Cardiovascular Assessment and Heart Anatomy

Anatomy of the Heart

  • Pericardium

    • Protects the heart

    • Known as the pericardial sac

  • Myocardium

    • Muscular wall of the heart

  • Endocardium

    • Thin layer of endothelial tissue

    • Lines the inner surfaces of the heart chambers

Structure of the Heart

  • Heart Pump Systems

    • Each side of the heart consists of an atrium and a ventricle

    • Atria: Holds blood

    • Ventricles: Pumps blood out to the body

  • Atrioventricular (AV) Valves

    • Tricuspid Valve (right side)

    • Mitral Valve (left side)

    • Open during filling phase, close during pumping (systolic phase)

  • Heart Sounds

    • S1 (Lub): Caused by closure of the AV valves during systolic phase (louder sound)

    • S2 (Dub): Caused by closure of the semilunar valves (aortic and pulmonic) during diastolic phase

    • S1 is heard as "lub," S2 is heard as "dunk"

  • Semilunar Valves

    • Aortic Valve (left side)

    • Pulmonic Valve (right side)

    • Both have three cusps, shaped like a crescent or half-moon

Cardiac Cycle

  • Oxygenated Blood Flow

    • Blood enters through the superior and inferior vena cava into the right atrium

    • Passes through the tricuspid valve into the right ventricle

    • Right ventricle pumps blood to the lungs via the pulmonary artery

    • In lungs, blood picks up oxygen

  • Deoxygenated Blood Flow

    • Oxygen-rich blood returns to the left atrium via the pulmonary vein

    • Left ventricle pumps blood to the body via the aorta (systemic circulation)

  • Insufficient Detailed Breakdown for Nursing

    • For student nurses, simplify the understanding of sounds and actions

Heart Sounds

  • S1 (Lub)

    • Occurs with AV valves closure

    • Beginning of systolic phase where ventricles contract

  • S2 (Dub)

    • Happens during closure of semilunar valves

    • Ventricles relax

  • S3 (Extra Heart Sound)

    • Occurs right after S2 when blood flows into the ventricles

    • May indicate fluid overload

    • Normal in children, indicative of heart failure (CHF) in adults

  • S4 (Extra Heart Sound)

    • Occurs at the end of diastolic phase when ventricles resist filling

    • Associated with hypertension and history of heart attack

Heart Murmurs

  • Definition: A swooshing sound due to turbulent blood flow

  • Causes:

    • Conditions affecting mitral valve, tricuspid valve, aortic stenosis, and mitral valve prolapse

  • Common Symptoms:

    • Swooshing sound indicates mixing of blood due to incomplete valve closure

Assessment Techniques

  • Stethoscope Components

    • Diaphragm: For normal/regular heart tones

    • Bell: For high-pitched or abnormal sounds

  • Listening Strategy

    • Use the diaphragm for normal sounds S1 and S2

    • Switch to the bell to detect abnormal sounds

Subjective and Objective Data for Cardiac Assessment

  • Subjective Data: To understand patient complaints

    • Chest pain, shortness of breath, orthopnea (breathlessness when lying flat)

    • Evaluate fatigue, cough, nocturia, peripheral edema, previous cardiac history

    • Ask about genetics like family history of heart disease

  • Objective Data: Observations and examinations during assessment

    • Examine jugular vein distension (JVD)

    • Palpate carotid arteries for rhythm and strength

    • Evaluate for pitting edema and auscultate heart beating

Conducting a Carotid Assessment

  • Palpation of Carotid Arteries

    • Assess one side at a time to maintain blood flow to the brain

    • Evaluate strength (normal is +2)

  • Auscultation for Bruit

    • Listen for abnormal swooshing sounds indicative of turbulent flow

    • Important positioning and pressure levels to avoid interference

Clinical Considerations for Population Groups

  • Pediatric Patients

    • Normal to hear S3 due to fast blood flow

    • Watch for signs of heart issues during feedings like fatigue, shortness of breath, or cyanosis

    • Conditions may lead to tachycardia or clubbing of fingers indicative of congenital heart defects

  • Pregnant Women

    • Increased heart rate by 10-15 beats/min, normal blood pressure

  • Older Adults

    • Gradual rise in systolic blood pressure, greater risk for orthostatic hypotension with age

    • Increased prevalence of coronary artery disease, heart failure, and lifestyle factors impacting health

Heart Failure Overview

  • Definition: The heart cannot pump effectively to meet the body's demands

  • Types:

    • Left-sided heart failure: Impacts lungs, leading to shortness of breath

    • Right-sided heart failure: Causes systemic fluid buildup such as edema

  • Symptoms: Include dyspnea, fatigue, and decreased appetite

  • Assessment: Focus on differences between sides, listen for lung sounds such as crackles in left-sided failure

Practical Assessment Skills

  • Five Areas for auscultation:

    1. Aortic Valve: Right of the sternal border, second intercostal space

    2. Pulmonic Valve: Left of the sternal border, second intercostal space

    3. Erb's Point: Third intercostal space left of sternal border

    4. Tricuspid Valve: Fourth intercostal space left of sternal border

    5. Mitral Valve: Fifth intercostal space, midclavicular line, beneath left nipple

  • Listening Duration:

    • Regular rhythm: Listen for 30 seconds, multiply by 2

    • Abnormal rhythms: Listen for a full minute

Contextual Medical Information

  • Genetics and Comorbidities: Understand history of heart issues in family, create personalized patient care plans based on cultural factors and existing diseases like diabetes.

  • Lifestyle Habits: Modifiable factors such as smoking, diet, and exercise play crucial roles in heart health; aim for regular physical activity of at least 20 minutes a day, 5 days a week.