What question did this study set out to answer?

To examine the effects of varying alveolar oxygen partial pressure on nitric oxide and carbon monoxide diffusing capacities, membrane diffusing capacity, and pulmonary capillary blood volume.

December 1, 1991Clinical Science

Effect of varying alveolar oxygen partial pressure on diffusing capacity for nitric oxide and carbon monoxide, membrane diffusing capacity and lung capillary blood volume

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Why the study?

Does varying alveolar oxygen partial pressure affect diffusing capacity for nitric oxide and carbon monoxide?

Key Points

To examine the effects of varying alveolar oxygen partial pressure on nitric oxide and carbon monoxide diffusing capacities, membrane diffusing capacity, and pulmonary capillary blood volume.
Assessed 10 subjects performing combined DLCO and DLNO single-breath maneuvers using three distinct inspired oxygen concentrations (25%, 18%, and 15%) to establish alveolar oxygen partial pressures between 12 and 20 kPa.
Calculated membrane diffusing capacity (DM) and lung capillary blood volume (Qc) utilizing a novel computational method derived from paired DLNO and DLCO recordings.
Lowering alveolar oxygen partial pressure from 20 to 12 kPa significantly increased DLCO according to the relation DLCO = -0.124(O2%) + 11.67 (P < 0.001) while significantly decreasing DLNO according to DLNO = 0.538(O2%) + 32.01 (P < 0.001) and lowering the DLNO/DLCO ratio (P < 0.001).
Mean DMCO was 52.89 mmol min⁻¹ kPa⁻¹ and Qc was 0.056 L, with both DM (P = 0.59) and Qc (P = 0.64) exhibiting non-significant downward trends as alveolar oxygen tension declined.

Structured PICO

Does varying alveolar oxygen partial pressure affect diffusing capacity for nitric oxide and carbon monoxide?

Population

10 subjects

Intervention

Inspired mixture with varying oxygen concentrations (25%, 18%, and 15%) to give PAO2 values of 12-20 kPa

Outcome

Diffusing capacity for nitric oxide (DLNO) and carbon monoxide (DLCO)surrogate

Varying alveolar oxygen partial pressure affects the diffusing capacity for nitric oxide and carbon monoxide, likely due to diffusion rather than reaction limitation.

Discussion

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Implication

PAO2 variation may influence DLCO/DLNO interpretation; hypothesis-generating for standardization of pulmonary function testing.

Cite This Study

Borland et al. (1991) studied this question.

synapsesocial.com/papers/6a6f3f33e71d69abee07eceb https://doi.org/10.1042/cs0810759

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Bookmark

Effect of varying alveolar oxygen partial pressure on diffusing capacity for nitric oxide and carbon monoxide, membrane diffusing capacity and lung capillary blood volume

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Effect of varying alveolar oxygen partial pressure on diffusing capacity for nitric oxide and carbon monoxide, membrane diffusing capacity and lung capillary blood volume

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider