Purpose: Wearing face masks during the COVID-19 pandemic has become a very important hygiene measure to block or prevent respiratory droplets and infections. The purpose of this study is explore effect wearing on acoustical measurement voice speech in patients with hyperfunctional disorders, present guidelines for mask when evaluating speech.Methods: A total 20 disorders who diagnosed vocal nod...

The filtration performance of three types commercially available face masks (hygienic, surgical, and FFP2) has been evaluated for aerosol particle size in the range 10–150 nm at a fixed velocity 9.5 cm/s. Two parameters have varied this study: time use mask, electrical charging state particles. Mask aging carried out by wearing it prescribed period time. Four different states NaCl particles gen...

Face masks are currently considered key equipment to protect people against the COVID-19 pandemic. The demand for such devices is considerable, as amount of plastic waste generated after their use (approximately 1.6 million tons/day since outbreak). Even if sanitary emergency must have maximum priority, environmental concerns require investigation find possible mitigation solutions. aim this wo...

Facemasks and respirators are important components of personal protective equipment for health care workers in hospitals and public civilians during severe hazy conditions or influenza pandemic. The efficacy of protection of facemasks and respirators is of importance as they filter fine airborne particles from reaching the respiratory system and prevent interindividual infection. The protective...

laryngeal mask is a supraglothic instrument for ventilation of patients who are under anesthesia. insertion of laryngeal mask requires maintaining sufficient depth of anesthesia to avoid airway reflex (gagging, coughing and spasms). the present study investigated two techniques of anesthesia with propofol-atracurium and thiopental-atracurium to facilitate insertion of the laryngeal mask, term o...