Elevated End-Tidal Pco2 During Long-Duration Spaceflight
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND : Elevated ambient Pco 2 in the International Space Station (ISS) has been cited as a potential contributor to the vision impairment intracranial pressure syndrome (VIIP), a significant health risk for astronauts during long-duration space missions. The elevation in ambient Pco 2 is rather modest and normal respiratory compensation could minimize the impact on arterial Pco 2 . METHODS: In nine male astronauts, breaths measured prior to a rebreathing maneuver were examined to assess inspired and end-tidal Pco 2 during upright seated preflight and in-flight conditions. RESULTS: Inspired Pco 2 increased from preflight baseline (0.6 ± 0.1 mmHg) to in flight (3.8 ± 0.4 mmHg). End-tidal Pco 2 also increased from preflight baseline (36.0 ± 3.2 mmHg) to in flight (42.1 ± 3.7 mmHg). The difference between end-tidal Pco 2 comparing in flight to preflight (6.1 ± 1.6 mmHg) was greater than the difference between inspired Pco 2 comparing preflight to in flight (3.3 ± 0.5 mmHg). DISCUSSION: The greater increase in end-tidal vs. inspired Pco 2 might reflect alveolar hypoventilation due to differences in ventilatory control with spaceflight. These data suggest that further studies should focus on arterial Pco 2 and acid-base balance to determine if CO 2 dilates cerebral and retinal vessels and might contribute to the incidence of VIIP in astronauts.Hughson RL, Yee NJ, Greaves DK. Elevated end-tidal Pco 2 during long-duration spaceflight . Aerosp Med Hum Perform. 2016; 87(10):894–897.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it