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There are several clinical practice guidelines concerning the use of fluid and vasoactive drug therapies in critically ill adult patients, but the recommendations in these guidelines are often based on low‐quality evidence. Further, some were compiled prior to the publication of landmark clinical trials, particularly in the comparison of balanced crystalloid and normal saline. An important consideration in the treatment of critically ill patients is the application of precision medicine to provide the most effective care to groups of patients most likely to benefit from the therapy. Although not currently widely integrated into these practice guidelines, the utility of precision medicine in critical illness is a recognized research priority for fluid and vasoactive therapy management. The purpose of this narrative review was to illustrate the evaluation and challenges of providing precision fluid and vasoactive therapies to adult critically ill patients. The review includes a discussion of important investigations published after the release of currently available clinical practice guidelines to provide insight into how recommendations and research priorities may change future guidelines and bedside care for critically ill patients.

Oral warfarin is the standard of care for patients requiring long-term anticoagulation due to venous thromboembolic disease. Patients with Crohn's disease may have reduced absorption in the small bowel due to loss of effective surface area secondary to chronic inflammation, ulcerative lesions, or resection. A 27-year-old Caucasian woman with end-stage Crohn's disease was hospitalized with an upper extremity thrombosis. In this complicated patient, who was resistant to oral warfarin and unable to receive subcutaneous low-molecular-weight heparin, therapeutic anticoagulation was achieved with intravenous warfarin. Intravenous warfarin provides an alternative administration route for patients who cannot receive the oral formulation and cannot be administered subcutaneous low-molecular-weight heparins due to adverse effects.