Pulmonology · ICU and Critical Care
Bohr Dead Space Fraction (Vd/Vt) calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 20–80 mmHg
Allowed range: 10–70 mmHg
Result
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Clinical inputs
- Arterial PaCO₂ (mmHg)Accepted range: 20 to 80
- Mixed expired PĒCO₂ (mmHg)Accepted range: 10 to 70
Primary source
Enghoff modification of the Bohr equation as given in Blanch L, López-Aguilar J, Lucangelo U. Dead space in acute respiratory distress syndrome: more than a feeling! Crit Care 2016;20:214. DOI 10.1186/s13054-016-1381-7: VD/VT phys = (PaCO₂ − PĒCO₂) ÷ PaCO₂, with PaCO₂ arterial and PĒCO₂ mixed expired CO₂ partial pressure. A high VD/VT was independently associated with death in ARDS (Nuckton TJ et al. N Engl J Med 2002, PMID 11973365). (2016)
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