Table 2.
Unweighted frequencies of heart failure and cardiomyopathy diagnoses by various claims-based and chart-review algorithms among the chart sample, eligible cohort, and full cohort
| Outcome Algorithm | Chart-review patients (N=400) |
Chart-review eligible patients (N=6,460) |
All patients (N=13,472) |
|---|---|---|---|
| Virtual Data Warehouse (including claims-based data) | |||
| Algorithm #1: ≥1 primary discharge diagnosis of HF/CM | 43 (10.8%) | 108 (1.7%) | 199 (1.5%) |
| Algorithm #2: | |||
| ≥1 primary discharge OR | 43 (10.8%) | 108 (1.7%) | 199 (1.5%) |
| ≥3 secondary discharge OR | 6 (1.5%) | 20 (0.3%) | 31 (0.2%) |
| ≥2 outpatient OR | 72 (18.0%) | 206 (3.2%) | 383 (2.8%) |
| ≥3 ED OR | 0 | 0 | 2 (0.0%) |
| ≥2 secondary discharge + ≥1 outpatient diagnosis of HF/CM | 3 (0.8%) | 3 (0.1%) | 8 (0.1%) |
| Any of the above | 124 (31.0%) | 337 (5.2%) | 623 (4.6%) |
| Algorithm #3: Any ICD-9 code for HF/CM | 166 (41.5%) | N/A | N/A |
| Medical Charts | |||
| A) Clinician indication of HF/CM | 92 (23.0%) | N/A | N/A |
| B) LVEF <50% | 52 (13.0%) | N/A | N/A |
| C) Either A or B (gold standard) | 108 (27.0%) | N/A | N/A |