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Correcting Hypernatremia: Enteral Or Intravenous Hydration?

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Correcting Hypernatremia: Enteral Or Intravenous Hydration? NUTRITION ISSUES IN GASTROENTEROLOGY, SERIES #137 Carol Rees Parrish, M.S., R.D., Series Editor Clinical Observations Correcting Hypernatremia: Enteral or Intravenous Hydration? by Carol Rees Parrish, Mitchell H. Rosner BACKGROUND ypernatremia is defined as a serum sodium the serum sodium rises (and with it serum osmolality), value > 145 mEq/L. Since the serum sodium thirst ensues along with rises in arginine vasopressin His determined by the ratio of the amount of (AVP) secreted by the posterior pituitary. AVP leads to sodium in the serum to the amount of plasma water, urinary concentration and conservation of renal water hypernatremia can develop from either an excess of excretion, but ultimately it is thirst and ingestion of sodium (such as due to the administration of hypertonic water that allows the serum sodium to normalize. Thus, fluids), a loss of hypotonic fluids (free water) or a most patients who develop hypernatremia have the combination of both. Most commonly, it is the loss of common feature that water intake is restricted in some hypotonic fluids and the failure to replace these water form. For instance, patients in the intensive care unit losses that result in hypernatremia. (ICU) who are intubated and sedated cannot control In most circumstances, thirst is a powerful defense their water intake and the same is true for patients with mechanism against a rise in the serum sodium level. impaired mental status or limited mobility. Thus, these The body defends its serum osmolality closely so that as patients are at high risk for hypernatremia (Table 1). Carol Rees Parrish MS, RD, Nutrition Support Epidemiology of Hypernatremia Specialist, Digestive Health Center of Excellence, Given the powerful ability of thirst to defend against Mitchell H. Rosner, MD, Henry B. Mulholland hypernatremia, it is not surprising that the incidence Professor of Medicine Chairman, Department of this electrolyte disorder in patients presenting to the of Medicine, Division of Nephrology, University emergency department (ED) is uncommon (0.2%).1 of Virginia Health System, Charlottesville, VA (continued on page 70) 68 PRACTICAL GASTROENTEROLOGY • DECEMBER 2014 Clinical Observations Correcting Hypernatremia: Enteral or Intravenous Hydration? NUTRITION ISSUES IN GASTROENTEROLOGY, SERIES #137 (continued from page 68) status and decreased thirst sensation, or the inability to Most of these outpatients usually have either chronic obtain free water (see Table 2). or acute impairment in their mental status (such as dementia). In critically ill patients, the incidence of Correction of Hypernatremia hypernatremia is 10-fold higher (2-6%).2,3 Importantly, As many patients with hypernatremia will be volume a large percentage of patients develop hypernatremia depleted as well as dehydrated, assessing the need for during the course of their hospital stays (especially in rapid resuscitation is critical, and if needed, intravenous the ICU – up to 10%).4,5 The reasons for this are multi- isotonic solutions should be administered until the fold and include: patient is hemodynamically stable. Before correction of hypernatremia, it is vital to determine if the rise in • Use of hypertonic fluids serum sodium is acute (< 48 hours) or more chronic (> • Ongoing loss of body fluid loss (gastric 48 hours). This is because with chronic hypernatremia, decompression, stool, ostomy, fistulas, biliary brain adaptations in cellular volume have occurred such drains, etc., inattention to water intake and needs) that rapid correction in these circumstances can result in cerebral edema, increased intracranial pressure and • Use of diuretics, lactulose brain stem herniation with death.12 In chronic states of hypernatremia the serum sodium should not be lowered 6 • Poorly controlled hyperglycemia. by more than 8 to 10 mmol/L/24 hours. If it is unclear as to the duration of hypernatremia, it is best to assume Consequences and Complications that the condition is chronic and use a slower rate of Associated with Hypernatremia correction. The clinical symptoms associated with hypernatremia Several formulas are available to determine the are alterations in central nervous system functioning, rates of infusion of hypotonic solutions and any of including a spectrum ranging from mild confusion to these can be utilized.7,13,14 However, it is critical that the stupor and coma. These symptoms likely result from clinician measure serum sodium levels frequently the changes in cellular volume as water moves from the duration of correction (every 4-6 hours), so that over- intracellular compartment to the more hypertonic rapid correction is avoided and infusion/replacement extracellular compartment resulting in cell shrinkage.7 rates for water can be adjusted. Water replacement Mortality rates in patients with hypernatremia, can be achieved in several manners: (1) intravenous especially those in the ICU, are very high (ranging hypotonic fluids which may range from 0.45% saline to from 15 to 50%), depending upon the severity of 5% dextrose in water or (2) enteral water administration. the hypernatremia.8,9 While hypernatremia has an independent effect on increased mortality, the Table 1. Patient’s at Risk for Hypernatremia underlying disease processes driving the development of hypernatremia is more likely to blame with the higher • Disturbed sensation of thirst mortality rates.10 • Unconscious Etiology of Hypernatremia Broadly speaking, the causes of hypernatremia can be • Water intake dependent on another divided into three categories: clinician/individual • water with solute loss (with water losses in excess Immobile patient of solute losses) o Altered mental status • pure water losses o Enterally fed patients • solute (sodium) gain.11 o o Critically ill patients In those cases of water with solute loss and pure water losses, most patients will have impaired mental 70 PRACTICAL GASTROENTEROLOGY • DECEMBER 2014 Clinical Observations Correcting Hypernatremia: Enteral or Intravenous Hydration? NUTRITION ISSUES IN GASTROENTEROLOGY, SERIES #137 In many cases, it is important to recognize that the free CASE 2 water deficit may be great and along with continuing A 72 year-old male admitted to the intensive care unit water losses (insensible losses), the replacement rates (ICU) with sepsis developed severe diarrhea due to can be substantially greater than 1-2 liter per day. When Clostridium difficile colitis. He is receiving enteral replacement rates are greater than 1 liter in a 24 hour nutrition, but due to ongoing diarrhea and fluid losses period, administering water replacement only via the he became hypernatremic. The patient was prescribed gastrointestinal route may prove challenging as the 400mL of water every 3 hours to replace the water following cases highlight. deficit. With this increased fluid delivered enterally, he vomited leading to a change to IV water replacement. CASE 1 46 year-old female who is post-repair of a congenital Practical “Water Replacement” heart defect is now requiring mechanical ventilation. A The GI tract is normally capable of handling a large percutaneous gastrostomy (PEG) tube is in place and amount of fluids and solute/nutrient administration. the patient is tolerating enteral nutrition (EN) with a However, in the setting of critical illness or serious GI daily volume of 1400 ml of enteral formula. Over the problems (gastroparesis, etc.), this capacity for water past few days, she has become hypernatremic and the and nutrient adsorption may be compromised and lead care team increased her water flushes to 300mL every 4 to increased abdominal distention, discomfort and the hours (1800mL per 24 hours) to address her estimated risk for nausea/vomiting and aspiration events. Water water deficit. Thus, in total, she was receiving 3200 given the enteral route vs. the intravenous route is ml of fluid enterally per day. In this case, she became equally as effective; however there may be practical quite uncomfortable and given this concern as well as limitations to the use of the GI tract especially when concerns for gastric distention and risk for aspiration, replacement volumes are greater than 1000mL. On it was recommended she be given IV replacement of the other hand, IV water replacement is safe, reliable, her free water deficit and minimize enteral delivery to predictable, consistent, and avoids these complications. only tube feeding and necessary medications until the distension resolved. Two days after the switch to IV Oral versus IV Hydration free water replacement, her abdominal distention had If the clinician is contemplating oral hydration, it resolved. is important to assess the ability of the GI tract to accommodate and absorb the additional fluid load. This Table 2. Etiology of Hypernatremia is especially true if the patient is already receiving EN and the additional volume with hydration may prove • Extra-renal water losses (profuse sweating) intolerable. Certainly, if a patient is having trouble tolerating EN at the outset, then IV hydration should • Renal losses (osmotic diuresis) be the route of choice. Other key questions that need to be asked before utilizing enteral hydration include: • High-protein intake 1. Will enteral solutions be held for periods of time (such as for procedures, lost access)? • Lithium administration 2. Does the patient have impaired GI motility? • Vasopressin receptor antagonists 3. Is the patient constipated? 4. Is the patient at risk for aspiration that could be • High urine output that is hypotonic to plasma. worsened
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