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 + widely split S2
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This is a graphic example of an S1 followed by a widely split S2.
Only the aortic component of the second sound is normally heard at the apex and splitting is best heard at the base. Second sounds are high in frequency and rarely split more than eight hundredths of a second.