythm, volume, amplitude, contour and stiffness of propagation of blood from central aorta to periphery and the arterial wall. Focus on the speed and quality of early reflection of the waves from the upper limbs. Diastole is rise, peak and drop off of the arterial pulse. initiated by a negative wave (dicrotic notch). The nadir A. Rate and Rhythm - This information is derived of dicrotic notch coincides with aortic leaflet closure (A2 from the radial artery. Count the arterial pulse for component of S2) and the positive wave is due to reflection 15 s and multiply by 4 to get the pulse rate. The of waves from the lower limbs. Normally only the systolic heart rate should be compared with the pulse rate. A pulse deficit of >6 beats/min is suggestive Table 1: Comparison of the pulse in central aorta and peripheral artery Central artery (Aorta) Peripheral artery (Brachial) i. Upstroke has a i. Steep upstroke rounded dome ii. Anacrotic notch on ii. Disappearance of ascending limb anacrotic notch on ascending limb iii. Descending limb has iii. Incisura in descending Fig. 1: Normal arterial pulse. Note the rapid upstroke of incisura followed by limb is by dicrotic percussion wave, rounded peak of tidal wave and fall off in late replaced dicrotic wave notch followed systole. The dicrotic notch coincides with S2 by dicrotic wave 890 Table 2: Causes of tachycardia and bradycardia Tachycardia (>100 beats Bradycardia (<60 beats per minute) per minute) a. Sinus tachycardia a. Sinus Bradycardia i. Physiological - i. Physiological - Infancy, Early Athletes, during sleep childhood, exercise, anxiety, excitement ii Pharmacological ii. Pharmacological - Beta - Amyl nitrate, blockers, propafenone, amiodarone, Lithium epinephrine, isoproterenol, ephedrine, atropine, CARDIOLOGY alcohol, nicotine, caffeine iii. Pathological - Cardiac iii. Pathological - Cardiac - Heart failure, acute - Inferior wall myocardial infarction, myocardial infarction, pulmonary embolism, vasovagal syncope, myocarditis, shock sinoatrial block, post Non cardiac - Fever, cardiac transplant thyrotoxicosis, Non cardiac - anemia, hemorrhage, myxedema, raised hypotension, hypoxia intracranial pressure, hypothermia, obstructive jaundice, enteric fever, sepsis, Chagas disease Fig. 2: Carotid pulse waveforms and heart sounds. A - Normal, B b. Tachyarrhythmia - b. Bradyarrhythmia - - Severe Aortic stenosis - anacrotic pulse with slow upstroke, C - Atrial fibrillation, complete heart block, Severe aortic regurgitation - bifid pulse with two systolic peaks, atrial tachycardia, second degree AV D - Hypertrophic obstructive cardiomyopathy - bifid pulse with supraventricular block. spike and dome pattern, E - Dicrotic pulse - one peak in systole, tachycardia, another in diastole ventricular of atrial fibrillation and <6 beats/min is suggestive tachycardia of premature ventricular contraction. The normal pulse occurs at regular intervals. When the cycle Table 3: Irregular pulses length shortens with inspiration and lengthens Regularly irregular Irregularly irregular with expiration by >120 ms during quiet breathing, i. Sinus arrhythmia i. Atrial fibrillation it is called sinus arrhythmia. It is associated with autonomic dysfunction and is a risk factor for ii. Pulsus bigeminy ii. Multifocal atrial sudden cardiac death. Normal sinus rhythm varies tachycardia between 60-100 beats per minute (Tables 2, 3). iii. Pulsus alternans iii. Frequent premature ventricular B. Character and volume of the pulse (Figure 2) contractions a. Hyperkinetic (Bounding) Pulse - It has larger iv. 1st and 2nd degree pulse wave amplitude. It is due to increase in heart block left ventricular ejection, stroke volume, arterial Differentiating between irregular pulses pressure, sympathetic activity or decreased arterial Ventricular premature complex - There is a large pause compliance. It is seen in i) elderly subjects with following the premature beat. arteriosclerosis and systolic hypertension, ii) Atrial premature complex - There is a short pause anxiety, iii) anemia, iv) thyrotoxicosis, v) exercise, following two beats vi) hot and humid environment, vii) alcohol intake Atrial fibrillation - Irregular in rate and rhythm with and viii) high output states with increased distal apex pulse deficit of >6 beats/min. arterial runoff like aortic regurgitation, patent ductus arteriosus, large A-V fistula, Paget’s disease and severe cirrhosis. b. Hypokinetic Pulse - A small or diminished pulse two pulse waves. It is better appreciated during 891 is due to low cardiac output with reduced left inspiration. It is seen in young patients having ventricular stroke volume, shorter left ventricular cardiomyopathy with severe left ventricular ejection time or intense vasoconstriction. An dysfunction, low cardiac output, low blood pressure, unsustained pulse suggests decreased stroke high systemic vascular resistance, tachycardia, volume without left ventricular outflow during inspiration in pericardial tamponade, post obstruction, whereas a slow rising sustained valve replacement for aortic or mitral regurgitation pulse of small volume suggests aortic stenosis. It with left ventricular dysfunction and occasionally is seen in i) severe left ventricular dysfunction, ii) with fever in young. congestive cardiac failure, iii) hypotension and iv) e. Pulsus alternans - It is present during sinus rhythm left ventricular outflow tract obstruction. when patient’s peak systolic arterial pressure and c. Pulsus parvus et tardus - It is a slow rising pulse pulse volume are alternately strong and weak. CHAPTER 195 with delayed systolic peak and upstroke. It is best It occurs due to beat to beat alteration in left appreciated with simultaneous auscultation and ventricular ejection pressure and signifies severe carotid palpation. In aortic stenosis, it is associated left ventricular dysfunction. (It is not related with a carotid thrill (carotid shudder). to electrical alternans which has a beat to beat variation in the amplitude of QRS complex as seen in d. Water Hammer (Collapsing pulse) or Corrigan massive pericardial effusions). It is best appreciated pulse or Pulsus Celer - This term was coined clinically in the radial or brachial arteries. It may be by Thomas Watson after a Victorian toy which associated with signs of heart failure like S3 gallop. comprised of a glass vessel partly filled with water It can also be detected by slow decompression of and vacuum. It produces a slapping impact on the sphygmomanometer cuff while listening to being turned over. In aortic regurgitation, there the alteration of Korotkoff sounds. When systolic is an early, brief peak and a swift descent without pressure alternates by >20 mm Hg it can be detected dicrotic notch which gives a collapsing sensation. by palpation of the peripheral
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