• George L Jackson, Benjamin J Powers, Ranee Chatterjee, Janet Prvu Bettger, Alex R Kemper, Vic Hasselblad, Rowena J Dolor, R Julian Irvine, Brooke L Heidenfelder, Amy S Kendrick, Rebecca Gray, and John W Williams.
• Ann. Intern. Med. 2013 Feb 5; 158 (3): 169-78.

BackgroundThe patient-centered medical home (PCMH) describes mechanisms for organizing primary care to provide high quality care across the full range of individuals' health care needs.It is being widely implemented by provider organizations and third party payers.PurposeTo describe approaches for PCMH implementation and summarize evidence for effects on patient and staff experiences,process of care, and clinical and economic outcomes.Data SourcesPubMed (through 6 December 2011), Cumulative Index to Nursing & Allied Health Literature, and the Cochrane Database of Systematic Reviews (through 29 June 2012).Study SelectionEnglish-language trials and longitudinal observational studies that met criteria for the PCMH, as defined by the Agency for Healthcare Research and Quality, and included populations with multiple conditions.Data ExtractionInformation on study design, populations, interventions,comparators, financial models, implementation methods,outcomes, and risk of bias were abstracted by 1 investigator and verified by another.Data SynthesisIn 19 comparative studies, PCMH interventions had a small positive effect on patient experiences and small to moderate positive effects on the delivery of preventive care services(moderate strength of evidence). Staff experiences were also improved by a small to moderate degree (low strength of evidence).Evidence suggested a reduction in emergency department visits(risk ratio [RR], 0.81 [95% CI, 0.67 to 0.98]) but not in hospital admissions (RR, 0.96 [CI, 0.84 to 1.10]) in older adults (low strength of evidence). There was no evidence for overall cost savings.LimitationSystematic review is challenging because of a lack of consistent definitions and nomenclature for PCMH.ConclusionThe PCMH holds promise for improving the experiences of patients and staff and potentially for improving care processes,but current evidence is insufficient to determine effects on clinical and most economic outcomes

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