Urban–Rural Comparisons in Hospital Admission, Treatments, and Outcomes for ST-Segment–Elevation Myocardial Infarction in China From 2001 to 2011 A Retrospective.

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Urban–Rural Comparisons in Hospital Admission, Treatments, and Outcomes for ST-Segment–Elevation Myocardial Infarction in China From 2001 to 2011 A Retrospective Analysis From the China PEACE Study (Patient-Centered Evaluative Assessment of Cardiac Events) Xi Li, Karthik Murugiah, Jing Li, Frederick A. Masoudi, Paul S. Chan, Shuang Hu, John A. Spertus, Yongfei Wang, Nicholas S. Downing, Harlan M. Krumholz, Lixin Jiang, for the China PEACE Collaborative Group

Abstract Background—In response to urban–rural disparities in healthcare resources, China recently launched a healthcare reform with a focus on improving rural care during the past decade. However, nationally representative studies comparing medical care and patient outcomes between urban and rural areas in China during this period are not available. Methods and Results—We created a nationally representative sample of patients in China admitted for ST-segment–elevation myocardial infarction in 2001, 2006, and 2011, using a 2-stage random sampling design in 2 urban and 3 rural strata. In China, evidence-based treatments were provided less often in 2001 in rural hospitals, which had lower volume and less availability of advanced cardiac facilities. However, these differences diminished by 2011 for reperfusion therapy (54% in urban versus 57% in rural; P=0.1) and reversed for angiotensin-converting enzyme inhibitors/angiotensin receptor blockers (66% versus 68%; P=0.04) and early β-blockers (56% versus 60%; P=0.01). The risk-adjusted rate of in-hospital death or withdrawal from treatment was not significantly different between urban and rural hospitals in any study year, with an adjusted odds ratio of 1.13 (0.77–1.65) in 2001, 0.99 (0.77–1.27) in 2006, and 0.94 (0.74–1.19) in 2011. Conclusions—Although urban–rural disparities in evidence-based treatment for myocardial infarction in China have largely been eliminated, substantial gaps in quality of care persist in both settings. In addition, urban hospitals providing more resource-intensive care did not achieve better outcomes.

Figure 1. The 2-stage random sampling process in China PEACE (Patient-centered Evaluative Assessment of Cardiac Events), and the selection of the cohort for the present study. NSTEMI indicates non–ST-segment–elevation myocardial infarction; and STEMI, ST-segment–elevation myocardial infarction. *1564 cases were considered as non-acute myocardial infarction (AMI) because the duration from symptom onset to admission was >30 d.

Table 1. Characteristics of Urban and Rural Hospitals

Table 2. Characteristics of Patients With ST-Segment–Elevation Myocardial Infarction CABG indicates coronary artery bypass grafting; CI, confidence interval; eGFR, estimated glomerular filtration rate; GRACE, Global Registry of Acute Coronary Events; OR, odds ratio; and PCI, percutaneous coronary intervention. *Category variables displayed as number (weighed percentage). †With patients in rural hospital as the reference group. ‡Median (interquartile range). §Excluding patients who were transferred in. ¶Among patients with the measurement.

Table 2. Continued CABG indicates coronary artery bypass grafting; CI, confidence interval; eGFR, estimated glomerular filtration rate; GRACE, Global Registry of Acute Coronary Events; OR, odds ratio; and PCI, percutaneous coronary intervention. *Category variables displayed as number (weighed percentage). †With patients in rural hospital as the reference group. ‡Median (interquartile range). §Excluding patients who were transferred in. ¶Among patients with the measurement.

Table 3. Changes in Treatments, Tests, and Procedure Use Among Patients With ST-Segment–Elevation Myocardial Infarction ACE indicates angiotensin-converting enzyme; CABG, coronary artery bypass graft; CI, confidence interval; OR, odds ratio; PCI, percutaneous coronary intervention; and TCM, traditional Chinese medicine. *Category variables displayed as weighed percentage. †With patients in rural hospital as the reference group. ‡Use of treatment among ideal patients. §Median (interquartile range).

Figure 2. Differences in risk-adjusted rates of in-hospital outcomes between rural and urban hospitals over time. A, In-hospital death or treatment withdrawal. B, In-hospital complications. The covariates included (1) demographic characteristics (age and sex); (2) medical history and risk factors (history of coronary heart disease, myocardial infarction, diabetes mellitus, hypertension, dyslipidemia, and stroke, as well as currently smoking); and (3) clinical features (chest discomfort for >10 min, duration from symptom onset to admission, as well as blood pressure, heart rate, acute stroke, and cardiac arrest at admission). The confidence intervals for risk-adjusted rates were calculated based on the standard error of proportion (the square root of P [1−P]/n).

Conclusion Our study demonstrates narrowing treatment gaps and similar patient outcomes after STEMI in urban and rural hospitals in China between 2001 and 2011. Although urban–rural disparities in evidence-based treatment for myocardial infarction in China have largely been eliminated, substantial gaps in quality of care persist in both settings. In addition, urban hospitals providing more resource-intensive care did not achieve better outcomes. This not only underscores encouraging trends for achieving more equitable care but also highlights substantial opportunities to improve the quality and value of care in both settings. To achieve exemplary performance and optimal outcomes, investments to improve capacity and access to care must be accompanied with the implementation of systematic quality measurements and incentive strategies.