Ultrasonography lacks validation
The authors summarized the key concerns about fluid therapy. Fluid therapy should be initiated for patients with evidence of sepsis-induced hypoperfusion who are likely to have increased cardiac output with fluid administration. Fluid administration should be discontinued when evidence of hypoperfusion resolves, the patient no longer responds to fluid, or the patient shows evidence of fluid overload.
Balanced solutions should be selected over 0.9% saline for fluid therapy, according to the review. Hydroxyethyl starches should not be used.
Fluid removal should be considered after the resuscitation and optimization phases and when a patient has stabilized, the authors wrote. Diuretics are first-line therapy to facilitate fluid elimination.
Kidney replacement therapy may be considered for patients with severe acute kidney injury who have complications from fluid overload and are unresponsive to diuretic therapy.
“The use of ultrasonography as a bedside tool to guide fluid resuscitation is promising but lacks validation in robust randomized controlled trials,” said Dr. Zampieri. “Point-of-care ultrasound may be useful to assess causes of shock and [helping to exclude] a life-threatening diagnosis at presentation, such as cardiac tamponade.”
Pending the emergence of further evidence, the authors suggest that clinicians prescribe fluids judiciously, preferably at aliquots followed by frequent reassessment. “Defining a resuscitation target (such as capillary refill time or lactate, among others) and performing fluid challenges to correct them while no overt signs of fluid overload (such as pulmonary edema) occur is a common practice that is also sustained by clinical research,” said Dr. Zampieri.
He added that the review’s recommendations are based on research conducted mainly in high-income settings, and that generalizability will depend on factors such as local standards of care and resource availability.
“Our review provides an overall guidance, but caution is warranted before extrapolating the suggestion to every possible clinical scenario,” he concluded.
Fluids as drugs
Commenting on the review, Hernando Gomez, MD, MPH, an associate professor of critical care medicine at the University of Pittsburgh, said: “I agree with the conclusions and commend the authors for this very practical revision of the literature.” Dr. Gomez was not involved in the review.
“I would like to stress the point, however, that although fluids can be harmful, particularly when not indicated and when used in excess, fluid resuscitation in patients with sepsis who have evidence of hypoperfusion is paramount,” he said.
“The association between fluid accumulation and poor outcomes is truly a Goldilocks problem, often described in the literature as a ‘U’ shape, where too little fluid (i.e., a very restrictive strategy) or too much fluid (i.e., use in excess and in discordance with the patient’s needs) can be harmful,” said Dr. Gomez.
Furthermore, every strategy to assess fluid responsiveness has limitations. “It is key that clinicians resist the temptation to dismiss these limitations, because decisions made on flawed data are as dangerous as not assessing fluid responsiveness in the first place,” he said.
Based on the evidence, clinicians should “think of fluids as a drug and carefully assess risks and benefits before deciding to administer fluids to their patients,” Dr. Gomez added. It is also important to separate the question “Does my patient need fluids?” from the question “Is my patient fluid responsive?”
“These are two different questions that often get conflated,” Dr. Gomez said. “If a bolus of fluid given to a patient who needs fluids and is fluid-responsive does not improve tissue perfusion, then fluids should not be given.”
No funding was reported for the review. Dr. Zampieri reported receiving fluids and logistics from Baxter Hospitalar during the conduct of the BaSICS trial, personal fees from Bactiguard for statistical consulting and from Baxter for participating in an advisory board, grants from Ionis Pharmaceuticals outside the submitted work, and serving as lead investigator of the BaSICS trial. Dr. Gomez reported no relevant financial relationships.
A version of this article first appeared on Medscape.com.