a) it seems the most of these courses are run outside your service organisations many by the private sector for profit? - Why is that?
Outsourcing. On my time off from school I work for a hospital and part of my job is teaching these classes. The hospital does not charge employees for the classes and they are required for continued employment. So technically they are in house.
However, many smaller organizations cannot afford to have all this done in house. So there creates an opportunity for independant contractors to use the same standard curriculum an service many agenices. Many agencies together can usually make steady work for a small group of individuals. The time and expenses do not always make fiscal sense to have in house.
Many of the organizations these classes come from spend millions of dollars to research, update, and come up with these curriculums. It is beyond the means for independant organizations. Don't forget, the US is a pay to play system. Hospital A makes money by having superior service to Hospital B. Certainly they will not give away trade secrets.
(I don't agree with the system, but it is what I have to work with)
b) most involve getting a certificate of some sort which many here seem willing to include as some sort of new or extra credential on top of their existing qualification. - How is that allowed to happen and mustn't it confuse people dealing with EMS who don't understand the system?
The certificates simply state you met the criteria for the class. It is up to the individual agencies to determine their value. None of these classes gives you the authority or right to practice anything you learn in them. It is your primary educational credential that does. So for example if you learn how to do a DPL in ATLS class, then unless you are a qualified physician, you are not permitted to perform one. The same if you were a nurse who learned to intubate, your employer determines your scope.
As for the extra titles, the only people they impress are nonmedical providers.
c) nobody has made it clear whether there are standard additional refresher/supplemental or mandatory programmes for all EMS staff in the US.
Because the US is a federation of states, the individual state decides on the required refresher for the primary credential. The federal government cannot control that. However, many states choose to use the same standards for the purpose of reciprocity between them. MD, DO, RN, PA, Parmedic, EMT, etc. merit badge courses are sometimes required. For example in Ohio, in order to meet the refresher qualification for paramedic you must have a current ACLS card. (to demonstrate you are current with the skills of what is viewed as the primary job of the paramedic) Credentialing agencies will recognize a certain amount of hours for the course for various reasons. So while you may spend 16 hours in an ACLS course. You licensing authority may not recognize all of it or may give you more credit. (usually it is much less)
However,non governmental hospital accrediting agencies, like JCAHO, have a real power to instill their will upon organizations. They are basically recognized as an authority, and the loss of their graces, by not meeting their recommended standards, will cause a facility to not be eligible for federal healthcare monies like medicare and medicade. (which is more than 25% of all payments nationwide) Additionally any healthcare organization not meeting these standards will find that private insurance will not pay for their services either. In short, they are not a government body, they are used by the government as a standard.
It is also one of the reasons EMS tries to firmly plant itself in public safety. A publc safety agency is immune to a considerable amount of standards even outside healthcare.
Just to look at the pages of this thread as Vennificus pointed there are more letters next to peoples names than you can poke a stick at. And why can't organisations carry out all these programmes with their own tutelage and sign off staff who are up to date under local regional or state based standards requirements? (I am well aware you have state and national standards)
As detailed above, many organizations (hospitals, EMS agencies, etc) cannot afford to have their own educational departments. It is much cheaper to use an already established curriculum than it is to research and create your own. (which on the cheap can run hundreds of thousands of dollars a year when you factor in the salaries of the people doing it)
However, your agency can choose not to recognize some or any of these classes. For example, at my employer, they only recognize BLS, ACLS, and PALS from AHA. they do not recognize any other curriculum from any other agency.
In all fairness, many of these classes are put together to be concise information in order to give healthcare providers what they need to do no harm or at least help a little until an expert can be found.
The trouble is, they are not meant to be definitive education. Many people also like the format so everytime somebody has something new to say, they copy the 2 day "do this until somebody who knows shows." It is impossible to maintain all of them and a new one shows up every year. (Like advanced burn life support)
In our system everything is done in house with certain items like RSI, defib etc requiring mandatory periodic re-accreditation. We have a continuing education programme which provides face to face lectures two or three times a year updating knowledge, explaining changes to guidelines etc on top of regular information bulletins, external lecture invitations, group lecture nights and an education department (in which I have worked) that ships out education packages every other week.
Places that can afford that do. It's all about the money.