You are incorrect - our patient's acoustic events at the apex include a fourth heart sound, a Angina Pectoris first heart sound and a Angina Pectoris second heart sound.
Your choice: S1 + S2 + opening snap (OS)
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captions settings, opens captions settings dialog
captions off, selected
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End of dialog window.
This is a graphic example of an opening snap.
Note that the opening snap occurs in early diastole an dis high frequency.