You are incorrect - our patient's acoustic events at the time of the first heart sound at the apex include a first heart sound, a second heart sound and a third heart sound (S3).
Your choice: S1 + single S2
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This is a graphic example of an S1 an a single S2.
The second heart sound at the apex is almost always single and in most normal adults no sound follows a single second sound. Again, in this case, there is an additional sound following the single second heart sound.