<abstract xmlns="http://www.w3.org/1999/xhtml"><p> It is estimated that nearly 20% of all cerebral infarctions in the total population are the result of a complication of atrial fibrillation (AF). While oral anticoagulation with vitamin K antagonists (AVKs) substantially reduces this risk, this requires regular monitoring of the international normalized ratio (INR) in order to achieve therapeutic levels (2,0-3,0). The aim of this study was to evaluate a group at high risk of cerebral infarction, among patients with AF undergoing long-term treatment with VKAs, taking into account the significance of therapeutic INR values. The analysed group consisted of 90 acute ischaemic stroke patients with paroxysmal or chronic “non-valvular” AF, receiving treatment with VKAs. As a result of the study, therapeutic INR values (≥ 2) were seen in thirty-five of these individuals (38,8%), while 55 (61,2%) showed non-therapeutic INR values. Moreover, there were no differences in demographics, vascular risk factors, biochemical and morphological blood parameters, mean CHA2DS2-VASc score and TOAST classification between either of the two groups. Furthermore, no additional factor that would increase their risk of cerebral infarction during the adequate treatment with VKAs was found. However, patients with non-therapeutic INR values had a statistically significantly higher frequency of concomitant moderate pathology of the bicuspid valve, p&lt;0.05. Hence, a lack of proper control of INR can proved to be particularly dangerous for this subgroup of patients. Hence, this is a group with an elevated risk of cerebral infarction and therefore requires special oversight of VKA treatment or NOA treatment.</p></abstract>

It is estimated that nearly 20% of all cerebral infarctions in the total population are the result of a complication of atrial fibrillation (AF). While oral anticoagulation with vitamin K antagonists (AVKs) substantially reduces this risk, this requires regular monitoring of the international normalized ratio (INR) in order to achieve therapeutic levels (2,0-3,0). The aim of this study was to evaluate a group at high risk of cerebral infarction, among patients with AF undergoing long-term treatment with VKAs, taking into account the significance of therapeutic INR values. The analysed group consisted of 90 acute ischaemic stroke patients with paroxysmal or chronic “non-valvular” AF, receiving treatment with VKAs. As a result of the study, therapeutic INR values (≥ 2) were seen in thirty-five of these individuals (38,8%), while 55 (61,2%) showed non-therapeutic INR values. Moreover, there were no differences in demographics, vascular risk factors, biochemical and morphological blood parameters, mean CHA2DS2-VASc score and TOAST classification between either of the two groups. Furthermore, no additional factor that would increase their risk of cerebral infarction during the adequate treatment with VKAs was found. However, patients with non-therapeutic INR values had a statistically significantly higher frequency of concomitant moderate pathology of the bicuspid valve, p<0.05. Hence, a lack of proper control of INR can proved to be particularly dangerous for this subgroup of patients. Hence, this is a group with an elevated risk of cerebral infarction and therefore requires special oversight of VKA treatment or NOA treatment.

The international normalized ratio (INR) as seen in a population of patients with atrial fibrillation and cerebral infarction undergoing long-term treatment with vitamin K antagonists

Stroke Unit, Department of Neurology, Medical University of Lublin, Jaczewskiego 8, 20-954 Lublin, Poland

Stroke Unit, Neurology Department of the John Paul II Autonomous Public Voivodeship Hospital, 22-410 Zamosc, Poland

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This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

It is estimated that nearly 20% of all cerebral infarctions in the total population are the result of a complication of atrial fibrillation (AF). While oral...

The international normalized ratio (INR) as seen in a population of patients with atrial fibrillation and cerebral infarction undergoing long-term treatment with vitamin K antagonists

Published Online: Dec 30, 2015

Page range: 269 - 272

Received: Oct 12, 2015

Accepted: Nov 27, 2015

DOI: https://doi.org/10.1515/cipms-2015-0087

Keywords
atrial fibrillation, cerebral infarction, international normalized ratio (INR), vitamin K antagonists

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The international normalized ratio (INR) as seen in a population of patients with atrial fibrillation and cerebral infarction undergoing long-term treatment with vitamin K antagonists

Published Online: Dec 30, 2015

Page range: 269 - 272

Received: Oct 12, 2015

Accepted: Nov 27, 2015

DOI: https://doi.org/10.1515/cipms-2015-0087

Keywordsatrial fibrillation, cerebral infarction, international normalized ratio (INR), vitamin K antagonists

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
atrial fibrillation, cerebral infarction, international normalized ratio (INR), vitamin K antagonists