Chest Pain and ACS Triage

Heart attack as a city losing its power grid

Imagine a city block where a single power substation (the coronary artery) supplies electricity to all the buildings on that block. The wires carrying power are like the coronary artery walls—made of smooth muscle and lined with endothelium. When cholesterol plaque builds up inside the wire (atherosclerosis), it narrows the path, like rust clogging a pipe. When that plaque cracks open (rupture), it triggers an emergency response: the body's repair crew (platelets) rushes in and tries to patch the leak, but instead they pile up and completely block the wire (thrombosis). Now the buildings downstream—the heart muscle cells—lose their electrical power (oxygen) and their backup fuel (glucose). Without power, the buildings' cooling systems fail and heat builds up (anaerobic metabolism and lactic acid). Alarms go off everywhere (pain signals), the city broadcasts a distress signal (ST elevation on ECG), and if power is not restored in the next 20–40 minutes, the buildings start catching fire and burning down (myocardial tissue death (necrosis)). The longer the blockage lasts, the more buildings burn—and burned buildings can never be rebuilt, only replaced with rubble (scar tissue).