ObjectiveTo investigate the practical value of non-invasive positive pressure ventilation (NIPPV) in the treatment of acute left heart failure(ALHF).MethodsThe clinical effects and complications of NIPPV performed on 36 cases with severe ALHF on the basis of conventional treatment were evaluated and compared with previous treatment without NIPPV.ResultsOf 36 cases with ALHF treated by NIPPV,30 cases improved,6 cases were altered to receive invasive ventilation or dead.Total effective rate was 83.3%.Compared with 42 cases with severe ALHF treated only by conventional treatment in the past 5 years,with only 26 cases being successfully salvaged and effective rate being 61.9%,significant difference (P