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Hypoxia vs Hyperventilation

Updated: Aug 13, 2020

Hypoxia, 顧名思義 缺氧 LACK OF OXYGEN.

Hyperventilation 就係 相反 Excessive breathing rate, abnormal Loss of Carbon Dioxide.


雖然有咁大分別, 但當hypoxia/hyperventilation 發生, 好容易令人混淆兩者.

因為有d Common symptoms Hypoxia 同Hyperventilation 都有:

  1. Visual Impairment

  2. Lightheaded or Dizzy Sensation

  3. Tingleing Sensation or Numbness

所以會比較confusing; 但係有D symptoms 相對比較有指標性.


Hypoxia 指標性symptoms:

  1. Cyanosis-(Blue Fingernail & Lips) (有呢個symptoms 一定同hypoxia 有關)

  2. Headache

  3. Decreased Reaction time

  4. Impaired Judgement

  5. Drowsiness

  6. Air hunger ( 有機會由hypoxia 變hyperventilation)

Hyperventilation 指標性symptoms:

  1. Muscle spasms

  2. Cold and hot sensations


Hypoxia 分4種:

  1. Hypoxic hypoxia Insufficient Oxygen (at high alitude)

  2. Hypemic hypoxia Blood cannot carry Oxygen (common cause CO poisoning 中一氧化碳毒)

  3. Stagnant hypoxia Poor blood circulation (High G load maneuver)

  4. Histoxic hypoxia Cell unable to use(酒鬼/煙剷)


 

好似好難記; 我諗左個金田一故事去記~


幻想下

有間工廠(organ) 需要100件原材料(氧) 先operate到； 有專屬車隊運呢100 件原材料去工廠~


有一日，工廠發生問題 operate唔到~but WHY??

又係講時間請 金田一 揾兇手~


疑犯1) supplier 根本無咁多原材料俾工廠

無蕉無扇 神仙難變


高空 空氣稀薄，insufficient/ reduction of the PP O2 (partial

pressure of oxygen,令肺部唔夠氧去身體各部分,

呢個就係hypoxic hypoxia.


疑犯2) 順豐車隊 出問題

唔夠車(hemoglobin 紅血球) 運原材料(氧氣) 去工廠(organ)


通常係一氧化碳中毒 令紅血球車隊甩轆運唔到氧氣

或者天生貧血or Blood lose而唔夠氧運到去organ

Hypemic hypoxia


疑犯3) 紅隧大塞車

順豐車隊 因車流停頓 oxygen無法送到工廠


通常係因為 血管受壓 或者 High G load.

Stagnet hypoxia




疑犯4) 工廠出問題

原材料成功運到工廠門口， 工廠工人罷工 唔做野

HistoTOXIC hypoxia

講明係toxic, 即係organ tissue中左毒~

Primary factor: 煙，酒，山埃(FAA係寫cyanide)


 

Hypoxia 可以好危險, 尤其是high altitude operation; time of consciousness 可以好短!

In case, decompression at FL400, pilot 只係得幾秒鐘去react, 帶上oxygen mask.


Helio flight 522, the ghost flight 係一個好好ge case study for hypoxia.

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