Secondary Prevention By Structured Semi-Interactive Stroke Prevention Package in INDIA (SPRINT INDIA) Study (SPRINT)

Stroke is the second leading cause of death worldwide in 2010. In rural Maharashtra, it is the leading cause of death. The Stroke incidence in India ranges from 135 to 145 per 100,000 population. From the recent Ludhiana population-based Stroke Registry and also from the INSPIRE Registry 25% of the patients are below 49 years of age. Hypertension, smoking, alcohol, diabetes, heart disease and lifestyle-related problems are the common causes of stroke in India. Rheumatic heart disease and cerebral venous thrombosis are the main etiologies of stroke in the young in our country.

Recurrent stroke

In an Oxfordshire Community Stroke Project reported in 1994, it was found that actuarial risk of suffering a recurrence was 30% (95% confidence interval, 20% to 39%) by 5 years, about nine times the risk of stroke in the general population. The risk was highest early after the first stroke: 13% (95% confidence interval, 10% to 16%) by 1 year, 15 times the risk in the general population. After the first year, the average annual risk was about 4%.

In the Copenhagen Stroke Study, stroke was recurrent in 23% despite most of these patients being given prophylactic treatment prior to recurrence. Only 12% of patients with atrial fibrillation were receiving anticoagulant treatment prior to recurrence. In multivariate analysis, recurrence was more frequently associated with a history of transient ischemic attack (TIA), atrial fibrillation, male gender, and hypertension, but not with age, daily alcohol consumption, smoking, diabetes, ischemic heart disease, serum cholesterol or hematocrit. Mortality was almost doubled compared with patients with a first-ever stroke. In survivors, however, both neurologic and functional outcomes and the speed of recovery were, in general, similar in the two groups. Despite similar neurologic impairments, patients with recurrence contralateral to their first stroke had markedly more severe functional disability after completed rehabilitation than patients with ipsilateral recurrence, implying that the ability to compensate functionally is decreased in patients with contralateral recurrence.

However, recently the rates of stroke recurrence have changed in developed countries. On average, the annual risk for future ischemic stroke after an initial ischemic stroke or TIA is ≈3% to 4%. Recent clinical trials of patients with non-cardio embolic ischemic stroke suggest the risk may be as low as 3%, but these data probably underestimate the community-based rate. The estimated risk for an individual patient will be affected by specific characteristics of the event and the person, including age, event type, comorbid illness, and adherence to preventive therapy. The current average annual rate of future stroke (≈3%-4%) represents a historical low that is the result of important discoveries in prevention science. These include antiplatelet therapy and effective strategies for the treatment of hypertension, atrial fibrillation, arterial obstruction and hyperlipidemia.

Even in developed nations currently, there are large gaps in the utilization of preventive drugs, control of risk factors, and uptake of lifestyle-changing behaviours. This is often because of failure in the initiation of secondary prevention.

Novel methods to improve the risk factor control to prevent recurrent stroke

In 2017, the number of mobile phone users is forecast to reach 4.77 billion. The number of mobile phone users in the world is expected to pass the five billion mark by 2019. In 2014, nearly 60 per cent of the population worldwide already owned a mobile phone. Mobile phone text messages can be used to remind, encourage, and motivate patients to adhere to secondary prevention strategies, but there has been limited robust scientific evaluation of these interventions.

Recurrent stroke in India

Data on recurrent stroke and its causes are scarce from low and middle-income countries like India. In the door-to-door survey done in Kolkata, 15% of patients had a recurrent stroke.