Explore the effectiveness and safety of tailored hydration guided by lung water index monitor system for prevention of acute kidney injury after percutaneous coronary intervention for elderly patients with renal insufficiency.
Age ≥ 60 years;
Patients with unstable angina pectoris are scheduled for percutaneous coronary intervention；
Patients with chronic renal disease (estimated glomerular filtration rate < 90 ml/min);
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1. Acute decompensated severe heart failure or cardiogenic shock;
2. Malignant tumors, severe renal failure (estimated glomerular filtration rate < 30 ml/min);
3. Respiratory failure;
4. Used contrast media within one week;