ARTERIAL BLOOD GAS STUDIES
Measurements of blood pH and of arterial
oxygen and carbon dioxide tensions are obtained when managing patients with
res-piratory problems and in adjusting oxygen therapy as needed. The arterial
oxygen tension (PaO2) indicates the degree of oxy-genation of the blood, and
the arterial carbon dioxide tension (PaCO2) indicates the adequacy of alveolar
ventilation. Arterial blood gas studies aid in assessing the ability of the
lungs to pro-vide adequate oxygen and remove carbon dioxide and the ability of
the kidneys to reabsorb or excrete bicarbonate ions to main-tain normal body
pH. Serial blood gas analysis also is a sensitive indicator of whether the lung
has been damaged after chest trauma. Arterial blood gas levels are obtained
through an arterial puncture at the radial, brachial, or femoral artery or
through an indwelling arterial catheter.
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