Relationship between the Clinical Characteristics and Intervention Scores of Infants with Apparent Life-threatening Events

Clinical Characteristics and Outcomes of Patients Admitted with Brief Resolved Unexplained Events to a Tertiary Care Pediatric Intensive Care Unit

The aim of this study was to determine outcomes of patients admitted to a tertiary care pediatric intensive care unit (PICU) with brief, resolved, unexplained event (BRUE), and to review the diagnostic and treatment options utilized for such patients. A retrospective data analysis was conducted for infants and children who were admitted to the PICU at a tertiary hospital with a diagnosis of BRUE over a period of three years (2015-2017). The study included 30 infants, 15 males, and 15 females. All patients survived to hospital discharge. The most frequent presenting symptoms and signs were apnea (73.3%), cyanosis (60.0%), and cough (20.0%). The most frequent reported affected systems were respiratory (33.3%), gastrointestinal (20%), and infection-related illness (20.0%). We conclude that the careful history taking, complete physical examination, and the appropriate workup for patients with BRUE play an integral role in optimum health service and utilization of critical care beds. Survival to hospital discharge with no serious in-hospital events warrants the adaptation of evidence-based medicine guidelines to stratify such patients based on the risk of recurrence or a serious underlying condition. Prospective multicenter studies are recommended to explore the effectiveness of such guidelines implementation on outcomes and diagnostic testing in such patients to optimize the utilization of the limited critical care beds.

Etiology and Outcome of Severe Apparent Life-Threatening Events in Infants

INTRODUCTION

An apparent life-threatening event (ALTE) is defined as "an episode that is frightening to the observer and is characterized by some combination of apnea, color change, marked change of muscle tone, choking, or gagging."

OBJECTIVE

The aims of this study were to determine etiology and outcome of severe ALTE (requiring resuscitation measures) and to review diagnostic approaches in infants hospitalized after such an episode of ALTE.

METHODS

Retrospective analysis included patients hospitalized at the Intensive Care Unit, Institute of Child and Youth Healthcare of Vojvodina, after an episode of severe ALTE over a 4-year period.

RESULTS

The study included 23 infants, 18 male (78.3%), and 5 female (21.7%). The average age at presentation was 78 days (1 day to 11 months). In 8 infants (34.7%), ALTE resulted in death. The most frequent conditions after diagnostic evaluation were lower respiratory tract infections (39.1%), intracranial and extracranial hemorrhages (13.0%), and central nervous system infections (8.6%). The cause remained unknown in 8.7% of cases. Initial investigations included complete blood cell count, C-reactive protein or procalcitonin, blood gasses, lactate, electrolytes, glucose, blood culture, urinalysis, and chest x-ray.

CONCLUSIONS

Apparent life-threatening event represents a diverse disorder. Lower respiratory tract infections and neurological disorders were the most common established etiology. Prematurity and congenital heart diseases stood out as important risk factors. Diagnostic evaluation varied according to suspected cause and trigger factors.

Apparent life-threatening event in infancy

An apparent life-threatening event (ALTE) is defined as the combination of clinical presentations such as apnea, marked change in skin and muscle tone, gagging, or choking. It is a frightening event, and it predominantly occurs during infancy at a mean age of 1–3 months. The causes of ALTE are categorized into problems that are: gastrointestinal (50%), neurological (30%), respiratory (20%), cardiovascular (5%), metabolic and endocrine (2%–5%), or others such as child abuse. Up to 50% of ALTEs are idiopathic, where the cause cannot be diagnosed. Infants with an ALTE are often asymptomatic at hospital and there is no standard workup protocol for ALTE. Therefore, a detailed initial history and physical examination are important to determine the extent of the medical evaluation and treatment. Regardless of the cause of an ALTE, all infants with an ALTE should require hospitalization and continuous cardiorespiratory monitoring and evaluation for at least 24 hours. The natural course of ALTEs has seemed benign, and the outcome is generally associated with the affected infants' underlying disease. In conclusion, systemic diagnostic evaluation and adequate treatment increases the survival and quality of life for most affected infants.