Uppsala Self-Screening of Cardiovascular Health (U-SCREEN)

BACKGROUND Cardiovascular disease remains the leading cause of death and disability in Sweden and globally. Hypertension, dyslipidemia, diabetes, atrial fibrillation, and chronic kidney disease are largely asymptomatic but treatable conditions for which effective preventive interventions exist. Despite this, a substantial proportion of affected individuals are undiagnosed or untreated. Population-based screening at clinics is resource-intensive and reaches only a fraction of those at risk. Digital tools and home-based self-sampling now make it feasible to scale cardiovascular screening to whole populations at limited marginal cost.

OBJECTIVES To determine whether a home-based multimodal cardiovascular screening program identifies more cardiovascular risk conditions than usual care in middle-aged and older adults. To evaluate the impact of screening on initiation of evidence-based preventive treatment; on cardiovascular events; on healthcare utilization and costs; and on participant-reported outcomes including health-related quality of life.

DESIGN Pragmatic, register-based, two-arm parallel-group randomized controlled trial. Eligible residents in Region Uppsala turning 50, 55, 60, 65, 70 or 75 years during the recruitment period are invited and, after digital informed consent, randomized 1:1 to the screening arm or the control arm.

INTERVENTION (SCREENING ARM)

Participants receive a home package containing:

• A validated automated upper-arm blood pressure monitor with instructions for a 7-day home measurement schedule;
• A dried blood spot sampling kit for self-collection and mail-back analysis of ApoB, HbA1c, and creatinine;
• A digital questionnaire on lifestyle, symptoms, family history, and existing diagnoses and medications.

Results are returned to the participant via a digital portal together with structured advice; participants with findings exceeding pre-specified thresholds receive guideline-directed pharmacotherapy and are referred for clinical follow-up in routine care.

COMPARATOR (CONTROL ARM) Usual care, with no active screening offered as part of the trial.

OUTCOME ASCERTAINMENT Outcomes are ascertained primarily through linkage to Swedish national health registers (the National Patient Register, the Swedish Prescribed Drug Register, the Cause of Death Register, and quality registers including SWEDEHEART and the Swedish Primary Care Cardiovascular Database) and to regional electronic health records.

SAMPLE SIZE AND ANALYSIS The trial targets identification of 10,000 cardiovascular risk conditions. Analyses follow the intention-to-treat principle.