what are s1 s2 s3 and s4 heart sounds
Heart sounds In healthy adults, there are two normal heart sounds often described as a lub and a dub (or dup), that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves and semilunar valves, respectively. In addition to these normal sounds, a variety of other sounds may be present including heart murmurs, adventitious sounds, and gallop rhythms S3 and S4.
Samsung Gear S Samsung Gear S is a smartwatch designed and marketed by Samsung Electronics. It was announced on August 28, 2014, as the successor to the Samsung Gear 2 and was released on November 7, 2014.[2]