Speaker
Ankeet S. Bhatt, MD, MBA, ScM
Cardiologist, Kaiser Permanente San Francisco Medical Center
Research Scientist, Kaiser Permanente Northern California Division of Research
Assistant Professor, Kaiser Permanente Bernard J. Tyson School of Medicine
Adjunct Professor, Stanford University School of Medicine
Keywords
Vaccination; Learning Health System; Implementation Science; Nudges; Influenza; Cardiovascular
Key Points
- Every year, influenza leads to over 500,000 deaths and 3-5 million severe cases globally. It increases the risk of cardiovascular (CV) events like myocardial infarction and heart failure. Though health guidelines strongly recommend annual influenza vaccination, rates remain suboptimal globally and persistent inequities exist. There’s an urgent need for novel, effective, and scalable strategies to improve influenza vaccination rates.
- The KP-VACCINATE trial is one of the largest ever conducted, randomizing over 3.6 million patients in under 30 days. It included several pragmatic elements, such as coordination with existing vaccine promotion efforts; randomization performed by operational health system teams; and endpoint capture fully embedded in the electronic health record.
- The study team assessed the effect of a cardiovascular-focused nudge communication on influenza vaccination rates and found that there was no effect. Despite the negative results, the trial establishes that pragmatic and rapid randomization of communication strategies is operationally feasible at scale with routine healthcare workflows in the US.
Discussion Themes
The study team targeted a larger-than-usual population in order to 1) demonstrate the feasibility of randomization within a large-scale health system, and 2) be well-powered for subgroup analyses that could help tailor future interventions.
Dr. Bhatt viewed the negative result as an illustration of the importance of design and context for interventions based in behavioral science, rather than an indication that nudges are ineffective.
Future directions may include involvement of the broader care team, with primary care providers and specialty providers playing a potentially critical role in nudging patients towards vaccine uptake.