Introduction: E-health has emerged as a pivotal resource in healthcare delivery due to its widespread coverage, ease, and acceptance, particularly for chronic diseases. We aim to establish the effectiveness of structured telemonitoring in managing blood pressure among patients with uncontrolled essential arterial hypertension. Methods: An analytical observational retrospective cohort study of uncontrolled hypertensive patients aged ≥ 18 was conducted, with follow-ups at 150 and 240 days. Patients in the telemonitoring cohort were provided with validated digital blood pressure monitors, underwent remote monitoring, and received weekly feedback for 30 days from a multidisciplinary team. Conversely, the non-telemonitoring cohort received usual care consisting of attendance to in-person medical consultations as part of our institution's cardiovascular-risk-prevention program. Results: 350 patients were included, with median ages of 55 and 66 years in the telemonitoring and non-telemonitoring cohorts, respectively. Over the 240-day follow-up, the telemonitoring group achieved a significant reduction in systolic (-20.99 mmHg; 95% CI 14.99- 27.50; p 0.000) and diastolic blood pressure (- 14.99 mmHg; 95% CI 10.00- 18.99; p 0.000) compared to usual care, which demonstrated reductions of 19.99 mmHg (95% CI 16.49- 22.50; p 0.000) in systolic blood pressure and 6.50 mmHg, (95% CI 4.50- 9.00; p 0.000) in diastolic blood pressure. Conclusion: Telemonitoring is an effective strategy for patients with uncontrolled arterial hypertension, leading to earlier and significant blood pressure reductions.