Reduced vitamin D levels are associated with stroke-associated pneumonia in patients with acute ischemic stroke

I see nothing here that suggests that a protocol was written and distributed to all stroke hospitals in the world.  So because we have no great stroke association with a database of all research and  protocols and the means to distribute stroke research to all stroke medical professionals and every one of the 10 million yearly stroke survivors, this will fall by the wayside. 

Reduced vitamin D levels are associated with stroke-associated pneumonia in patients with acute ischemic stroke

Clinical Interventions in Aging — Huang GQ, Cheng HR, Wu YM, et al. | January 02, 2020

By performing this study with 863 consecutive acute ischemic stroke patients, researchers examined the potential link between serum vitamin D levels and stroke-associated pneumonia (SAP). They defined in-hospital SAP as a complication that happened following a stroke, during hospitalization, that was verified radiographically. Within 24 hrs of admission, measurements of serum vitamin D levels were obtained, and patients were classified as vitamin D sufficient (> 50 nmol/L), insufficient (25–50 nmol/L), and deficient. They detected significantly lower vitamin D levels in patients with SAP vs those without SAP. Patients with vitamin D deficiency vs those with vitamin D insufficiency or sufficiency exhibited a significantly higher incidence of SAP. An independent link of vitamin D deficiency and insufficiency with SAP was revealed following adjustment for confounders. A linear relation to the risk of SAP was demonstrated by vitamin D levels in multiple-adjusted spline regression. Overall, decreased vitamin D was identified as a potential risk factor of in-hospital SAP, which can assist clinicians to recognize high-risk SAP patients.

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