Introduction:

Anticoagulant therapy has demonstrated efficacy in preventing cardioembolic complications. However, adherence is probably the most important determinant of the quality of anticoagulation.

Objective:

The aim of this research wasto determine the factors that influence adherence to anticoagulation therapy and the stability of the international normalized ratio (INR).

Methods:

Between September 1, 2018 and December 1, 2020was conducted an analytical, observational andprospective study, corresponding to a pharmacoepidemiological study of drug utilization (Therapeutic Scheme). The object of this study were patients with a diagnosis of coagulation disorders, in the health area of the municipality of Manzanillo. The research data were obtained through an interview and their clinical history. The Xi-squared test (X2), Student's t-test, ANOVA and Kruskall Wallis were used, with a value of p = 0.05 in statistical processing.

Results:

As a result, a low level of pharmacotherapeutic adherence was observed in the studied population. The sociodemographic variables associated with adherence were sex, education and occupation. There was an association between economic resources, patients' knowledge of their disease, compliance with nonpharmacological treatment, and compliance with pharmacological treatment and adherence. Also, adverse drug reactions and drug availability were the treatment-related factors associated with adherence. And, physician orientation to the patient, patient follow-up, and physician-patient relationship were the physician-dependent factors.

Conclusions:

To sump up, the five dimensions of adherence proposedbyWHO (socioeconomic, patient-related, disease-related, treatment-related and health system-related factors) were associated with adherence and stability of the international standardization index.

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