Hyperventilation and Asthma

  • 14 Oct 2010
  • Reading time 5 mins
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Does chronic hyperventilation cause asthma? by Patrick McKeown

In an article entitled Hyperventilation Syndrome and Asthma, Demeter notes: “Hyperventilation whether spontaneous or exercise induced, is known to cause asthma” [1]. Demeter offers an explanation as to why hyperventilation syndrome receives very little attention in the treatment of asthma. Firstly, he explains that it is very difficult to make a diagnosis of hyperventilation in laboratory tests and secondly “no mention is made of any link” between hyperventilation syndrome and asthma [1]. For a paper by Elshout et al, which was published in the highly respected medical journal Thorax, a study was done to determine what happens to airway resistance when there is an increase of carbon dioxide (hypercapnia) or a decrease (hypocapnia) [2]. It was found that an increase of carbon dioxide determined by measuring end tidal CO2 resulted in a “significant fall” in airway resistance in both normal and asthmatic subjects. This simply means that an increase of carbon dioxide caused the airways to become less restricted, resulting in a reduction of asthma symptoms.

In another paper, entitled The mechanism of bronchoconstriction due to hypocapnia in man, Sterling writes that “hypocapnia (loss of carbon dioxide) due to voluntary hyperventilation in man causes increased resistance to airflow”. Furthermore, when subjects inhaled an air mixture containing 5% carbon dioxide “bronchoconstriction was prevented, indicating that it had been due to hypocapnia, not to mechanical factors associated with hyperventilation” [3]. The following is a quotation from a paper entitled Demonstration and treatment of hyperventilation causing asthma: “Hyperventilation, leading to airways cooling, will cause bronchoconstriction in vulnerable individuals” but, “because attacks of asthma are accompanied by hyperventilation of physiological origin, the role of hyperventilation in causing asthma attacks may be overlooked”. The article concludes that “this case demonstrates that training in controlled breathing can help patients who hyperventilate to avoid some attacks of asthma” [4].

Prolonged hyperventilation
When hyperventilation occurs over a small period of time, it’s not a problem. In this situation, the respiratory centre senses the decrease of carbon dioxide and so automatically reduces or stops the breathing process to enable it to restore to preset levels [5]. In this situation therefore, hyperventilation is only a short-term phenomenon. However, if overbreathing is prolonged over a long period of time, physiological changes occur in the body resulting in hyperventilation becoming a more permanent ......

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