Macleod's examination of the cardiovascular system

General Examination of a Patient

Initial Assessment

• The examination begins with Amy introducing herself to Omar and asking for permission to examine him.

• Key observations during the general examination include assessing if the patient appears unwell, breathless, or distressed, as well as checking for any visible scars.

• A detailed inspection of the hands is performed to identify signs such as tobacco staining, peripheral cyanosis, splinter hemorrhages, Janeway lesions, Osler nodes, and finger clubbing.

Cardiovascular Examination Techniques

• Clubbing can indicate cardiovascular issues like cyanotic congenital heart disease and bacterial endocarditis.

• To assess the radial pulse: place three fingers over the right radial artery at the wrist; evaluate rate, rhythm, and volume by counting for 30 seconds and multiplying by two.

Blood Pressure Measurement

Procedure Overview

• The patient should be seated or lying down with their arm supported at heart level. An appropriately sized cuff is placed over the brachial artery.

• Inflate the cuff until the pulse becomes impalpable; this gives an estimate of systolic pressure. Further inflate by 30 mmHg before auscultation begins.

Auscultation Steps

• Slowly deflate the cuff while listening for sounds; note when tapping sounds begin (indicating systolic pressure).

• Continue deflating until sounds cease to determine diastolic pressure. More subtle features are discussed in literature.

Jugular Venous Pulsation Assessment

Technique Description

• Assessing JVP involves positioning the patient supine at a 45° angle and observing from one side in good light.

• The height of pulsation above the sternal angle indicates JVP; if uncertain, use abdominal jugular reflex or occlusion techniques.

Eye and Oral Examination

Key Observations

• Inspecting eyes for conditions like xanthelasma and corneal arcus is crucial.

• In oral examination: check for central cyanosis and dental caries by having the patient lift their tongue.

Precordium Inspection

Visual Inspection Techniques

• Inspect precordium while sitting at 45°, looking for surgical scars or visible pulsations.

• Locate apex beat typically found in fifth interspace medial to mid-clavicular line; assess its character during deep breathing exercises.

Palpation Techniques

• Feel for right ventricular heave using heel of hand in left parasternal area; assess thrills with flat fingers around apex and sternum.

Auscultation Techniques

Stethoscope Use

• Utilize stethoscope bell for low-pitched sounds (normal heart sounds); diaphragm is better suited for high-pitched sounds.

Heart Sounds Assessment

• Identify first/second heart sounds' character/intensity; note splitting of second sound.

• Time murmurs against carotid pulse while focusing on systole/diastole phases.

Murmur Identification

• Listen systematically across precordium using both bell & diaphragm:

• Apex best site for mitral murmurs;

• Lower left sternal border ideal for VSD murmur;

• Upper left/right borders useful for pulmonary/aortic stenosis murmurs respectively.

Specific Murmurs Evaluation

Mitral Regurgitation

• Pansystolic murmur often loud/blowing may radiate to left axilla.

Mitral Stenosis

• Best heard in left lateral position with mid-diastolic rumbling sound following opening snap.

Aortic Regurgitation

• Best assessed leaning forward during held expiration at left sternal edge third/fourth intercostal space.

Peripheral Vascular System Examination

Edema Check

• Examine superficial edema over sacrum using gentle pressure to check indentation after a few seconds.

Assessment of Abdominal and Lower Limb Vascular Health

Examination of the Abdominal Aorta

• Palpate over the abdominal aorta, located above the umbilicus; if easily palpable, consider an aneurysm. If uncertain, arrange for an ultrasound scan.

• A pulsatile mass below the umbilicus may indicate an iliac aneurysm; auscultate over the aorta for a bruit due to stenosis.

• Renal artery bruits cannot be differentiated from those in adjacent vessels like mesenteric arteries.

Inspection of Lower Limbs

• Inspect legs and feet for signs of ischemia and venous insufficiency; look for color changes, hair loss, surgical scars, and temperature differences.

• Pay attention to ulceration characteristics: position, margin, depth, and color. Check between toes and heels specifically for ischemic changes.

Palpation Techniques

• Begin palpating lower limb pulses with femoral pulses; explain procedure to patient. The femoral pulse is located below the inguinal ligament.

• Simultaneously palpate right femoral and radial pulses to check for radiofemoral delay—a sign of aortic coarctation. Use stethoscope diaphragm to listen for femoral artery bruits.

Assessing Popliteal Pulses

• Ensure patient is relaxed on a firm surface; flex knee at 30° while palpating popliteal artery in fossa—difficult to feel but easy detection may suggest an aneurysm.

• Locate posterior tibial pulse 2 cm behind and below medial malleolus using pads of middle three fingers.

Dorsalis Pedis Pulse Measurement

• Palpate dorsalis pedis pulse midway down dorsum of foot lateral to extensor hallucis longus tendon.

• Use Doppler probe for ankle-brachial pressure index measurement; perform Buerger's test by elevating patient's feet at 45 degrees for 2–3 minutes while observing palor or superficial vein guttering.