Regional circulatory responses to
hypocapnia and hypercapnia in barheaded geese.
Classification of transient loss of consciousness Traumatic T-LOC * Concussion Non-traumatic T-LOC * Syncope * Epileptic seizure * Psychogenic pseudosyncope * Hypoglycaemia * Hypoxia * Hyperventilation with
hypocapnia * Intoxication * Vertebrobasilar TIA T-LOC = transient loss of consciousness; TIA = transient ischaemic attack.
This assumption is based the findings of our previous study, which suggested
hypocapnia as the main factor underlying the decrease in both ocular blood flows during exhaustive exercise (Ikemura and Hayashi, 2012b).
Remarkably, larger differences in hyperventilation were associated with consistently smaller intergroup differences (1-way ANOVA, P = 0.025) in Pa[O.sub.2] and even smaller differences when
hypocapnia was accounted for (standard Pa[O.sub.2], P = 0.082), thus indicating a reduced efficiency of pulmonary exchange despite normal pH values.
The issue at stake here is that although this study demonstrated that hyperoxaemia and
hypocapnia may increase the severity of brain injury after intrapartum asphyxia, Tracy et al.
This condition is related to recurring attacks of apnea, hypopnea and hyperpnea, sleep disruptions, arousals, intermittent hypoxemia,
hypocapnia, and hypercapnia, and intrathoracic pressure changes.
As Curley and colleagues note, (5) "
hypocapnia remains a common--and generally underappreciated--component of many disease states." They add that "
hypocapnia may be a pathogenic entity in the setting of critical illness." (5)
This results in
hypocapnia, which will return to normal levels around five weeks postpartum.
For example, the specificity of cerebral perfusion changes under hypercapnia or
hypocapnia states has been evaluated [18].
For example, hypoxia stimulates ventilation, subsequently leading to
hypocapnia, and subsequently, apnoea.
* Stimulation of respiration causing initial
hypocapnia and respiratory alkalosis
Arterial blood gas analysis showed hypoxemia and mild
hypocapnia (Pa[O.sub.2] 53 mm Hg and PaC[O.sub.2] 33.8 mm Hg on room air).