CYANOSIS Physical Exmination DIFFERENTIAL CENTRAL PERIPHERAL pAo2(mmH1g)RmAr↓Ams↑egs↑Ams↓ legs=50)(50butO2Sa0 0 Methemoglobinemia relieved by T/GA with Coart Coart with extremity R→LPDA R→LPDA PaO2 after bagging No significant change PaO2: 100mmHg or more with 100% FiO2 Noncyanotic CHD in CHF psis CNS High Hy ypo- Primary Hct glycemia Lung Disease 30% Hct Blood sugar arge heart FNotmal heart Heart size may Usually normal Chest X-ray be increased heart sizeCYANOSIS Physical Exmination DIFFERENTIAL CENTRAL PERIPHERAL pAo2 (mmHg) Rm Air Arms  legs  Arms  legs (>50) (<50but O2Sat) >50 relieved by warming extremity T/GA with Coart R→L PDA Coart with R→L PDA Methemoglobinemia PaO2 after bagging with 100% FiO2 No significant change PaO2 :100mmHg or more Noncyanotic CHD in CHF Sepsis CNS High Hct Hypo￾glycemia Primary Lung Disease Hct Blood Sugar Chest X-ray Large heart Notmal heart Heart size may be increased Usually normal heart size >70% 30％