First and Second Heart Sounds - Normal and Unsplit | #32

This is a normal first and second heart sound at 60 beats per minute. You are auscultating at the Mitral valve area (Apex). The first heart sound has slightly greater intensity than the second heart sound.
  • The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets.
  • The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
  • The second heart sound is unsplit when the subject is holding his or her breath at peak expiration.

Auscultation Audio

auscultation sound from lesson
waveform

Patient Sounds

patient heart or lung sound
First and Second Heart Sounds - Normal and Unsplit

Half Speed Patient Sounds

patient heart or lung sound
First and Second Heart Sounds - Normal and Unsplit

Technique

Patient position
The patient's position should be supine.

Auscultation Tips

Sound Wave



Observe Cardiac Animation

The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets. The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
First and Second Heart Sounds - Normal and Unsplit | #32

Electrocardiogram (EKG/ECG) ECG Interpretation
Heart Sounds Heart Sounds
Lung Sounds Lung Sounds
Blood Pressure Blood Pressure
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Ultrasound image Ultrasound
Electrocardiogram (EKG/ECG) EKG Rhythms
Pulmonary Problem-Solving Respiratory Care
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Adv. ECG Monitor
Pulmonary Hypertension course image Fundamentals
Lung Sounds Key Lung Sounds
Pediatric referral image Pediatric Referral
Carotid Artery Bruit Carotid Bruit
Pulmonary Hypertension course image Pulmon. Hypertension
Abdominal Sounds Abdominal Sounds
Auscultation Training by Repetition Repetition Drill
auscultation guide torso

Reference Guide
multimedia lessons Free Resources
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