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Specialty Use Among Patients With Treated Hypertension in a Patient-Centered Medical Home

A Capsule Commentary to this article was published on 20 March 2014

ABSTRACT

BACKGROUND

Little is known about how delivery of primary care in the patient-centered medical home (PCMH) influences outpatient specialty care use.

OBJECTIVE

To describe changes in outpatient specialty use among patients with treated hypertension during and after PCMH practice transformation.

DESIGN

One-group, 48-month interrupted time series across baseline, PCMH implementation and post-implementation periods.

PATIENTS

Adults aged 18–85 years with treated hypertension.

INTERVENTION

System-wide PCMH redesign implemented across 26 clinics in an integrated health care delivery system, beginning in January 2009.

MAIN MEASURES

Resource Utilization Band variables from the Adjusted Clinical Groups case mix software characterized overall morbidity burden (low, medium, high). Negative binomial regression models described adjusted annual differences in total specialty care visits. Poisson regression models described adjusted annual differences in any use (yes/no) of selected medical and surgical specialties.

KEY RESULTS

Compared to baseline, the study population averaged 7 % fewer adjusted specialty visits during implementation (P < 0.001) and 4 % fewer adjusted specialty visits in the first post-implementation year (P = 0.02). Patients were 12 % less likely to have any cardiology visits during implementation and 13 % less likely during the first post-implementation year (P < 0.001). In interaction analysis, patients with low morbidity had at least 27 % fewer specialty visits during each of 3 years following baseline (P < 0.001); medium morbidity patients had 9 % fewer specialty visits during implementation (P < 0.001) and 5 % fewer specialty visits during the first post-implementation year (P = 0.007); high morbidity patients had 3 % (P = 0.05) and 5 % (P = 0.009) higher specialty use during the first and second post-implementation years, respectively.

CONCLUSIONS

Results suggest that more comprehensive primary care in this PCMH redesign enabled primary care teams to deliver more hypertension care, and that many needs of low morbidity patients were within the scope of primary care practice. New approaches to care coordination between primary care teams and specialists should prioritize high morbidity, clinically complex patients.

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Acknowledgements

We thank all members of the study team, including Kelly Ehrlich, MS (project management) and Eric Johnson, MS (analytic support). Clarissa Hsu, PhD, DeAnn Cromp, MPH and Katie Coleman, MSPH supported planning and reviewed early manuscript drafts. We also thank Claire Trescott, MD and Michael Erikson, MSW for their leadership during Group Health’s medical home redesign, and Karen Severson, RN for sharing information about hypertension care protocols at Group Health.

Funding was provided by the National Center for Advancing Translational Sciences (#TL1 RR025016), the Agency for Healthcare Research and Quality (#R18 HS019129) and Group Health Cooperative.

Conflict of Interest

Dr. Fishman, Dr. Rutter and Mr. Ross are employees of Group Health Cooperative, and Dr. Liss is a former employee of Group Health Cooperative. Dr. Reid is an employee and shareholder of Group Health Physicians, the medical group affiliated with Group Health Cooperative.

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Correspondence to David T. Liss PhD.

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Liss, D.T., Fishman, P.A., Rutter, C.M. et al. Specialty Use Among Patients With Treated Hypertension in a Patient-Centered Medical Home. J GEN INTERN MED 29, 732–740 (2014). https://doi.org/10.1007/s11606-014-2776-2

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KEY WORDS

  • primary care redesign
  • patient centered care
  • health care delivery
  • specialty care
  • hypertension