Top 20 Research Studies of 2019 for Primary Care Physicians

Every year for the past 21 years, a team of experts in evidence-based medicine have systematically reviewed more than 110 English-language research journals to identify the original research most likely to change and improve primary care practice. The team includes experts in family medicine, pharmacology, hospital medicine, and women's health.1,2

The goal of this process is to identify POEMs (patient-oriented evidence that matters). A POEM must report at least one patient-oriented outcome, such as improvement in symptoms, morbidity, or mortality. It should also be free of important methodologic bias, making the results valid and trustworthy. Finally, if applied in practice, the results would change what some family physicians do in patient care by prompting them to adopt a beneficial new practice or discontinue one that is ineffective or harmful. This should improve patient outcomes. Of more than 20,000 research studies published in 2019 in the journals reviewed by the POEMs team, 254 met criteria for validity, relevance, and practice change.

The Canadian Medical Association (CMA) purchases a subscription to POEMs for its members, many of whom receive the daily POEM by email. When members read a POEM, they can rate it with a validated questionnaire called the Information Assessment Method. POEM ratings address the domains of clinical relevance, cognitive impact, use in practice, and expected health benefits if that POEM were to be applied in patient care.3,4 In 2019, each of the 254 POEMs were rated by an average of 1,530 physicians.

In this article, we present the 20 POEMs rated highest for clinical relevance by CMA members in 2019. This installment of our annual series (https://www.aafp.org/afp/toppoems) summarizes the clinical question and bottom-line answer for each research study identified as a top 20 POEM, organized by topic and followed by a brief discussion. We also present the three most relevant practice guidelines identified by CMA members. The full text of the POEMs in this article are available at https://www.aafp.org/afp/poems2019.

Hypertension

Hypertension is among the most common conditions managed by primary care physicians and is the topic of the two POEMs rated most relevant to readers in 2019 (Table 1).5,6 Researchers randomized 19,168 adults with hypertension to take their antihypertensive medications at bedtime or first thing in the morning.5 Patients were prescribed...