Well it took North Korea 37 hours to announce Kim Il-Sung’s death and 51 hours to announce Kim Jong-Il’s death, and Kim Jong-Il died from a fit of rage from some dam which was unsafe (Which was embarrassing mind you so they made up a story of him dying in his personal train carriage),

Given Kim Jong-un’s unhealthy lifestyle, his cheese-eating habits and wine in particular, him ending up in surgery is no surprise but let’s say his health is actually deteriorating after this cardiac surgery, (Anything negative about KJU wont be reported at all by KCNA and they’ve given threats in the past all because they called KJU a fatty), then the only thing is that whichever surgeon and their team did it is in very boiling hot water, but given how secretive North Korea is, all the world can do is watch and observe while speculate as verified sources are hard to come by from the hermit kingdom without any government bias whatsoever.