Muerte encefálica y donación en población infantil

BACKGROUND

Brain death is the irreversible cessation of intracranial neurologic function and is considered as the person's death. The objective of this study was to describe the characteristics of pediatric donors in the Hospital Central de Asturias from October 1995 to October 2002.

METHODS

We performed a retrospective and descriptive study of the dead children who were potential donors in the pediatric intensive care unit (PICU).

RESULTS

Of 43 dead children, 15 (34.9 %) were diagnosed with brain death. In four patients (family refusal in one, sepsis in two and brain tumor in one) there was no donation. In all patients, the diagnosis of brain death was based on clinical examination and electroencephalogram. Doppler ultrasonography and technetium-99m hexamethylpropyleneamineoxamine (Tc-99-HMPAO) scanning was also performed in three and nine patients respectively. The mean age of the donors was 8.1 years (range: 13 months-15 years). The male/female ratio was 3/1. The cause of death was multiple trauma in six children, brain hemorrhage in three, cardiac arrhythmias in three, lightning strike in one, diabetic ketoacidosis in one, septic shock in one and hypovolemic shock in one. The median interval between admission and brain death was 1.4 days (range: 3 hours-12 days). The time of organ support between brain death and donation was 8.4 hours (range: 6-13 hours). The most frequent complications after brain death were central diabetes insipidus in 90.9 % of the patients, hyperglycemia in 54.5 % and hypokalemia in 45.4 %. During support 72.7 % of the patients required inotropic aid.

CONCLUSIONS

In our PICU more than one-third of the dead children suffered brain death, and most became donors. The most frequent cause of brain death was multiple trauma. Coordination with the transplant team and the training of medical staff are important to achieve a high percentage of donations.

Evaluación de la calidad de los cuidados en la UCI a través de un plan de atención de enfermería informatizado

The computerized systems that are being implemented for the recording of the Nursing Care Plan may facilitate the performance of continuing follow-up of the care quality. This retrospective descriptive study has been performed in a polyvalent Intensive Care Unit with the following objectives: a) describe the evaluation of the care quality, performed through the computerized record of the Nursing Care Plan; and 2) compare this evaluation with that performed in 1998, when the Nursing Care Plan had not yet been computerized. In the 98 revised computerized Nursing Care Plans, corresponding to the same number of patients with a mean stay of 13.8 days, the following results were obtained. Artificial airway. 74 patients had an endotracheal tube with a mean stay of 5.4 days, 11 patients had a cannula tracheotomy (time period of 45.7 days); no events occurred. Central venous lines: 91 patients were carriers of 163 catheters, the mean presence time was 9.9 days; three with withdrawn due to obstruction, there was one accident withdrawal and two were self-removed. Arterial catheter: the total number of arterial lines, corresponding to 87 patients, was 101 with a mean presence of 6.7 days; 15 obstructions, six accidental withdrawals and four self-removals were recorded. Bladder catheter: 91 patients had a bladder catheter (mean presence 12.9 days); no event occurred. Nasogastric tube: 83 patients were carriers of 98 tubes (63 Salem type and 35 for nutrition), with a mean presence of 10.1 days; five were withdrawn due to obstruction, three accidental withdrawals and 40 self-removed (23 in one patient). Skin integrity: nine patients developed bedsores, eight grade II and two grade III, the mean stay was 26.6 days. No patients had an accidental fall. As study conclusions, it stands out that the preestablished standards for the evaluation of the care were achieved in most and the care quality is maintained in relationship with our 1998 study, remaining within a level considered as good.

[Intrahospital mortality after discharge from the ICU (hidden mortality) in patients who required mechanical ventilation]

BACKGROUND AND OBJECTIVE

Our goal was to determine the hidden mortality (HM) in patients who underwent an episode of mechanical ventilation (MV). We also analyzed the factors associated with an increase in the risk of hidden mortality.

PATIENTS AND METHOD

Prospective cohort study. Patients admitted to an ICU who required MV and who were monitored until their discharge from hospital. We performed a multivariate study with a logistic regression model including all the variables that were present in a univariate analysis p < 0.20.

RESULTS

Forty-one of the 215 patients who were discharged from the ICU died when they were admitted to hospital, which represents a hidden mortality rate of 19% (CI 95% 11%-27%). A mean period of 9 days elapsed between discharge from the ICU and patient's death, with 25% of patients dying within the first two days. Commonest cause of death was respiratory failure (37%). Factors independently associated with an increase in the risk of hidden mortality were (values expressed as adjusted odds ratio (CI 95%): age > 74 years 1.15 (1.01 to 1.26) (p = 0.02); APACHE II > 29 1.14 (1.01 to 1.27) (p = 0.04); reason for MV being coma 1.21 (1.07 to 1.37) (p = 0.002); reason for MV being cardiopulmonary arrest 1.28 (1.18 to 1.68) (p < 0.001); tracheotomy in ICU 1.31 (1.19 to 1.68) (p < 0.001) and stay in the ICU longer than 16 days 1.35 (1.01 to1.70) (p = 0.04).

CONCLUSIONS

An important number of patients discharged from the ICU after an episode of MV die in hospital. Risk factors associated with an increased risk of death in hospital identify a group of patients who, after excluding those with non-cardiopulmonary resuscitation orders, would possibly benefit from high surveillance or intermediate care units.

Trauma care systems in Spain

Trauma care systems in Spain are provided by the Nacional Health Service in a decentralized way by the seventeen autonomous communities whose process of decentralization was completed in January 2002. Its organisation is similar in all of them. Public sector companies of sanitary emergencies look after the health of citizens in relation to medical and trauma emergencies with a wide range of up to date resources both technical and human. In the following piece there is a description of the emergency response teams divided into ground and air that are responsible for the on site care of the patients in coordination with other public services. They also elaborate the prehospital clinical history that is going to be a valuable piece of information for the teams that receive the patient in the Emergency Hospital Unit (EHU). From 1980 to 1996 the mortality rate per 10.000 vehicles and the deaths per 1.000 accidents dropped significantly: in 1980 6.4 and 96.19% and in 1996, 2.8 and 64.06% respectively. In the intrahospital organisation there are two differentiated areas to receive trauma patients the casualty department and the EHU. In the EHU the severe and multiple injured patients are treated by the emergency hospital doctors; first in the triage or resuscitation areas and after when stabilised they are passed too the observation area or to the Intensive Care Unit (ICU) and from there the EHU or ICU doctors call the appropriate specialists. There is a close collaboration and coordination between the orthopaedic surgeon the EHU doctors and the other specialists surgeons in order to comply with treatment prioritization protocols. Once the patient has been transferred an entire process of assistance continuity is developed based on interdisciplinary teams formed in the hospital from the services areas involved in trauma assistance and usually coordinated by the ICU doctors. There is also mentioned the assistance registry of trauma patients, the ICU professional training in the ATLS and the future guidelines for trauma care in the ICU based on epidemiological studies carried out in both the North Spanish Group and the Southern one to promote development and improvement in several areas.

Bacterial filters in respiratory circuits: an unnecessary cost?

OBJECTIVE

To evaluate the efficacy of bacterial filters (BF) to decrease pneumonia associated with mechanical ventilation (MV).

DESIGN

Prospective, randomized study.

SETTING

A 24-bed medicosurgical intensive care unit in a 650-bed tertiary hospital.

PATIENTS

A total of 230 patients who needed MV for >24 hrs.

INTERVENTIONS

A total of 114 patients were ventilated with BF and 116 without BF.

MEASUREMENTS

Throat swab and tracheal aspirate were taken at the moment of admission and twice a week until discharge. We considered the following infectious events: pneumonia, respiratory infection, which comprises pneumonia or tracheobronchitis, and respiratory colonization-infection complex, which comprises respiratory infection or colonization. All infectious events were classified as endogenous or exogenous based on throat flora.

MAIN RESULTS

Both groups of patients (ventilated with and without filters) were similar in age, sex, Acute Physiology and Chronic Health Evaluation II score, diagnostic group, days of MV, and mortality. There was no difference in the percentage of patients who developed pneumonia (24.56% with BF and 21.55% without BF), respiratory infection (33.33% vs. 28.44%), or colonization-infection (42.10% vs. 43.96%). The number of infectious events per 1000 days of MV were also similar in both groups: pneumonia (17.41 with BF and 16.26 without BF), respiratory infection (24.62 vs. 21.48), and colonization-infection (36.63 vs. 36). There were also no differences in incidence of infectious events by MV duration. Likewise, we did not find any differences in the number of exogenous events per 1000 days of MV: pneumonia, 2.40 with BF vs. 1.74 without BF; colonization-infection, 4.20 vs. 4.05.

CONCLUSIONS

Bacterial filters in ventilation circuits neither reduce the prevalence of respiratory infections associated with MV nor decrease exogenous infectious events; thus, their usage is not necessary.

Persistence of intracranial diastolic flow in transcranial Doppler sonography exploration of patients in brain death

OBJECTIVE

The persistence of cerebral blood flow (CBF) in patients with whole brain death (BD) diagnosis is an unusual phenomenon. We describe patients with whole BD diagnosed despite persistence of intracranial blood flow on transcranial Doppler sonography (TDS).

MATERIALS AND METHODS

From January 2001 to December 2002, we reviewed the records of 11 patients. Etiology of BD was craniocephalic trauma in 2 cases, schemic cerebrovascular accident (CVA) in 4 cases, Hemorrhagic CVA in 3 cases, subaracnoid hemorrhage in 1 case, and acute hydrocephalus in 1 case. Six patients had a cerebral decompressive mechanism. In all patients, TDS was used to confirm BD after clinical diagnosis. Additionally, all patients underwent an electroencephalogram (EEG). In 3 patients cerebral angiography (CA) and in 2 others radionuclide angiography (RA) with Tc99m HMPAO were done.

RESULTS

All TDS studies showed persistent telediastolic positive flow in at least 1 artery. Because the TDS did not confirm the clinical diagnosis of BD, EEG tests were performed showing silence of bioelectrical activity. Those cases showed CA or RA results with a complete absence of CBF.

CONCLUSION

The TDS technique directly evaluates the intracranial but not the intracerebral circulation. For this reason, during the BD diagnosis for patients with previous decompressive techniques, it was possible to find persistence of intracranial telediastolic flow using TDS. In those cases, it is advisable to use other tests to confirm the clinical diagnosis of BD.