The 11 variable PE severity index (PESI) score accurately predicts the 30 day risk of death, but can be cumbersome to use. This study derived and validated a simpler 6 variable score, based on age, cancer, chronic pulmonary disease, heart rate, blood pressure, and oxygen saturation, which performed just as well as the 11 variable score. This simplified score is easier to use and has the same predictive value as the 11 variable score (abstract)
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