Prerquisite to be certified nurse anesthetist?

The master's program is targeted to outstanding Registered Nurses with critical care experience who possess a baccalaureate degree. Requirements include:

Graduation from an accredited (NLNAC or CCNE) nursing program.
Baccalaureate degree in Nursing or RNs with an appropriate science degree. A bachelor's degree in a natural science is accepted. Examples are Bachelor of Science in Chemistry, Biology, or Physics. If you have another degree, your past academic background is individually considered for predictors of success in our Program, such as a strong science background and good performance.
Minimum of one year recent experience (within the last 5 years) as a professional registered nurse in a critical care area in which the applicant has had the opportunity to develop as an independent decision maker, demonstrate psychomotor skills and the ability to use and interpret advanced monitoring techniques. Direct patient contact is required.
The requirement for critical care is that you have experience as a Registered Nurse in a critical care area, with emphasis placed on invasive hemodynamic monitoring, ventilatory care and pharmacologic management. The preferred areas (with the greatest preference first) are: SICU (Surgical Intensive Care), MICU (Medical Intensive Care), CICU (Cardiac Intensive Care), PICU/NICU (Pediatric or Neonatal Intensive Care). Applicants have also been accepted whose experience is primarily in the Emergency Room, provided they can demonstrate familiarity with invasive monitoring, ventilators, and critical care pharmacology.
Professional/academic competency attested by three letters of recommendation.
Completion of the Graduate Record Exam (GRE) General Test.
An undergraduate cumulative grade point average of 3.0 or above.
Undergraduate coursework: Transcripts should reflect one undergraduate course taken within the last ten years, with a grade of B or above, in each of the following areas: Inorganic chemistry, Organic (or Bio-) chemistry, Anatomy and Physiology, Research Methods.
Submission of a professional autobiography delineating personal goals of graduate study.
Advanced Cardiac Life Support (ACLS) certification.
Pediatric Advanced Life Support (PALS).
Current unencumbered licensure as a professional registered nurse in the state in which the school is located, or ability to obtain the same.

BSRN (with excellent grades), 1-2 years critical care experience and acceptance to a CRNA program (which is 2-3 years)

Most programs want you to have at least a year in critical care prior to applying and martriculation. This is in addtion to a BSN with an active RN license.

These are graduate level programs and they are competitive. You need strong letters, a strong work ethic and top notch grades.