NPPB and hydrops fetalis: The independent prediction factors associated with a 30-day mortality of elderly HF patients in ICU admission were heart rate [odds ratio (OR) = 1.38, 95% confidence interval (CI): 1.11–1.77, P < 0.01], SBP (OR = 0.64, 95% CI: 0.51–0.81, P < 0.01), temperature (OR = 0.89, 95% CI: 0.79–0.99, P < 0.01), SpO2 (OR = 0.74, 95% CI: 0.64–0.85, P < 0.01), 24h UOP (OR = 0.67, 95% CI: 0.54–0.82, P < 0.01), NT-proBNP (OR = 1.12, 95% CI: 1.00–1.24, P < 0.01), BUN (OR = 1.36, 95% CI: 1.16–1.60, P < 0.01), and serum calcium (OR = 0.73, 95% CI: 0.61–0.86, P < 0.01).