发 绀 Cyanosis. 原南京中大附属医院神内科主任、硕士生导师 佛山大学医学院医学系孟红旗教授、主任医师 Professor 、 Doctor director 、 Neurologist. Definition.
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ProfessorDoctor director Neurologist
Likewise, local passive congestion, which causes an increase in the total amount of reduced hemoglobin in the vessels in a given area, may cause cyanosis.
Mechanisms of Cyanosis
Caused by absolute increase of amount of reduced
Hb in blood, usually > 5g/dl (capillary)
The higher the hemoglobin concentration,
The greater tendency toward cyanosis.
Normal Polycythemia Anemia
Impaired pulmonary function
1. Airway obstruction
2. Pulmonary diseases
Tetralogy of Fallot
Hereditary: very rare
Acquired: >3g/dl in blood
- intake or exposure to some drugs or
chemicals, such as sulfa drugs, nitrite
salt. enterogenic cyanosis
Caused by some drugs or chemicals,
Sulfhemoglobin > 0.5g/dl in blood
Approach to Patients with Cyanosis
Cyanosis Skin temp. Massage()or warming
Central Warm No change
Peripheral Cool Cyanosis fades
Disorders of respiratory or cardiovascular system
Sulfhemoglobinemia: Spectroscopy helpful
Severe, long duration