The Cardiac Examination

Cardiac Examination Overview

  • Central theme: Understanding and performing a thorough cardiac examination, including the anatomical and physiological principles involved, examination techniques, and the interpretation of findings.

Introduction to Cardiac Examination

  • The heart's contraction creates a wringing or twisting movement that is palpable (apex beat) and sometimes visible on the chest (praecordium).

  • Blood flow through the heart and its valves generates distinctive sounds, producing pulsations in arteries and movement in veins.

Anatomy Relevant to Examination

  1. Surface Anatomy

    • Significant focus on the cardiac valves and positions of palpable arteries.

    • Understanding surface anatomy during cardiovascular examination is essential.

  2. Heart Anatomy

    • Atrioventricular (AV) valves: Mitral and Tricuspid separate atria from ventricles.

    • Semilunar valves separate ventricles from great vessels.

    • Fibrous skeleton supports the heart valves.

  3. Myocardial Circulation

    • Supplied by three coronary arteries, depicted in figures:

      • Left Coronary Artery (LCA) arises from left coronary sinus, splits into:

      • Left Anterior Descending (LAD) artery supplying the anterior heart wall.

      • Circumflex (Cx) artery supplying the posterior heart.

      • Right Coronary Artery (RCA) from right coronary sinus, supplies inferior and right ventricular walls.

  4. Jugular Venous Pressure Assessment

    • Assessing right heart filling through jugular veins; internal jugular vein is deep in the sternocleidomastoid, while external is lateral.

    • Pulsations reflect movements of blood column leading to atrium, measured relative to the sternal angle.

Physical Examination Techniques

  1. Positioning and Inspection

    • Patient positioning at 45° is crucial for examining the jugular venous pressure (JVP).

    • Observe the patient's general appearance—signs of distress, cachexia (weight loss/muscle wasting, can arise from severe heart failure or malignancy).

  2. Hand Examination

    • Nails checked for:

      • Clubbing: Increase in tissue around the distal parts of fingers/toes. Causes vary; one theory links it to platelet-derived growth factor release from megakaryocytes.

      • Splinter Hemorrhages: Linear streaks in nail beds, often signifying endocarditis or trauma.

      • Osler's Nodes: Tender nodules in fingers/toes indicative of infective endocarditis.

      • Xanthomas: Lipid deposits indicating hyperlipidemia (type II and type III).

  3. Pulse Characterization

    • Rate, rhythm, and volume checked via radial pulse:

      • Bradycardia: Heart rate < 60 bpm.

      • Tachycardia: Heart rate > 100 bpm.

    • Irregular rhythms could indicate atrial fibrillation or other conduction issues.

      • Radiofemoral Delay: Assessed in patients, significant if radi of femoral pulse is notably delayed compared to radial pulse, indicating possible aortic coarctation.

  4. Blood Pressure Measurement

    • Importance of proper cuff size, standard arm placement for accurate measurement.

    • Korotkoff Sounds: Used to define systolic and diastolic pressures; respective phases during deflation.

    • Normal blood pressure defined as systolic < 130 mmHg and diastolic < 85 mmHg.

    • Assessment for postural changes in blood pressure when moving from sitting to standing positions.

  5. Cardiovascular Signs in the Neck

    • Inspection for carotid and jugular pulses gives insight into aortic pulse changes, correlating with heart conditions, including pathologies such as right heart failure.

    • Jugular Venous Pressure (JVP): Assessed via visible pulsations, indicating right atrial pressures with visually measurable heights above the sternal angle.

      • Positive hepatojugular reflux test supports findings of right heart failure.

Systems Approach to Examination

  1. Palpation

    • Apex beat location: 5th left intercostal space medial to the midclavicular line.

    • Other vital strategies include palpating for thrills indicative of significant heart issues (e.g., murmurs).

    • Detailed examination of the praecordium to identify abnormal vibrations and impulses associated with cardiac pathology.

  2. Auscultation

    • Use of the stethoscope to assess heart sounds:

      • S1 (First heart sound): Represents mitral and tricuspid closure at the onset of ventricular systole.

      • S2 (Second heart sound): Indicates closure of aortic and pulmonary valves at the end of systole. Splitting can indicate various heart conditions.

    • Specific findings (e.g., increased loudness and pitch in pathological murmurs) signal particular types of heart disease.

Interpretation of Findings

  • Clues from the examination provide significant diagnostic insights into underlying cardiac diseases:

    • Murmur nature (systolic vs. diastolic) and characteristics (timing, sound intensity, pitch).

    • Dynamic maneuvers impacting murmur behavior provide additional diagnostic utility, important for conditions like hypertrophic cardiomyopathy or mitral valve prolapse.

Summary

  • The cardiovascular examination involves systematic approaches to gathering information on cardiac function through inspection, palpation, auscultation, and interpretation of findings.

  • Knowledge of anatomical relationships and the physiological processes of the heart informs effective examination and diagnosis of cardiac diseases. Practice and familiarity with techniques enhance the reliability of clinical assessments of cardiovascular health.