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Published on: February 26, 2013
Comparison of Atrial Fibrillation in the Young versus That in the Elderly: A Review
Rajiv Sankaranarayanan1, Graeme Kirkwood, Katharine Dibb
1Unit of Cardiac Physiology, Cardiovascular Research Group, 3rd Floor, Core Technology Facility, The University of Manchester, M139PL, Grafton Street, Manchester M13 9NT, UK ; Manchester Heart Centre, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WPL, UK.
Insights
Atrial fibrillation (AF) affects both young and old, challenging traditional views of its causes. This review explores the evolving understanding of AF pathophysiology across different age groups.
Area of Science:
- Cardiology
- Electrophysiology
- Gerontology
Background:
- Atrial fibrillation (AF) incidence and prevalence are rising globally, straining healthcare systems.
- AF presents heterogeneously, influenced by patient-specific factors, age, and underlying pathophysiology.
- While aging is a key risk factor, AF also impacts younger individuals, often presenting symptomatically.
Purpose of the Study:
- To critically evaluate the traditional distinctions in AF epidemiology, pathophysiology, and clinical presentation between younger and elderly populations.
- To explore the increasing evidence blurring the lines between "lone AF" in the young and idiopathic AF in the elderly.
- To highlight the impact of advanced diagnostic techniques on identifying novel causes of AF and redefining "lone AF".
Main Methods:
- Review of existing literature on atrial fibrillation pathophysiology in different age groups.
- Comparative analysis of epidemiological data, etiological factors, and clinical features of AF in the young versus the elderly.
- Discussion of the role of pulmonary vein triggers and atrial substrate abnormalities.
Main Results:
- Traditional models differentiating young (trigger-dominant) and elderly (substrate-dominant) AF are increasingly challenged by evidence of substrate abnormalities in young patients and idiopathic causes in the elderly.
- Novel diagnostic techniques are revealing diverse etiologies, questioning the concept of "lone AF" as a distinct entity.
- Significant differences in AF presentation and underlying mechanisms exist between age groups, necessitating tailored management.
Conclusions:
- The pathophysiology of atrial fibrillation is more complex and less age-differentiated than previously thought.
- A nuanced understanding of AF across the lifespan is crucial for developing effective, individualized management strategies.
- Further research is needed to fully elucidate the heterogeneous mechanisms driving AF and optimize treatment protocols.
Abstract:
The incidence and prevalence of atrial fibrillation (AF) are projected to increase significantly worldwide, imposing a significant burden on healthcare resources. The disease itself is extremely heterogeneous in its epidemiology, pathophysiology, and treatment options based on individual patient characteristics. Whilst ageing is well recognised to be an independent risk factor for the development of AF, this condition also affects the young in whom the condition is frequently symptomatic and troublesome. Traditional thinking suggests that the causal factors and pathogenesis of the condition in the young with structurally normal atria but electrophysiological "triggers" in the form of pulmonary vein ectopics leading to lone AF are in stark contrast to that in the elderly who have AF primarily due to an abnormal substrate consisting of fibrosed and dilated atria acting in concert with the pulmonary vein triggers. However, there can be exceptions to this rule as there is increasing evidence of structural and electrophysiological abnormalities in the atrial substrate in young patients with "lone AF," as well as elderly patients who present with idiopathic AF. These reports seem to be blurring the distinction in the pathophysiology of so-called idiopathic lone AF in the young versus that in the elderly. Moreover with availability of improved and modern investigational and diagnostic techniques, novel causes of AF are being reported thereby seemingly consigning the diagnosis of "lone AF" to a rather mythical existence. We shall also elucidate in this paper the differences seen in the epidemiology, causes, pathogenesis, and clinical features of AF in the young versus that seen in the elderly, thereby requiring clearly defined management strategies to tackle this arrhythmia and its associated consequences.
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