There's no doubt that we've got to master the signs and symptoms, and associated interventions, of both respiratory and cardiac emergencies. Every situation we face starts with assessing the ABC"s -- Airway, Breathing, and Circulation -- as these represent true emergencies, where it really can be a matter of life-or-death.
EMTs in NJ have a relatively limited scope of practice when it comes to actually treating medical issues. Other than supplying Oxygen and providing or assisting with a very limited set of medications, we mostly provide comfort care and transport for most medical issues.
Of course, CPR is also a critical skill we can apply... one that we always hope isn't actually needed by any of our patients.
While the heart is responsible for pumping blood through the lungs for oxygenation, and then moving the oxygenated blood itself to the tissues and organs throughout the body, it is itself a muscle that also requires oxygenated blood to effectively pump. So any disruption in how the body is obtaining and utilizing air through the upper and lower airways (including the lungs) can cause issues for the heart as well.
And things roll downhill quickly from there on... Because having to perform CPR means that someone is having a really, really, really bad day....