Generic Caverta (Sildenafil citrate 100mg)
BLOOD GASES - ARTERIAL BLOOD GAS ANALYSIS (IMPLICATIONS OF RESULTS)
Low PaO2, 02CT, and 02 Sat levels, in combination with a high PaC02 value, may be due simply to rebreathing air in a poorly ventilated room. More serious underlying causes include respiratory muscle weakness or paralysis (as in Guillain-Barre syndrome), respiratory center inhibition (from head injury, brain tumor, or drug abuse, for example), and airway obstruction (possibly from mucous plugs or a tumor). Similarly, low readings may result from bronchiole obstruction caused by asthma or emphysema, from an abnormal ventilation-perfusion ratio due to partially blocked alveoli or pulmonary capillaries, or from alveoli that are damaged or filled with fluid because of disease, hemorrhage, or near-drowning.
When inspired air contains insufficient oxygen, Pa02, 02CT, and 02 Sat also decrease, but Paco2 maybe normal. Such findings are common in pneumothorax, impaired diffusion between alveoli and blood (due to interstitial fibrosis, for example), or in an arteriovenous shunt that permits blood to bypass the lungs.
Low 02CT—with normal Pa02, 02 Sat, and possibly, PaC02 values—may result from severe anemia, decreased blood volume, and reduced hemoglobin oxygen-carrying capacity.
In addition to clarifying blood oxygen disorders, ABGs can give considerable information about acid-base disorders, as shown in the accompanying chart.
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General health
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