Table 1
Baseline characteristics between normal and Lower calcium group.
| VARIABLES | PATIENTS WITH DCM (N = 1089) | p-VALUE | |
|---|---|---|---|
| NORMAL CALCIUM | LOWER CALCIUM | ||
| (n = 943) | (n = 146) | ||
| Demographic | |||
| Age, y | 68.12 ± 6.15 | 69.94 ± 7.08 | 0.005 |
| Male, n(%) | 601(63.7) | 111(76.0) | 0.004 |
| Medical History | |||
| Smoking history, n(%) | 244(25.9) | 45(30.8) | 0.208 |
| Hypertension, n(%) | 309(32.8) | 44(30.1) | 0.527 |
| Diabetes, n(%) | 228(24.2) | 34(23.3) | 0.815 |
| Parameters and medications | |||
| Serum chloride, mmol/L | 103.27 ± 5.03 | 101.41 ± 6.54 | 0.001 |
| Serum sodium, mmol/L | 138.24 ± 3.75 | 136.76 ± 12.46 | 0.090 |
| Serum potassium, mmol/L | 3.8 ± 0.51 | 3.76 ± 0.75 | 0.562 |
| WBC count, 109/L | 7.5 ± 2.82 | 7.51 ± 2.68 | 0.967 |
| Neutrophil count, 109/L | 5.03 ± 2.57 | 4.96 ± 2.59 | 0.429 |
| Lymphocyte count, 109/L | 1.64 ± 1.16 | 1.67 ± 0.68 | 0.453 |
| Hemoglobin, g/L | 131.14 ± 18.88 | 131.92 ± 17.93 | 0.641 |
| Glucose, mmol/L | 6.83 ± 2.99 | 7.00 ± 3.14 | 0.496 |
| CREA, umol/L | 107.18 ± 67.58 | 145.76 ± 103.08 | <0.001 |
| Uric, umol/L | 501.68 ± 169.75 | 519.53 ± 236.16 | 0.447 |
| CHOL, mmol/L | 4.43 ± 1.08 | 3.90 ± 1.09 | <0.001 |
| LDL-C, mmol/L | 2.79 ± 0.85 | 2.41 ± 0.88 | <0.001 |
| HDL-C, mmol/L | 1.05 ± 0.30 | 0.89 ± 0.35 | <0.001 |
| TBIL, umol/L | 21.60 ± 15.70 | 28.7 ± 47.69 | 0.002 |
| LVEF, % | 38.58 ± 16.12 | 36.70 ± 17.56 | 0.235 |
| Diuretics use, n(%) | 850(90.1) | 129(88.4) | 0.506 |
| Digoxin use, n(%) | 436(46.2) | 80(54.8) | 0.054 |
| Clinical outcomes | |||
| In-hospital mortality, n(%) | 28(3.0) | 17(11.6) | <0.001 |
| Long-term mortality, n(%) | 371(41.7) | 90(72.0) | <0.001 |
[i] Abbreviations: DCM: dilated cardiomyopathy; WBC: white blood cell; CREA: creatinine; CHOL: total cholesterol; LDL-C: low density lipoprotein cholesterol; HDL-C: high density lipoprotein cholesterol; TBIL: total bilirubin; LVEF: left ventricle ejection fraction.
Table 2
Logistic regression analyses for in-hospital mortality.
| VARIABLES | UNIVARIATE ANALYSIS | MULTIVARIATE ANALYSIS | ||
|---|---|---|---|---|
| OR | p-VALUE | OR | p-VALUE | |
| Serum calcium | 0.204 (0.121~0.345) | <0.001 | 0.340 (0.160~0.720) | 0.005 |
| Age | 1.048 (1.003~1.095) | 0.038 | 0.980 (0.922~1.042) | 0.525 |
| Males | 1.478 (0.754~2.897) | 0.255 | ||
| Smoke | 1.263 (0.662~2.409) | 0.479 | ||
| Hypertension | 0.509 (0.242~1.068) | 0.074 | ||
| Diabetes | 0.782 (0.371~1.645) | 0.516 | ||
| Serum creatinine | 1.009 (1.006~1.012) | <0.001 | 1.005 (1.002~1.009) | 0.002 |
| CHOL | 0.772 (0.563~1.058) | 0.107 | ||
| Hemoglobin | 1.006 (0.989~1.022) | 0.508 | ||
| Albumin | 0.862 (0.811~0.915) | <0.001 | 1.016 (0.925~1.116) | 0.747 |
| lg NT-proBNP | 18.632 (7.950~43.669) | <0.001 | 5.618 (2.082~15.161) | 0.001 |
| LVEF | 0.977 (0.962~0.993) | 0.004 | 0.989 (0.970~1.009) | 0.282 |
| Usage of diuretics | 0.719 (0.297~1.739) | 0.464 | ||
[i] Abbreviations: OR: odds ratio; CHOL: total cholesterol; NT-proBNP: N-terminal B-type natriuretic peptide; LVEF: left ventricle ejection fraction.

Figure 1
ROC curve of serum calcium in predicting in-hospital mortality.

Figure 2
Kaplan-Meier survival curves according to the optimal cutoff value of serum calcium.
Table 3
Multivariate Cox proportional hazard regression models for long-term mortality.
| CLINICAL VARIABLES | HR | 95% CI | p-VALUE |
|---|---|---|---|
| Model 1 | |||
| Serum calcium, mg/dL | 0.708 | 0.557~0.901 | 0.005 |
| Age, years | 1.038 | 1.019~1.056 | <0.001 |
| Serum creatinine, umol/L | 1.004 | 1.002~1.005 | <0.001 |
| Albumin, g/L | 1.005 | 0.977~1.034 | 0.708 |
| lgNT-proBNP | 1.362 | 1.075~1.725 | 0.010 |
| LVEF, % | 0.977 | 0.965~0.989 | <0.001 |
| Model 2 | |||
| Serum calcium ≤ 8.62 mg/dL | 1.449 | 1.115~1.882 | 0.005 |
| Age, years | 1.038 | 1.02~1.056 | <0.001 |
| Serum creatinine, umol/L | 1.004 | 1.003~1.005 | <0.001 |
| Albumin, g/L | 1.003 | 0.976~1.03 | 0.853 |
| lgNT-proBNP | 1.333 | 1.053~1.689 | 0.017 |
| LVEF, % | 0.975 | 0.963~0.987 | <0.001 |
[i] Abbreviations: HR: hazard ratio; CI: confidence interval; LVEF: left ventricular ejection fraction.
