SIDE EFFECTS OF STEROID USE IN PATIENTS WITH TRAUMATIC SPINAL CORD INJURY

Objective: Indicate and identify potential complications in our unit associated with the use of steroids in patients over 16 years of age with traumatic acute spinal cord injury managed with NASCIS II, III scheme compared with patients with the same characteristics who did not receive this management. Methods: To conduct a research study with reports of cases and controls in patients over 16 years of age and with an established diagnosis of acute spinal cord injury, treated definitively in our unit, performing the comparison of evolutionary process between those treated with steroids and those who were not, based on the development of a data collection sheet with several variables.. The results were encoded, tabulated and analyzed. Results: A total of 30 patients were analyzed from January to December 2012 and it was found that 16% of the patients managed with the steroid scheme required admission to the intensive care unit, 40% developed hospital-acquired pneumonia, 17% had urinary tract infection, 3% progressed to respiratory failure and 20% of this group had gastrointestinal bleeding. Conclusions: It was concluded that steroid management is not a risk-free therapy and the recommendation is to make a direct assessment of the potential benefit to its use in relation to the possible complications that can ensue before choosing this option in patients with traumatic spinal cord injury.


INTRODUCTION
Spinal cord injury is usually defined as an injury that partially or completely impairs three main functions: motor, sensory and reflex activities, traumatic injuries being the most frequent.This type of injury has become increasingly common due to the advances in means of transport, as well as in urban communication routes, the development of large cities, and different high-risk occupations. 1,2hese spinal cord injuries are catastrophic events in patients' lives, and also have a high socioeconomic impact, both for the patient and for the centers where the patients receive medical care. 2,3tp://dx.doi.org/10.1590/S1808-1851201514010R127Coluna/Columna.2015;14(1):45-9 Spinal cord injury is primarily established a mechanical injury, followed by a secondary, prolonged stage of damage characterized by inflammation, ischemia, edema, damage to the cell membrane, electrolyte disturbances, and release of oxygen free radicals, with the latter leading to cell apoptosis. 4,5From a physiopathological perspective, they are distinguished by two distinct stages: Primary (mechanical) injury, in which it causes cell death in the area around the epicenter of the lesion, triggering a second stage in which a vigorous inflammatory reaction occurs in response to the primary injury, subsequently causing demyelization, tissue edema, and cell loss or irreversible cell death.][7] Initial treatment protocols for this type of injury have been standardized over time, with special emphasis on the use of steroids, especially methylprednisolone sodium succinate (MPSS), which is a corticosteroid that at pharmacological doses, is indicated in the treatment of disorders and conditions in which anti-inflammatory effects are required.This is due to its potent action as a glucocorticoid as it stimulates the enzyme synthesis necessary to mitigate the inflammatory response, suppressing the migration of polymorphonuclear leukocytes and reversing the increased capillary permeability, while producing effects on the immune system, causing lymphocytopenia, reducing immunoglobulin and the complement levels.It also attenuates the passage of immune complexes through the basement membranes, and depresses tissue reactivity to antigen-antibody interactions. 8In the spinal cord trauma per se, and generally speaking, its function is to act as an inflammatory mediator, limiting the release of free radicals and reducing lipid peroxidation with the subsequent side effects.
Several protocols have been widely used in patients with traumatic spinal cord injury, since its description during the eighties, specifically 1984, with the National Association Spinal Cord Injury Study (NASCIS) I trial in which 330 patients with acute spinal cord injury were randomized to receive either a 25mg or 250mg dose of MPSS every 6 hours for 10 days, after 100mg bolus with a 6-month follow-up of 54% of these patients, without evidencing significant differences as regards clinical improvement, yet with the presence of significant side effects.The results of a further trial, NASCIS II, were published in 1992.In this study, three different regimens were administered to three different groups.The first consisted of high doses of MPSS at 30mg/kg in bolus to be administered at 15 minutes and at the first hour, followed by 5.4 mg/kg/h infusion for the next 23 hours; the second group received the same regimen for 48 hours, and the last group received Naloxone 5.4 mg/kg in bolus followed by 4.5 mg/kg/h infusion for 23 hours with follow-up of 95% of the patients per year, showing elevated rates of complications ranging from pneumonia to myopathies in the groups treated with steroids.][11] This management was eventually recognized and used across several medical care centers and at highly specialized units in European countries, in the United States, and later on in the rest of the world as standard in the treatment of these injuries. 9However, over time it has been seen that management with steroids is not a risk--free therapy, [12][13][14] which has sparked intense debate as to its application, with different studies questioning whether it actually represents an advantage in nerve recovery that justifies exposing the patient to the possible side effects associated with this management.
In spite of what is described in the literature, this kind of therapeutic approach has become common practice in our field, without consciously considering the possible complications that could occur in patients.][17] It should be emphasized that patients who sustain a traumatic spinal cord injury are often the victims of high-energy injuries that generally also involve other organs and systems, determining a diagnosis of polytrauma, and that on multiple occasions require management in intensive care units, situations that make them more liable to suffer complications. 18,19Therefore we consider it essential to conduct a comparative study to determine whether those patients treated without steroids suffer the same kind of complications as those receiving steroids. 20,21he national incidence of spinal cord injuries in Mexico is estimated at approximately 18.1 per million inhabitants, occurring more frequently between the ages of 16-35 years (productive age) with an average age of 31 years.Comparisons with the United States yield similar results, with males being most affected. 223][24][25] This kind of injury requires immediate surgical care in most cases, with decompression and stabilization (either anterior and/or posterior) as applicable, and at the same time, most cases are treated with methylprednisolone sodium succinate, despite the controversy surrounding its administration.
The abovementioned therapeutic regimen is the reason why it is necessary to conduct a comparative study between those patients who were managed under one of the different NASCIS protocols and those who were not, since not only do these complications have important repercussions on the level of possible complications exhibited by patients, but they also require longer hospitalization times, requiring greater capital investments on patient monitoring and medical care.These same complications are also likely to remain as sequelae over extended periods of time, thus completing a cycle in which clinical treatment involves not just the spinal cord injury, but also the possible complications of the additional therapeutic approach, specifically therapy with MPSS.This is why it is essential to carry out a comparative study of the possible sequelae associated with the administration of this drug.
The Hospital de Especialidades Centro Médico Nacional de Occidente Lic.Ignacio García Téllez, where this study is being carried out, has the necessary resources to care for these patients, besides adequately qualified staff with intensive care, a ward, and intermediate therapies for close monitoring of patients who require it.At the same time, as it forms part of a federal health sector, it has access to appropriate medications for the administration of the NASCIS regimen, which consists of saline solutions + ampoules of methylprednisolone sodium succinate and continuous infusion pumps to complete the treatment at 24 or 48 hours as applicable.It also has staff trained in areas other than orthopedics, including internal medicine, pneumology, infectology, angiology, gastroenterology, and a large nursing staff qualified to administer drugs and provide special care to patients.
As this is a retrospective study, with information obtained from clinical records, the possibility must be considered that not all the required information may be available for inclusion of some patients in the study; therefore it may be a smaller sample than expected, and the results may be inconclusive in some cases.
The overall objective will be to point out and determine the possible complications, in our medical unit, associated with the use of steroids in patients over 16 years of age with acute spinal cord injury managed with the NASCIS II, III regimen, as compared to patients with the same characteristics who have not received treatment with steroids.The specific objectives will be to determine which type of complication is most prevalent in these and whether there is any difference between the control group and patients treated with MPSS.

MATERIAL AND METHODS
A case-control study design was drawn up for the patients in the period January 2012 to December 2013 with an established diagnosis of acute traumatic spinal cord injury, aged over 16 and treated definitively at our unit in the department of Traumatology and Orthopedics, considering only those patients who met the criteria for inclusion, exclusion and elimination, at the Hospital de Especialidades Centro Médico Nacional de Occidente Lic.Ignacio García Téllez, and making a comparison in the inpatient evolutionary process between those treated with steroids and those who were not, based on the preparation of a form which includes the patient's details, such as: clinical record, diagnosis, date of admission, date of discharge or death, level of injury, injury development time, surgical treatment requirement, monitoring and management requirement in intensive care, type of NASCIS regimen administered, whether the patient presented any of the variables described in the study (pneumonia, urinary infection, wound infection, unspecified infection at another site, respiratory failure, sepsis, pulmonary embolism, gastrointestinal bleeding), general observations and annotations.The results will subsequently be encrypted, tabulated and analyzed, taking into account the absolute and relative frequencies as well as the measures of association, and making a comparison between the two groups.
It should be mentioned that the hospital where this study is conducted is a tertiary care hospital, which therefore receives patients from various parts of the republic with different medical treatment regimens and evolution times.Therefore, it constantly receives patients with more than 8, 24, 48 and in some cases 72 hours of evolution without steroid therapy.This group of patients functioned as a control group, since they had, in accidental form, not been exposed to high doses of steroids.For the data collection, the variables to be analyzed are defined as described below: Nosocomial pneumonia: Nosocomial infection that affects pulmonary parenchyma 72h or more after the patient has been admitted to hospital without having the infection prior to admission, and with the following characteristics: 26 • Chest X-ray or CAT scan with the presence of infiltrate in parenchyma;

Inclusion criteria
• Fever above 38°C without another origin; • Leucopenia below 4,000mm 3 or leukocytosis above 12,000 mm 3 ; • Purulent sputum or change in sputum characteristics; • Cough or tachypnea; • Suggestive auscultation: crackles, rhonchi, wheezing; • Deterioration in oxygen exchange.Urinary tract infection: Infection of the urinary tract accompanied by fever, nausea, vomiting, low back pain, general malaise with the following characteristics: 27 • Urinalysis with the presence of nitrites and leukocyte esterase; • Positive urine culture.Surgical wound infection: A wound with the following characteristics: 28 • Which heals in the 30 days after surgery (if operated on); • Compromises skin and subcutaneous soft tissues upon incision, and may involve deep soft tissues (fascia and muscle); • Purulent drainage; • Isolation of microorganisms in fluid or tissue; • Spontaneous dehiscence of superficial or deep sutures; • Fever above 38°C; • Localized pain, irritability upon palpation of the area.Respiratory insufficiency (failure): Defined as the failure of respiratory system functions secondary to a failure in the exchange of gases: 29 • Blood gas analysis with alteration in the exchange of gases.Sepsis: Sepsis is defined as the presence of infection together with a systemic inflammatory response syndrome (SIRS), which are both defined by the presence of the following characteristics: 30 • Body temperature above 38°C or below 36°C; • Heart rate above 90 bpm; • Hyperventilation evidenced by respiratory rate above 20 per minute or PaCO2 below 32 mmHg; • WBC count above 12,000 or below 4,000 cells mm 3 with 10% of immature forms.Pulmonary Embolism: Total or partial obstruction of the pulmonary artery or its branches caused by clots, air bubbles, fat droplets, amniotic fluid, parasites or tumor cells with the following clinical characteristics: 31 • Cough, chest pain and/or hemoptysis; • Blood gas analysis with alteration in gas gradients; • Chest radiography with atelectasis or abnormalities in pulmonary parenchyma; • Electrocardiography with T-wave inversion at V1-V4 or signs of right overload (pulmonary p); • Positive D-dimer result; • Chest CAT scan with contrast defining presence of emboli in large vessels; • Pulmonary angiography positive for pulmonary embolism.Upper gastrointestinal bleeding: Presence of frank bleeding in emesis, as well as melena or coffee-ground vomiting accompanied by decreased hemoglobin, confirmed through esophagogastric endoscopy. 32

Information collection methods
A previously prepared form was used that includes the patient's details such as: clinical record, diagnosis (according to ICD-10), date of admission, date of discharge or death, level of injury, injury development time, surgical treatment requirement, monitoring and management requirement in intensive care, type of NASCIS regimen administered, whether the patient presents any of the variables described in the study (pneumonia, urinary infection, wound infection, respiratory failure, sepsis, pulmonary embolism, gastrointestinal bleeding), general observations and notes.This information will be obtained directly from the digital records of the VISTA system, which is considered an electronic record, as well as from the physical records of the patients selected for the protocol.Later on, it will be encrypted and tabulated using EPI INFO software as a work tool.

RESULTS
As shown in Table 1, a total sample of 30 patients was analyzed in the period January 2012 to December 2013.These patients were treated at the Orthopedic and Traumatology service of Hospital de Especialidades del Centro Médico Nacional de Occidente, Lic.Ignacio García Téllez of the spinal clinic, 27 (90%) males and 3 (10%) females, with ages ranging from 16-70 years and averaging 37 ± 16 years.The hospitalization times of the total sample ranged from one day to 42 days, with an average stay of 18 days ± 10 days.97% of the study population was submitted to surgical treatment.Of the total sample, 16 patients (53%) received steroid therapy while 14 patients (47%) did not; of those patients managed with a steroid regimen, 16% required intensive care, 40% developed nosocomial pneumonia, 17% had urinary tract infection, 3% developed respiratory failure and finally, 20% of this group had gastrointestinal bleeding.There were no reports of patients with pulmonary embolism or development of sepsis.In relation to the control group, it was detected that only 3% required intensive care management, 10% had urinary tract infection, and 33% had respiratory failure.There were no reports of

DISCUSSION
Based on the results of this study, it follows that patients with complete traumatic spinal cord injury who received steroid therapy were 5 times more likely to require treatment in an intensive care unit than those who did not; they also had 1.6 times higher development of urinary tract infections.Hospitalization times were longer in the study group than in the control group, resulting in higher economic investments in this type of patient at our center, taking into account that the daily cost of hospitalization is $6,377 MXN and the cost per day in the intensive care unit is $31,525 MXN, with a cost per surgical intervention of $28,370 MXN per episode.Extrapolating these data directly to the case of the patient with the longest hospital stay (42 days), this represents an investment of $267,834 MNX on the costs of hospitalization alone, according to our calculations, without considering the days on which the patient required intensive care, or the surgical interventions to which this patient was submitted.pneumonia, sepsis, pulmonary embolism or gastrointestinal bleeding.(Table 2) Finally, in relation to the degree of neurological involvement using the AMERICAN SPINAL INJURY ASSOCIATION (ASIA) scale, 77% of patients were classified as ASIA A, 13% as ASIA B and 10% as ASIA C.

Table 2 .
Frequency of adverse events related to the use and omission of steroids in patients with spinal cord trauma.