Reduction in tlequency resolving capacity of the auditory system due to spread of masking of frequency cornponents by neighboring frequency components degrades speech perception in cases of sensorineural hearing impairment. We have carried out experimental evaluation of splitting speech into two signals lby using a bank of critical band filters, in order to reduce the effect of spectral masking...

Inhalation or intravenous anesthesia along with controlled or assisted mask ventilation is frequently used for interventions with short duration in pediatric patients, especially in surgical centers with high turnover and when laryngeal mask airways do not fit. To achieve one-handed mask ventilation the anesthesiologist has to stand behind the head, and the mask is held with one hand against th...

reduction in the forced expiratory volume in one second after exercise was calculated using the pre-exercise value as the baseline value. Statistical significance was calculated with Student's paired t test. The study was approved by the research ethical committee of the Faculty of Medicine, Queen's University, Belfast. The table shows the percentage reduction in forced expiratory volume in one...

RATIONALE Medical masks are commonly used by sick individuals with influenza-like illness (ILI) to prevent spread of infections to others, but clinical efficacy data are absent. OBJECTIVE Determine whether medical mask use by sick individuals with ILI protects well contacts from related respiratory infections. SETTING 6 major hospitals in 2 districts of Beijing, China. DESIGN Cluster rand...

BACKGROUND The ProSeal is a wire-reinforced laryngeal mask airway with an additional drain tube that leads to the distal tip of the laryngeal cuff. The design should improve the seal with the larynx. METHODS The ProSeal and classic laryngeal mask airways were compared in 180 patients in a randomized crossover study. Patients were anaesthetized without neuromuscular blocking drugs. RESULTS T...

Face masks are used for many respiratory care applications, such as anesthesia, resuscitation, and aerosol therapy. In pediatric practice, particularly with infants and toddlers, aerosol therapy is usually administered by means of a small-volume nebulizer and face mask. Because of their convenience, speed of administration, versatility, dose accuracy, reproducibility, near-optimal mass median a...

Radio frequency interference (RFI) has been being a significant issue for global navigation satellite system (GNSS) users. An increasing number of satellites in multiple constellations enable users to use high mask angle antennas (HMAAs) to reduce RFI from terrestrial sources. This paper studies the optimal antenna mask angle that maximizes the suppression of RFI but still maintains the perform...

By the year 2000, the laryngeal mask will have been used in approximately 100 million patients worldwide. Currently, at least 30% of anaesthetised patients in the UK [1] and 20% of patients in the USA [2] are managed using the laryngeal mask. The popularity of the device stems from its ease of use, its role in the difficult airway and the advantages it offers over the face mask and tracheal tub...