Objective To explore the correlation of lung function

24-hour dynamic electrocardiogram and disease prognostic value in patients with pulmonary heart disease. Methods Eighty cases of patients with pulmonary heart disease were admitted to the hospital from May 2018 to May 2020.Patients were grouped according to the prognosis after 4 weeks in the study group（42 and 38 with poor prognosis）

and differences in lung function and ECG indicators were compared between the two groups

and correlation analysis was conducted.Results There were significant differences between the good and poor prognosis groups

FEV1

FEV1.0%

PEF

MMEF

RAL

Tei index

ST elevation

LAD

LVDd

LVEF

ST elevation

low frequency

high frequency and pNN50

SDNN

SDANN（p<0.05）

Spearman correlation showed a significant positive correlation between RAL

Tei index

LAD

LVDd and FEV1

FEV1.0%

FEV1/FVC

PEF

MMEF in patients with pulmonary heart disease

LVEF showed a significant negative correlation with FEV1

FEV1.0%（p<0.05）

and no correlation for the other indicators（p >0.05）;There is no correlation between ST-segment depression amplitude and RAL and LAD in patients with cor pulmonale; LVEF is not correlated with low frequency

high frequency

pNN50

SDNN

RMSSD（p >0.05）

LVEF is significantly negatively correlated with SDAN（p <0.05）

the rest All indicators were significantly positively correlated（p <0.05）; there was no correlation between the ST-segment depression amplitude and FEV1 and FEV1.0% in patients with cor pulmonale; there was no correlation between the ST-segment elevation amplitude and FEV1.0%（p>0.05）. The other indicators were significantly positively correlated（p<0.05）. Conclusions There is a certain correlation between the pulmonary function and 24 h ECG indicators in patients with cor pulmonale

which has prognostic value.