Pneumonia severity index

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The pneumonia severity index (PSI) or PORT Score is a clinical prediction rule that medical practitioners can use to calculate the probability of morbidity and mortality among patients with community acquired pneumonia. [1]

Contents

The PSI/PORT score is often used to predict the need for hospitalization in people with pneumonia. [2] This is consistent with the conclusions stated in the original report that published the PSI/PORT score: [1] "The prediction rule we describe accurately identifies the patients with community-acquired pneumonia who are at low risk for death and other adverse outcomes. This prediction rule may help physicians make more rational decisions about hospitalization for patients with pneumonia." [1]

Mortality prediction is similar to that when using CURB-65. [3]

Development

The rule uses demographics (whether someone is older, and is male or female), the coexistence of co-morbid illnesses, findings on physical examination and vital signs, and essential laboratory findings. This study demonstrated that patients could be stratified into five risk categories, Risk Classes I-V, and that these classes could be used to predict 30-day survival.

Usage

The purpose of the PSI is to classify the severity of a patient's pneumonia to determine the amount of resources to be allocated for care. Most commonly, the PSI scoring system has been used to decide whether patients with pneumonia can be treated as outpatients or as (hospitalized) inpatients.

  • be sent home with oral antibiotics [4]
  • be admitted for a short hospital stay with antibiotics and monitoring. [4]

Algorithm

The PSI Algorithm is detailed below. An online, automated PSI calculator was once available on the US AHRQ website for Personal Digital Assistants that are no longer sold. In 2018 AHRQ presented a new toolkit on the basis of CURB-65, an older counterpart to the PSI. [6] In the 2019 ATS/IDSA Guidelines for the Diagnosis and Treatment of Adults with Community-acquired Pneumonia, PSI was recommended over CURB-65 because of lack of evidence supporting the safety and effectiveness of the latter. [7]

Step 1: Stratify to Risk Class I vs. Risk Classes II-V
Presence of:
Over 50 years of age Yes/No
Altered mental status Yes/No
Pulse ≥125/minute Yes/No
Respiratory rate >30/minute Yes/No
Systolic blood pressure <90 mm Hg Yes/No
Temperature <35 °C or ≥40 °C Yes/No
History of:
Neoplastic disease Yes/No
Congestive heart failure Yes/No
Cerebrovascular disease Yes/No
Renal disease Yes/No
Liver disease Yes/No
If any "Yes", then proceed to Step 2
If all "No" then assign to Risk Class I
Step 2: Stratify to Risk Class II vs III vs IV vs V
DemographicsPoints Assigned
If Male +Age (yr)
If Female +Age (yr) − 10
Nursing home resident +10
Comorbidity
Neoplastic disease +30
Liver disease +20
Congestive heart failure +10
Cerebrovascular disease +10
Renal disease +10
Physical Exam Findings
Altered mental status +20
Pulse ≥125/minute +10
Respiratory rate >30/minute +20
Systolic blood pressure <90 mm Hg +20
Temperature <35 °C or ≥40 °C +15
Lab and Radiographic Findings
Arterial pH <7.35 +30
Blood urea nitrogen ≥30 mg/dl (9 mmol/liter) +20
Sodium <130 mmol/liter +20
Glucose ≥250 mg/dl (14 mmol/liter) +10
Hematocrit <30% +10
Partial pressure of arterial O2 <60mmHg +10
Pleural effusion +10
Σ <70 = Risk Class II
Σ 71-90 = Risk Class III
Σ 91-130 = Risk Class IV
Σ >130 = Risk Class V

Data source for derivation and validation

The rule was derived then validated with data from 38,000 patients from the MedisGroup Cohort Study for 1989, comprising 1 year of data from 257 hospitals across the US who used the MedisGroup patient outcome tracking software built and serviced by Mediqual Systems (Cardinal Health). One significant caveat to the data source was that patients who were discharged home or transferred from the MedisGroup hospitals could not be followed at the 30-day mark, and were therefore assumed to be "alive" at that time. Further validation was performed with the Pneumonia Patient Outcomes Research Team [PORT] (1991) cohort study. This categorization method has been replicated by others [8] and is comparable to the CURB-65 in predicting mortality. [8]

Derivation and validation data

Medisgroup Study (1989)PORT Validation Study (1991) Cohort
Derivation CohortValidation CohortInpatientsOutpatientsAll Patients
Risk Class no. of pts % died no. of pts % died no. of pts % died no. of pts % died no. of pts % died
I 1,3720.4 3,0340.1 1850.5 5870.0 7720.1
II (<70) 2,4120.7 5,7780.6 2330.9 2440.4 4770.6
III (71–90) 2,6322.8 6,7902.8 2541.2 720.0 3260.9
IV (91–130) 4,6978.5 13,1048.2 4469.0 4012.5 4869.3
V (>130) 3,08631.1 9,33329.2 22527.1 10.0 22627.0
Total 14,19910.2 38,03910.6 13438.0 9440.6 22875.2

Note: % Died refers to 30-day mortality.

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References

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