Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems

Singh, Kanwarjot; Michaud, Dervens; Parness, Tal; Mgbeke, Odinaka; Okodaso, Henry; Jones, Kwami; Ikolo, Bawo Teddy; Thomas, Shellon; Ikolo, Felicia

doi:10.3390/biomedicines14081682

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Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems

by

Kanwarjot Singh

¹,

Dervens Michaud

¹

,

Tal Parness

¹,

Odinaka Mgbeke

^2,3

,

Henry Okodaso

⁴,

Kwami Jones

⁵,

Bawo Teddy Ikolo

⁶,

Shellon Thomas

⁵

and

Felicia Ikolo

^3,5,*

¹

School of Medicine, Saint George’s University, St. George’s P.O. Box 7, Grenada

²

Department of Clinical Skills, School of Medicine, Saint George’s University, St. George’s P.O. Box 7, Grenada

³

Sickle Cell Association of Grenada, St. George’s P.O. Box 436, Grenada

⁴

Department of Anatomical Sciences, School of Medicine, Saint George’s University KBT Global Scholars Program, Northumbria University, Newcastle upon Tyne NE1 8ST, UK

⁵

Department of Biochemistry, School of Medicine, Saint George’s University, St. George’s P.O. Box 7, Grenada

⁶

Department of Biology, Ecology & Conservation, School of Arts and Sciences, Saint George’s University, St. George’s P.O. Box 7, Grenada

^*

Author to whom correspondence should be addressed.

Biomedicines 2026, 14(8), 1682; https://doi.org/10.3390/biomedicines14081682

Submission received: 16 June 2026 / Revised: 8 July 2026 / Accepted: 17 July 2026 / Published: 27 July 2026

(This article belongs to the Special Issue Advances in Rare and Complex Multisystem Disorders: From Molecular Mechanisms to Clinical Practice)

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Abstract

Sickle cell disease (SCD) is a monogenic hemoglobinopathy in which hemoglobin S (HbS) polymerizes on deoxygenation, leading to sickling of red blood cells (RBCs) and driving the acute vaso-occlusive crisis (VOC). With curative (transformative) therapies inaccessible to most patients in sub-Saharan Africa and the Caribbean, where burden is highest, optimizing acute VOC care is a priority; yet oxygen is given reactively, after hypoxemia is documented, not at symptom onset when polymerization is most interruptible. We conducted a structured narrative review integrating HbS polymerization kinetics, clinical studies of oxygen-based therapies, trial protocols, and home-care implementation evidence (PubMed, Scopus, Google Scholar; 1974–2026). When RBCs release oxygen, HbS does not solidify at once: a brief pause, the nucleation delay phase (t_D), precedes polymerization and sickling. Because t_D falls steeply as deoxygenated hemoglobin rises (inversely, to its ~30th–50th power), a small early gain in oxygen saturation (~5–10%) lengthens it many-fold, opening a short window, roughly 30 min from onset, during which oxygen may abort a crisis. The clinical message is that timing, not dose, is decisive: oxygen at the first symptoms may prevent a crisis that the same oxygen, given later, cannot. Standard, high-flow, hyperbaric, and inhaled nitric-oxide modalities help in selected hospital settings, and the DREPADOM model shows community delivery before hospital arrival is feasible and safe. The central argument is precision in timing, not quantity: starting oxygen at symptom onset could turn a low-cost, universally available treatment into a crisis-aborting one for patients beyond the reach of curative therapy. We advance this as a mechanistically grounded but clinically untested hypothesis; regional implementation trials in the Caribbean and sub-Saharan Africa are urgently warranted.

Keywords: sickle cell disease; vaso-occlusive crisis; oxygen therapy; hemoglobin S polymerization; nucleation delay phase; golden half hour; early intervention; DREPADOM; Caribbean health systems; health equity

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MDPI and ACS Style

Singh, K.; Michaud, D.; Parness, T.; Mgbeke, O.; Okodaso, H.; Jones, K.; Ikolo, B.T.; Thomas, S.; Ikolo, F. Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems. Biomedicines 2026, 14, 1682. https://doi.org/10.3390/biomedicines14081682

AMA Style

Singh K, Michaud D, Parness T, Mgbeke O, Okodaso H, Jones K, Ikolo BT, Thomas S, Ikolo F. Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems. Biomedicines. 2026; 14(8):1682. https://doi.org/10.3390/biomedicines14081682

Chicago/Turabian Style

Singh, Kanwarjot, Dervens Michaud, Tal Parness, Odinaka Mgbeke, Henry Okodaso, Kwami Jones, Bawo Teddy Ikolo, Shellon Thomas, and Felicia Ikolo. 2026. "Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems" Biomedicines 14, no. 8: 1682. https://doi.org/10.3390/biomedicines14081682

APA Style

Singh, K., Michaud, D., Parness, T., Mgbeke, O., Okodaso, H., Jones, K., Ikolo, B. T., Thomas, S., & Ikolo, F. (2026). Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems. Biomedicines, 14(8), 1682. https://doi.org/10.3390/biomedicines14081682

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Oxygen Timing as Therapy: Molecular Rationale and Clinical Imperative for Early Oxygen Administration in the Sickle Cell Disease Vaso-Occlusive Crisis—A Structured Narrative Review with Implications for Resource-Constrained Health Systems

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