This video explains it https://www.youtube.com/watch?v=kvQ2IU3ILRo&list=PL3n8cHP87ijDnqI8_5WQlS4tN37D6P4dH&index=8&t=52s
I think by 'left sternal border' they're referring to the Erb's point - left 3rd ICS on sternal border.
Even I got it wrnong thinking tricuspid area is being described!
rateG devoi on S1 dna ti's !listp!
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o-s hhiwc fo eht ognfwlloi tbes nasepixl teh sirft contpemno fo the arhte dnuos (tilps 1S.) uod Slh be teh mraitl lvvae cusrole eebrof the rucpsdiit .valev
submitted by โlfsuarez(160)
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$279$49stFri ahetr unods ()S1 is deentraeg yb wto rhaet avve:ls eth tliamr veavl adn scdruptii ve.lav lyreaN smasulitunoe scolgin of ethse vsvael moyllarn aeesgretn a gnelsi 1S d.osnu tSiltnigp fo teh 1S dousn si hraed enwh tmirla nda tdsicrpui esvavl elsco at lhgltisy irenetdff mi,est ithw llusyua eht lrmiat cngoils fboere psurcitid
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