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open access: Nature Reviews: Key Advances in Medicine

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CARDIOLOGY<br />

Box 1 | Abbreviations and def<strong>in</strong>itions<br />

CHADS2 Congestive heart failure (1 po<strong>in</strong>t)<br />

Hypertension (1 po<strong>in</strong>t)<br />

Age ≥75 years (1 po<strong>in</strong>t)<br />

Diabetes mellitus (1 po<strong>in</strong>t)<br />

Stroke or thromboembolism (2 po<strong>in</strong>ts)<br />

CHA DS -VASc<br />

2 2<br />

Congestive heart failure (1 po<strong>in</strong>t)<br />

Hypertension (1 po<strong>in</strong>t)<br />

Age ≥75 years (2 po<strong>in</strong>ts)<br />

Diabetes mellitus (1 po<strong>in</strong>t)<br />

Sex, female (1 po<strong>in</strong>t)<br />

Vascular disease (1 po<strong>in</strong>t)<br />

Age 65–74 years (1 po<strong>in</strong>t)<br />

Stroke or thromboembolism (2 po<strong>in</strong>ts)<br />

HAS-BLED<br />

Hypertension (uncontrolled blood pressure)<br />

Abnormal renal or liver function<br />

Stroke<br />

Bleed<strong>in</strong>g history or predisposition<br />

Labile <strong>in</strong>ternational normalized ratio (INR)<br />

Elderly (age >65 years)<br />

Drugs concomitantly (for example,<br />

concomitant aspir<strong>in</strong> or nonsteroidal anti<strong>in</strong>flammatory<br />

drugs, or alcohol abuse)<br />

Net cl<strong>in</strong>ical benefit<br />

[ISR with no treatment – ISR on treatment]<br />

– 1.5*[IHR on treatment – IHR with<br />

no treatment]<br />

Abbreviations: IHR, <strong>in</strong>tracranial-hemorrhage rate;<br />

ISR, ischemic-stroke rate.<br />

non<strong>in</strong>ferior to warfar<strong>in</strong> for the primary end<br />

po<strong>in</strong>t of stroke and systemic embolism<br />

(HR 0.79, 95% CI 0.66–0.96, P

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