Learn about the S1 heart sound, listen to examples, take short lessons and compare to other heart sounds. For all medical professionals.
Our S1 heart sound lessons can be found in this first heart sounds module. In addition, our reference index is designed to provide quick access to first heart sounds, with audio tracks, listening guides and waveforms. Use this link for quick reference to heart and lung sounds.
The S1 heart sound is caused by blood flow turbulence when mitral and tricuspid valves close at the start of systole.
Because S1 heart sounds occur when the mitral and tricuspid valve close, the best heart is locations for the stethoscope chestpiece are at the tricuspid (left lower sternal border) and mitral (cardiac apex) locations.
While we have many breath sound lessons and quick references on this website. Please use the links below.
|Basics of Lung Sounds
The goal of this basic course in lung sounds is to improve auscultation observational skills. We focus on describing important breath sounds and in providing recordings of each. Many students find that waveform tracings aid in learning lung sounds; we have included dynamic (moving cursor) waveforms with each lesson. The anatomy pages use illustrations to reveal an example of each lung sound (anatomy not yet available on smartphones).
|1||Vesicular - Normal|
|2||Crackles - Fine (Rales)|
|3||Crackles - Coarse (Rales)|
|5||Rhonchi - Low Pitched Wheezes|
|Intermediate Lung Sounds
The goal of this intermediate course is to expand your observational skills when auscultating breath sounds. The course lessons include voiced sounds: bronchophony, egophony and whispered pectoriloquy. We also provide auscultation lessons on several types of wheezes, crackles and stridor. Each of these lung sound lessons includes audio, text and dynamic waveform. The anatomy pages use illustrations to reveal an example of each lung sound (anatomy not yet available on smartphones).
|1||Vesicular - Diminished|
|2||Bronchophony - Healthy|
|3||Bronchophony - Abnormal|
|4||Egophony - e|
|5||Egophony - a|
|6||Whispered Pectoriloquy - Healthy|
|7||Whispered Pectoriloquy - Abnormal|
|8||Wheeze - Expiratory|
|9||Wheeze - Monophonic|
|10||Wheeze - Polyphonic|
|11||Crackles - Early Inspiratory (Rales)|
|12||Crackles - Late Inspiratory (Rales)|