01
Bone Loss Is a Remodelling Ratio
Microgravity bone loss is set by the ratio of mechanical loading to remodelling rate rather than by the absence of load, so brief high-strain loading can preserve bone that continuous low loading cannot.
Eleven domains · two claims each · not peer reviewed
Eleven domains where a clinical decision is made on a level — a dose, a saturation, a count, a pressure — and where the evidence keeps pointing at a ratio instead: signal to noise, load to reserve, nucleation to elimination.
Microgravity bone loss is set by the ratio of mechanical loading to remodelling rate rather than by the absence of load, so brief high-strain loading can preserve bone that continuous low loading cannot.
Spaceflight anaemia is a regulated reduction in red cell mass matched to a reduced plasma volume rather than destruction of healthy cells, so it should resolve with volume restoration rather than with iron or erythropoietin.
Decompression sickness risk is set by the ratio of bubble nucleation rate to gas elimination rate rather than by peak supersaturation, so a slower ascent can be riskier than a faster one with better elimination.
Central nervous system oxygen toxicity is set by the rate of oxygen delivery to tissue rather than by cumulative dose, so intermittent exposure at high partial pressure can be safer than continuous exposure at lower pressure.
Acute mountain sickness is set by the ratio of ventilatory response to fluid flux into the brain rather than by oxygen saturation, so two people at the same saturation can differ in symptoms.
High-altitude adaptation is set by the ratio of nitric oxide availability to endothelin tone rather than by haemoglobin concentration, so populations with similar haemoglobin can differ in adaptation.
Poison severity is set by the area under the concentration-time curve rather than by the ingested amount, so a large ingestion of a rapidly eliminated substance can be milder than a small one that persists.
Antidote efficacy is set by the ratio of antidote kinetics to toxin kinetics, so an antidote with the right mechanism but slower onset than the toxin fails.
Adverse event reporting rates are set by the ratio of media coverage to baseline incidence, so a signal can appear for a drug with no change in true risk if coverage rises.
Disproportionality signal thresholds should scale with the ratio of reports to exposure rather than with report counts, so a drug with high exposure needs proportionally more reports to generate the same signal.
Triage accuracy is set by the ratio of decision time to patient acuity, so accuracy degrades nonlinearly as the time available falls rather than declining smoothly.
Trauma survival is set by the ratio of time to definitive care to physiological reserve, so the same delay is survivable for a fit patient and fatal for a depleted one.
Frailty is set by the ratio of physiological reserve to accumulated load rather than by age or comorbidity count, so a younger patient with high load can be frailer than an older one with more reserve.
Falls are set by the ratio of sensory noise to postural reserve rather than by either alone, so interventions that reduce noise and interventions that build reserve should have additive effects.
Opioid relief of dyspnoea is set by the ratio of mu-opioid occupancy to ventilatory drive rather than by dose, so a patient with high drive needs more drug for the same relief.
Delirium occurs when the ratio of neuroinflammatory load to cognitive reserve exceeds a threshold, so the same infection produces delirium in one patient and not another.
Prosthetic embodiment is set by the ratio of sensory feedback bandwidth to motor command latency, so a device with fast feedback and slow control feels less like a limb than one with both matched.
Prosthetic socket failure is set by the ratio of mechanical impedance mismatch to tissue tolerance rather than by pressure alone, so a compliant interface can tolerate higher load.
The size of a language's vowel space is set by the ratio of articulatory effort to perceptual distinctiveness, so languages with similar inventories can distribute vowels differently.
Speech intelligibility in noise is set by the ratio of speech envelope modulation depth to masker modulation, so a fluctuating masker can be less damaging than a steady one at the same level.
Trial power is set by the ratio of effect size to outcome measurement noise rather than by sample size, so improving measurement can raise power more cheaply than recruiting more patients.
The bias introduced by trial dropouts is set by the ratio of differential dropout to the event rate, so a small imbalance can badly distort a trial with few events and barely matter in one with many.
Each is a setting where a decision rule is calibrated on a single measurement, and where the two entries in the domain argue that the measurement is one term of a ratio. Space medicine and diving are there because their extreme conditions make the ratios visible; geriatrics and palliative care because the same arithmetic governs reserve.
Entry page: transept.html. There is deliberately no index.html.
Publication records: source hashes · original README · original manifest · additive publication note