We review procedures with our medical director. Some are reviewed every 6 months and some yearly. Chest tubes, crics and central lines are a few of the skills reviewed but, hopefully, rarely needed. Intubations, IVs, meds and the principles of the technology are areas of concentration which should be as familiar as the back of your hand.
Those of us that are hospital based or work in the hospital such as in Flight team members (RNs, RRTs, EMT-Ps) are more familiar with with a procedure such as pericardial centesis since it is done on occasion in the ICU or ED.
As already mentioned, Paramedics did a lot more procedures 30 years ago but medicine evolved with evidence based studies and trauma centers appeared. Some of those procedures are no longer necessary for the field.
Examples: The IO made field central lines unnecessary. Intracardiac epi was found to have little effect on survival. Pericardial centensis may also be of little relevance in the field depending on the age, overall health of the patient and mechanism causing the pericardial sac to fill.