Cardio

Introduction

  • Brief engagement with students about their phones and personal insights.

  • Overview about the cardiovascular topic and addressing student anxiety regarding performance in exams.

Overview of Heart Function

  • Importance of the heart: "If your heart's not beating, you are dead."

  • Essential to understand blood flow through the heart for comprehension of heart failure symptoms.

Blood Flow through the Heart

  • Deoxygenated Blood Flow:

    • Blood returns from the venous system to the vena cava → enters right atrium → through tricuspid valve into right ventricle → through pulmonic valve into pulmonary artery.

    • Note: The pulmonary artery carries deoxygenated blood to the lungs to become oxygenated.

  • Oxygenated Blood Flow:

    • Blood travels from lungs to left atrium via pulmonary vein → through mitral valve into left ventricle → through aortic valve into aorta.

    • Aorta: Largest vessel in the body, distributing oxygenated blood.

Heart Structure and Function

  • Four Heart Chambers:

    • Must beat synchronously: one chamber pumps while another relaxes.

  • Left Ventricle:

    • Notable for a thicker muscle wall, necessary for sufficient contractile force to pump blood effectively.

    • Described as the heart's primary workhorse, often getting tired first.

Heart Failure Overview

  • Heart Failure Statistics:

    • Leading cause of death; greater than the next seven causes combined.

    • 1 in 5 heart failure patients die within a year due to varying compliance concerning lifestyle changes.

  • Types of Heart Failure:

    • Left-Sided Heart Failure:

      • Most common; leads to congestion in lungs due to backed-up blood flow.

      • Can be acute or chronic. Symptoms include poor cardiac output, decreased perfusion, and pulmonary congestion.

    • Right-Sided Heart Failure:

      • Often due to left-sided failure; can lead to systemic congestion.

      • Symptoms include edema, weight gain, and abdominal tenderness.

    • High Output Heart Failure:

      • Rare, associated with increased metabolic demands (e.g., sepsis, anemia).

Left-Sided Heart Failure

  • Primary symptom: Congestive Heart Failure, leading to fluid back-up into lungs.

  • Symptoms: tachycardia, dyspnea (difficulty breathing), and cough at night due to fluid retention.

Right-Sided Heart Failure

  • Often a consequence of left-sided heart failure; leads to systemic fluid accumulation.

  • Symptoms: peripheral edema, distended neck veins, nausea, fluid retention, and weight gain.

Diagnosis & Assessment

  • Ejection Fraction:

    • Important metric reflecting heart health: less than 40% indicates damage.

  • Assessments:

    • Peripheral vascular and pulmonary assessments are crucial in evaluating heart failure severity.

Compensatory Mechanisms

  • Body's response includes:

    • Increased heart rate.

    • Sympathetic nervous system activation.

    • Hormonal changes (e.g., renin-angiotensin system activation).

Risk Factors and Causes of Heart Failure

  • Non-modifiable: Age, gender, genetics.

  • Modifiable: Smoking, diet, exercise.

  • Common causes include hypertension, myocardial infarctions, and structural heart changes.

Nursing Implications and Interventions

  • Daily Weight Monitoring:

    • Important for detecting fluid retention and management of heart failure.

  • Medication Regimens:

    • Importance of adherence to prescribed medications.

  • Patient Education:

    • Lifestyle changes to improve heart health.

Psychosocial Considerations

  • Psychological impact of heart failure can lead to depression and anxiety, affecting overall quality of life.

Imaging and Diagnostic Tools

  • Echocardiogram: Best noninvasive test for evaluating heart function and structure.

  • EKG Monitoring: Understanding the heart’s electrical system through an EKG for assessing rhythm and frequency of beat.

  • Cardiac Catheterization: Definitive assessment of blockages; associated risks of bleeding and additional myocardial infarction post-procedure.

Conclusion and Open Floor for Questions

  • End of lecture summary and invitation for student queries, emphasizing the importance of understanding and managing cardiovascular health.