oxygen consumption) leads to an increase in alveolar ventilation
and volatile anesthetic uptake in neonates when compared to adults.
Arousal from sleep restores alveolar ventilation
to a variable degree, while resumption of sleep reduces ventilation in a cyclical fashion.
R] to body movement, so-called 'entrained breathing' which is characteristic of some activities, preventing VE from reaching a mechanical optimum, and limiting alveolar ventilation
A pulse oximeter assesses capillary oxygen saturation, but arterial blood gas (ABG) measurement is the best way to assess alveolar ventilation
Arterial blood gas determinations of PCO, provide the most accurate determinations of the adequacy of alveolar ventilation
Decreased alveolar ventilation
may be due to a reduction in minute ventilation or increased dead space ventilation.
Using on-line, breath-by-breath analysis of lung function, the ventilator is driven by a programmed computer to provide optimal alveolar ventilation
, according to the patient's changing requirements (Fig.
Ventilator dyssynchrony can cause increased intrathoracic pressure, decreased alveolar ventilation
, and increased work of breathing for the patient.
Hypoventilation occurs when the level of alveolar ventilation
is insufficient to meet metabolic needs.
Of the studied physiologic factors, the blood:air partition coefficient and alveolar ventilation
were most significant in determining the respiratory uptake (p < 0.
2]-free gas expired from the large airway and tracheal tube dead space, Phase H represents a mixture of gas from both the large airway dead space and alveolar dead space and Phase III (or alveolar plateau) represents alveolar ventilation
They likewise stimulate increase alveolar ventilation
and acute respiratory alkalosis.
Assuming the anatomical deadspace in intubated patients to be approximately 70 ml (12), the reduction of alveolar ventilation
during PC ventilation would be close to 40% which could be expected to increase the [P.
Hypoxia through a chemoreceptor mechanism increases the depth of alveolar ventilation
, which can be increased by as much as 60 percent at higher elevations.
8 in the equation immediately following; getting 'A' and 'a' confused as subscripts when referring to alveolar and arterial partial pressures; the partial pressure of carbon dioxide is certainly proportional to the ratio of production to alveolar ventilation
, but it is certainly not equal to this ratio.