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As mentioned in the introductory chapter, my observations led to further studies on the role of vitamin D and calcium on vascular tone, blood pressure, and hypertensive states. It was natural for studies to begin to explore the impact of vitamin D on vascular tone, cardiac contractility, neuron function, and hormone release and function. Calcium ions play an important role in signal transduction pathways where they act as a second messenger, in neurotransmitter release from neurons, in contraction of all muscle cell types, and in fertilization. The important role of vitamin D in calcium homeostasis which in turn is so important to the cellular functions of diverse organs naturally led to interest in studying its role in extraskeletal health.

Inverse correlations have been seen of several common ICU outcomes with levels of vitamin D at entry to the ICU, but the current effort is now in clarifying a role for routine measurement of these levels and the possible role of at least vitamin D replacement or even supplementation in the ICU patient with multiple organ pharmacologic or mechanical life support. Finally, studies have focused on outcomes in seriously ill patients with those diseases when hospitalized in the intensive care unit (ICU). Cellular pathophysiology of these findings was explored. It was surprising that not only was there higher mortality from those diseases associated with low vitamin D levels, but also all-cause mortality was higher as well. Next came investigations into extraskeletal diseases which appeared to be more prevalent in vitamin D-deficient individuals.

This was the beginning of exploration of vitamin D in extraskeletal health.

Subsequent knowledge of basic cellular physiology led to studies of the role of vitamin D in other tissues where calcium flux is important to cellular functions. Original work proved the importance of this axis on bone and skeletal homeostasis. There has been a progression of investigations of the biology and pharmacology of vitamin D.

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