As others have posted, the CEN is much more challenging than the TNCC (and way more in depth). The TNCC is as stated before a 2 day course. I am not sure where the poster who states it is more doctor oriented is coming from. Its focus is obviously on traumatic injury. You focus an assessment from ABC's, and then head to toe. Knowing the mechanism of injury is essential in helping your care promptly for a trauma patient. I think that as nurses in an ER (traum or not), we essentially learn thru experience what to anticipate with trauma patients, and we do think in terms of diagnosis (medical, not nursing). The TNCC makes you think in terms of intervention - based on symptoms seen. If someone comes in from a car accident and is short of breath we are going to intervene first by assessing their airway, then their breathing, and are going to know exactly what the doctor is going to want (CT or xray of chest), however these tests are after we make sure their airway is secure...sorry to get on my soapbox.
Nurses do not simply do nursing care plans
. We are using evidence based practice more and more, and developing more and more autonomy (based on your hospital's polilcies and proceedures). The more certifications you can obtain, the higher your level of knowledge - the best thing to strive for as a nurse in my humble opinion.
Don't try to do your CEN without substantial experience behind you - or if you have a photographic memory and a study guide - like a friend of mine - go for it. Good luck!