9.3: Cardiovascular Assessment
A thorough assessment of the heart provides valuable information about the function of a patient’s cardiovascular system. Understanding how to properly assess the cardiovascular system and identifying both normal and abnormal assessment findings will allow the nurse to provide quality, safe care to the patient.
Before assessing a patient’s cardiovascular system, it is important to understand the various functions of the cardiovascular system. In addition to the information provided in the “Review of Cardiac Basics” section, the following images provide an overview of the cardiovascular system. Figure \(\PageIndex{1}\) [1] provides an overview of the structure of the heart. Note the main cardiac structures are the atria, ventricles, and heart valves. Figure \(\PageIndex{2}\) [2] demonstrates blood flow through the heart. Notice the flow of deoxygenated blood from the posterior and superior vena cava into the right atria and ventricle during diastole (indicated by blue coloring of these structures). The right ventricle then pumps deoxygenated blood to the lungs via the pulmonary artery during systole. At the same time, oxygenated blood from the lungs returns to the left atria and ventricle via the pulmonary veins during diastole (indicated by red coloring of these structures) and then is pumped out to the body via the aorta during systole. Figure \(\PageIndex{3}\) [3] demonstrates the conduction system of the heart. This image depicts the conduction pathway through the heart as the tissue responds to electrical stimulation. Figure \(\PageIndex{4}\) [4] illustrates the arteries of the circulatory system, and Figure \(\PageIndex{5}\) [5] depicts the veins of the circulatory system. The purpose of these figures is to facilitate understanding of the electrical and mechanical function of the heart within the cardiovascular system.
Assessing the cardiovascular system includes performing several subjective and objective assessments. At times, assessment findings are modified according to life span considerations.
Subjective Assessment
The subjective assessment of the cardiovascular and peripheral vascular system is vital for uncovering signs of potential dysfunction. To complete the subjective cardiovascular assessment, the nurse begins with a focused interview. The focused interview explores past medical and family history, medications, cardiac risk factors, and reported symptoms. Symptoms related to the cardiovascular system include chest pain, peripheral edema, unexplained sudden weight gain, shortness of breath (dyspnea), irregular pulse rate or rhythm, dizziness, or poor peripheral circulation. Any new or worsening symptoms should be documented and reported to the health care provider.
Table \(\PageIndex{1}\) outlines questions used to assess symptoms related to the cardiovascular and peripheral vascular systems. Table \(\PageIndex{2}\) outlines questions used to assess medical history, medications, and risk factors related to the cardiovascular system. Information obtained from the interview process is used to tailor future patient education by the nurse. [6] , [7] , [8]
| Symptom | Question |
Follow-Up Safety Note: If findings indicate current severe symptoms suggestive of myocardial infarction or another critical condition, suspend the remaining cardiovascular assessment and obtain immediate assistance according to agency policy or call 911. |
|---|---|---|
| Chest Pain | Have you had any pain or pressure in your chest, neck, or arm? |
Review how to assess a patient’s chief complaint using the PQRSTU method in the “
Health History
” chapter.
|
|
Shortness of Breath
( Dyspnea ) |
Do you ever feel short of breath with activity?
Do you ever feel short of breath while sleeping? Do you feel short of breath when lying flat? |
What level of activity elicits shortness of breath?
How long does it take you to recover?
Have you ever woken up from sleeping feeling suddenly short of breath
How many pillows do you need to sleep, or do you sleep in a chair ( orthopnea )? Has this recently changed? |
| Edema |
Have you noticed swelling of your feet or ankles?
Have you noticed your rings, shoes, or clothing feel tight at the end of the day? Have you noticed any unexplained, sudden weight gain? Have you noticed any new abdominal fullness? |
Has this feeling of swelling or restriction gotten worse?
Is there anything that makes the swelling better (e.g., sitting with your feet elevated)? How much weight have you gained? Over what time period have you gained this weight? |
| Palpitations |
Have you ever noticed your heart feels as if it is racing or “fluttering” in your chest?
Have you ever felt as if your heart “skips” a beat? |
Are you currently experiencing palpitations?
When did palpitations start? Have you previously been treated for palpitations? If so, what treatment did you receive? |
|
Dizziness
( Syncope ) |
Do you ever feel light-headed?
Do you ever feel dizzy? Have you ever fainted? |
Can you describe what happened?
Did you have any warning signs? Did this occur with position change? |
| Poor Peripheral Circulation |
Do your hands or feet ever feel cold or look pale or bluish?
Do you have pain in your feet or lower legs when exercising? |
What, if anything, brings on these symptoms?
How much activity is needed to cause this pain? Is there anything, such as rest, that makes the pain better? |
| Calf Pain | Do you currently have any constant pain in your lower legs? | Can you point to the area of pain with one finger? |
Objective Assessment
The physical examination of the cardiovascular system involves the interpretation of vital signs, inspection, palpation, and auscultation of heart sounds as the nurse evaluates for sufficient perfusion and cardiac output.
For more information about assessing a patient’s oxygenation status as it relates to their cardiac output, visit the “ Oxygenation ” chapter in Open RN Nursing Fundamentals .
Equipment needed for a cardiovascular assessment includes a stethoscope, penlight, centimeter ruler or tape measure, and sphygmomanometer . [10]
Evaluate Vital Signs and Level of Consciousness
Interpret the blood pressure and pulse readings to verify the patient is stable before proceeding with the physical exam. Assess the level of consciousness; the patient should be alert and cooperative.
As a general rule of thumb, findings of systolic blood pressure in adults less than 100,or a pulse rate less than 60 or greater than 100,require immediate follow-up. For more information on obtaining and interpreting vital signs, see the “ General Survey ” chapter. Keep in mind that excessive drowsiness, restlessness, or irritability can be symptoms of hypoxia.
Inspection
- Skin color to assess perfusion. Inspect the face, lips, and fingertips for cyanosis or pallor. Cyanosis is a bluish discoloration of the skin, lips, and nail beds and indicates decreased perfusion and oxygenation. Pallor is the loss of color, or paleness of the skin or mucous membranes, as a result of reduced blood flow, oxygenation, or decreased number of red blood cells. Patients with light skin tones should be pink in color. For those with darker skin tones, assess for pallor on the palms, conjunctiva, or inner aspect of the lower lip.
- Jugular Vein Distension (JVD) . Inspect the neck for JVD that occurs when the increased pressure of the superior vena cava causes the jugular vein to bulge, making it most visible on the right side of a person’s neck. JVD should not be present in the upright position or when the head of bed is at 30-45 degrees.
- Precordium for abnormalities. Inspect the chest area over the heart (also called precordium ) for deformities, scars, or any abnormal pulsations the underlying cardiac chambers and great vessels may produce.
-
Extremities:
- Upper Extremities: Inspect the fingers, arms, and hands bilaterally noting Color, Warmth, Movement, Sensation (CWMS). Alterations or bilateral inconsistency in CWMS may indicate underlying conditions or injury. Assess capillary refill by compressing the nail bed until it blanches and record the time taken for the color to return to the nail bed. Normal capillary refill is less than 3 seconds. [11]
-
Lower Extremities:
Inspect the toes, feet, and legs bilaterally, noting CWMS, capillary refill, and the presence of peripheral edema, superficial distended veins, and hair distribution. Document the location and size of any skin ulcers.
- Edema: Note any presence of edema. Peripheral edema is swelling that can be caused by infection, thrombosis, or venous insufficiency due to an accumulation of fluid in the tissues. (See Figure \(\PageIndex{6}\) [12] for an image of pedal edema.) [13]
- Deep Vein Thrombosis (DVT) : A deep vein thrombosis (DVT) is a blood clot that forms in a vein deep in the body. DVT requires emergency notification of the health care provider and immediate follow-up because of the risk of developing a life-threatening pulmonary embolism . [14] Inspect the lower extremities bilaterally. Assess for size, color, temperature, and for presence of pain in the calves. Unilateral warmth, redness, tenderness, swelling in the calf, or sudden onset of intense, sharp muscle pain that increases with dorsiflexion of the foot is an indication of a deep vein thrombosis (DVT). [15] See Figure \(\PageIndex{7}\) [16] for an image of a DVT in the patient’s right leg, indicated by unilateral redness and edema.
Auscultation
Heart Sounds
Auscultation is routinely performed over five specific areas of the heart to listen for corresponding valvular sounds. These auscultation sites are often referred to by the mnemonic “APE To Man,” referring to Aortic, Pulmonic, Erb’s point, Tricuspid, and Mitral areas (see Figure \(\PageIndex{8}\) [17] for an illustration of cardiac auscultation areas). The aortic area is the second intercostal space to the right of the sternum. The pulmonary area is the second intercostal space to the left of the sternum. Erb’s point is directly below the aortic area and located at the third intercostal space to the left of the sternum. The tricuspid (or parasternal) area is at the fourth intercostal space to the left of the sternum. The mitral (also called apical or left ventricular area) is the fifth intercostal space at the midclavicular line.
Auscultation usually begins at the aortic area (upper right sternal edge). Use the diaphragm of the stethoscope to carefully identify the S1 and S2 sounds. They will make a “lub-dub” sound. Note that when listening over the area of the aortic and pulmonic valves, the “dub” (S2) will sound louder than the “lub” (S2). Move the stethoscope sequentially to the pulmonic area (upper left sternal edge), Erb’s point (left third intercostal space at the sternal border), and tricuspid area (fourth intercostal space. When assessing the mitral area for female patients, it is often helpful to ask them to lift up their breast tissue so the stethoscope can be placed directly on the chest wall. Repeat this process with the bell of the stethoscope. The apical pulse should be counted over a 60-second period. For an adult, the heart rate should be between 60 and 100 with a regular rhythm to be considered within normal range. The apical pulse is an important assessment to obtain before the administration of many cardiac medications.
The first heart sound (S1) identifies the onset of systole, when the atrioventricular (AV) valves (mitral and tricuspid) close and the ventricles contract and eject the blood out of the heart. The second heart sound (S2) identifies the end of systole and the onset of diastole when the semilunar valves close, the AV valves open, and the ventricles fill with blood. When auscultating, it is important to identify the S1 (“lub”) and S2 (“dub”) sounds, evaluate the rate and rhythm of the heart, and listen for any extra heart sounds.
Listen to a normal S1/S2 sound. It may be helpful to use earbuds or a headphone:
Query \(\PageIndex{1}\)
Auscultating Heart Sounds
- To effectively auscultate heart sounds, patient repositioning may be required. Ask the patient to lean forward if able, or position them to lie on their left side.
- It is common to hear lung sounds when auscultating the heart sounds. It may be helpful to ask the patient to briefly hold their breath if lung sounds impede adequate heart auscultation. Limit the holding of breath to 10 seconds or as tolerated by the patient.
- Environmental noise can cause difficulty in auscultating heart sounds. Removing environmental noise by turning down the television volume or shutting the door may be required for an accurate assessment.
- Patients may try to talk to you as you are assessing their heart sounds. It is often helpful to explain the procedure such as, “I am going to take a few minutes to listen carefully to the sounds of blood flow going through your heart. Please try not to speak while I am listening, so I can hear the sounds better.”
Extra Heart Sounds
Extra heart sounds include clicks, murmurs, S3 and S4 sounds, and pleural friction rubs. These extra sounds can be difficult for a novice to distinguish, so if you notice any new or different sounds, consult an advanced practitioner or notify the provider. A midsystolic click , associated with mitral valve prolapse, may be heard with the diaphragm at the apex or left lower sternal border.
A click may be followed by a murmur. A murmur is a blowing or whooshing sound that signifies turbulent blood flow often caused by a valvular defect. New murmurs not previously recorded should be immediately communicated to the health care provider. In the aortic area, listen for possible murmurs of aortic stenosis and aortic regurgitation with the diaphragm of the stethoscope. In the pulmonic area, listen for potential murmurs of pulmonic stenosis and pulmonary and aortic regurgitation. In the tricuspid area, at the fourth and fifth intercostal spaces along the left sternal border, listen for the potential murmurs of tricuspid regurgitation, tricuspid stenosis, or ventricular septal defect.
Listen to a heart murmur caused by mitral valve regurgitation:
Query \(\PageIndex{2}\)
S3 and S4 sounds, if present, are often heard best by asking the patient to lie on their left side and listening over the apex with the bell of the stethoscope. An S3 sound, also called a ventricular gallop , occurs with fluid overload or heart failure when the ventricles are filling. It occurs after the S2 and sounds like “lub-dub-dah,” or a sound similar to a horse galloping. The S4 sound, also called atrial gallop , occurs immediately before the S1 and sounds like “ta-lub-dub.” An S4 sound can occur with decreased ventricular compliance or coronary artery disease. [18]
Listen to a S3 ventricular gallop:
Query \(\PageIndex{3}\)
Listen to a S4 atrial gallop:
Query \(\PageIndex{4}\)
A pleural friction rub is caused by inflammation of the pericardium and sounds like sandpaper being rubbed together. It is best heard at the apex or left lower sternal border with the diaphragm as the patient sits up, leans forward, and holds their breath.
Carotid Sounds
The carotid artery may be auscultated for bruits . Bruits are a swishing sound due to turbulence in the blood vessel and may be heard due to atherosclerotic changes.
Palpation
Palpation is used to evaluate peripheral pulses, capillary refill, and for the presence of edema. When palpating these areas, also pay attention to the temperature and moisture of the skin.
Pulses
Compare the rate, rhythm, and quality of arterial pulses bilaterally, including the carotid, radial, brachial, posterior tibialis, and dorsalis pedis pulses. Review additional information about obtaining pulses in the “ General Survey ” chapter. Bilateral comparison for all pulses (except the carotid) is important for determining subtle variations in pulse strength. Carotid pulses should be palpated on one side at a time to avoid decreasing perfusion of the brain. The posterior tibial artery is located just behind the medial malleolus. It can be palpated by scooping the patient’s heel in your hand and wrapping your fingers around so that the tips come to rest on the appropriate area just below the medial malleolus. The dorsalis pedis artery is located just lateral to the extensor tendon of the big toe and can be identified by asking the patient to flex their toe while you provide resistance to this movement. Gently place the tips of your second, third, and fourth fingers adjacent to the tendon, and try to feel the pulse.
The quality of the pulse is graded on a scale of 0 to 3, with 0 being absent pulses, 1 being decreased pulses, 2 is within normal range, and 3 being increased (also referred to as “bounding”). If unable to palpate a pulse, additional assessment is needed. First, determine if this is a new or chronic finding. Second, if available, use a doppler ultrasound to determine the presence or absence of the pulse. Many agencies use doppler ultrasound to document if a nonpalpable pulse is present. If the pulse is not found, this could be a sign of an emergent condition requiring immediate follow-up and provider notification. See Figures \(\PageIndex{9}\) [19] and \(\PageIndex{10}\) [20] for images of assessing pedal pulses.
Capillary Refill
The capillary refill test is performed on the nail beds to monitor perfusion , the amount of blood flow to tissue. Pressure is applied to a fingernail or toenail until it pales, indicating that the blood has been forced from the tissue under the nail. This paleness is called blanching . Once the tissue has blanched, pressure is removed. Capillary refill time is defined as the time it takes for the color to return after pressure is removed. If there is sufficient blood flow to the area, a pink color should return within 2 to 3 seconds after the pressure is removed. [21]
Edema
Edema occurs when one can visualize visible swelling caused by a buildup of fluid within the tissues. If edema is present on inspection, palpate the area to determine if the edema is pitting or nonpitting. Press on the skin to assess for indentation, ideally over a bony structure, such as the tibia. If no indentation occurs, it is referred to as nonpitting edema. If indentation occurs, it is referred to as pitting edema . See Figure \(\PageIndex{11}\) [22] for images demonstrating pitting edema.
Note the depth of the indention and how long it takes for the skin to rebound back to its original position. The indentation and time required to rebound to the original position are graded on a scale from 1 to 4. Edema rated at 1+ indicates a barely detectable depression with immediate rebound, and 4+ indicates a deep depression with a time lapse of over 20 seconds required to rebound. See Figure \(\PageIndex{12}\) [23] for an illustration of grading edema. Additionally, it is helpful to note edema may be difficult to observe in larger patients. It is also important to monitor for sudden changes in weight, which is considered a probable sign of fluid volume overload.
Heaves or Thrills
You may observe advanced practice nurses and other health care providers palpating the anterior chest wall to detect any abnormal pulsations the underlying cardiac chambers and great vessels may produce. Precordial movements should be evaluated at the apex (mitral area). It is best to examine the precordium with the patient supine because if the patient is turned on the left side, the apical region of the heart is displaced against the lateral chest wall, distorting the chest movements. [24] A heave or lift is a palpable lifting sensation under the sternum and anterior chest wall to the left of the sternum that suggests severe right ventricular hypertrophy. A thrill is a vibration felt on the skin of the precordium or over an area of turbulence, such as an arteriovenous fistula or graft.
Life Span Considerations
The cardiovascular assessment and expected findings should be modified according to common variations across the life span.
Infants and Children
A murmur may be heard in a newborn in the first few days of life until the ductus arteriosus closes.
When assessing the cardiovascular system in children, it is important to assess the apical pulse. Parameters for expected findings vary according to age group. After a child reaches adolescence, a radial pulse may be assessed. Table \(\PageIndex{3}\) outlines the expected apical pulse rate by age.
| Age Group | Heart Rate |
|---|---|
| Preterm | 120-180 |
| Newborn (0 to 1 month) | 100-160 |
| Infant (1 to 12 months) | 80-140 |
| Toddler (1 to 3 years) | 80-130 |
| Preschool (3 to 5 years) | 80-110 |
| School Age (6 to 12 years) | 70-100 |
| Adolescents (13 to 18 years) | 60-90 |
Listen to pediatric heart tones:
Query \(\PageIndex{5}\)
Older Adults
In adults over age 65, irregular heart rhythms and extra sounds are more likely. An “irregularly irregular” rhythm suggests atrial fibrillation , and further investigation is required if this is a new finding. See the hyperlink in the box below for more information about atrial fibrillation.
Listen to atrial fibrillation:
Query \(\PageIndex{6}\)
For more information on atrial fibrillation, visit the following web page: CDC Atrial Fibrillation .
Expected Versus Unexpected Findings
After completing a cardiovascular assessment, it is important for the nurse to use critical thinking to determine if any findings require follow-up. Depending on the urgency of the findings, follow-up can range from calling the health care provider to calling the rapid response team. Table \(\PageIndex{4}\) compares examples of expected findings, meaning those considered within normal limits, to unexpected findings, which require follow-up. Critical conditions are those that should be reported immediately and may require notification of a rapid response team.
| Assessment | Expected Findings | Unexpected Findings (Document and notify the provider if this is a new finding*) |
|---|---|---|
| Inspection | Apical impulse may or may not be visible |
Scars not previously documented that could indicate prior cardiac surgeries
Heave or lift observed in the precordium Chest anatomy malformations |
| Palpation | Apical pulse felt over midclavicular fifth intercostal space |
Apical pulse felt to the left of the midclavicular fifth intercostal space
Additional movements over precordium such as a heave, lift, or thrill |
| Auscultation | S1 and S2 heart sounds in a regular rhythm |
New irregular heart rhythm
Extra heart sounds such as a murmur, S3, or S4 |
| *CRITICAL CONDITIONS to report immediately |
Symptomatic tachycardia at rest (HR>100 bpm)
Symptomatic bradycardia (HR<60 bpm) New systolic blood pressure (<100 mmHg) Orthostatic blood pressure changes (see “Blood Pressure” chapter for more information) New irregular heart rhythm New extra heart sounds such as a murmur, S3, or S4 New abnormal cardiac rhythm changes Reported chest pain, calf pain, or worsening shortness of breath |
See Table \(\PageIndex{5}\) for a comparison of expected versus unexpected findings when assessing the peripheral vascular system.
| Assessment | Expected Findings | Unexpected Findings (Document or notify provider if new finding*) |
|---|---|---|
| Inspection |
Skin color uniform and appropriate for race bilaterally
Equal hair distribution on upper and lower extremities Absence of jugular vein distention (JVD) Absence of edema Sensation and movement of fingers and toes intact |
Cyanosis or pallor, indicating decreased perfusion
Decreased or unequal hair distribution Presence of jugular vein distention (JVD) in an upright position or when head of bed is 30-45 degrees New or worsening edema Rapid and unexplained weight gain Impaired movement or sensation of fingers and toes |
| Palpation |
Skin warm and dry
Pulses present and equal bilaterally Absence of edema Capillary refill less than 2 seconds |
Skin cool, excessively warm, or diaphoretic
Absent, weak/thready, or bounding pulses New irregular pulse New or worsening edema Capillary refill greater than 2 seconds Unilateral warmth, redness, tenderness, or edema, indicating possible deep vein thrombosis (DVT) |
| Auscultation | Carotid pulse | Carotid bruit |
| *CRITICAL CONDITIONS to report immediately |
Cyanosis
Absent pulse (and not heard using Doppler device) Capillary refill time greater than 3 seconds Unilateral redness, warmth, and edema, indicating a possible deep vein thrombosis (DVT) |
Query \(\PageIndex{7}\)
“ Sternum_composition.png ” by Anatomography is licensed under CC BY-SA 2.1 Japan
Query \(\PageIndex{8}\)
“ Sternum_composition.png ” by Anatomography is licensed under CC BY-SA 2.1 Japan
- “Diagram of the human heart” by Wapcaplet is licensed under CC BY-SA 3.0 ↵
- “Diagram of the human heart” by Wapcaplet is licensed under CC BY-SA 3.0 ↵
- “ 2018 Conduction System of Heart.jpg ” by OpenStax is licensed under CC-BY-3.0 . ↵
- “ Arterial System en.svg ” by LadyofHats , Mariana Ruiz Villarreal is in the Public Domain ↵
- “ Venous system en.svg ” by Lady of Hats Mariana Ruiz Vilarreal is in the Public Domain ↵
- This work is a derivative of Clinical Procedures for Safer Patient Care by British Columbia Institute of Technology licensed under CC BY 4.0 ↵
- Felner, J. M. (1990). An overview of the cardiovascular system. In Walker, H. K., Hall, W. D., & Hurst, J. W. (Eds.), Clinical methods: The history, physical, and laboratory examinations (3rd ed., Chapter 7). Butterworths. www.ncbi.nlm.nih.gov/books/NBK393/↵
- Scott, C. & MacInnes, J. D. (2013, September 27). Cardiac patient assessment: putting the patient first. British Journal of Nursing, 15 (9). doi.org/10.12968/bjon.2006.15.9.21091↵
- Scott, C. & MacInnes, J. D. (2013, September 27). Cardiac patient assessment: putting the patient first. British Journal of Nursing, 15 (9). doi.org/10.12968/bjon.2006.15.9.21091↵
- Felner, J. M. (1990). An overview of the cardiovascular system. In Walker, H. K., Hall, W. D., & Hurst, J. W. (Eds.), Clinical methods: The history, physical, and laboratory examinations (3rd ed., Chapter 7). Butterworths. www.ncbi.nlm.nih.gov/books/NBK393/↵
- This work is a derivative of Clinical Procedures for Safer Patient Care by British Columbia Institute of Technology licensed under CC BY 4.0 ↵
- “ Swollen feet at Harefield Hospital edema.jpg” by Ryaninuk is licensed under CC BY-SA 4.0 ↵
- Simon, E. C. (2014). Leg edema assessment and management. MEDSURG Nursing, 23(1), 44-53. ↵
- This work is a derivative of Clinical Procedures for Safer Patient Care by British Columbia Institute of Technology licensed under CC BY 4.0 ↵
- This work is a derivative of Clinical Procedures for Safer Patient Care by British Columbia Institute of Technology licensed under CC BY 4.0 ↵
- “ Deep vein thrombosis of the right leg.jpg ” by James Heilman, MD is licensed under CC BY-SA 3.0 ↵
- “Cardiac Auscultation Areas” by Meredith Pomietlo for Chippewa Valley Technical College is licensed under CC BY 4.0 ↵
- Felner, J. M. (1990). An overview of the cardiovascular system. In Walker, H. K., Hall, W. D., & Hurst, J. W. (Eds.), Clinical methods: The history, physical, and laboratory examinations (3rd ed., Chapter 7). Butterworths. www.ncbi.nlm.nih.gov/books/NBK393/↵
- “DSC_2277.jpg” by British Columbia Institute of Technology is licensed under CC BY 4.0 . Access for free at https://opentextbc.ca/clinicalskills/chapter/2-5-focussed-respiratory-assessment/ ↵
- “DSC_2314.jpg” by British Columbia Institute of Technology is licensed under CC BY 4.0. Access for free at https://opentextbc.ca/clinicalskills/chapter/2-5-focussed-respiratory-assessment/ ↵
- A.D.A.M. Medical Encyclopedia [Internet]. Atlanta (GA): A.D.A.M., Inc.; c1997-2020. Capillary nail refill test; [updated 2020, Aug 9] https://medlineplus.gov/ency/article/003247.htm ↵
- “ Combinpedal.jpg ” by James Heilman, MD is licensed under CC BY-SA 3.0 ↵
- “Grading of Edema” by Meredith Pomietlo for Chippewa Valley Technical College is licensed under CC BY 4.0 ↵
- Felner, J. M. (1990). An overview of the cardiovascular system. In Walker, H. K., Hall, W. D., & Hurst, J. W. (Eds.), Clinical methods: The history, physical, and laboratory examinations (3rd ed., Chapter 7). Butterworths. www.ncbi.nlm.nih.gov/books/NBK393/↵