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!
rGeat eiodv no 1S dan 'tsi s!lp!ti
hTe wya I rremmebe ti, S1: irltMa mp;&a dctpiuirs cb doobl sego rfom ratai to nelsevicrt hetn ormf veelnisrct to udtosie eth aetrh t-;g-& .S2 wN,o ehnw ouy eavh a Slitp 1S het wya I tkihn tbuao si atth hnwe ouy ehianl yuo evah erxta lbodo mginco iont eht tirhg deis fo het athre so teh rudcitspi laevvs olssce trela adn ausces a sptli S1 upno irosaepintr. peoH htat lheps.
:Q ilSpt 1S ehdra veor etLf atsnelr rdoreb - csiiudrpt ear.a sFtir poocentnm of :S1? A nyhgtain MC( in R)BBB taht cssuea daleedy csuorel fo utirdsicp levva dpcmaroe ot rtmali a-vevl lwil sucea ilpst S1 whit eedylda 1T nda rlyea 1M rheda ta cTiprdsui era.a
Pseael raed hte slat ctesenne of teh .einsuqt o I hkitn hte lipts itmhg eb eaecsbu fo Rbb., sthi uaessc het imaltr dna piitdrcsu evvla ot oecls at iertedffn m.ties
-os hwhci of teh olwgnfilo btes aspxenil eht rtsif cnmoontpe fo eth terha uosdn iplts( S.)1 dohSul be eht tlrima velav eoslurc ebofre het rctdiuisp lv.vae
submitted by โlfsuarez(160)
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$279$49 65% OFFsFtir rahte dsoun 1(S) is eagnetder yb otw thaer lvev:as teh itamlr vavel nad stpidricu al.evv lyraNe olneatumisus nlocigs of thees avlsev olyamnlr reegtensa a neigsl 1S .dunos piSnlittg fo the 1S uosdn is dehar hewn litram dan itcridpus svlaev eclos at lslghiyt frteidenf m,itse whti suyulla het ramilt cnlgiso eerofb pcrduisit
$279$49 65% OFF