Pulse — Masterclass
🔵 Technique & bedside method · 🟣 Physiology/why · 🟡 Clinical pearl · 🟠 Viva/exam presentation · 🔴 Pitfall/red flag · 🟢 Rapid revision
Foundation & physiology
The arterial pulse is the palpable pressure wave produced by left-ventricular ejection and propagated through the arterial tree. What the finger feels is not the movement of an individual column of blood from the heart to the wrist, but a pressure wave whose contour is influenced by stroke volume, ventricular ejection velocity, arterial compliance, peripheral resistance and reflected waves. Always interpret the pulse together with blood pressure, perfusion, JVP, heart sounds and the clinical state.
How to examine
Ensure the patient is rested and the limb supported. Begin at the radial artery using the pads of the index and middle fingers. Assess rate, rhythm, volume and character; compare both radial pulses; look for radio-radial delay; compare radial with femoral pulse for radio-femoral delay. Assess the brachial and carotid pulses when character is important. Never palpate both carotids simultaneously. Examine the arterial wall when appropriate and complete the peripheral vascular examination if asymmetry or vascular disease is suspected.
Rate
If regular, count for at least 30 seconds and multiply by two; count for a full minute when slow, fast or irregular. Tachycardia may be physiological or occur with fever, pain, anxiety, hypovolaemia, anaemia, sepsis, thyrotoxicosis, heart failure and arrhythmias. Bradycardia may be physiological in trained people or occur with drugs, hypothyroidism, hypothermia, raised intracranial pressure, sinus-node disease or AV block. Rate alone never establishes the rhythm diagnosis.
Rhythm & pulse deficit
Decide whether the pulse is regular, regularly irregular or irregularly irregular. Respiratory sinus arrhythmia varies cyclically with breathing. Ectopics can produce a regularly or randomly interrupted rhythm. Atrial fibrillation classically produces an irregularly irregular pulse with varying volume. To determine pulse deficit, one examiner counts the apical heart rate while another simultaneously counts the radial pulse for one minute; apical rate minus radial rate is the pulse deficit. A deficit occurs when some ventricular contractions generate insufficient stroke volume to produce a palpable peripheral wave.
Volume & amplitude
Pulse volume reflects the change in arterial pressure during systole and is influenced particularly by stroke volume and pulse pressure. A low-volume pulse occurs in low-output states such as hypovolaemia, shock, severe LV dysfunction and severe aortic stenosis. A bounding pulse may occur with increased stroke volume or reduced systemic vascular resistance, for example fever, anaemia, pregnancy, thyrotoxicosis and significant aortic regurgitation.
Character: slow-rising/anacrotic
A slow-rising, low-amplitude pulse suggests obstruction to LV outflow, classically severe aortic stenosis. The carotid upstroke is delayed and diminished (pulsus parvus et tardus). A palpable anacrotic notch may occasionally be appreciated. Correlate with a sustained apex, ejection systolic murmur radiating to the carotids and other features of aortic stenosis.
Character: collapsing pulse
A collapsing or water-hammer pulse has a brisk upstroke followed by rapid collapse, reflecting a wide pulse pressure. It is classically associated with significant aortic regurgitation but may also be accentuated in high-output states. Assess with the patient's arm elevated after ensuring no contraindication; do not diagnose aortic regurgitation from pulse character alone.
Special pulses
Pulsus alternans is beat-to-beat alternation in pulse amplitude despite a regular rhythm and suggests severe LV systolic dysfunction. Pulsus bigeminus results from alternating normal and premature beats. Pulsus bisferiens has two systolic peaks and can occur in mixed aortic stenosis/regurgitation or hypertrophic obstructive cardiomyopathy. A dicrotic pulse has a prominent diastolic wave and may occur in low-output states. These are advanced signs and should be correlated with auscultation and haemodynamics.
Pulsus paradoxus
Pulsus paradoxus is an exaggerated inspiratory fall in systolic BP, conventionally >10 mmHg. It is measured with a sphygmomanometer by identifying the pressure at which Korotkoff sounds are heard only during expiration and then the pressure at which they are heard throughout respiration; the difference is the pulsus paradoxus. It is important in cardiac tamponade and may occur in severe obstructive airway disease and other states with marked ventricular interdependence.
Pulse delays & asymmetry
Radio-radial delay suggests unequal arterial transmission and should prompt consideration of proximal arterial disease or aortic pathology in the appropriate context. Radio-femoral delay is a classic clue to coarctation of the aorta. Unequal pulse volume between limbs requires vascular assessment and correlation with bilateral BP. Always interpret new asymmetry in the clinical context.
Examiner presentation
A useful bedside presentation is: 'The pulse is 84 per minute, regular, normal in volume and character, with no radio-radial or radio-femoral delay and no peripheral pulse deficit.' State abnormal findings precisely rather than using vague terms such as 'pulse good'.
Rapid revision
Pulse = rate + rhythm + volume + character + equality/delay + arterial wall + peripheral pulses. Irregularly irregular → consider AF. Slow-rising low-volume carotid → aortic stenosis. Collapsing pulse → wide pulse-pressure state, especially AR. Alternans → severe LV dysfunction. Radio-femoral delay → consider coarctation. Pulsus paradoxus → quantify with BP cuff.
Blood Pressure — Masterclass
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Physiological basis
Arterial blood pressure is determined by the interaction of cardiac output, systemic vascular resistance, arterial compliance and circulating volume. Cardiac output equals heart rate × stroke volume. Systolic pressure is strongly influenced by stroke volume and large-artery compliance; diastolic pressure is strongly influenced by peripheral resistance and heart rate. A BP number must therefore be interpreted as a haemodynamic sign, not an isolated diagnosis.
Preparation
Whenever feasible, avoid measurement immediately after exertion, smoking/caffeine or acute distress. Seat the patient with back supported, feet uncrossed and supported, arm bare and supported near heart level. Allow a period of rest. Use validated equipment and an appropriately sized cuff. Inaccurate positioning and cuff size can produce clinically important errors.
Cuff selection
The inflatable bladder must appropriately encircle the arm. A cuff that is too small tends to overestimate BP; a cuff that is too large may underestimate it. Measure mid-arm circumference when uncertainty exists and follow the cuff/device manufacturer's validated range. Do not place the cuff over thick clothing.
Palpatory systolic BP
Palpate the radial pulse while inflating the cuff until the pulse disappears, then inflate approximately 20–30 mmHg further and slowly deflate. The pressure at which the pulse returns estimates systolic BP. This step helps avoid missing an auscultatory gap and tells you how high to inflate during auscultatory measurement.
Auscultatory method
Place the stethoscope over the brachial artery without excessive pressure. Inflate above the palpatory systolic estimate and deflate slowly, approximately 2–3 mmHg per second. The first repetitive Korotkoff sound (phase I) marks systolic pressure in adults. Disappearance of sounds (phase V) usually marks diastolic pressure. Record the value, arm, position and relevant circumstances.
Korotkoff phases
Phase I: first clear tapping sounds. Phase II: softer swishing sounds. Phase III: crisper/louder sounds. Phase IV: muffling. Phase V: disappearance. Understanding the phases prevents confusion when sounds change quality. In situations where sounds persist toward zero, phase IV may sometimes provide additional information, but routine adult DBP generally uses phase V.
Auscultatory gap
An auscultatory gap is a transient disappearance of Korotkoff sounds during cuff deflation, often between systolic and diastolic pressures. If the palpatory systolic pressure is not determined first, the observer can underestimate systolic BP or overestimate diastolic BP. This is a classic bedside-examination trap.
Both arms & repeated measurements
At an initial assessment, measure BP in both arms when feasible. A persistent clinically meaningful inter-arm difference should be confirmed and evaluated in context; subsequent measurements generally use the arm with the higher reading. Diagnosis of chronic hypertension should not rest on one casual measurement unless the clinical situation requires immediate action.
Orthostatic BP
Measure BP and pulse after supine rest and again after standing, commonly at 1 and 3 minutes. A sustained fall in systolic BP ≥20 mmHg or diastolic BP ≥10 mmHg within 3 minutes is a standard definition of orthostatic hypotension. Symptoms matter. Consider volume depletion, autonomic dysfunction and medications, among other causes. In patients with supine hypertension, larger systolic falls may be used in specialist definitions.
Pulse pressure & MAP
Pulse pressure = SBP − DBP. A wide pulse pressure may occur with arterial stiffness or high stroke-volume/runoff states such as aortic regurgitation; a narrow pulse pressure can accompany low stroke volume. Mean arterial pressure is often approximated as DBP + one-third pulse pressure at normal heart rates. In critical illness, MAP is useful for perfusion assessment but should be integrated with mental status, urine output, skin perfusion, lactate and organ function.
Common measurement errors
Talking, unsupported arm, dangling feet, crossed legs, full bladder, recent exertion, wrong cuff size, rapid deflation, terminal-digit rounding and repeated measurements without adequate technique all impair accuracy. Arrhythmias can make automated readings less reliable; repeated careful measurements and clinical correlation may be required.
Special contexts
Pregnancy, severe obesity, very thin arms, arrhythmias, shock and vascular disease require particular care. In shock, a seemingly acceptable cuff BP does not exclude tissue hypoperfusion. In atrial fibrillation, obtain repeated measurements because beat-to-beat stroke volume varies. Suspected hypertensive emergency is defined by acute target-organ injury, not simply by an extremely high number.
Examiner presentation
Present BP with context: 'Blood pressure is 128/76 mmHg in the right arm, measured seated with an appropriate cuff; there is no significant postural fall.' If abnormal, state repeat values and symptoms rather than prematurely labelling the patient from one reading.
Rapid revision
Correct patient + correct arm position + correct cuff + palpatory SBP + slow deflation + Korotkoff I/V. Check both arms initially. Think postural BP when indicated. Pulse pressure = SBP−DBP. MAP ≈ DBP + ⅓(PP). Never interpret BP without perfusion and clinical context.
Respiratory Rate — Masterclass
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Why RR matters
Respiratory rate is one of the earliest and most sensitive bedside indicators of physiological deterioration. It integrates respiratory drive, gas exchange, metabolic demand, acid-base status, pain, fever and neurological function. A normal SpO₂ does not make an abnormal respiratory rate unimportant, particularly when supplemental oxygen is being used.
How to measure
Ideally count respirations without drawing attention to the measurement because conscious control can alter breathing. After taking the pulse, keep the hand in position and observe chest or abdominal movement. One inspiration plus one expiration equals one breath. Count for 30 seconds when regular and for a full minute when abnormal or irregular. Document oxygen/device and patient state.
What to observe beyond the number
Assess rate, rhythm, depth, inspiratory-to-expiratory relationship, work of breathing, ability to speak, accessory-muscle use, nasal flaring, tracheal tug, recession, thoracoabdominal synchrony and audible respiratory sounds. The trajectory over time may be more informative than a single measurement.
Tachypnoea
Tachypnoea may reflect hypoxaemia, pneumonia, pulmonary oedema, pulmonary embolism, asthma/COPD exacerbation, metabolic acidosis, fever, pain, anxiety, anaemia, sepsis or shock. A rising RR can precede overt hypotension or desaturation. Always ask what physiological stimulus is driving ventilation.
Bradypnoea
Bradypnoea may occur with opioid/sedative effect, central neurological depression, severe hypothyroidism, hypothermia or impending respiratory arrest. A falling respiratory rate in a tiring patient is not necessarily improvement; if accompanied by reduced consciousness or decreasing tidal volume it can signal exhaustion.
Kussmaul breathing
Kussmaul respiration is deep, laboured hyperventilation associated classically with severe metabolic acidosis, especially diabetic ketoacidosis. The respiratory system is attempting to lower PaCO₂ to compensate for reduced bicarbonate. Recognising the pattern should trigger urgent assessment of acid-base status and the underlying cause rather than treatment of the breathing pattern itself.
Cheyne–Stokes respiration
Cheyne–Stokes breathing consists of cyclical crescendo-decrescendo ventilation separated by apnoea or marked hypopnoea. It reflects instability in ventilatory feedback with delayed circulation/response and can be seen in advanced heart failure and certain neurological conditions, as well as during sleep in susceptible individuals.
Biot/ataxic breathing
Ataxic breathing describes a markedly irregular pattern with variable depth and periods of apnoea, traditionally associated with medullary dysfunction. Terminology around 'Biot breathing' is inconsistently used; in bedside teaching, describe exactly what you observe rather than relying only on an eponym.
Apneustic & central patterns
Apneustic breathing classically refers to prolonged inspiratory pauses and is associated in classical neurological teaching with pontine injury. Central neurogenic patterns are uncommon bedside diagnoses and should be interpreted with neurological examination, medications, metabolic abnormalities and ventilatory data.
Obstructive pattern
Prolonged expiration, accessory-muscle activity, pursed-lip breathing and dynamic hyperinflation may accompany obstructive airway disease. A patient with severe asthma who becomes quieter, exhausted, confused or develops a falling respiratory effort may be deteriorating despite less obvious wheeze.
Thoracoabdominal paradox
Paradoxical or asynchronous chest-abdominal movement suggests increased respiratory load, diaphragmatic dysfunction or fatigue depending on context. In an acutely ill patient it should increase concern for impending ventilatory failure and prompt assessment of gas exchange and ventilatory support requirements.
RR, SpO₂ and ABG
RR describes ventilatory response, SpO₂ estimates arterial oxygen saturation, and ABG provides information on oxygenation, ventilation and acid-base status. They answer different questions. A patient may have marked tachypnoea from metabolic acidosis with preserved oxygen saturation; conversely oxygen can normalize SpO₂ while hypercapnic ventilatory failure worsens.
Red flags
Escalate concern for rapidly rising or very low RR, exhaustion, altered sensorium, cyanosis, inability to speak, silent chest in severe asthma, paradoxical breathing, haemodynamic instability, refractory hypoxaemia or signs of impending arrest. Use the complete clinical picture rather than a single threshold.
Examiner presentation
Example: 'Respiratory rate is 26 per minute, regular and moderately deep, with increased work of breathing and accessory-muscle use; the patient is receiving oxygen via nasal cannula.' This is much more informative than stating 'RR 26' alone.
Rapid revision
Never record only the number. RR assessment = rate + rhythm + depth + effort + pattern + oxygen/device + trend. Kussmaul → metabolic acidosis. Cheyne–Stokes → cyclical crescendo-decrescendo with apnoea. Falling RR with exhaustion can be ominous. SpO₂ and RR are complementary, not interchangeable.
Temperature — Masterclass
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Thermoregulation
Core temperature reflects the balance between heat production and heat loss under hypothalamic regulation. Heat is produced by basal metabolism, muscular activity and shivering and is lost through radiation, convection, conduction and evaporation. Circadian rhythm, age, activity, hormonal state and measurement site influence observed temperature.
Fever mechanism
In fever, inflammatory mediators stimulate pyrogenic pathways that raise the hypothalamic thermoregulatory set point, largely through prostaglandin E₂ signalling. The patient initially feels cold because the body is below the new set point, producing vasoconstriction and shivering. When the set point falls, vasodilation and sweating promote heat loss.
Fever vs hyperthermia
Fever is a regulated rise in temperature caused by an elevated hypothalamic set point. Hyperthermia is an unregulated increase in body temperature despite no upward reset of the set point, as in heat stroke or certain drug/toxin syndromes. This distinction matters because severe hyperthermia requires rapid physical cooling and cause-specific emergency management; antipyretics do not correct the underlying mechanism.
Measurement sites
Oral, axillary, tympanic, temporal and rectal/core methods have different accuracy and practical limitations. Site, device technique and environmental factors affect readings. Axillary temperature is convenient but less reflective of core temperature; rectal measurement approximates core temperature more closely but is invasive and unsuitable in some situations. Trends should ideally use a consistent method.
How to document
Record the actual value, measurement site/method when relevant, time and clinical context. A statement such as 'temperature 38.4°C orally' is more reproducible than simply writing 'febrile'. Serial temperature trends are often more clinically useful than one isolated value.
Fever patterns
Traditional descriptions include continuous/sustained, remittent, intermittent and relapsing fever. Some classical diseases are associated with characteristic patterns, but modern diagnosis should not rely on fever pattern alone because antipyretics, antibiotics, host factors and measurement frequency alter the curve. Use patterns as clues, not diagnostic proof.
Relative bradycardia
Relative bradycardia describes a pulse rate lower than expected for the degree of fever. It has classical associations with selected infections and noninfectious conditions, but it is neither sufficiently sensitive nor specific to diagnose an illness. Drugs affecting heart rate and conduction must be considered.
Hyperpyrexia & severe hyperthermia
Very high temperatures warrant urgent assessment for severe infection, CNS pathology, heat illness and drug/toxin syndromes according to context. Neurological dysfunction with environmental heat exposure raises concern for heat stroke, a medical emergency requiring immediate cooling and organ-supportive management.
Hypothermia
Hypothermia is a core temperature below 35°C. Clinical severity depends on temperature, duration and comorbidity. Shivering may be prominent early and can disappear with worsening hypothermia. Bradycardia, slowed cognition, dysrhythmias and haemodynamic instability may develop. Handle significantly hypothermic patients carefully and rewarm according to severity and resources.
Drug and syndrome associations
Consider serotonin toxicity, neuroleptic malignant syndrome, malignant hyperthermia, sympathomimetic toxicity, anticholinergic toxicity and drug fever when the history and accompanying neuromuscular/autonomic findings fit. Do not label every high temperature as infection.
Clinical interpretation
Temperature should be integrated with pulse, RR, BP, perfusion, mental status, hydration, exposure history, medications and localising symptoms. Older adults and immunocompromised patients may have serious infection without impressive fever; absence of fever therefore does not exclude sepsis.
Examiner presentation
Example: 'Temperature is 38.6°C measured orally; the patient is tachycardic and tachypnoeic but haemodynamically stable.' When relevant, add the trend and timing of antipyretics rather than presenting the temperature in isolation.
Rapid revision
Fever = raised hypothalamic set point; hyperthermia = uncontrolled heat accumulation without set-point elevation. Always state value + site/method when relevant. Fever patterns are clues, not diagnoses. Hypothermia <35°C can impair consciousness and cardiac stability. Interpret temperature with the other vital signs.
JVP & Neck Veins — Masterclass
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Why JVP is valuable
The jugular venous pulse provides a bedside window into right-atrial pressure and right-heart haemodynamics. It is not simply a measurement of 'fluid status'. Its height, waveform and respiratory response can provide clues to right-sided filling pressure, tricuspid valve disease, rhythm disturbances, pericardial disease and ventricular interaction.
Anatomical basis
The right internal jugular vein has a relatively direct route to the superior vena cava and right atrium and is preferred for waveform assessment. The external jugular vein may be easier to see but is more affected by valves, kinking and local compression. Use the right IJV whenever possible for formal assessment.
Positioning
Position the patient comfortably, usually reclining around 30–45°, with the head and neck relaxed and turned only slightly away. Use tangential light across the neck. Adjust the bed angle until the venous meniscus or pulsation is visible. In very high JVP the patient may need to sit more upright; in very low JVP a flatter position may be required.
JVP vs carotid
Jugular pulsation is usually non-palpable, has a complex/biphasic waveform, varies with respiration and position, and can often be obliterated by gentle pressure above the clavicle. The carotid pulse is palpable, has a single brisk systolic upstroke and is not obliterated by light venous pressure. Never repeatedly compress the carotid merely to identify the JVP.
Measuring JVP
Identify the highest point of venous pulsation. Measure the vertical height above the sternal angle using a horizontal reference from the venous meniscus and a vertical ruler at the sternal angle. Traditionally, ≤3–4 cm above the sternal angle is considered within the usual bedside range, corresponding approximately to a right-atrial pressure around 8–9 cm H₂O after allowing for the distance from the sternal angle to the right atrium. Technique and patient anatomy influence accuracy.
Waveform overview
The normal JVP is described by positive a, c and v waves and negative x and y descents. The waveform reflects right-atrial contraction, tricuspid movement/ventricular systole, venous filling and right-atrial emptying. Learn it in relation to the ECG and heart sounds rather than memorising letters in isolation.
a wave
The a wave results from right-atrial contraction and occurs after the P wave, just before S1. It is absent in atrial fibrillation because there is no coordinated atrial contraction. A large/giant a wave occurs when the right atrium contracts against increased resistance to RV filling, for example pulmonary hypertension or tricuspid stenosis in appropriate contexts.
Cannon a waves
Cannon a waves occur when the right atrium contracts against a closed tricuspid valve because atrial and ventricular contractions are dissociated. They may be regular in complete heart block or intermittent in rhythms with variable AV dissociation, including some ventricular tachyarrhythmias. They are a striking example of how JVP can reveal rhythm physiology at the bedside.
c wave
The c wave occurs in early ventricular systole and is attributed mainly to bulging of the closed tricuspid valve toward the right atrium, with possible contribution from transmitted carotid pulsation. It is often difficult to identify clinically and should not be overcalled at the bedside.
x descent
The x descent follows atrial relaxation and is augmented by downward displacement of the tricuspid annulus during RV systole. A prominent x descent can be seen in cardiac tamponade, whereas it may be blunted in significant tricuspid regurgitation. Interpret waveform changes with the rest of the examination.
v wave
The v wave reflects right-atrial filling against a closed tricuspid valve during ventricular systole and peaks around/after S2 before the tricuspid valve opens. Large systolic v (or cv) waves suggest significant tricuspid regurgitation, often accompanied by systolic hepatic pulsation.
y descent
The y descent reflects rapid emptying of the right atrium into the right ventricle after the tricuspid valve opens. A rapid/prominent y descent is classically associated with constrictive pericarditis and can occur with severe TR; a blunted or absent y descent is classically described in cardiac tamponade.
Hepatojugular/abdominojugular reflux
Apply firm sustained pressure over the upper abdomen while observing the JVP. A transient rise can be normal; a sustained rise during continued pressure supports limited right-heart ability to accommodate increased venous return and can help identify elevated filling pressures. Avoid painful or excessively forceful pressure and interpret the test with baseline JVP.
Kussmaul sign
Kussmaul sign is a paradoxical rise, or failure of the JVP to fall appropriately, during inspiration. It indicates impaired right-sided filling and is classically associated with constrictive pericarditis, restrictive cardiomyopathy and right-ventricular dysfunction/infarction. It is not the typical finding of uncomplicated cardiac tamponade.
JVP in tamponade
Cardiac tamponade classically produces elevated JVP with prominent x descent and attenuated/absent y descent because early diastolic filling is constrained. Pulsus paradoxus may coexist. Bedside signs have imperfect sensitivity; suspected tamponade requires urgent echocardiographic and clinical assessment.
JVP in constrictive pericarditis
Constrictive pericarditis may produce elevated JVP, prominent/rapid y descent and Kussmaul sign. The abrupt cessation of ventricular filling creates characteristic haemodynamics. Distinguish it from tamponade and restrictive cardiomyopathy using the total clinical picture, imaging and haemodynamic studies when required.
JVP in tricuspid regurgitation
Significant TR may produce elevated JVP with large systolic v/cv waves, loss/blunting of the x descent and rapid y descent. The liver may be expansile/pulsatile in systole. Inspiratory augmentation of the murmur (Carvallo sign) can support the bedside diagnosis.
JVP in pulmonary hypertension/RV failure
Raised JVP may accompany RV failure. Pulmonary hypertension can generate prominent a waves when sinus rhythm is present because the right atrium contracts against a stiff/high-pressure RV. Look for parasternal heave, loud P2, peripheral oedema, hepatomegaly and other signs.
Rhythm correlations
AF → absent a waves. Complete heart block/AV dissociation → cannon a waves. Junctional or ventricular rhythms can also produce cannon waves depending on atrial-ventricular timing. Do not diagnose an arrhythmia from the neck alone; use the waveform as a physiological clue and confirm with ECG.
Low or non-visible JVP
A low JVP can support reduced right-sided filling pressure, for example hypovolaemia, but absence of visible pulsation may simply reflect technique, anatomy or lighting. Reposition the patient and use tangential illumination before concluding that venous pressure is low.
Common mistakes
Mistaking carotid pulsation for JVP, measuring along the skin rather than vertically, using an inappropriate bed angle, excessive head rotation, failing to identify a high JVP above the neck, assuming the external jugular always equals the IJV, and describing a waveform that was not actually seen are common errors. Good JVP examination rewards patience.
Bedside comparison: tamponade vs constriction
Tamponade: raised JVP, prominent x descent, impaired y descent; pulsus paradoxus often present. Constriction: raised JVP, prominent rapid y descent, Kussmaul sign often present. Both can cause systemic venous congestion, but their filling dynamics differ. Echocardiography is essential when clinically suspected.
Bedside comparison: constriction vs restriction
Both constrictive pericarditis and restrictive cardiomyopathy can cause elevated JVP and Kussmaul physiology. Clues from pericardial history/imaging, ventricular interaction, respiratory Doppler changes, tissue Doppler and cross-sectional imaging help differentiate them. The bedside examination should generate the differential rather than pretend to settle it alone.
How to present to examiner
Example: 'JVP is elevated at approximately 5 cm above the sternal angle at 45°. The waveform shows prominent v waves with a rapid y descent, and there is a positive hepatojugular reflux.' Then state the likely haemodynamic implication and correlate with cardiac findings.
Rapid revision
a = atrial contraction; absent in AF. Cannon a = atrium contracts against closed tricuspid valve/AV dissociation. x = atrial relaxation + systolic annular descent. v = atrial filling during ventricular systole; giant v suggests TR. y = early diastolic emptying; rapid in constriction, blunted in tamponade. Kussmaul = inspiratory rise/failure to fall in JVP due to impaired RV filling.