Major complications of airway management: a prospective multicentre observational study

We conducted an observational study of serious airway complications, using similar methods to the fourth UK National Audit Project (NAP4) over a period of 1 year across four hospitals in one region in the UK. We also conducted an activity survey over a week, using NAP4 methods to yield an estimate for relevant denominators to help interpret the primary data. There were 17 serious airway complications, defined as: failed airway management leading to cancellation of surgery (eight); airway management in recovery (five); unplanned intensive care admission (three); and unplanned emergency front of neck access (one). There were no reports of death or brain damage. This was an estimate of 0.028% (1 in 3600) complications using the denominator of 61,000 general anaesthetics per year in the region. Complications in patients with ‘predicted easy’ airways were rare (approximately 1 in 14,200), but 45 times more common in those with ‘predicted difficult’ airways (approximately 1 in 315). Airway management in both groups was similar (induction of anaesthesia followed by supraglottic airway or tracheal tube). Use of awake/sedation intubation, videolaryngoscopy and high-flow nasal oxygenation were uncommon even in the predicted difficult airway patients (in 2.7%, 32.4% and 9.5% of patients, respectively). We conclude that the incidence of serious airway complications is at least as high as it was during NAP4. Despite airway prediction being used, this is not informing subsequent management.     

Digital imaging of the chest

During the past several years, image acquisition in nuclear medicine, computed tomography, ultrasonography, subtraction angiography, and magnetic resonance has been by digitization. Despite these advances, research in the development of digital imaging in conventional radiography has lagged behind. Although studies with a variety of digital techniques have been carried out on several fronts, we still do not possess a method that has captured the imagination of the majority of radiologists and other physicians to a point where it could replace conventional screen-film imaging. This article reviews the current status and general principles of the technology, focusing on the four digital radiographic techniques that have shown the greatest promise - film digitization, an image intensifier - based system, photostimulable phosphor plates, and a scanned projection system. The physical aspects of each of the four systems and the clinical results that have been reported to date, as well as the advantages and disadvantages of each system, are presented.     

Randomized controlled trials on treatment by homeopaths and self-treatment with homeopathic medicines: design and protocol

BACKGROUND AND OBJECTIVE: This study investigates (1) whether treatment by homeopaths is more efficacious than self-selected conventional health care and (2) whether self-treatment with self-selected homeopathic medicines is more efficacious than placebo in preventing childhood upper respiratory tract infections (URTIs). DESIGN: A four-arm randomized controlled trial involving two independent investigations, one open and pragmatic (evaluating the effect of treatment by homeopaths including homeopathic medicines) and one double-blinded (evaluating the effect of self-treatment with homeopathic medicine). PATIENTS: The planned sample size is 420 children below the age of 10, recruited by a postal invitation to all children diagnosed with URTIs when attending a casualty department in Trondheim, Norway. INTERVENTIONS: The children are randomly assigned to receive either (1) self-selected homeopathic medicine or placebo (270 patients), (2) treatment by one of four different homeopaths who could prescribe any homeopathic medicine (75 patients), or (3) waiting list control using self-selected conventional health care (75 patients). MAIN OUTCOME MEASURE: Total URTI symptom scores from patients' diary over 12 weeks. PLAN: The results of these two studies (available at the end of 2004) have the potential to provide information about the efficacy of treatment by homeopaths independently from the efficacy of homeopathic medicines in children with URTIs.