Using the Bohr equation, calculate VD/VT with PaCO2 45 mmHg and PeCO2 38 mmHg.

Study for the Respiratory Therapy Test. Use flashcards and multiple choice questions, featuring hints and explanations. Prepare for your exam successfully!

Multiple Choice

Using the Bohr equation, calculate VD/VT with PaCO2 45 mmHg and PeCO2 38 mmHg.

The Bohr equation connects the fraction of dead space ventilation to CO2 levels, using VD/VT = (PACO2 − PECO2) / PACO2. Here, PaCO2 is 45 mmHg and mixed expired CO2 (PeCO2) is 38 mmHg, so the difference is 7 mmHg. Dividing 7 by 45 gives 0.1556, which rounds to approximately 0.156. So the dead-space fraction of tidal volume is about 0.156 (roughly 15.6%).

The Bohr equation connects the fraction of dead space ventilation to CO2 levels, using VD/VT = (PACO2 − PECO2) / PACO2. Here, PaCO2 is 45 mmHg and mixed expired CO2 (PeCO2) is 38 mmHg, so the difference is 7 mmHg. Dividing 7 by 45 gives 0.1556, which rounds to approximately 0.156. So the dead-space fraction of tidal volume is about 0.156 (roughly 15.6%).

More practice questions