AACN ECCO Pulmonary Practice Exam 2026 - Free Pulmonary Exam Practice Questions and Study Guide

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What indicates a need for ventilatory replacement according to ABG results?

pH 7.20, PaO2 88

pH 7.30, PaCO2 55

pH 7.40, HCO3 24

pH 7.20, PaCO2 58

A pH of 7.20 coupled with a PaCO2 of 58 indicates a state of respiratory acidosis, which is significant because the blood pH is considerably below the normal range of 7.35 to 7.45. This low pH suggests that the body is unable to effectively remove carbon dioxide, leading to an accumulation that depresses the pH levels. Elevated PaCO2 indicates inadequate ventilation, which further compounds the acidotic state.

In cases like this, ventilatory support is warranted to help restore appropriate gas exchange and normalize both pH and carbon dioxide levels. The presence of severe acidosis with hypercapnia (high levels of carbon dioxide) necessitates prompt intervention to prevent significant physiological detriment. This scenario highlights the critical need for ventilatory assistance in cases of respiratory failure where the body cannot meet its metabolic demands effectively.