title: [Study of automated acid-base mapping on diagnose and treatment of community acquired pneumonia in emergency department].
abstract: OBJECTIVE
  To analyze the value of automated acid-base mapping on diagnose and treatment of patients with community acquired pneumonia (CAP) in emergency department.
  
  
  METHODS
  According to medical history, pulmonary function test, diagnosing guideline of chronic obstructive pulmonary disease (COPD), 111 patients with CAP were divided into two groups: single CAP group (n=56) and COPD complicated with CAP group [acute exacerbation of chronic obstructive pulmonary disease (AECOPD) group, n=55]. After enquiring medical history, arterial blood samples were drawn for blood gas analysis and automated acid-base mapping was analyzed.
  
  
  RESULTS
  Arterial blood gas analysis showed arterial carbon dioxide partial pressure (PaCO(2)), HCO(3)(-), base excess of AECOPD group were obviously higher than those in CAP group (PaCO(2): 7.714±2.414 kPa vs. 5.896±1.308 kPa, HCO(3)(-): 30.767±7.185 mmol/L vs. 25.014±3.043 mmol/L, BE: 4.345±5.371 mmol/L vs. -0.354±3.180 mmol/L, all P<0.01). Automated acid-base mapping showed acid-base disturbance of AECOPD group was 89.1% and CAP group was 66.1%. Chi-square analysis were done for patients of normal (10.9%, 33.9%), acute respiratory acidosis (12.7%, 14.3%), chronic respiratory acidosis (49.1%, 10.7%), respiratory alkalosis (7.3%, 14.3%), metabolic acidosis (12.7%, 17.9%), metabolic alkalosis (12.7%, 8.9%) between AECOPD group and CAP group, and statistical significance was found between AECOPD group and single CAP group (χ (2)=24.421, P=0.001). Advanced Chi-square analysis for patients of normal, acute respiratory acidosis, respiratory alkalosis, metabolic acidosis, metabolic alkalosis were done and showed no statistical difference (χ (2)=5.280, P=0.260). It is indicated chronic respiratory acidosis occurrences rate in AECOPD patients was higher than single CAP patients.
  
  
  CONCLUSIONS
  Our study demonstrated that automated acid-base mapping may be helpful for emergency physician to rapidly recognize multi-acid-base disturbance in patients with CAP, and to promptly identify acute or chronic phase of respiratory disease.
authors.affiliation: Department of Emergency, Shanghai Jiaotong University School of Medicine, Shanghai, China.
authors.forename: Xu-feng
authors.initials: XF
authors.lastname: Yang
authors.forename: Hai-rong
authors.initials: HR
authors.lastname: Wang
authors.forename: Jin-hua
authors.initials: JH
authors.lastname: Gu
authors.forename: Jian
authors.initials: J
authors.lastname: Jiang
authors.forename: Shu-ming
authors.initials: SM
authors.lastname: Pan
mesh_terms: D000136:Acid-Base Equilibrium; D000368:Aged; D000369:Aged, 80 and over; D001784:Blood Gas Analysis / Q000379:methods*; D017714:Community-Acquired Infections / Q000097:blood* / Q000175:diagnosis / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000097:blood* / Q000175:diagnosis / Q000628:therapy; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood* / Q000175:diagnosis / Q000628:therapy