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Atrial fibrillation monitoring to reduce thromboembolic risk: Selecting the patient and the monitoring device
Monitorização eletrocardiográfica para a redução do risco tromboembólico: seleção do doente e do dispositivo de monitorização
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Rui Providência" "autores" => array:2 [ 0 => array:4 [ "nombre" => "Sérgio" "apellidos" => "Barra" "email" => array:1 [ 0 => "sergioncbarra@gmail.com" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "Rui" "apellidos" => "Providência" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "Cardiology Department, Papworth Hospital NHS Foundation Trust, Cambridge, UK" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Barts Heart Centre, Barts Health NHS Trust, London, UK" "etiqueta" => "b" "identificador" => "aff0010" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "pt" => array:1 [ "titulo" => "Monitorização eletrocardiográfica para a redução do risco tromboembólico: seleção do doente e do dispositivo de monitorização" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and is associated with a five-fold increased risk of stroke. At least 15-20% of strokes are attributed to underlying AF, but subclinical AF may be the cause of an additional number of cerebrovascular events. Data from cardiac implantable electronic devices (CIEDs) have shown that subclinical atrial tachyarrhythmias lasting more than six minutes are associated with increased risk of thromboembolism.<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">1</span></a> The often silent and intermittent nature of AF poses a problem; more than half of AF episodes are asymptomatic<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">2,3</span></a> and therefore identifying patients at risk remains a challenge. This is a good illustration of the importance of AF monitoring. Continuous monitoring with implantable cardiac monitors is now widely used in patients with cryptogenic stroke to identify those with silent AF who warrant antithrombotic therapy.<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">4</span></a> In this context, the prevalence of AF is approximately 20%. Stroke guidelines state that prolonged rhythm monitoring for AF of approximately 30 days is reasonable within six months of a cerebrovascular event with no apparent cause.<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">5</span></a> In addition to risk stratification for stroke prevention, AF monitoring and detection is also useful to assess the efficacy of rhythm control strategies, prevent inappropriate shocks in implantable cardioverter-defibrillator (ICD) patients and maximize the benefit of cardiac resynchronization therapy (CRT).</p><p id="par0010" class="elsevierStylePara elsevierViewall">Detection of subclinical atrial tachyarrhythmias can be performed through a variety of tools, including external surface monitoring with intermittent 12-lead electrocardiogram, ambulatory Holter monitors, cardiac event recorders, portable electrocardiogram recorders (such as AliveCor) and the more recent adhesive patch electrocardiographic monitors, as well as CIEDs such as implantable loop recorders, dual-chamber pacemakers or ICDs and CRT devices. Although longer-term Holter and event recorders have superior diagnostic yield compared to intermittent 12-lead ECGs,<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">6</span></a> the need for a transmitter device and lower patient compliance represent limitations. Patient compliance diminishes as the nominal monitoring duration increases, owing to concerns regarding skin irritation and the inconvenience of performing daily activities while wearing a monitor. More recent methods include simpler patch-type monitors which provide instant feedback and may lead to immediate changes in medical management. In patients with CIEDs, the possibility of continuous long-term monitoring increases the monitoring sensitivity. In the setting of post-cryptogenic stroke, long-term continuous monitoring with an implantable cardiac monitor has been shown to be superior in detecting AF to any intermittent monitoring strategy.<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">7</span></a> However, their applicability is hampered by the need for an invasive procedure. Ideally, the optimal monitoring device should be non-invasive, inexpensive, simple to use and able to provide continuous long-term monitoring with immediate feedback.</p><p id="par0015" class="elsevierStylePara elsevierViewall">In this issue of the <span class="elsevierStyleItalic">Journal</span>, Primo et al. have elegantly provided an assessment of the prevalence of AF, based on episodes of atrial arrhythmia lasting for more than 30 seconds, obtained through a 12-lead Holter monitor.<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">8</span></a> Their study cohort included patients referred for Holter monitoring for a variety of reasons, as determined by their general practitioners. The main strengths of this study are (1) its prospective nature, (2) the use of 12-lead electrocardiographic monitoring, which enables more accurate determination of the underlying rhythm (with potential therapeutic implications) compared to the standard three-lead Holter, (3) continuous 24-hour monitoring, as opposed to a single 12-lead ECG as used in the FAMA study,<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">9</span></a> with improved diagnostic yield, (4) the inclusion of a relatively unbiased population of patients seen due to a variety of cardiovascular symptoms, enabling a more accurate representation of AF prevalence in this context, (5) an independent and blinded analysis by up to three different electrophysiologists, and (6) the large size of the study sample, allowing narrow 95% confidence intervals.</p><p id="par0020" class="elsevierStylePara elsevierViewall">Several important observations can be made on the results of this study. Firstly, more than 10 out of 100 patients participating in this study had documented AF or atrial flutter (of which one fifth with paroxysmal AF). This figure is higher than previously reported in both European and American studies,<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">10,11</span></a> although AF prevalence in individuals aged 80 years or older may indeed be well above 10%.<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">10</span></a> In 2010, the number of adults aged ≥55 years with AF corresponded to 1.8% of the total European Union population, and this figure will rise to 3.5% by 2060. This increase will be particularly dramatic in adults aged over 75.<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">12</span></a> The higher prevalence of AF in the present study is likely a result of the criteria used for patient selection. A higher AF prevalence should be expected in patients who present with cardiovascular symptoms, even if non-specific, compared to a cohort of asymptomatic patients. However, this study does provide us with a reasonably accurate estimate of AF prevalence among symptomatic patients who are typically seen by their general practitioners. The number may be higher in the context of a more specialized cardiology outpatient clinic. It is also noteworthy that advances in treatment for chronic cardiac and non-cardiac conditions, aging populations, and improved ability to diagnose AF through a wider range of monitoring devices may explain the higher prevalence of AF in more recent studies compared with older ones.</p><p id="par0025" class="elsevierStylePara elsevierViewall">Secondly, the vast majority of patients with documented paroxysmal AF had never had any ECG documentation of this arrhythmia and hence only a minority of these were anticoagulated. As the authors state, the very low use of anticoagulation is mainly a reflection of an undiagnosed cohort, although faulty judgments on the risk of bleeding, especially in elderly patients, also help explain the low rate of anticoagulation prescription in AF patients, as shown in the Portuguese setting.<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">13</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">In patients with cardiovascular symptoms, manual pulse palpation should be performed to determine the presence of an irregular pulse that could indicate underlying AF. A 12-lead electrocardiogram should then be performed on all patients in whom a diagnosis of AF is suspected based on the detection of an irregular pulse. The present study demonstrates that 24-hour Holter should also be considered for all of these patients, with consideration of longer monitoring in patients whose characteristics may put them at higher risk of AF: male gender, advanced age, or a history of hypertension, chronic obstructive pulmonary disease, cerebrovascular or ischemic heart disease. Likewise, a large waist circumference, sedentary lifestyle and high alcohol intake are also predictors of AF. Young age should not preclude appropriate investigation, as AF is seen throughout all age strata, as this study shows.</p><p id="par0035" class="elsevierStylePara elsevierViewall">Notwithstanding the unequivocal merit of this study, we should point out that, in patients considered to be at high risk of AF, and especially those who have sustained a cerebrovascular event, 24-hour Holter monitoring may be insufficient. It is well established that the longer a patient is monitored (and this is not exclusive to implantable cardiac monitors), the greater the likelihood of detecting sustained atrial arrhythmias including asymptomatic AF, with subsequent impact on the rate of anticoagulation prescription.<a class="elsevierStyleCrossRefs" href="#bib0150"><span class="elsevierStyleSup">14,15</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The role of AF monitoring for the selection of patients who could benefit from catheter ablation is much less straightforward. AF ablation is mostly indicated in symptomatic patients for quality-of-life purposes. AF ablation in asymptomatic patients is not generally recommended, and this is unlikely to change in the near future unless studies such as the Catheter Ablation Versus Antiarrhythmic Drug Therapy for Atrial Fibrillation (CABANA) trial demonstrate that successful AF ablation can lead to decreased long-term risk of mortality or stroke compared with medical management. Despite promising results by Di Biase et al. in a recent study of heart failure patients with AF,<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">16</span></a> all other evidence supporting the utility of AF ablation in stroke or mortality risk reduction is based on observational data.</p><p id="par0045" class="elsevierStylePara elsevierViewall">To summarize, 24-hour 12-lead Holter monitors are an elegant screening method for patients with a multitude of cardiovascular symptoms, enabling detection of paroxysmal AF or atrial flutter in a non-negligible percentage of patients. In patients with risk factors for AF and especially a recent history of thromboembolism, more prolonged or long-term continuous AF monitoring should be performed wherever possible. Even short-lasting atrial arrhythmias carry a significantly increased risk of thromboembolism and therefore any documented AF of at least a few minutes should lead to consideration of oral anticoagulation prophylaxis as per the CHA<span class="elsevierStyleInf">2</span>DS<span class="elsevierStyleInf">2</span>-VASc score.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Conflicts of interest" ] 1 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:16 [ 0 => array:3 [ "identificador" => "bib0085" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Subclinical atrial fibrillation and the risk of stroke" "autores" => array:1 [ 0 => array:3 [ "colaboracion" => "ASSERT Investigators" "etal" => true "autores" => array:3 [ 0 => "J.S. 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| Ano/Mês | Html | Total | |
|---|---|---|---|
| 2024 Novembro | 6 | 12 | 18 |
| 2024 Outubro | 43 | 37 | 80 |
| 2024 Setembro | 50 | 37 | 87 |
| 2024 Agosto | 45 | 38 | 83 |
| 2024 Julho | 32 | 33 | 65 |
| 2024 Junho | 42 | 19 | 61 |
| 2024 Maio | 35 | 18 | 53 |
| 2024 Abril | 42 | 28 | 70 |
| 2024 Maro | 33 | 22 | 55 |
| 2024 Fevereiro | 40 | 22 | 62 |
| 2024 Janeiro | 26 | 24 | 50 |
| 2023 Dezembro | 25 | 28 | 53 |
| 2023 Novembro | 31 | 32 | 63 |
| 2023 Outubro | 18 | 17 | 35 |
| 2023 Setembro | 19 | 19 | 38 |
| 2023 Agosto | 30 | 15 | 45 |
| 2023 Julho | 20 | 10 | 30 |
| 2023 Junho | 20 | 12 | 32 |
| 2023 Maio | 39 | 27 | 66 |
| 2023 Abril | 23 | 8 | 31 |
| 2023 Maro | 47 | 21 | 68 |
| 2023 Fevereiro | 37 | 22 | 59 |
| 2023 Janeiro | 16 | 24 | 40 |
| 2022 Dezembro | 41 | 19 | 60 |
| 2022 Novembro | 38 | 33 | 71 |
| 2022 Outubro | 41 | 26 | 67 |
| 2022 Setembro | 18 | 32 | 50 |
| 2022 Agosto | 31 | 30 | 61 |
| 2022 Julho | 31 | 41 | 72 |
| 2022 Junho | 23 | 31 | 54 |
| 2022 Maio | 26 | 39 | 65 |
| 2022 Abril | 34 | 28 | 62 |
| 2022 Maro | 29 | 34 | 63 |
| 2022 Fevereiro | 21 | 32 | 53 |
| 2022 Janeiro | 24 | 23 | 47 |
| 2021 Dezembro | 20 | 44 | 64 |
| 2021 Novembro | 30 | 31 | 61 |
| 2021 Outubro | 44 | 51 | 95 |
| 2021 Setembro | 27 | 34 | 61 |
| 2021 Agosto | 25 | 30 | 55 |
| 2021 Julho | 19 | 18 | 37 |
| 2021 Junho | 24 | 31 | 55 |
| 2021 Maio | 26 | 46 | 72 |
| 2021 Abril | 43 | 32 | 75 |
| 2021 Maro | 43 | 25 | 68 |
| 2021 Fevereiro | 54 | 21 | 75 |
| 2021 Janeiro | 41 | 14 | 55 |
| 2020 Dezembro | 37 | 19 | 56 |
| 2020 Novembro | 37 | 19 | 56 |
| 2020 Outubro | 23 | 17 | 40 |
| 2020 Setembro | 59 | 16 | 75 |
| 2020 Agosto | 19 | 14 | 33 |
| 2020 Julho | 62 | 8 | 70 |
| 2020 Junho | 26 | 10 | 36 |
| 2020 Maio | 37 | 16 | 53 |
| 2020 Abril | 51 | 19 | 70 |
| 2020 Maro | 50 | 15 | 65 |
| 2020 Fevereiro | 50 | 18 | 68 |
| 2020 Janeiro | 30 | 11 | 41 |
| 2019 Dezembro | 28 | 6 | 34 |
| 2019 Novembro | 53 | 6 | 59 |
| 2019 Outubro | 40 | 11 | 51 |
| 2019 Setembro | 27 | 10 | 37 |
| 2019 Agosto | 23 | 11 | 34 |
| 2019 Julho | 37 | 11 | 48 |
| 2019 Junho | 53 | 19 | 72 |
| 2019 Maio | 84 | 8 | 92 |
| 2019 Abril | 31 | 18 | 49 |
| 2019 Maro | 27 | 11 | 38 |
| 2019 Fevereiro | 62 | 10 | 72 |
| 2019 Janeiro | 17 | 8 | 25 |
| 2018 Dezembro | 44 | 9 | 53 |
| 2018 Novembro | 113 | 12 | 125 |
| 2018 Outubro | 251 | 15 | 266 |
| 2018 Setembro | 60 | 10 | 70 |
| 2018 Agosto | 64 | 14 | 78 |
| 2018 Julho | 44 | 8 | 52 |
| 2018 Junho | 68 | 17 | 85 |
| 2018 Maio | 49 | 13 | 62 |
| 2018 Abril | 60 | 19 | 79 |
| 2018 Maro | 68 | 14 | 82 |
| 2018 Fevereiro | 27 | 4 | 31 |
| 2018 Janeiro | 33 | 11 | 44 |
| 2017 Dezembro | 46 | 21 | 67 |
| 2017 Novembro | 67 | 24 | 91 |
| 2017 Outubro | 47 | 23 | 70 |
| 2017 Setembro | 53 | 21 | 74 |
| 2017 Agosto | 88 | 35 | 123 |
| 2017 Julho | 37 | 31 | 68 |
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