Esophageal varices....nope never saw the Paramedic curriculum.
What "I" did or didn't do is sorta irrelevant unles this is about personalities. I never read the material in the paramedic book because I went from EMT-A and crash rescueman to RN without doing paramedic as I originally intended. I got my ACLS afterward.
In 22 plus years I've had to contend with four real life cases, no, patients, with esophageal varices, and within two years #2 was dead (#3 and #1 died within 24 hrs of presenting , and #4 didn't make it off the campus).
The local trauma center/teaching hospital put it this way...if those cases had occurred in their ER, the likelihood of survival over any meaningful length of time was still next to nil, because there is simply no way to stop such massive sudden blood loss. Just as well push a 12 ga to their chest and pull the trigger.
In the real world, in the field, the time to take to do a ddx on a rupturing esoph varix versus other worsening sources of lots of blood from down the throat is just time dithering; you HAVE no measure to benefit the pt and youjr diagnostics for that arena are inferior. Big bore bilateral lines, airway, work on your differential while getting to the echelon of care your patient will require no matter what the diff is. Be sure to pass on what measures you have taken. You will probably go down swinging, but those are your patient's only chances.
Cut to the chase.