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Critical Care and Resuscitation • Volume 11 Number 2 • June 2009 151 POINTS of VIEW

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Critical Care and Resuscitation • Volume 11 Number 2 • June 2009 151 POINTS of VIEW POINTS OF VIEW Mannitol or hypertonic saline for intracranial hypertension? A point of view Luis B Castillo, Guillermo A Bugedo and Jorge L Paranhos Osmotically active solutions have been used for more than ABSTRACT 30 years in the treatment of intracranial hypertension. The traditional agent of choice has been mannitol, but hyper- Osmotically active solutions, particularly mannitol, have tonicCrit saline Care has Resusc recently ISSN: emerged 1441-2772 as an1 Junealternative. Here, been used for more than 30 years in the treatment of we discuss2009 11 the2 151-154 systemic and cerebral effects of these two intracranial hypertension. Recently hypertonic saline has ©Crit Care Resusc 2009 substances,www.jficm.anzca.edu.au/aaccm/journal/publi- as well as their side effects and complications, emerged as an alternative to mannitol. Both solutions are and cations.htmmake recommendations about their clinical use. used worldwide, and their indications and long-term side Points of View effects are well known. More recently, knowledge about their effects has increased, both limiting and expanding Mannitol their clinical use. Here, we compare the systemic and Mannitol has been the agent of choice in osmotherapy for cerebral effects of mannitol and hypertonic saline, as well as cerebral injury since the 1960s. It is a mannose-derived their side effects and complications. Finally, we make simple alcohol, which is easy to prepare and use, stable in recommendations about their clinical use. solution, inert, not metabolised, freely filtered by the kidneys without being reabsorbed, and low in toxicity. Its Crit Care Resusc 2009; 11: 151–154 distribution volume corresponds to the extracellular com- partment.1-7 The effects of mannitol on the central nervous For editorial comment, see page 94 system have been well described, but the mechanisms are still not completely understood. flow. These effects have been described for the cerebral Rapid administration of a 15%–20% mannitol solution circulation, and are transient and based on a rise in capillary produces similarly rapid effects, reaching maximum inten- volaemia, a feature which distinguishes mannitol from sity after 30–45 minutes, and returning to baseline after 2– other osmotically active molecules, such as urea and glyc- 12 hours.8 Osmolarity is increased by 15–25 mOsm/L.9-11 erol, that are no longer used clinically.8,18,19 The blood–brain barrier reflection coefficient is about 0.912-16 (Box 1). The systemic and cerebral effects are due to Effects on intracranial pressure circulatory, diuretic and rheological mechanisms. Mannitol reduced intracranial pressure. Nevertheless, its Circulatory effects dual and paradoxical effects are also well known, especially in the presence of significant damage to the blood–brain An acute infusion of 15%–20% mannitol solution induces barrier. In this context, there is an extremely high risk of an increase in cardiac output and filling pressures, and a producing a paradoxical “reverse” osmotic gradient, which sharp but temporary increase in arterial pressure and will then lead to delayed increases in intracranial pressure as cerebral perfusion pressure.17 Cardiac output rises up to described below.20-22 In one clinical study, mannitol gener- about 30%, increasing cerebral blood flow. Several studies ated only a 25% initial decrease in intracranial pressure.23 show that mannitol strongly affects systemic vascular resist- Clinical and experimental studies show that, after injecting ance because of its rheological effects. This increases a 15% mannitol solution, intracranial pressure decreases by oxygen transport at systemic and cerebral levels.9 about 5 mmHg.17,24-26 In humans, cerebral perfusion pres- Diuretic effects sure generally improves after mannitol infusion.27 High The osmolarity of a 15% mannitol solution is 1200 mOsm/L. levels of osmolarity and natraemia attenuate these effects.28 Mannitol is not metabolised and is excreted unaltered by Water is extracted from areas of both ischaemic and healthy the kidneys. For each mannitol molecule, five water mole- tissue.29,30 cules are excreted. Its diuretic effect occurs about 30–45 However, clinical reports indicate that consecutive and minutes after intravenous infusion. repeated doses of mannitol in the setting of blood–brain barrier disruption may cause reverse osmotic gradients and Rheological or microcirculatory effects even increases in intracranial pressure, the so-called para- Mannitol is a free radical scavenger and has particularly doxical reverse osmotic gradient.29,30 Furthermore, in some strong microcirculatory effects, increasing capillary blood clinical situations, particularly in the presence of midline Critical Care and Resuscitation • Volume 11 Number 2 • June 2009 151 POINTS OF VIEW marked by a sharp increase in systemic arterial and Table 1. Osmolarity, blood–brain barrier reflection venous filling pressures, right and left ventricular end- coefficient (C-reflection) and typical dose of diastolic pressure and cardiac output. There is also a hypertonic solutions rapid rise in effective plasma volume and cerebral blood flow.38 Similarly, if plasma osmolarity is below 300 mOsm/ Osmolarity kg, high osmotic gradients are generated between Solution (mOsm/L) C-reflection Typical dose plasma and the interstitium, inducing systemic and Mannitol cerebral water extraction. The volume extracted is 15% 1150 0.9 0.5–2 g/kg directly proportional to the osmotic gradient generated. 20% 1400 0.9 0.25–2 g/kg After use of these substances, significant degrees of Saline natriuresis and polyuria are frequently observed,39 which 3.5% 1195 1.0 1.4 mL/kg may also further induce hyperosmolarity in patients with 7.5% 2560 1.0 1.2 mL/kg intracranial hypertension. 10% 3410 1.0 0.9 mL/kg 24% 8008 1.0 0.7 mL/kg Effects on intracranial pressure The clinical effectiveness of these hyperosmotic solutions in deviation, the uncontrolled use of mannitol may worsen reducing intracranial pressure has been known for many deviation because of rises in transhemispheric pressure years. However, the mechanisms responsible remain unclear gradients. These are secondary to reductions in intracranial and controversial. pressure that are greater in the healthy hemisphere than in The first hypothesis is that these substances reduce the the abnormal areas. This phenomenon been observed volumes of cerebral astroglial cells through increased activ- particularly in focal diseases,2 and occurs in the absence of ity of type 4 aquaporin water channels. However, a system- changes in average intracranial pressure.1,31 atic search of the literature showed that this mechanism is quantitatively insignificant. Published data are contradic- Clinical uses tory, particularly in the case of focal injuries, and in regard Mannitol is used to manage intracranial hypertension with to the relative effects of these solutions in both normal and preserved autoregulation and hypoperfusion flow patterns.3 injured areas.4,17,18 It is also used to manage neurosurgical emergencies with an Another hypothesis is based on the view that a sharp intracerebral mass amenable to evacuation, where surgery increase in circulating volume increases systemic arterial is planned within a brief period.31,32 pressure. If cerebral autoregulation is preserved, this increase causes cerebral vasoconstriction while reducing cerebral blood volume and, therefore, decreases intracranial Hypertonic saline solutions pressure.5,40 Hypertonic saline solutions with increasing concentrations The third hypothesis is that cerebral blood volume is were re-incorporated into patient care over 20 years ago, decreased because of improvements in brain rheological especially for resuscitation of patients with severe trauma status, which favour vasoconstriction. This implies a and haemorrhagic shock.16,33,34 decrease in intracranial pressure only if resistance and flow In the clinical and experimental setting, these solutions autoregulation is maintained.18 increase plasma osmolarity, with an effect comparable to The final hypothesis states that the osmotic effects of that of mannitol, causing a reduction in cerebral water hypertonic saline reduce the supra- and infratentorial cere- content secondary to a sharp increase in plasma sodium, brospinal liquid volume. Consequently, intracranial pressure an effect which persists for at least 18 to 24 hours.8,18,35-37 decreases.41 This is due to the fact that adequate levels of intracerebral water and circulatory stability are regulated and main- Effects on electrolyte balance tained in both the injured and uninjured hemispheres.4,36 Hypertonic saline induces a progressive increase in natrae- mia and osmolarity. However, severe hypernatraemic– Circulatory effects hyperosmolar states have been reported only when these With use of hypertonic saline solutions at progressively solutions have been used repeatedly, with sodium levels increasing concentrations (3%, 5%, 7.5%, 10% and > 160 mmol/L. Hypovolaemia and excessive use of hyperos- 23.5%), the osmolar load also rises gradually, whereas motic solutions favour hypernatraemic states, and exponen- the volume required decreases. Systemic effects are tially increase secondary effects.12,38 152 Critical Care and Resuscitation • Volume 11 Number 2 • June 2009 POINTS OF VIEW Clinical uses use of mannitol, we also suggest that hypertonic saline Hypertonic saline can be used for refractory intracranial solutions may be effective. hypertension as second-line therapy. In these cases, intrac- For patients with cerebral
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