Membership fees. The open access journal PeerJ is unique in charging a one-time membership fee ($100-350) that covers the editorial process and peer review, as well as the possible publication, of one, two, or a limitless number of manuscripts per year (depending on the level of membership).
Respiratory acidosis occurs when the arterial partial pressure of carbon dioxide (Pa CO2) is elevated above the normal range (>44 mm Hg) leading to a blood pH lower than 7.35.By definition, the diagnosis of respiratory acidosis requires measurement of Pa CO2 and pH. When the diagnosis is made, the underlying cause should be thoroughly investigated.
Most cases of respiratory acidosis are due to decreased alveolar ventilation. The defect leading to this can occur at any level in the respiratory control mechanism. This provides a convenient way to classify causes that is used in the following table. Alveolar hypoventilation may impair oxygen uptake.