Understanding Readmissions in Medicare Beneficiaries During the 90-Day Follow-Up Period of an Acute Myocardial Infarction Admission.

Background Medicare has a voluntary episodic payment model for Medicare beneficiaries that bundles payment for the index acute myocardial infarction (AMI) hospitalization and all post-discharge services for a 90-day follow-up period. The purpose of this study is to report on the types and frequency of readmissions and identify demographic and clinical factors associated with readmission of Medicare beneficiaries that survived their AMI hospitalization. Methods and Results This retrospective study used the Inpatient Standard Analytical File for 2014. There were 143 286 Medicare beneficiaries with AMI who were discharged alive from 3619 hospitals. All readmissions occurring in any hospital within 90 days of the index AMI discharge date were identified. Of 143 286 Medicare beneficiaries discharged alive from their index AMI hospitalization, 28% (40 145) experienced at least 1 readmission within 90 days and 8% (11 477) had >1 readmission. Readmission rates were higher among Medicare beneficiaries who did not undergo a percutaneous coronary intervention in their index AMI admission (34%) compared with those that underwent a percutaneous coronary intervention (20.2%). Using all Medicare beneficiary's index AMI, 27 comorbid conditions were significantly associated with the likelihood of a Medicare beneficiary having a readmission during the follow-up period. The strongest clinical characteristics associated with readmissions were dialysis dependence, type 1 diabetes mellitus, and heart failure. Conclusions This study provides benchmark information on the types of hospital readmissions Medicare beneficiaries experience during a 90-day AMI bundle. This paper also suggests that interventions are needed to alleviate the need for readmissions in high-risk populations, such as, those managed medically and those at risk of heart failure.

Impact of Complications on Resource Utilization During 90-Day Coronary Artery Bypass Graft Bundle for Medicare Beneficiaries.

BACKGROUND: The study reports the impact of adverse events during the index coronary artery bypass graft surgery (CABG) on Medicare reimbursement for the index hospitalization and a 90-day follow-up period. METHODS: This retrospective study used 2014 Medicare claims files for hospitals, skilled nursing services, rehabilitation facilities, long-term care facilities, home health services, and outpatient visits. The study sample is 37,106 Medicare beneficiaries that survived an index CABG in a US hospital during the first three quarters of 2014. Adverse events included acute renal failure, new onset hemodialysis, postoperative respiratory failure, any infection (postoperative infection, or sepsis), postoperative shock and hemorrhage, postoperative stroke, and reoperation during index hospitalization. RESULTS: Total average Medicare reimbursement for all services consumed during index CABG hospitalization and the 90-day postdischarge period was $42,063 ± $23,284. The index CABG hospitalization accounted for $32,544 ± $14,406, 77.4% of the bundle. Medicare beneficiaries having at least one adverse event had significantly higher total average Medicare reimbursement by $15,941 ($54,280 versus $38,339) for the bundle compared with Medicare beneficiaries not having an adverse event. The risk-adjusted incremental Medicare reimbursement for the entire 90-day bundle exceeded $20,000 for four adverse events: new-onset hemodialysis, $33,250; septicemia, $32,063; postoperative stroke, $24,117; and postoperative infection, $23,801. CONCLUSIONS: Medicare beneficiaries who have adverse events during their index CABG hospitalization will significantly affect that hospital's financial risk. The challenge under the voluntary CABG bundled payment program will be to monitor and reduce adverse events and manage the services consumed by Medicare beneficiaries having adverse events delivered at all the venues of care.

Trends in Aortic Valve Replacement Procedures Between 2009 and 2015: Has Transcatheter Aortic Valve Replacement Made a Difference?

BACKGROUND: This study reports trends in volume and adverse events associated with isolated aortic valve procedures performed in Medicare beneficiaries between 2009 and 2015. METHODS: This retrospective study used the annual fiscal year Medicare Provider Analysis and Review file to identify all Medicare beneficiaries undergoing an isolated aortic valve procedure. Outcome measures included three mortality rates and nine in-hospital adverse events. The final study population consisted of 233,660 hospitalizations. RESULTS: During the study period, Medicare beneficiaries undergoing an aortic valve procedure increased from 22,076 to 49,362, for an average annual growth rate of 14.45%. Transcatheter aortic valve replacement (TAVR) procedures per 100,000 Medicare beneficiaries grew from 10.7 in 2012 to 41.1 in 2015. Overall, in-hospital mortality rates, cumulative 30-day mortality rates, and 90-day postdischarge mortality rates declined annually during the study period. However, the 90-day mortality rate for TAVR was nearly double the rate for the tissue surgical aortic valve replacement group. Nearly 68% of Medicare beneficiaries experienced at least one in-hospital adverse event during their index hospitalization. Medicare beneficiaries undergoing TAVR had the lowest observed adverse events rates among the aortic valve procedures in 2015. CONCLUSIONS: The total number of Medicare beneficiaries undergoing isolated aortic valve procedures increased from 47.5 to 88.9 per 100,000 Medicare beneficiaries during the study period. Aortic valve procedures increased significantly during this study period primarily due to the increase in TAVR, with clinical outcomes improving as well. Although long-term outcomes of TAVR are still under investigation, these results are promising.

Trends in coronary revascularization procedures among Medicare beneficiaries between 2008 and 2012.

BACKGROUND: This study reports on the trends in the volume and outcomes of coronary revascularization procedures performed on Medicare beneficiaries between 2008 and 2012. METHODS AND RESULTS: This retrospective study identifies all Medicare beneficiaries undergoing a coronary revascularization procedure: coronary artery bypass graft surgery or percutaneous coronary intervention (PCI) performed in either the nonadmission or inpatient setting. International Classification of Diseases, 9th Revision, Clinical Modification procedure codes (inpatient setting) and Current Procedural Terminology and Ambulatory Payment Classification codes (nonadmission) were used to identify revascularizations. The study population consists of 2,768,007 records. This study finds that the rapid growth in nonadmission PCIs performed on Medicare beneficiaries (60,405-106,495) has been more than offset by the decrease in PCI admissions (363,384-295,434) during the study period. There also were >18,000 fewer coronary artery bypass graft admissions in 2012 than in 2008. This study finds lower observed mortality rates (3.7%-3.2%) among Medicare beneficiaries undergoing any coronary artery bypass graft surgery and higher observed mortality rates (1.7%-1.9%) for Medicare beneficiaries undergoing any PCI encounter. This study also finds a growth in the number of facilities performing revascularization procedures during the study period: 268 (20.2%) more sites were performing nonadmission PCIs; 136 (8.2%) more sites were performing inpatient PCIs; and 19 (1.6%) more sites were performing coronary artery bypass graft surgery. CONCLUSIONS: The total number of revascularization procedures performed on Medicare beneficiaries peaked in 2010 and declined by >4% per year in 2011 and 2012. Observed mortality rates among all Medicare beneficiaries undergoing any coronary revascularization remained between 2.1% and 2.2% annually during the study period.

Predicting the restenosis benefit of drug-eluting versus bare metal stents in percutaneous coronary intervention.

BACKGROUND: Drug-eluting stents (DES) for percutaneous coronary intervention decrease the risk of restenosis compared with bare metal stents. However, they are costlier, require prolonged dual antiplatelet therapy, and provide the most benefit in patients at highest risk for restenosis. To assist physicians in targeting DES use in patients at the highest risk for target vessel revascularization (TVR), we developed and validated a model to predict TVR. METHODS AND RESULTS: Preprocedural clinical and angiographic data from 27 107 percutaneous coronary intervention hospitalizations between October 1, 2004, and September 30, 2007, in Massachusetts were used to develop prediction models for TVR at 1 year. Models were developed from a two-thirds random sample and validated in the remaining third. The overall rate of TVR was 7.6% (6.7% with DES, 11% with bare metal stents). Significant predictors of TVR included prior percutaneous coronary intervention, emergency or salvage percutaneous coronary intervention, prior coronary bypass surgery, peripheral vascular disease, diabetes mellitus, and angiographic characteristics. The model was superior to a 3-variable model of diabetes mellitus, stent diameter, and stent length (c statistic, 0.66 versus 0.60; P<0.001) and was well calibrated. The predicted number needed to treat with DES to prevent 1 TVR compared with bare metal stents ranged from 6 (95% confidence interval, 5.4-7.6) to 80 (95% confidence interval, 62.7-116.3), depending on patients' clinical and angiographic factors. CONCLUSIONS: A predictive model using commonly collected variables can identify patients who may derive the greatest benefit in TVR reduction from DES. Whether use of the model improves the safety and cost-effectiveness of DES use should be tested prospectively.

Sex differences in hospital risk-adjusted mortality rates for Medicare beneficiaries undergoing CABG surgery.

BACKGROUND: The primary purpose of this study was to rank US hospitals performing coronary artery bypass graft (CABG) surgery on Medicare beneficiaries into 4 performance tiers and determine if there were overall and sex-specific differences in the risk-adjusted mortality rates across performance tiers. METHODS: A retrospective analysis was done using a Medicare Provider Analysis and Review (MEDPAR) file of all Medicare beneficiaries who underwent CABG surgery without valve repair or replacement during fiscal years 2003 and 2004. Logistic regression models controlling for demographic characteristics, comorbidities, and cardiac risk factors were used to predict the probability of in-hospital mortality. Hospitals performing at least 52 CABG surgeries during a fiscal year (at least 17 female patients) were ranked into 4 tiers. Rankings were based on the number of lives saved, calculated as the expected number of risk-adjusted deaths minus the actual number of deaths in the hospital during each fiscal year. RESULTS: Average risk-adjusted mortality rate was stable and declining over the 2 years: 3.68% in 2003 and 3.61% in 2004. In 2004, the average risk-adjusted mortality rate ranged from 1.39% in tier 1 hospitals to 6.40% in tier 4 hospitals. The sex-specific mortality rate was consistently higher for women in all tiers, with the differential smallest (0.68%) in tier 1 hospitals and greatest (2.67%) in tier 4 hospitals. CONCLUSION: The sex differential increases from top- to bottom-tier hospitals, suggesting female beneficiaries could benefit from having CABG performed at tier 1 hospitals.

The frequency and cost of complications associated with coronary artery bypass grafting surgery: results from the United States Medicare program.

BACKGROUND: We estimate the incremental hospital resource consumption associated with treating selected complications experienced by Medicare beneficiaries undergoing coronary artery bypass grafting (CABG). METHODS: This retrospective study, using the Medicare Provider Analysis and Review file, identified 114,233 Medicare beneficiaries who survived CABG without concomitant valve repair during a hospitalization for fiscal year 2005. The frequencies of seven complications were determined: hemorrhage or postoperative shock, reoperation, postoperative adult respiratory distress syndrome, new-onset hemodialysis, postoperative stroke, postoperative infection and septicemia. The observed and adjusted incremental hospital resources consumed (cost and length-of-stay) in treating beneficiaries experiencing each of the selected complications were estimated. RESULTS: The mean cost of a hospitalization associated with a CABG procedure among Medicare beneficiaries was $32,201 +/- $23,059, and the mean length of stay was 9.9 +/- 7.8 days. After adjusting for patient demographics and comorbid conditions, the 13.64% of Medicare beneficiaries experiencing any of the study complications consumed significantly more hospital resources (incremental cost, $15,468) and had a longer length of stay (incremental stay, 5.3 days). CONCLUSIONS: Despite ongoing improvements in outcomes, major complications remain common after bypass grafting and add substantially to hospital costs for these procedures. These findings suggest that the potential cost savings of redirecting resources currently spent on treating complications will help make the "business case" for investing in patient safety initiatives and best practices guidelines shown to reduce selected complications.

Cardiovascular centers of excellence program: a system approach for improving the care and outcomes of cardiovascular patients at HCA hospitals.

BACKGROUND: A voluntary continuous quality improvement (CQI) effort, the cardiovascular Centers of Excellence (COE) program was implemented by HCA, Inc., to improve cardiovascular care in its hospital system. METHODS: The cardiovascular COE program targeted 165 hospitals that provide cardiovascular services in at least one major service area. Awards (unrestricted grants) provided hospitals with an incentive to participate. RESULTS: One hundred fifty-eight hospitals (95.8%) completed the entire 2005 cardiovascular COE program; five were identified as cardiovascular COE. The program developed three key CQI activities: (1) an ongoing Web-based survey to inventory, track, and verify evidence-based practices across all aspects of patient care, including clinical practices, leadership, communications, patient safety, and patient education; (2) quarterly benchmark reports tracking risk-adjusted outcomes and evidence-based practices; and (3) regularly scheduled educational programs presented by an interdisciplinary team in which lessons learned from an institution's successful, evidence-based, best-practice implementation were discussed. DISCUSSION: The COE program successfully encouraged facilities to proacrively investigate their evidence-based clinical standards and outcomes.

Active Lipid Management In Coronary Artery Disease (ALMICAD) study.

PURPOSE: Many providers have implemented specialized lipid clinics to more effectively identify, monitor, and treat hyperlipidemia in patients with coronary artery disease. The effectiveness of such a strategy is not known. We sought to investigate whether a specialized clinic achieves better lipid results and clinical outcomes than standard care. SUBJECTS AND METHODS: A total of 1233 patients who had coronary disease documented by coronary angiography were randomized to lipid clinic or standard care groups by their providers and followed for 2 years. The primary end point was a composite of death, myocardial infarction, repeat revascularization, and stroke. RESULTS: Lipid clinic (n=617) and standard care (n=616) groups had no significant baseline differences. After 2 years, the lipid clinic group had similar total cholesterol (166+/-42 mg/dL vs 166+/-41 mg/dL, P=.83), low-density lipoprotein cholesterol levels (84+/-32 vs 85+/-32, P=.28), and percentage of patients with low-density lipoprotein cholesterol less than 100 mg/dL (77.5% vs 77.6%, P=.97). There were no significant differences in the primary end point (12.3% vs 11.4%, P=.60) and mortality (7.6% vs 7.3%, P=.80) between the lipid clinic and standard care groups. CONCLUSIONS: In patients identified by diagnostic coronary angiography and managed within a single health care system, implementation of a specialized lipid clinic did not achieve greater attainment of hyperlipidemia treatment goals or improved cardiac outcomes.

The frequency and incremental cost of major complications among medicare beneficiaries receiving implantable cardioverter-defibrillators.

OBJECTIVES: We aimed to quantify the frequency and nature of early complications after implantable cardioverter-defibrillator (ICD) implantation in general practice, and estimate the incremental costs of those complications to the health care system. BACKGROUND: Cardioverter-defibrillator implantation rates are rising quickly. Little has been published regarding the outcomes and costs of these procedures in unselected populations. METHODS: Using Medicare Provider Analysis and Review (MedPAR) files, we identified 30,984 admissions containing procedure codes for new ICD or cardiac resynchronization therapy defibrillator implantation in fiscal year 2003. The frequencies of eight complicating diagnoses during these admissions were determined. Length of stay (LOS) and total hospital costs, derived using whole-hospital cost to charge ratios, were calculated for each admission. The incremental effects of any and each complication on LOS and hospital cost were estimated in multivariable models, adjusting for demographic factors and comorbid conditions. RESULTS: The mean cost for all admissions was 42,184 dollars (median 37,902 dollars) with mean LOS of 4.7 days (median 2.0 days). One or more complications were coded in 10.8% of admissions, most commonly "mechanical complication of the ICD" and hemorrhage/hematoma. The occurrence of any complication increased adjusted LOS by 3.4 days and costs by 7,251 dollars. Each of the individual complications was associated with highly significant increases in both LOS (1 to 10 days) and hospital cost (5,000 dollars to 20,000 dollars). CONCLUSIONS: In fiscal 2003, 10.8% of Medicare patients undergoing cardioverter-defibrillator implantation experienced one or more early complications, associated with significant increases in LOS and costs. Efforts to reduce these complications could have significant clinical and financial benefits.

Hospital resources consumed in treating complications associated with percutaneous coronary interventions.

Nearly 9.5% of all Medicare beneficiaries who undergo a percutaneous coronary intervention (PCI) procedure develop > or =1 of 7 acute complications. This study used 2 approaches (regression analysis and propensity-matched samples) to estimate the cost of selected complications, based on administrative data from 335,477 Medicare beneficiaries who underwent PCI during a hospitalization in fiscal year 2002. Selected complications included hospital mortality, emergency/urgent coronary artery bypass surgery, postoperative stroke, acute renal failure, vascular complications, septicemia, and adult respiratory distress syndrome. The observed average cost of a PCI hospitalization for patients who did not develop complications was 13,861 dollars +/- 9,635 dollars, with an average length of stay of 3.0 +/- 3.2 days, compared with 26,807 dollars +/- 27,596 dollars and 8.0 +/- 8.9 days for patients who did develop complications. Estimates of the adjusted incremental hospital cost of treating any acute complication except death varied from a high of 33,030 dollars for patients who developed septicemia to a low of 4,278 dollars for those who developed vascular complications, whereas estimates of the incremental length of stay ranged from a high of 12.3 days for patients who had septicemia to a low of 1.8 days for patients who had vascular complications. In conclusion, we found that the incremental hospital resources that are consumed to treat patients with acute PCI complications are large compared with the cost of an uncomplicated PCI hospitalization.

Early invasive strategy improves outcomes in patients with acute coronary syndrome with previous coronary artery bypass graft surgery: a report from TACTICS-TIMI 18.

BACKGROUND: Patients with previous coronary artery bypass graft surgery (CABG) have been classified as a high-risk subset of patients who experience non-ST elevation acute coronary syndrome (ACS). Recent studies suggest that an early invasive strategy is beneficial in moderate- and high-risk patients with non-ST elevation ACS. We hypothesized that an early invasive strategy is associated with improved outcomes in patients with non-ST elevation ACS with prior CABG. METHODS AND RESULTS: In the Treat Angina with Aggrastat and determine Cost of Therapy with an Invasive or Conservative Strategy-Thrombolysis in Myocardial Infarction 18 trial (TACTICS-TIMI 18), 2220 patients with non-ST segment elevation ACS were randomized to an early invasive or conservative (selectively invasive) strategy. All patients were treated with aspirin, heparin, and tirofiban. Four hundred eighty-four (22%) of these patients had undergone CABG before enrollment. We analyzed whether patients with previous CABG had different 6-month outcomes and whether an early invasive strategy was associated with an improvement in long-term outcomes. Prior CABG was associated with a higher risk of adverse outcomes by 6 months, including a higher rate of readmission for ACS (17.4% vs 11.0%, P < 0.001) and a higher incidence of the composite end point of death, myocardial infarction, or rehospitalization for ACS (22.3% vs 16.4%, P = 0.002). There was a trend toward a higher incidence of myocardial infarction (7.1% vs 5.3%, P = 0.051). An early invasive strategy was associated with a reduction in the composite of death or myocardial infarction (odds ratio [OR], 0.58; 95% confidence interval [CI], 0.31-1.0; P = 0.089) and a significant reduction in the incidence of myocardial infarction at 6 months (OR, 0.44; 95% CI, 0.21-0.93; P=0.032). CONCLUSIONS: Patients with non-ST segment elevation ACS who have had previous CABG are a high-risk subset. An early invasive strategy reduces risk of myocardial infarction in this high-risk group.

Current status and outcomes of coronary revascularization 1999 to 2002: 148,396 surgical and percutaneous procedures.

BACKGROUND: Current practice, trends, and early outcomes in patients undergoing surgical and percutaneous coronary interventions (PCI) are changing and subject to speculation. METHODS: 148,396 consecutive patients in 69 HCA, Inc hospitals who underwent either PCI or coronary artery bypass grafting (CABG) were tracked in the HCA Casemix Database from 1999 through the first quarter of 2002. Comorbid conditions, procedures, complications, and outcome variables were defined through International Classification of Diseases, Ninth Revision coding. Odds ratios (OR) for death and other procedure-related complications were estimated using logistic regression adjusting for age, sex, and 31 other patient clinical and procedural characteristics. RESULTS: Now 65.4% of all coronary revascularization is by PCI with a 6.8% annual rate of increase whereas CABG volume is declining by 1.9% per year. However the majority of these changes occurred between 1999 and 2000 with only small changes in the last 3 years. Coronary artery bypass grafting is still utilized primarily for multivessel disease (3.38 bypasses per patient) whereas PCI is predominately (83%) still limited to single-vessel intervention. Unadjusted mortality rates over the full 13-quarter period were 1.25% for PCI and 2.63% for CABG (p < 0.001), with PCI rates remaining constant and CABG mortality declining. Twenty-three percent of CABG is performed off pump with a lower mortality than conventional on-pump CABG (2.37% versus 2.69%, p < 0.001). Percutaneous coronary intervention patients have lower mortality (OR 0.51), and fewer acute renal failure (OR 0.39), neurologic (OR 0.12), and cardiac (OR 0.16) complications than CABG patients (p < 0.001). CONCLUSIONS: Interventions for coronary artery disease continue to rise primarily due to an increase in PCI. The volume of PCI continues to increase relative to CABG. Although adverse outcomes are higher after CABG, the proportion of multivessel disease treated is greater. The difference in adverse outcomes between CABG and PCI remains small and continues to decline.

The influence of diabetes mellitus on the practice and outcomes of percutaneous coronary intervention in the community: a report from the HCA database.

BACKGROUND: Diabetics remain a high-risk group for those undergoing percutaneous coronary intervention (PCI) using balloon angioplasty and/or intracoronary stents for myocardial revascularization. The objective of this study is to compare clinical characteristics, demographics, procedure indications, lesion characteristics, and acute and long-term outcomes between diabetic patients and non-diabetic patients in a community based PCI registry. METHODS AND RESULTS: Information on patient demographics, coronary risk factors, lesion characteristics, procedures, and outcomes were derived from an HCA, Inc. database on all patients undergoing a PCI procedure in one of four community cardiac catheterization laboratories (CCL). A total of 3,139 patients who underwent PCI procedures from July 1, 1999 through September 30, 2000 were enrolled in this study. Approximately one-third of these patients completed a follow-up survey one year after their initial encounter. Analysis was limited to those patients undergoing PCI of native vessels with stents or conventional balloon angioplasty; patients with target lesions in bypass grafts or those treated with atherectomy were excluded. Approximately 23.5% of the patients enrolled in the study were diabetic. This study found no significant difference in any acute outcome between diabetic and non-diabetic patients in the hospital episode associated with the index PCI procedure. However, data from the 1-year follow-up survey indicates diabetic patients tended to have more target lesion revascularization (TLR) (13.6% versus 8.9%; p = 0.07) and more target vessel revascularization (TVR) (17.6% versus 12.7%; p = 0.058) than non-diabetic patients. In addition, adjusted odds ratios indicate that diabetic patients were 1.6 times more likely to have a second PCI procedure in another vessel (p = 0.013), 2.4 times more likely to undergo bypass surgery (p = 0.003), 1.9 times more likely to undergo an additional revascularization procedure (p < 0.001) and 1.8 times more likely to experience any major adverse cardiac events (p < 0.001) than non-diabetic patients during the follow-up period. CONCLUSIONS: This study indicates that selected diabetic patients can be treated for myocardial revascularization using PCI procedures with acceptable acute outcomes. However, diabetic patients undergoing PCIs have significantly more disease progression and are more likely to experience the need for recurrent revascularization.