precordial leads of  

  routine 12-lead ECG. MethodsRetrospective analysis was performed on 131 patients examined by routine 12-lead ECG and  diagnosed with  low voltage

 in precordial leads  

  during hospitalization. We observed their clinical characteristics. Results

Among the 131 patients, there are 65 cases (49.62%) with 

 low voltage in all precordial leads, and 52 cases (39.69%) with 

 low voltage in all limb leads. Coronary heart disease complicated by cardiac insufficiency is the most common underlying disease (26 cases, 

 accounting for 

19.85%), followed by malignant tumor (23 cases, accounting for  17.56%) among which lung cancer accounts for the largest proportion (9 cases, accounting for 6.87%). A total of 45 cases (34.35%) are accompanied with anemia and 40 cases (30.53%) are complicated by hypoproteinemia. The average level of blood hemoglobin and blood albumin are both below the normal range. ConclusionCoronary heart disease complicating cardiac insufficiency is the most common underlying disease of patients with low QRS voltage in precordial leads of routine 12-lead ECG, and most of these patients have complications affecting QRS voltage.