3.4 Cardiovascular Examination

3.4 Cardiovascular Examination

Quick Answer: The cardiovascular examination assesses blood pressure, pulses, heart sounds, and peripheral edema to screen for cardiac and vascular disease. On Part III, this section also carries direct safety weight: asymmetric pulses, unequal blood pressure between arms, or carotid bruits are vascular red flags that must be identified before cervical spine manipulation is performed.

The cardiovascular examination provides both a general medical screen and a direct safety checkpoint for chiropractic treatment planning, particularly for cervical procedures. Part III questions in this domain typically present a vital sign or pulse/auscultation finding and ask you to identify the underlying pathology or the appropriate next step, including whether manipulation should proceed.

Blood Pressure Assessment

Blood pressure is measured with an appropriately sized cuff on a seated, rested patient, ideally in both arms at the initial visit.

A difference of more than 10-15 mmHg systolic between the two arms is abnormal and raises concern for subclavian artery stenosis or, in a severe or acute presentation, aortic dissection. Orthostatic hypotension is defined as a drop of 20 mmHg or more systolic or 10 mmHg or more diastolic within a few minutes of standing from a supine position, and suggests volume depletion, autonomic dysfunction, or medication effect.

Pulse Examination

Peripheral pulses are palpated for rate, rhythm, amplitude, and symmetry.

A pulse deficit (a palpable difference in timing or strength between two sites, such as radial versus femoral) suggests aortic coarctation or dissection. Pulsus paradoxus (an exaggerated fall in systolic pressure during inspiration) suggests cardiac tamponade or severe asthma/COPD. Weak or absent distal pulses (posterior tibial, dorsalis pedis) with cool, shiny skin suggest peripheral arterial disease.

Heart Sounds and Auscultation

Auscultation is performed systematically over the four cardiac valve areas.

S1 marks the closure of the mitral and tricuspid valves (beginning of systole); S2 marks closure of the aortic and pulmonic valves (beginning of diastole). Additional or abnormal sounds include:

• S3 -- a low-pitched sound after S2, often normal in young healthy patients but suggestive of heart failure or volume overload in older adults
• S4 -- a sound just before S1, associated with a stiff, non-compliant ventricle (e.g., from chronic hypertension)
• Murmurs -- turbulent flow sounds, classified as systolic (occurring between S1 and S2, as in aortic stenosis or mitral regurgitation) or diastolic (occurring between S2 and S1, as in aortic regurgitation or mitral stenosis); diastolic murmurs are more consistently associated with structural heart disease

Peripheral Edema

Edema is assessed by pressing over the tibia or dorsum of the foot and observing for persistence of the indentation (pitting) versus non-pitting edema (more typical of lymphedema or myxedema).

Bilateral pitting edema most often reflects a systemic cause -- heart failure, renal disease, hepatic disease, or venous insufficiency -- while unilateral edema, especially with calf tenderness and warmth, raises concern for deep vein thrombosis (DVT) and should prompt urgent referral rather than manual treatment of the leg.

Vascular Screening Before Cervical Manipulation

Because cervical manipulation involves rotational and extension forces near the vertebral and carotid arteries, the cardiovascular exam doubles as a pre-treatment safety screen:

• Bilateral blood pressure -- a significant arm-to-arm difference suggests subclavian stenosis or dissection and should delay manipulation pending vascular workup.
• Carotid auscultation -- a bruit suggests atherosclerotic disease and raises overall vascular risk.
• Pulse symmetry -- asymmetric or diminished pulses anywhere suggest a broader vascular process that increases the risk calculus for manipulation.
• Correlating with cranial nerve/VBI findings -- vascular red flags found here should always be considered together with the five Ds and three Ns screen from the head and neck exam; the two systems reinforce each other rather than standing alone.

A patient with a normal cardiovascular screen and no VBI symptoms supports proceeding with treatment as clinically indicated; any combination of vascular risk factors, bruits, asymmetric pulses, or neurologic symptoms should shift management toward referral and away from high-velocity cervical techniques.

Putting It Together: Cardiovascular Red Flags

Exam Tips

• Memorize the blood pressure categories exactly (130/80 and 140/90 are the two thresholds most often tested).
• Bilateral versus unilateral edema is a fast, high-yield way to separate systemic disease from local vascular pathology (e.g., DVT).
• Treat any vascular red flag (bruit, pulse deficit, BP asymmetry) as directly relevant to the safety of cervical manipulation, not just as an isolated cardiovascular finding.