Protocol-directed care in the ICU: making a future generation of intensivists less knowledgeable?

CITATION

Prasad M, Holmboe ES, Lipner RS, Hess BJ, Christie JD, Bellamy SL, Rubenfeld GD, Kahn JM. Clinical Protocols and Trainee Knowledge About Mechanical Ventilation. JAMA. 2011; 306(9):935-941. PubMed PMID: 21900133 This is available on http://www.pubmed.gov

BACKGROUND

Clinical protocols are associated with improved patient outcomes; however, they may negatively affect medical education by removing trainees from clinical decision making.

OBJECTIVE

To study the relationship between critical care training with mechanical ventilation protocols and subsequent knowledge about ventilator management.

DESIGN

A retrospective cohort equivalence study linking a national survey of mechanical ventilation protocol availability with knowledge about mechanical ventilation. Exposure to protocols was defined as high intensity if an intensive care unit had 2 or more protocols for at least 3 years and as low intensity if 0 or 1 protocol.

SETTING

Accredited US pulmonary and critical care fellowship programs.

SUBJECTS

First-time examinees of the American Board of Internal Medicine (ABIM) Critical Care Medicine Certification Examination in 2008 and 2009.

INTERVENTION

N/AOutcomes: Knowledge, measured by performance on examination questions specific to mechanical ventilation management, calculated as a mechanical ventilation score using item response theory. The score is standardized to a mean (SD) of 500 (100), and a clinically important difference is defined as 25. Variables included in adjusted analyses were birth country, residency training country, and overall first-attempt score on the ABIM Internal Medicine Certification Examination.

RESULTS

The 90 of 129 programs (70%) responded to the survey. Seventy seven programs (86%) had protocols for ventilation liberation, 66 (73%) for sedation management, and 54 (60%) for lung-protective ventilation at the time of the survey. Eighty eight (98%) of these programs had trainees who completed the ABIM Critical Care Medicine Certification Examination, totaling 553 examinees. Of these 88 programs, 27 (31%) had 0 protocols, 19 (22%) had 1 protocol, 24 (27%) had 2 protocols, and 18 (20%) had 3 protocols for at least 3 years. 42 programs (48%) were classified as high intensity and 46 (52%) as low intensity, with 304 trainees (55%) and 249 trainees (45%), respectively. In bi-variable analysis, no difference in mean scores was observed in high-intensity (497; 95% CI, 486-507) vs low-intensity programs (497; 95% CI, 485-509). Mean difference was 0 (95% CI, -16 to 16), with a positive value indicating a higher score in the high-intensity group. In multivariable analyses, no association of training was observed in a high-intensity program with mechanical ventilation score (adjusted mean difference, -5.36; 95% CI, -20.7 to 10.0).

CONCLUSIONS

Among first-time ABIM Critical Care Medicine Certification Examination examinees, training in a high-intensity ventilator protocol environment compared with a low-intensity environment was not associated with worse performance on examination questions about mechanical ventilation management.