Lown Right Care
Reducing Overuse and Underuse
Anticoagulation in Older Adults
Am Fam Physician. 2020 Jun 15;101(12):748-750.
Author disclosure: No relevant financial affiliations.
Mr. H is an 84-year-old man with well-controlled hypertension and hyperlipidemia. He recently presented to the emergency department with anxiety symptoms, shortness of breath, and palpitations. A clinical examination found an irregular heart rhythm of 140 to 160 beats per minute. An electrocardiogram (ECG) showed atrial fibrillation with no acute ST-T wave changes. After Mr. H received an intravenous dose of a beta blocker, his heart rate quickly decreased to the 80s, and his symptoms resolved. However, a repeat ECG showed that he was in atrial fibrillation. He was admitted for telemetry monitoring, and an oral beta blocker and intravenous heparin were initiated. Laboratory tests showed no evidence of ischemia, anemia, electrolyte imbalance, or thyroid dysfunction. An echocardiogram showed calcification of the aortic and mitral valves but no stenosis or significant regurgitation. A cardiologist recommended prescribing a direct oral anticoagulant to prevent an embolic stroke. However, Mr. H’s primary care physician is concerned about the risks of anticoagulation because of recent functional decline in the patient, including a slowing of his gait without any falls.
Atrial fibrillation is the most common cardiac arrhythmia, occurring in an estimated 2.7 million to 6.1 million people in the United States.1 Approximately 9% of people 65 years and older have this condition, and it occurs more often in men.2 [corrected]Risk factors include hypertension, diabetes mellitus, ischemic heart disease, and older age. Each year atrial fibrillation causes more than 750,000 hospital admissions and more than 130,000 deaths, often associated with strokes.3 An estimated 15% to 20% of strokes occur in patients with underlying atrial fibrillation.4,5
The use of warfarin (Coumadin) and direct oral anticoagulants such as rivaroxaban (Xarelto), apixaban (Eliquis), and dabigatran (Pradaxa) to prevent strokes is the first-line treatment for younger patients with atrial fibrillation. However, the use of direct oral anticoagulants in older people is problematic because of a higher risk of morbidity and mortality from gastrointestinal and intracerebral bleeding, which can be exacerbated by falls.
Practice guidelines recommend risk stratification with the CHA2DS2-VASc tool (congestive heart failure; hypertension; age 75 years or older [doubled]; diabetes mellitus; prior stroke, transient ischemic attack, or thromboembolism [doubled]; vascular disease; age 65 to 74 years; sex category; https://www.mdcalc.com/cha2ds2-vasc-score-atrial-fibrillation-stroke-risk) to identify patients who could benefit from anticoagulation therapy; however, there is a modest predictive ability for ischemic stroke.6–8 Some physicians use the CHA2DS2-VASc tool to determine whether to initiate anticoagulation therapy without considering the patient’s functional status and bleeding risk, which is not recommended. Bleeding risk scores such as HAS-BLED (hypertension, abnormal renal and liver function, stroke history, bleeding risk, labile international normalized ratio, elderly [older than 65 years], drugs and alcohol use; https://www.mdcalc.com/has-bled-score-major-bleeding-risk) may help assess risk but have limited predictive power.
A 2007 Cochrane review evaluated high-quality placebo-controlled studies comparing the benefits and risks of anticoagulation in atrial fibrillation. Participants were younger (average age 69 years) and had less comorbidity than the general population. After two years, patients taking warfarin experienced 17 out of 1,000 fewer strokes (number needed to treat [NNT] = 59) and five out of 1,000 fewer disabling or fatal strokes (NNT = 200). This distinction is essential because most studies assess only the reduction of all strokes, some of which are mild or quickly resolve. Compared with those who received placebo, participants who were treated with warfarin experienced 40 out of 1,000 more severe bleeds (number needed to harm [NNH] = 25), six of which were fatal, and six out of 1,000 more developed hemorrhagic strokes (NNH = 83 for fatal bleeds and hemorrhagic strokes combined). There was no difference in all-cause mortality.9
Few older people are included in randomized controlled trials of anticoagulation; therefore, there are limited data about risks in this population.10,11 A 2018 cohort study examined the risks and benefits of anticoagulation in people 90 years and older. Fifteen out of 1,000 averted strokes with anticoagulation therapy (NNT = 67), and the rate of averting a stroke was similar between warfarin and direct oral anticoagulants. In the direct oral anticoagulant arm, four out of 1,000 had a hemorrhagic stroke vs. 16 out of 1,000 in the warfarin arm. In each group using anticoagulation therapy, approximately 60 out of 1,000 participants had major bleeds.12
It is unclear how often older people with comorbidities that would increase the risk of bleeding (e.g., prior bleeding events, prior reactions
Referencesshow all references
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This series is coordinated by Kenny Lin, MD, MPH, deputy editor.
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