Angurana SK Serum Vitamin D Status and Outcome among Critically Ill Children Admitted to the Pediatric Intensive Care Unit in South India: Correspondence. Indian J Pediatr. 2016 Aug;83(8):910-1. doi: 10.1007/s12098-015-1992-z. Epub 2016 Jan 14.
Balasubramanian S, Dhanalakshmi K, Amperayani S Vitamin D deficiency in childhood-a review of current guidelines on diagnosis and management. Indian Pediatr. 2013 Jul;50(7):669-75. Review.
Gandhi J, Sangareddi S, Varadarajan P, Suresh S Pediatric index of mortality 2 score as an outcome predictor in pediatric Intensive Care Unit in India. Indian J Crit Care Med. 2013 Sep;17(5):288-91. doi: 10.4103/0972-5229.120320.
Greenbaum LA Rickets and Hypervitaminosis. In: Kliegman RM, Stanton BF, Geme III JW, Schor NF. (eds). Nelson Textbook Of Pediatrics. 20th ed. Philadelphia: Elsevier; 2016. p.331-38.
Williams S, Heuberger R Outcomes of Vitamin D Supplementation in Adults Who are Deficient and Critically Ill: A Review of the Literature. Am J Ther. 2016 Nov/Dec;23(6):e1890-e1902. Review.
The Association of Vitamin D Supplementation With the Outcome in Critically Ill Children
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
