Hypertension and atrial fibrillation are 2 important public health priorities. There is a gap between evidence-based best management and actual clinical practice. To decrease this gap, clinical practice guidelines (CPGs), based on available evidence are employed. Clinical decision support system ("MedicBK") is a computer-based program that analyzes published evidence and provides prompts and reminders to assist health care providers in implementing clinical guidelines and science-based medicine at the point of care. The INTELLECT II trial is designed as a multicenter, cluster-randomized, single-blind, controlled study with blinded outcome assessment. Approximately 10 centers from Russia will be enrolled. Centers managing patients with symptomatic atrial fibrillation and/or hypertension will be randomized to either patient management with aid of CDSS ("MedicBK") or standard care.