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Neurogenic hyperpyrexia following acute traumatic spinal cord injury. A Systematic Review

Panagiotis Korovessis

Chief and Chair, Orthopaedic Department, General Hospital, Patras Greece

DOI: 10.15761/CRT.1000264

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Abstract

Study Design: Systematic review.

Objective: To report the incidence, pathogenesis, treatment options and outcomes related to neurogenic hyperpyrexia following acute traumatic spinal cord injury (SCI).

Methods: A systematic review was performed on hyperpyrexia secondary to acute traumatic SCI in adult patients. A literature search was performed using PubMed and available literature.

Results: Using the headings terms “Spinal Cord Injury” and “Fever” and after removing duplicates, 292 articles were collected independently of the number of cases included. Papers with fever of other etiology than neurogenic hyperpyrexia were subsequently excluded. In this last search 9 original articles were selected, from which only 4 fulfilled the criteria for this systematic review. Cervical was much more often than thoracic SCI associated with hyperpyrexia. Although the incidence of fever of all origins after SCI averaged 50.5%, (range 22.5 to 71.7%) the incidence of neurogenic hyperpyrexia in patients sustained acute SCI averaged 8.0%, (range 2.6 to 27.8%). ASIA A SCI had a higher incidence of hyperpyrexia than ASIA B to D incomplete SCI injuries. The pathogenesis of so-called “neurogenic hyperpyrexia” following reported acute SCI is not thoroughly understood, and mostly cases have been. Few methods for treatment of hyperpyrexia have been suggested including steroids, cooling, combined steroids and hypothermia and endovascular cooling

Conclusion: Neurogenic hyperpyrexia is a relatively common clinical entity following acute SCI. However, there is little literature to help physicians prevent or treat this potential fatal condition. Further studies with larger sample sizes, focusing on incidence rate, clinical outcomes, and pathogenesis of neurogenic hyperpyrexia following acute traumatic SCI are needed. The results of this systematic review that are based on very few clinical studies suggest further research with controlled clinical trials. 

Key words

spinal cord injury, hyperpyrexia, pathogenesis, treatment

Introduction

Spinal cord injury (SCI) is often devastating for the quality of life in injured individuals. While contemporary treatment of SCI, that includes both operative and rehabilitation has lessened its associated morbidity and mortality, there remains place for improvement of outcomes.[1]

Fever during hospitalization of patients with orthopaedic diseases is not uncommon, however hyperpyrexia, is rather rare. Among the causes of hyperpyrexia are malignant neuroleptic syndrome, cholinesterase deficiency, drug fever and central fever. [2,3] The common non-infectious causes should always be excluded and fever due to SCI or QUAD fever may be considered. The pathogenesis of QUAD fever is unclear but it could be attributed to autonomic dysfunction and temperature dysregulation.

The objective of this review was to report on the incidence of and the possible pathogenesis of hyperpyrexia associated SCI, or QUAD fever, the clinical outcomes and consequences of Quad fever of neurogenic origin in acute traumatic cervical and upper thoracic spinal cord injury as well as the applied treatments.

Methods

Study Search

A systematic review of the literature on hyperpyrexia and SCI was performed using PubMed (MEDLINE). No restrictions were placed on publication date and language. Utilizing PubMed, the following Medical Subject Headings terms were entered: “Spinal Cord Injuries”, and “Fever”. After removing duplicates, 292 articles were collected in the period from 1899 to 2019. Since in these articles, there were papers with fever of other etiology than neurogenic hyperpyrexia, an additional search was made with the following terms in the same database: “spinal cord injury,” “hyperpyrexia”. In this last search 9 original articles were selected, from which only 4 fulfilled the criteria for this systematic review (Figure 1).

Figure 1. Allocation chart

Inclusion and Exclusion Criteria

The primary requirement for inclusion was the description of one or more cases of a hyperpyrexia episode > 40.8oC of unknown etiology following SCI. For the purposes of this review, we focused on the reports that defined a hyperpyrexia. Cases that presented unidentifiable fever after SCI in addition to other associated events were included. Only four results were found that met our inclusion criteria. Studies including pediatric cases (<18 years of age) were excluded.

Definition and Pathology

In a SCI patient, neurogenic fever that is rare, may be due to ‘‘quad fever’’ that is an extreme elevation in body core temperature > 40.8o C with uppermost reported limit 44.8°C [4]. in a patient with acute SCI. [5].

Patients with high cervical SCI are at “high risk” for development of hyperpyrexia. These patients are frequently quadriplegic, although rarely it has been described in the paraplegic with a mid-level or higher thoracic spine injury [6,7].

In severe SCI, the primary injury damages spinal cord neural tissue, causing loss of neurological function below the level of cord lesion but not rarely leaves areas of intact cord intact as in incomplete SCI. A secondary autodestructive process [8] follows with hemorrhage and increasing edema, leading to infarction of cord tissues. This aggravates spinal cord damage and further impairs neural transmission [9,10]. Researchers believe that if this secondary spinal cord damage could be arrested, the chances of functional neurological recovery could be enhanced [4]. These cases with SCI usually have no identified cause of hyperthermia other than the autonomic central neurogenic dysfunction.

Severe autonomic dysfunction can result in thermodysregulation, as well as neurogenic shock, cardiac arrhythmias, orthostatic hypotension, autonomic dysreflexia, and hyperhidrosis [8]. Patients with quadriplegia, who developed hyperpyrexia, have historically fatal outcome. Although antipyretics are commonly used to treat fever of different etiologies and are generally efficacious, they are ineffective in treating the hyperpyrexia seen in this severe autonomic thermodysregulation [8-10].

Hypothalamus autonomically controls body temperature [2,7], in order the central regulatory centers to maintain body temperature within normal limits by utilizing cooling mechanisms to counteract endogenous heat production [11]. When patients suffer from upper cervical SCI, the regulatory centers may be disrupted, resulting in a pathophysiological response to temperature control [5]. Also, reduced blood flow to the brain, a side effect of hyperpyrexia itself, can damage central homeostatic mechanisms, further compromising the efficacy of cooling processes [12-14]. These effects can result in excessive heat production and increased body temperature.

Cellular damage has been documented to occur upon exposure to temperatures of 40–41.8C. The effects include protein denaturation, growth inhibition, and alterations in signal transduction [12]. Hyperthermia has known effects on normal organs including lesions in the central nervous system, kidney, heart, liver, and bone marrow. Systemic effects include coagulopathy,

hypovolemia, acute tubular necrosis, abnormal liver enzymes which may progress to severe liver necrosis, brain edema, extensive neuronal loss and gliosis, and intraparenchymal haemorrhage in the adrenal gland. Haematological effects include bone marrow suppression resulting in thrombocytopenia, as well as intravascular hemolysis [12,14].

Treatment in hyperpyrexia patients with SCI

Steroids: In last few years there was enthusiasm in the literature for the beneficial effects of parenteral steroids following SCI in animals and more recently this beneficial effect was justified in humans [15-24]. However, some researchers supported that the evidence for use of steroids in SCI was weak [25,26] Steroid administration, was considered a treatment of choice for human SCI and, extending over a decade (1977-1987), steroids were widely used. [27] The dosing regimen of dexamethasone used here was developed using information from earlier laboratory studies, [28,29] which showed that its administration preserved intracellular potassium, reduced tissue damage, and was correlated with better neurological recovery. Based on previous laboratory studies, some authors administered steroids to their patients with SCI and hyperpyrexia for 11 days with subsequent cessation of fever on the 18th day [20].

Cooling: Cooling the injured spinal cord to enhance recovery of neurological function has got increased clinical (humans) and investigative (animals) interest by the researchers [30,31]. Beneficial effects of cooling on the injured spinal cord in animals was supported by several authors. [17,32-43] The authors of a review, [31] showed that local spinal cord cooling had been used in patients with neurologically complete (ASIA A) SCI.

The authors of a recent prospective clinical study [44] performed on the basis of a protocol a combined approach with intravenously administrated steroids, decompressive surgery, and local cooling of the injured spinal cord, targeting to preserving as much as possible viable neural tissue and subsequently at least theoretically improving functional recovery in patients with complete SCI . The authors reported that the combined treatment offered these tetraplegic patients better recovery than might have been expected had decompression alone with/without steroids had been used [44].

The benefit of steroid treatment for SCI has been debated in the last decade, but these authors [44] supported that research into the effects of cord cooling should be expanded. Given that the optimal neuroprotective temperature after acute trauma has not yet been defined, and may well be below that which is considered safely approachable through systemic cooling, methods that allow for the early attainment of such a temperature locally should be further explored. 

Combined steroid and hypothermia: Several papers reported in the subject “cooling” the spinal cord following acute SCI to enhance recovery of neurological function. Beneficial effects of local spinal cord cooling were shown in experiments [32-34,37,38-43] and patients with complete SCI [40,45,46] Combined steroid and hypothermia therapy was administered to 51% of patients.[40] The rate of neurological improvement in some form was 54%, the ambulation rate was 14%, and the 1-year mortality rate was 13%. was administered to 51% of patients. [40] The rate of neurological improvement even little in some form was 54%, the ambulation rate was 14%, and the 1-year mortality rate was 13%. [40]

In a recent review, [44] the investigators felt that spinal cord cooling could be beneficial in the treatment of the injured spinal cord but that the optimal cooling temperature might be lower than what is feasible through systemic hypothermia. The authors used local spinal cord hypothermia, [44] allowing for more profound selective cooling of injured tissue while avoiding potential complications of deep general hypothermia. An equipment for localized extradural cord hypothermia has been developed by others.[47]

 In a study of delayed cooling in animals (dogs), the investigators [44] showed that the best motor recovery occurred in dogs, whose traumatized spinal cords were cooled for a duration of 4 hours instead of 1-18 hours. [47] The same group of researchers also showed that after severe SCI, combining steroid agents and local spinal cord cooling at a central cord temperature of around 17°C produced better neurological motor recovery than conservative treatment or the single use of either.[48]

A 2008 literature review noted that “local hypothermia was actively studied already in the 1970s in human acute traumatic SCI, but no case series of this intervention has been published since 1984.[49] Late recovery following spinal cord injury may be expected , therefore it is meaningful, that the long follow-up is relevant because recovery after SCI may occur years after the injurious event. [50]

Endovascular cooling: The use of endovascular cooling in the management of severe life threatening hyperthermia in patients with cervical SCI may be an useful intervention [51].

Discussion

A frequency of neurogenic fever is approximately one per 20- 25 patients who sustain an acute SCI; however, despite the relative frequency of this condition, there is little in the scientific literature to help physicians prevent or treat it. Several case reports have presented the hyperpyrexia that associates acute spinal cord injury, while there are few reports on the differential diagnosis of fever of different pathologies in patients with acute SCI. 

Following high cervical SCI, the resulted autonomic dysfunction may be manifested as thermodysregulation. There are 3 categories of thermodysregulation [52]. Poikilothermia is the best known in the first category, which is related to hypothermia resulting from prolonged cold exposure. The second category includes ‘‘quad fever,’’ which refers to fever without an infectious basis that appears in the first several weeks to months after cervical SCI. The third is exercise-induced fever. All these three conditions may have devastating and lethal sequelae for the patient [53,54]. 

 “Malignant hyperthermia” that is a rare fatal genetic disorder in which patients develop elevated body temperature, increased muscle metabolism, muscle rigidity, rhabdomyolysis, acidosis, and cardiovascular instability and is linked with certain anesthetic agents [55]. 

Sugarman [56] described quad fever in individuals with tetraplegia and occasionally in those with high paraplegia. Quad fever is defined as an early phenomenon in patients with incomplete cervical SCI. These patients had fever that often exceeds 40oC, fever that is encountered later in their courses. Physicians should be aware that Quad fever is considered only after all infectious or inflammatory causes have been ruled out. 

Fever that occurs because of hyperthermia is often characterized by an elevation in body temperature at levels above 37.7°C [49,57,58]. In patient’s wo are staying in the intensive care, fever is associated with poor outcome in up to 70% of the patients with or without bacterial infections. The most important noninfectious causes of severe hyperthermia are heat stroke, malignant hyperthermia, neuroleptic malignant syndrome, thromboembolism, thermoregulatory dysfunction, and medication-related fever, which are caused by failure of thermoregulation. These situations are often associated with severe systemic complications and finally death [55,56]. 

Thyrotoxicosis may also cause increased thermogenesis [59], When fever is associated with SCI, hyperpyrexia occurs at any period e.g. during the acute phase following trauma, during the hospital stay, or after discharge [58]. 

In a systematic review, Savage, et al. reported a fever of any reason in patients with SCI ranging from 22.5 to 71.7%, while the reported incidence of neurogenic fever was significant lower ranging from 2.6 to 27.8% [60].

 The same review showed that cervical and thoracic spinal cord injuries were more commonly associated with fever than lumbar injuries. In addition, complete injuries had a higher incidence of fever than incomplete injuries [60]. 

Colachis, et al. Otis reported that all patients suffering from SCI at the levels T4–T6 that corresponds to the major splanchnic sympathetic plexus resulted in autonomic dysregulation[49], and thus these patients with traumatic upper thoracic and cervical SCI are also more susceptible to core body temperature changes from alterations in the external environment [49]. This latter is important for predicting and anticipating patients who may be at high risk for thermodysregulation. 

Neurogenic shock is a form of distributive shock that involves loss of peripheral vasomotor control especially noticeable in cervical injuries [61]. A decrease in vascular resistance is associated with vascular dilatation and pooling of blood in peripheral vascular beds. Also, loss of sympathetic vascular tone causes warm, dry skin and bradycardia after cervical SCI. Plasma volume expansion is the mainstay therapy in these patients. The amount of fluid administered is based on improvement of clinical signs, particularly blood pressure, pulse pressure, and heart rate. Central venoupressure and urinary output also provide indications of restoration of vital organ perfusion but only at the macrocirculatory level. Fluid resuscitation eventually restored global hemodynamic parameters; however, restoration of microcirculation might have been inadequate. On the other hand, inflammation has a significant pathophysiologic role in renal ischemia and reperfusion injury. Also, fever is an important manifestation of inflammation. 

There are several mechanisms by which targeted temperature management may improve neurological outcome when used after reperfusion. Hypothermia reduces the cerebral metabolic rate for oxygen (CMRO2) by 6% for every 1°C reduction in brain temperature > 28°C. This effect is partly due to reduced normal electrical activity [62]. Targeted temperature management is thought to suppress many of the chemical reactions associated with reperfusion injury. These reactions, as mentioned previously, are associated with hyperpyrexia and include free radical production, excitatory amino acid release, and calcium shifts, which can in turn lead to mitochondrial damage and apoptosis. Hypothermia attenuates pro-apoptotic signals, such as cytochrome c release, Fas and Bax up-regulation, and caspase activation and activates anti-apoptotic mechanisms, such as the Erk1/2 pathway and the Akt pathway [63].

Hyperpyrexia, following SCI can potentially compromise functional outcome and exacerbate tissue damage. Accordingly, steps should be taken to prevent detrimental hyperpyrexia following SCI [64].

In ICU patients, single fever episodes ranging from 38.9°C to 41.1o C that disappears spontaneously within 24 hours are almost always noninfectious in nature and are most commonly caused by blood/blood products transfusion, insertion/removal of devices, or manipulation of a colonized/infected mucosal surface [65]. Some clinical studies showed that hospital-acquired sinusitis is a frequent cause of fever with unknown origin in patients with orotracheal intubation and critically ill patients on mechanical ventilation [66]. In addition, sputum production is increased in patients with cervical SCI [67].

Patients with cervical SCI are prone to atelectasis, especially at the basal side of their lungs, that subsequently may cause fever, especially in the early postoperative period. However, such extremely high temperatures in these patients could not be explained solely by atelectasis [68,69]. Twenty-eighty percent of the patients admitted suffering from acute cervical SCI had fatal complications caused by persistent hyperthermia of unknown origin [70]. Fever is associated with poor outcome in up to 67% of ICU patients with or without infection [71].

A literature review revealed very few reports of quad fever and its pathophysiologic mechanisms are poorly understood.

Therapeutic hypothermia protocols are utilized to induce lower body temperatures after cardiac arrest for neuroprotection, and to treat intractable intracranial hypertension.

However, a hypothermic protocol is not routinely used to treat hyperpyrexia. Literature search revealed only one previous study where an external cooling device was used to achieve normothermia in a hyperthermic patient [11].

Although the protocol was successful in inducing lower body temperatures via this noninvasive device, it was not used to treat ‘‘quad fever,’’ but rather neuroleptic malignant syndrome.

There is one report of two cases which used an invasive endovascular cooling device to treat ‘‘quad fever.’’ In one of the cases, the device normalized the patient’s body temperature within 5 h, but the patient later died as a result of catheter related deep vein thrombosis, a complication known to occur

with invasive intravenous cooling devices. In the second patient, the cooling device was unsuccessful in controlling body temperature [72].

Conclusively, before a diagnosis of neurogenic hyperthermia can be made, a detailed systematic search for infection and other febrile causes local as abscesses, osteomyelitis etc., and systematic as urinary, blood etc. and noninfectious causes deep vein thromboses, pulmonary emboli, should be undertaken and rule out. It was reported that although an extensive methodology is undertaken, neurogenic fever is likely to remain a diagnosis by exclusion [73]. Awareness of this little known condition could help in avoiding unnecessary antimicrobial therapy and in more accurate prognostication

The paucity of research underscored by this review demonstrates the need for further studies with larger sample sizes, focusing on the incidence rate, clinical outcomes, and pathogenesis of neurogenic fever following acute traumatic SCI.

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Editorial Information

Editor-in-Chief

Article Type

Review Article

Publication history

Received date: June 03, 2019
Accepted date: June 12, 2019
Published date: June 17, 2019

Copyright

©2019 Korovessis P (2019) This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Citation

Korovessis P (2019) Neurogenic hyperpyrexia following acute traumatic spinal cord injury. A Systematic Review. Clin Res Trials 5: DOI: 10.15761/CRT.1000264

Corresponding author

Panagiotis Korovessis

Chief and Chair, Orthopaedic Department, General Hospital, Patras Greece

E-mail : bhuvaneswari.bibleraaj@uhsm.nhs.uk

Figure 1. Allocation chart