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Hendrikx, Tijn
Publications (8 of 8) Show all publications
Hendrikx, T., Sundqvist, M., Sandström, H., Sahlin, C., Rohani, M., Al-Khalili, F., . . . Franklin, K. A. (2017). Atrial fibrillation among patients under investigation for suspected obstructive sleep apnea. PLoS ONE, 12(2), Article ID e0171575.
Open this publication in new window or tab >>Atrial fibrillation among patients under investigation for suspected obstructive sleep apnea
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2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 2, article id e0171575Article in journal (Refereed) Published
Abstract [en]

STUDY OBJECTIVES: Obstructive sleep apnea is common among patients with atrial fibrillation, but the prevalence and risk factors for atrial fibrillation among patients who are being investigated on suspicion of sleep apnea are not well known. The aim of the study was to estimate the prevalence of atrial fibrillation among patients investigated for suspected obstructive sleep apnea and to identify risk factors for atrial fibrillation among them.

METHODS: The prevalence of atrial fibrillation was investigated among 201 patients referred for suspected obstructive sleep apnea. Patients without known atrial fibrillation were investigated with a standard 12-lead ECG at hospital and short intermittent handheld ECG recordings at home, during 14 days.

RESULTS: Atrial fibrillation occurred in 13 of 201 subjects (6.5%), and in 12 of 61 men aged 60 years and older (20%). The prevalence of atrial fibrillation increased with sleep apnea severity (p = 0.038). All patients with atrial fibrillation were men and all had sleep apnea. Age 60 or older, the occurrence of central sleep apnea and diabetes mellitus were independent risk factors for atrial fibrillation after adjustments for body mass index, gender, sleep apnea and cardiovascular disease.

CONCLUSIONS: Atrial fibrillation is common among subjects referred for sleep apnea investigation and the prevalence of atrial fibrillation increases with sleep apnea severity. Independent risk factors for atrial fibrillation among patients investigated for suspected obstructive sleep apnea include the occurrence of coexisting central sleep apnea, age 60 years or older and diabetes mellitus.

National Category
Respiratory Medicine and Allergy
Identifiers
urn:nbn:se:umu:diva-131353 (URN)10.1371/journal.pone.0171575 (DOI)000393712500051 ()28178304 (PubMedID)
Available from: 2017-02-13 Created: 2017-02-13 Last updated: 2018-06-09Bibliographically approved
Hendrikx, T. (2015). Catch Atrial Fibrillation, Prevent Stroke: Detection of atrial fibrillation and other arrhythmias with short intermittent ECG. (Doctoral dissertation). Umeå: Umeå University
Open this publication in new window or tab >>Catch Atrial Fibrillation, Prevent Stroke: Detection of atrial fibrillation and other arrhythmias with short intermittent ECG
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Atrial fibrillation (AF) is the most common arrhythmia in the adult population, affecting about 5% of the population over 65 years. Occurrence of AF is an independent risk factor for stroke, and together with other cardiovascular risk factors (CHADS2/CHA2DS2- VASc), the stroke risk increases. Since AF is often paroxysmal and asymptomatic (silent) it may remain undiagnosed for a long time and many AF patients are not discovered before suffering a stroke.

Aims: To estimate the prevalence of previously undiagnosed AF in an out-of-hospital population with CHADS2 ≥1, in patients with an enlarged left atrium (LA) and of total AF prevalence in sleep apnea (SA) patients, conditions that have been associated with AF. To compare the efficacy of short intermittent ECG with continuous 24h Holter ECG in detecting arrhythmias.

Methods: Patients without known AF recorded 10−30 second handheld ECG (Zenicor-EKG®) registrations during 14−28 days at home, both regular, asymptomatic registrations twice daily and when having cardiac symptoms. Recordings were transmitted through the in-built SIM card to an internet-based database. Patients with palpitations or dizziness/presyncope referred for 24h Holter ECG were asked to additionally record 30-second handheld ECG registrations during 28 days at home.

Results: In the out-of-hospital population with increased stroke risk, previously unknown AF was diagnosed in 3.8% of 928 patients. Comparing AF detection in patients with an enlarged LA versus normal LA showed that eleven of 299 patients had AF. Five of these had an enlarged LA (volume/BSA). No statistical difference in AF prevalence was found between patients with enlarged and normal LA, 3.3% and 3.2% respectively, (p = 0.974). AF occurred in 7.6% of 170 patients with sleep apnea, in 15% of patients with sleep apnea ≥60 years, and in 35% of patients with central sleep apnea. AF prevalence was also associated with severity of sleep apnea, male gender and diabetes. Comparing the efficacy of arrhythmia detection in 95 patients with palpitations or dizziness/presyncope with continuous 24h Holter and short intermittent ECG, 24h Holter found AF in two and AV-block II in one patient, resulting in 3.2% relevant arrhythmias detected. Short intermittent ECG diagnosed nine patients with AF, three with PSVT and one with AV-block II, in total 13.7% relevant arrhythmias. (p = 0.0094).

Conclusions: Screening in the out-of-hospital patient population (mean age 69.8 years) yielded almost 4% AF, making it seem worthwhile to screen older patients with increased stroke risk for AF with this method. Screening patients with LA enlargement (mean age 73.1 years) did not result in higher detection rates compared with the general out-of-hospital population. AF occurred in 7.6% of patients with sleep apnea, (mean age 57.6 years) and was associated with severity of sleep apnea, presence of central sleep apnea, male gender, age ≥60 years, and diabetes. Short intermittent ECG is more effective in detecting relevant arrhythmias than 24h Holter ECG in patients with palpitations or dizziness/presyncope.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2015. p. 78
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 1695
Keywords
atrial fibrillation, screening, primary prevention, secondary prevention, handheld ECG
National Category
General Practice
Research subject
Cardiology
Identifiers
urn:nbn:se:umu:diva-100497 (URN)978-91-7601-200-0 (ISBN)
Public defence
2015-03-27, Sal 135, Byggnad 9, NUS, Umeå, 09:00 (Swedish)
Opponent
Supervisors
Available from: 2015-03-06 Created: 2015-03-03 Last updated: 2018-06-07Bibliographically approved
Hendrikx, T., Rosenqvist, M., Sandström, H., Persson, M. & Hörnsten, R. (2015). Identifiering av paroxysmala, kortvariga arytmier: intermittent registrering mer effektiv än 24-timmars Holter-EKG. Läkartidningen, 112(1-2), Article ID C6SE.
Open this publication in new window or tab >>Identifiering av paroxysmala, kortvariga arytmier: intermittent registrering mer effektiv än 24-timmars Holter-EKG
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2015 (Swedish)In: Läkartidningen, ISSN 0023-7205, E-ISSN 1652-7518, Vol. 112, no 1-2, article id C6SEArticle in journal (Refereed) Published
Abstract [en]

Many patients suffer from palpitations or dizziness/presyncope. These patients are often referred for Holter ECG (24 hour), although the sensitivity for detecting arrhythmias is low. A new method, short intermittent regular and symptomatic ECG registrations at home, might be a convenient and more sensitive alternative also suitable for primary health care. In this case report we present a patient who had contacted health care several times during a seven year period for paroxysmal palpitations. Routine examination with 24 hour Holter ECG and event recorder did not result in a diagnosis. Using intermittent handheld ECG registration at home, a paroxysmal supraventricular arrhythmia was diagnosed. Further investigation revealed that the patient had a concealed Wolff-Parkinson-White (WPW) syndrome.

Place, publisher, year, edition, pages
Stockholm: Sveriges läkarförbund, 2015
National Category
General Practice
Identifiers
urn:nbn:se:umu:diva-118044 (URN)25584602 (PubMedID)
Available from: 2016-03-10 Created: 2016-03-10 Last updated: 2018-06-07Bibliographically approved
Hendrikx, T., Rosenqvist, M., Wester, P., Sandström, H. & Hörnsten, R. (2014). Intermittent short ECG recording is more effective than 24-hour Holter ECG in detection of arrhythmias. BMC Cardiovascular Disorders, 14, 41
Open this publication in new window or tab >>Intermittent short ECG recording is more effective than 24-hour Holter ECG in detection of arrhythmias
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2014 (English)In: BMC Cardiovascular Disorders, ISSN 1471-2261, E-ISSN 1471-2261, Vol. 14, p. 41-Article in journal (Refereed) Published
Abstract [en]

Background: Many patients report symptoms of palpitations or dizziness/presyncope. These patients are often referred for 24-hour Holter ECG, although the sensitivity for detecting relevant arrhythmias is comparatively low. Intermittent short ECG recording over a longer time period might be a convenient and more sensitive alternative. The objective of this study is to compare the efficacy of 24-hour Holter ECG with intermittent short ECG recording over four weeks to detect relevant arrhythmias in patients with palpitations or dizziness/presyncope.

Methods:

Design: prospective, observational, cross-sectional study. Setting: Clinical Physiology, University Hospital. Patients: 108 consecutive patients referred for ambiguous palpitations or dizziness/presyncope.

Interventions: All individuals underwent a 24-hour Holter ECG and additionally registered 30-second handheld ECG (Zenicor EKG ((R)) thumb) recordings at home, twice daily and when having cardiac symptoms, during 28 days.

Main outcome measures: Significant arrhythmias: atrial fibrillation (AF), paroxysmal supraventricular tachycardia (PSVT), atrioventricular (AV) block II-III, sinus arrest (SA), wide complex tachycardia (WCT).

Results: 95 patients, 42 men and 53 women with a mean age of 54.1 years, completed registrations. Analysis of Holter registrations showed atrial fibrillation (AF) in two patients and atrioventricular (AV) block II in one patient (= 3.2% relevant arrhythmias [95% CI 1.1-8.9]). Intermittent handheld ECG detected nine patients with AF, three with paroxysmal supraventricular tachycardia (PSVT) and one with AV-block-II (= 13.7% relevant arrhythmias [95% CI 8.2-22.0]). There was a significant difference between the two methods in favour of intermittent ECG with regard to the ability to detect relevant arrhythmias (P = 0.0094). With Holter ECG, no symptoms were registered during any of the detected arrhythmias. With intermittent ECG, symptoms were registered during half of the arrhythmia episodes.

Conclusions: Intermittent short ECG recording during four weeks is more effective in detecting AF and PSVT in patients with ambiguous symptoms arousing suspicions of arrhythmia than 24-hour Holter ECG.

Place, publisher, year, edition, pages
BioMed Central, 2014
Keywords
Arrhythmias, Atrial fibrillation, Electrocardiography, Holter ECG, Intermittent ECG
National Category
Cardiac and Cardiovascular Systems
Identifiers
urn:nbn:se:umu:diva-88955 (URN)10.1186/1471-2261-14-41 (DOI)000334546200001 ()
Available from: 2014-05-23 Created: 2014-05-19 Last updated: 2018-06-07Bibliographically approved
Hendrikx, T., Hörnsten, R., Rosenqvist, M. & Sandström, H. (2013). Screening for atrial fibrillation with baseline and intermittent ECG recording in an out-of-hospital population. BMC Cardiovascular Disorders, 13, 41, Article ID 41.
Open this publication in new window or tab >>Screening for atrial fibrillation with baseline and intermittent ECG recording in an out-of-hospital population
2013 (English)In: BMC Cardiovascular Disorders, ISSN 1471-2261, E-ISSN 1471-2261, Vol. 13, p. 41-, article id 41Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: the objective of this study is to investigate the detection rate of undiagnosed atrial fibrillation (AF) with short intermittent ECG recordings during four weeks among out-of-hospital patients, having at least one additional risk factor (CHADS2) for stroke.

METHOD: Design: Cross-sectional study. Setting: Eight family practice centres and two hospital-based out-patient clinics in Sweden. Subjects: 989 out-of-hospital patients, without known AF, having one or more risk factors associated with stroke (CHADS2). Interventions: All individuals were asked to perform 10-second handheld ECG recordings during 28 days, twice daily and when having palpitations. Main outcome measures: Episodes of AF on handheld ECG recordings were defined as irregular supraventricular extrasystoles in series with a duration of 10 seconds.

RESULTS: 928 patients completed registration. AF was found in 35 of 928 patients; 3.8% (95% confidence interval [CI] 2.7--5.2). These 35 patients had a mean age of 70.7 years (SD +/- 7.7; range 53--85) and a median CHADS2 of 2 (range 1--4).

CONCLUSIONS: Intermittent handheld ECG recording over a four week period had a detection rate of 3.8% newly diagnosed AF, in a population of 928 out-of-hospital patients having at least one additional risk factor for stroke. Intermittent handheld ECG registration is a feasible method to detect AF in patients with an increased risk of stroke in whom oral anticoagulation (OAC) treatment is indicated.

Place, publisher, year, edition, pages
London: BioMed Central, 2013
Keywords
Arrhythmia, Atrial fibrillation, Handheld ECG, Stroke prevention, Screening
National Category
Cardiac and Cardiovascular Systems
Identifiers
urn:nbn:se:umu:diva-73635 (URN)10.1186/1471-2261-13-41 (DOI)000320401000001 ()
Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2018-06-08Bibliographically approved
Hendrikx, T., Nilsson, M. & Westman, G. (2008). Sense of coherence in three cross-sectional studies in Northern Sweden 1994, 1999 and 2004: patterns among men and women. Scandinavian Journal of Public Health, 36(4), 340-345
Open this publication in new window or tab >>Sense of coherence in three cross-sectional studies in Northern Sweden 1994, 1999 and 2004: patterns among men and women
2008 (English)In: Scandinavian Journal of Public Health, ISSN 1403-4948, E-ISSN 1651-1905, Vol. 36, no 4, p. 340-345Article in journal (Refereed) Published
Abstract [en]

Aims: To explore changes in sense of coherence (SOC) over a 10-year period in the general population in northern Sweden.

Methods: Three cross-sectional surveys from 1994 (n=1802), 1999 (n=1698) and 2004 (n=1777), conducted within the northern Sweden MONICA Project, were compared. Participants answered questions about gender, age, experience of disease, perceived health, psychosocial factors and Antonovsky's SOC scale with 13 items.

Results: A small, but significant, decrease in SOC medians and a shift of cumulative distributions towards slightly lower SOC values were seen both in the total study population and in its male and female subgroups between 1994 and 1999. No changes were seen between 1999 and 2004, with the exception of women between 25 and 44 years of age, who showed a continuous decrease.

Conclusions: The present study shows that SOC at a population level in northern Sweden, within a 10-year span, is relatively stable, not withstanding minor changes. These small changes might be attributed to societal changes in Sweden during the 1990s and an increase in "minor'' psychiatric complaints in the Swedish population as a whole during the same period.

Place, publisher, year, edition, pages
Oslo: Taylor & Francis, 2008
Keywords
gender, general population, sense of coherence, WHO MONICA project
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:umu:diva-117496 (URN)10.1177/1403494808089560 (DOI)000257536300002 ()18539687 (PubMedID)
Available from: 2016-03-03 Created: 2016-03-01 Last updated: 2018-06-07Bibliographically approved
Hendrikx, T., Sundqvist, M., Hörnsten, R., Sandström, H., Sahlin, C., Rohani, M., . . . Franklin, K. A.Atrial fibrillation in patients with sleep apnea.
Open this publication in new window or tab >>Atrial fibrillation in patients with sleep apnea
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(English)Manuscript (preprint) (Other academic)
National Category
Cardiac and Cardiovascular Systems Respiratory Medicine and Allergy
Identifiers
urn:nbn:se:umu:diva-100519 (URN)
Available from: 2015-03-04 Created: 2015-03-04 Last updated: 2018-06-07Bibliographically approved
Hendrikx, T., Mårten, R., Wester, P., Hörnsten, R. & Sandström, H. Screening for atrial fibrillation in patients with left atrial enlargement.
Open this publication in new window or tab >>Screening for atrial fibrillation in patients with left atrial enlargement
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(English)In: Article in journal (Other academic) Submitted
National Category
Cardiac and Cardiovascular Systems
Identifiers
urn:nbn:se:umu:diva-100518 (URN)
Available from: 2015-03-04 Created: 2015-03-04 Last updated: 2018-06-07Bibliographically approved
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