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!
eratG eoidv no S1 nad 'tsi !s!litp
ehT ywa I erbmmeer it, :S1 rlMtai pm;&a crstuidpi bc doolb oesg omrf iraat to crnetveils then form leetrncivs ot etosiud the eathr -g&;t- .2S ,Nwo when uyo aveh a ptiSl 1S the ayw I itnkh about si thta hnew yuo lahnei yuo ahev rxeta dloob mgocni onit teh tgihr idse of hte tareh os het pitirsucd vsealv cselos larte nda ueassc a tspil 1S nopu entrrpsiia.o eHop tath lsehp.
:Q iptlS S1 draeh revo eftL stlraen droerb - istircdup .raae tsFri etoopnmcn fo 1S:?A nntiaghy MC( ni RBBB) atht ausecs adedyle rluseoc of ciprdtsui vleva mdeoarcp ot ailmrt ve-vla wlli ausec sptil S1 wtih dlaedey T1 and arlye 1M readh ta rcsiuiTpd aae.r
sleeaP raed het satl eectnnes fo het qis.tu eno I ihknt teh lstpi tmhig eb busecae fo ,.bRb sthi acsues the lamrti and utisdprci lvaev to olcse ta fietrnedf .seimt
so- whhic of teh nwloiglfo etsb axilpesn teh rtfis nptmnceoo fo het arhte nuods pi(tsl 1S.) Slhud o eb het atlmri vealv usreloc erobfe eth prtiicsud ae.vlv
submitted by โlfsuarez(160)
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$279$49rFtsi ahrte duons 1)(S si aertndeeg by otw rtahe lvav:se eht italrm vlaev nad sruipictd ev.val yrlaeN ulsasoituenm osgicln of eehst slvave yloarlnm gtaensere a lgesni S1 .nsduo nttpigliS fo het S1 sound si rahed nweh atimrl adn idpcrtisu aselvv lcoes at lygltshi fdfntreei s,mtei whti ylaulus eht imlrta lisncgo breeof ucpidtrsi
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