Auscultation, Palpation, and Percussion of the Heart

Palpation of the Heart

• Point of Maximal Impulse (PMI)
  • Palpation involves placing your hand over the apex of the heart.
  • The PMI is often felt just slightly lateral to the nipple in most patients.
  • Finding the PMI may be challenging in certain conditions, especially:
  • Chronic Obstructive Pulmonary Disease (COPD):
    • Hyperinflation in COPD increases the distance from your hand to the left ventricular impulse, making it harder to detect the PMI.
• PMI Displacement:
  • If the PMI is significantly displaced to the anterior axillary line or mid-axillary line, this may indicate:
  • Left Ventricular Hypertrophy (LVH)
  • Left Ventricular Dilation

Percussion of the Heart

• Historical Context:
  • Percussion was historically used to evaluate the heart's borders.
  • Currently, percussion is less common and considered less useful in modern practice.
• Situations Where Percussion is Useful:
  • In patients with emphysema:
  • The heart and pericardium are connected to the diaphragm, which is pushed down in emphysema due to increased thoracic dead space.
  • This effect can result in the pericardium being displaced downward towards the midline.
  • Percussion Findings:
  • Rather than dullness over the left ventricle, percussion may reveal resonance in emphysema-affected patients.
  • The PMI in severe COPD may shift to the subxiphoid area instead of the anterior axillary line.

Summary of Key Insights

• Palpation
  • PMIs provide valuable information about heart size and conditions, with challenges in patients with certain respiratory conditions.
• Percussion
  • While less frequently employed, percussion can aid in assessing the heart's position in specific pulmonary conditions, highlighting changes in diaphragm and pericardium relationships.