Physical Properties of Sputum. Iv. Effects of 100 Per Cent Humidity and Water Mist

Dulfano, Mauricio J.; Adler, Kenneth B.; Veterans, O. Wooten

doi:10.1097/00132586-197312000-00023

Cited by 11 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has previously been shown that exposure of sputum to 100% relative humidity does not increase wet weight at 1 hour. 24 It is unlikely that deposition of water in the airway occurred at the temperature and relative humidity delivered during treatment, as there would have been no exchange of heat and moisture with the mucosa and the inspired gas did not contain aerosolised water. A ventilatory mode that combined inspiratory and expiratory pressure was chosen for this study as it has been shown to provide better unloading of the diaphragm than inspiratory support alone in patients with COPD.…”

Section: Discussionmentioning

confidence: 99%

Non-invasive ventilation assists chest physiotherapy in adults with acute exacerbations of cystic fibrosis

Holland

Denehy

Ntoumenopoulos

et al. 2003

Thorax

104

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Non-invasive ventilation assists chest physiotherapy in adults with acute exacerbations of cystic fibrosis

Holland

Denehy

Ntoumenopoulos

et al. 2003

Thorax

104

View full text Add to dashboard Cite

“…An in vitro study on the effect of relative humidity on the viscosity of bronchial mucus found a twofold decrease in viscosity when the relative humidity was 100% versus 60% (15). Water mist, produced intentionally or accidentally by several types of humidifiers, may be partly responsible for the beneficial effects of humidification, as mists have been found to reduce mucus viscosity (16) and to reduce the incidence of upper respiratory infections, cough, and rhinitis among children with recurrent upper respiratory illness (17).…”

Section: Direct Health Effectsmentioning

confidence: 99%

Indirect health effects of relative humidity in indoor environments.

Arundel¹,

Sterling²,

Biggin³

et al. 1986

Environ Health Perspect

242

172

View full text Add to dashboard Cite

A review of the health effects of relative humidity in indoor environments suggests that relative humidity can affect the incidence of respiratory infections and allergies. Experimental studies on airborne-transmitted infectious bacteria and viruses have shown that the survival or infectivity of these organisms is minimized by exposure to relative humidities between 40 and 70%. Nine epidemiological studies examined the relationship between the number of respiratory infections or absenteeism and the relative humidity of the office, residence, or school. The incidence of absenteeism or respiratory infections was found to be lower among people working or living in environments with mid-range versus low or high relative humidities. The indoor size of allergenic mite and fungal populations is directly dependent upon the relative humidity. Mite populations are minimized when the relative humidity is below 50% and reach a maximum size at 80% relative humidity. Most species of fungi cannot grow unless the relative humidity exceeds 60%. Relative humidity also affects the rate of offgassing of formaldehyde from indoor building materials, the rate of formation of acids and salts from sulfur and nitrogen dioxide, and the rate of formation of ozone. The influence of relative humidity on the abundance of allergens, pathogens, and noxious chemicals suggests that indoor relative humidity levels should be considered as a factor of indoor air quality. The majority of adverse health effects caused bLy relative humidity would be minimized by maintaining indoor levels between 40 and 60%. This would require humidification during winter in areas with cold winter climates. Humidification should preferably use evaporative or steam humidifiers, as cool mist humidifiers can disseminate aerosols contaminated with allergens.

show abstract

“…One study found that the humidification capacity of the anterior nose was reduced during rhinitis (13), and another study found a small decrease in the humidifying capacity of the nose among four subjects with atrophic rhinitis compared to 22 normal subjects (14). Water mist, produced intentionally or accidentally by several types of humidifiers, may be partly responsible for the beneficial effects of humidification, as mists have been found to reduce mucus viscosity (16) and to reduce the incidence of upper respiratory infections, cough, and rhinitis among children with recurrent upper respiratory illness (17). An in vitro study on the effect of relative humidity on the viscosity of bronchial mucus found a twofold decrease in viscosity when the relative humidity was 100% versus 60% (15).…”

mentioning

confidence: 99%

Indirect Health Effects of Relative Humidity in Indoor Environments

Arundel¹,

Sterling²,

Biggin³

et al. 1986

Environmental Health Perspectives

133

145

View full text Add to dashboard Cite

A review of the health effects of relative humidity in indoor environments suggests that relative humidity can affect the incidence of respiratory infections and allergies. Experimental studies on airborne-transmitted infectious bacteria and viruses have shown that the survival or infectivity of these organisms is minimized by exposure to relative humidities between 40 and 70%. Nine epidemiological studies examined the relationship between the number of respiratory infections or absenteeism and the relative humidity of the office, residence, or school. The incidence of absenteeism or respiratory infections was found to be lower among people working or living in environments with mid-range versus low or high relative humidities. The indoor size of allergenic mite and fungal populations is directly dependent upon the relative humidity. Mite populations are minimized when the relative humidity is below 50% and reach a maximum size at 80% relative humidity. Most species of fungi cannot grow unless the relative humidity exceeds 60%. Relative humidity also affects the rate of offgassing of formaldehyde from indoor building materials, the rate of formation of acids and salts from sulfur and nitrogen dioxide, and the rate of formation of ozone. The influence of relative humidity on the abundance of allergens, pathogens, and noxious chemicals suggests that indoor relative humidity levels should be considered as a factor of indoor air quality. The majority of adverse health effects caused by relative humidity would be minimized by maintaining indoor levels between 40 and 60%. This would require humidification during winter in areas with cold winter climates. Humidification should preferably use evaporative or steam humidifiers, as cool mist humidifiers can disseminate aerosols contaminated with allergens.

show abstract

Physical Properties of Sputum. Iv. Effects of 100 Per Cent Humidity and Water Mist

Cited by 11 publications

References 0 publications

Non-invasive ventilation assists chest physiotherapy in adults with acute exacerbations of cystic fibrosis

Non-invasive ventilation assists chest physiotherapy in adults with acute exacerbations of cystic fibrosis

Indirect health effects of relative humidity in indoor environments.

Indirect Health Effects of Relative Humidity in Indoor Environments

Contact Info

Product

Resources

About