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Research

Incident atrial fibrillation in the emergency department in Ontario: a population-based retrospective cohort study of follow-up care

Clare L. Atzema, Bing Yu, Noah Ivers, Paula Rochon, Douglas S. Lee, Michael J. Schull and Peter C. Austin
April 30, 2015 3 (2) E182-E191; DOI: https://doi.org/10.9778/cmajo.20140099
Clare L. Atzema
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
2Division of Emergency Medicine, University of Toronto, Toronto, Ont.
6Sunnybrook Health Sciences Centre, Toronto, Ont.
MDMSc
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Bing Yu
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
PhD
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Noah Ivers
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
5Department of Medicine, Department of Family Medicine, University of Toronto, Toronto, Ont.
8Women’s College Hospital, Toronto, Ont.
MDPhD
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Paula Rochon
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
4Division of Geriatric Medicine, University of Toronto, Toronto, Ont.
8Women’s College Hospital, Toronto, Ont.
MDMPH
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Douglas S. Lee
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
3Division of Cardiology, University of Toronto, Toronto, Ont.
7University Health Network, Toronto, Ont.
MDPhD
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Michael J. Schull
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
2Division of Emergency Medicine, University of Toronto, Toronto, Ont.
6Sunnybrook Health Sciences Centre, Toronto, Ont.
MDMSc
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Peter C. Austin
1Institute for Clinical Evaluative Sciences, Toronto, Ont.
PhD
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Article Figures & Tables

Tables

    • View popup
    Table 1: Characteristics of Ontario primary care models (15)
    CharacteristicEnhanced fee-for-service modelCapitation model
    Patient enrolmentOptionalRequired
    After-hours callRequiredRequired
    Fee-for-service paymentFull payment plus 10% premium for 21 comprehensive care servicesPayment at 10% of full rate for 56 services for enrolled patients; established maximum fee-for-service payments annually
    Extended hoursOne 3-hr evening or weekend session per physician per wk, to a maximum of 5 sessions; exempted if > 50% of physicians provide emergency, anesthesia or obstetrics coverageSame as enhanced fee-for-service model
    After-hours careAdditional 20% of fee-for-service payment for enrolled and virtually enrolled patients for 9 basic office servicesSame as enhanced fee-for-service model
    Access bonusNAAdditional payment, reduced if enrolled patient sees an nonspecialist physician outside of group
    Group management and leadershipNAAnnual fee per enrolled patient
    Management of care for heart failureAnnual fee per enrolled patient for coordinating, providing and documenting required elements of care for heart failureSame as enhanced fee-for-service model
    Unattached patient feeA one-time fee for enrolling an acute care patient without a family physician following discharge from an inpatient hospital staySame as enhanced fee-for-service model
    New patient premiumA one-time fee for up to 60 enrolled new patients without a family physician; increase in fee for patients aged 65–74 yr, and a further increase in fee for patients aged 75 yr and overSame as enhanced fee-for-service model

    Note: NA = not applicable.

      • View popup
      Table 2: Characteristics of the study population
      VariableNo. of patients (%)*
      n = 14 907
      Patient characteristics
      Age, yr; mean ± SD65.2 ± 15.9
      Male7 942(53.3)
      Income quintile
      12 491(16.7)
      22 893(19.4)
      32 913(19.5)
      43 198(21.5)
      53 412(22.9)
      Rural residence2 088(14.0)
      Long-term care or nursing home residence248(1.7)
      Immigrant1 195(8.0)
      Past medical history
      Hypertension, recent diagnosis (in the last yr)419(2.8)
      Hypertension, diagnosis made before the last 1 yr8 699(58.4)
      Heart failure, recent diagnosis (in the last yr)225(1.5)
      Heart failure, diagnosis made before the last 1 yr787(5.3)
      Acute myocardial infarction2 156(14.5)
      Coronary artery disease1 726(11.6)
      Coronary artery bypass graft361(2.4)
      Stroke541(3.6)
      Diabetes mellitus2 896(19.4)
      Dementia550(3.7)
      Chronic obstructive pulmonary disease2 426(16.3)
      Asthma2 014(13.5)
      Renal failure527(3.5)
      Nonmetastatic cancer1 895(12.7)
      Metastatic cancer252(1.7)
      CHADS2 score ≥ 25 830(39.1)
      ADG score, mean ± SD9.9 ± 4.2
      Emergency department visit characteristics
      Emergency department triage score (1 = highest acuity)
      1 or 29 916(66.5)
      34 991(33.5)
      No. of patients who arrived by ambulance4 074(27.3)
      Time of day patient presented to emergency department
      00:00–07:592 872(19.3)
      08:00–15:597 640(51.3)
      16:00–23:594 395(29.5)
      Day of week patient presented to emergency department
      Weekday11 492(77.1)
      Weekend3 415(22.9)
      Emergency department physician, sex
      Unknown1 895(12.7)
      Female2 581(17.3)
      Male10 431(70.0)
      Emergency department physician, specialty
      Emergency medicine (3-yr program)5 875(39.4)
      Emergency medicine (5-yr program)1 962(13.2)
      Family medicine3 832(25.7)
      Other1 345(9.0)
      Unknown1 893(12.7)
      Emergency department physician, no. of years of practice; yr
           0–31 900(12.7)
           4–103 686(24.7)
         11–204 219(28.3)
      > 203 159(21.2)
      Unknown1 943(13.0)
      Hospital type
      Community11 285(75.7)
      Small836(5.6)
      Teaching2 786(18.7)
      Family physician characteristics
      Family physician, sex
      Female3 804(25.5)
      Male10 333(69.3)
      Unknown770(5.2)
      Family physician, main specialty
      Family medicine13 981(93.8)
      Emergency medicine146(1.0)
      Unknown780(5.2)
      Family physician, no. of years of practice; yr
           0–5542(3.6)
           6–10901(6.0)
         11–151 353(9.1)
      > 1511 329(76.0)
      Unknown782(5.2)
      No. of patients with a family physician14 146(94.9)
      Family physician’s model type
      CCM† or FHG‡6 613(44.4)
      FHN§ with FHT692(4.6)
      FHN§ without FHT315(2.1)
      FHO¶ with FHT2 271(15.2)
      FHO¶ without FHT3 189(21.4)
      FFS**1 066(7.2)
      Family physician belongs to an FHT2 963(19.9)

      Note: ADG = aggregated diagnosis group, CCM = comprehensive care model, CHADS2 = cardiac failure, hypertension, age, diabetes, stroke system, FFS = fee for service, FHG = family health group, FHN = family health network, FHO = family health organization, FHT = family health team, SD = standard deviation.
*Unless otherwise specified.
†Primarily fee for service, < 3 physicians.
‡Primarily fee for service, ≥ 3 physicians.
§Primarily capitation, small basket of services.
¶Primarily capitation, large basket of services.
**Traditional fee for service.

        • View popup
        Table 3: Follow-up care among patients (n = 14 907) discharged from an emergency department in Ontario with a new diagnosis of atrial fibrillation
        Time to follow-up care, dTotal no. of patients seen (%)No. of patients with follow-up care from family physician only (%)No. of patients with follow-up care from cardiologist or internist only (%)No. of patients with follow-up care from cardiologist or internist, with or without family physician (%)No. of patients with follow-up care from both family physician and cardiologist or internist (%)No. of patients with follow-up care from any of family physician, cardiologist or internist (%)No. of patients who died after discharge
        Within 3 dWithin 7 dWithin 30 d
        1–34 085(27.4)3 094(20.8)787(5.3)991(6.7)204(1.4)4 085(27.4)142161
        1–77 473(50.1)5 311(35.6)1 414(9.5)2 162(14.5)748(5.0)7 473(50.1)143497
        1–3012 229(82.0)6 473(43.4)1 765(11.8)5 756(38.6)3 991(26.8)12 229(82.0)1434120
        > 302 678(18.0)–––––61424
        • View popup
        Table 4: Adjusted odds of obtaining follow-up care from a family doctor, cardiologist or internist within 7 days of emergency department discharge among patients who had a family physician (n = 14 146)
        VariableOR (95% CI)p value
        Patient characteristics
        Age, per decade increase1.09 (1.06–1.12)< 0.001
        Female1.05 (0.98–1.13)0.18
        Income quintile; referent = 1, lowest
        21.07 (0.96–1.20)0.22
        31.04 (0.93–1.16)0.53
        40.95 (0.85–1.06)0.34
        5 (highest)1.05 (0.94–1.17)0.40
        Rural residence0.95 (0.85–1.07)0.44
        Long-term care or nursing home residence0.77 (0.56–1.05)0.09
        Immigrant1.18 (1.04–1.34)0.01
        Past medical history; referent = 0
        Hypertension, recent diagnosis (in the last yr)1.14 (0.92–1.40)0.23
        Hypertension, diagnosis made before the last 1 yr1.15 (1.06–1.26)0.002
        Heart failure, recent diagnosis (in the last yr)0.87 (0.65–1.14)0.31
        Heart failure, diagnosis made before the last 1 yr0.75 (0.64–0.88)< 0.001
        Acute myocardial infarction1.02 (0.92–1.14)0.68
        Coronary artery disease0.83 (0.73–0.94)0.003
        Coronary artery bypass graft1.09 (0.85–1.40)0.49
        Stroke0.78 (0.65–0.94)0.01
        Diabetes mellitus1.06 (0.96–1.17)0.24
        Dementia0.84 (0.69–1.03)0.09
        Chronic obstructive pulmonary disease1.03 (0.93–1.13)0.58
        Asthma1.04 (0.94–1.15)0.44
        Renal failure0.69 (0.57–0.83)< 0.001
        Nonmetastatic cancer0.84 (0.76–0.94)0.002
        Metastatic cancer0.94 (0.72–1.22)0.62
        CHADS2 score ≥ 2; referent = 0 or 10.97 (0.87–1.09)0.65
        ADG score per 1 point increase1.04 (1.03–1.05)< 0.001
        Emergency department visit characteristics
        Emergency department triage score of 1 or 2 (high acuity); referent = 3, 4 or 51.02 (0.94–1.09)0.69
        Patients who arrived by ambulance0.99 (0.91–1.07)0.77
        Time of day patient presented to the emergency department
        00:00–07:590.89 (0.81–0.98)0.01
        16:00–23:590.93 (0.86–1.00)0.05
        Day of week patient presented to the emergency department, weekend0.94 (0.87–1.03)0.17
        Emergency department physician, age per decade increase0.97 (0.84–1.12)0.62
        Emergency department physician, female1.06 (0.93–1. 20)0.34
        Emergency department physician, main specialty;
        referent = family medicine training
        Emergency medicine (3-yr program)0.90 (0.76–1.05)0.16
        Emergency medicine (5-yr program)0.91 (0.75–1.10)0.29
        Other0.93 (0.57–1.53)0.73
        Emergency department physician, no. of years of practice; yr
             4–101.03 (0.91–1.16)0.38
           11–200.98 (0.83–1.15)0.85
        > 200.98 (0.73–1.30)0.86
        Hospital type; referent = community
        Small0.82 (0.69–0.98)0.03
        Teaching1.16 (1.04–1.29)0.007
        Family physician characteristics
        Family physician, age per decade increase1.00 (0.99–1.00)0.24
        Family physician, female0.99 (0.91–1.07)0.82
        Family physician, no. of years of practice; yr
             6–101.02 (0.82–1.27)0.83
           11–151.07 (0.87–1.31)0.54
        > 151.06 (0.86–1.29)0.59
        Family physician, reimbursement type
        CCM* or FHG†; referent
        FHN‡ with FHT0.73 (0.62–0.86)< 0.001
        FHN‡ without FHT0.77 (0.60–0.97)0.03
        FHO§ with FHT0.84 (0.76–0.93)< 0.001
        FHO§ without FHT0.86 (0.79–0.94)0.001
        FFS¶0.94 (0.82–1.07)0.33

        Note: ADG = aggregated diagnosis group, CCM = comprehensive care model, CHADS2 = cardiac failure, hypertension, age, diabetes, stroke system, CI = confidence interval, FFS = fee for service, FHG = family health group, FHN = family health network, FHO = family health organization, FHT = family health team, OR = odds ratio, SD = standard deviation.
*Primarily fee for service, < 3 physicians.
†Primarily fee for service, ≥ 3 physicians.
‡Primarily capitation, small basket of services.
§Primarily capitation, large basket of services.
¶Traditional fee for service.

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        Incident atrial fibrillation in the emergency department in Ontario: a population-based retrospective cohort study of follow-up care
        Clare L. Atzema, Bing Yu, Noah Ivers, Paula Rochon, Douglas S. Lee, Michael J. Schull, Peter C. Austin
        Apr 2015, 3 (2) E182-E191; DOI: 10.9778/cmajo.20140099

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        Incident atrial fibrillation in the emergency department in Ontario: a population-based retrospective cohort study of follow-up care
        Clare L. Atzema, Bing Yu, Noah Ivers, Paula Rochon, Douglas S. Lee, Michael J. Schull, Peter C. Austin
        Apr 2015, 3 (2) E182-E191; DOI: 10.9778/cmajo.20140099
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