Assessment of Pulmonary Mechanics and Gastric Inflation Pressure During Mask Ventilation

1995 ◽  
Vol 10 (2) ◽  
pp. 101-105 ◽  
Author(s):  
Norbert Weiler ◽  
Wolfgang Heinrichs ◽  
Wolfgang Dick
Keyword(s):  
Lung Function ◽  
Time Constant ◽  
Face Mask ◽  
Pulmonary Mechanics ◽  
Mask Ventilation ◽  
Inflation Pressure ◽  
The Face ◽  
Urological Procedures ◽  
The Mean ◽  
Mean Compliance

AbstractIntroduction:Mask ventilation is a procedure routinely used in emergency medicine. Potential hazards are inadequate alveolar ventilation and inflation of the stomach with air, leading to subsequent regurgitation and aspiration. The aim of this study was to measure lung function and gastric inflation pressures during mask ventilation.Methods:For this purpose, 31 patients scheduled for routine urological procedures were studied during induction of anesthesia. Lung function was assessed by recording respiratory flow and pressure directly at the face mask. Gastric inflation was observed with a microphone taped to the epigastric area.Results:Gastric inflation occurred in 22 of the 31 patients. Mean gastric inflation pressure was 27.5 ±6.55 cm H2O, mean compliance was 67 ±24.1 ml/cm H2O, mean resistance was 17.4 ±6.41 cm H2O/L/sec, and the mean respiratory time constant was 1.1 ±0.26 seconds.Conclusions:These data suggest that inspiratory pressure be limited to 20 cm H2O, and that an inspiratory time of at least four times the respiratory time constant be allowed. Monitoring airway pressure and gastric inflation is a simple technique that may improve the safe-ty of patients during mask ventilation.

Neonatal mannequin comparison of the Upright self-inflating bag and snap-fit mask versus standard resuscitators and masks: leak, applied load and tidal volumes

2017 ◽  
Vol 103 (6) ◽  
pp. F562-F566 ◽  
Author(s):  
Anthony Richard Rafferty ◽  
Lucy Johnson ◽  
Peter G Davis ◽  
Jennifer Anne Dawson ◽  
Marta Thio ◽  
...  
Keyword(s):  
Tidal Volume ◽  
Airway Pressure ◽  
Applied Load ◽  
Face Mask ◽  
The Other ◽  
Mask Ventilation ◽  
Additional Load ◽  
The Face

ObjectiveNeonatal mask ventilation is a difficult skill to acquire and maintain. Mask leak is common and can lead to ineffective ventilation. The aim of this study was to determine whether newly available neonatal self-inflating bags and masks could reduce mask leak without additional load being applied to the face.DesignForty operators delivered 1 min episodes of mask ventilation to a mannequin using the Laerdal Upright Resuscitator, a standard Laerdal infant resuscitator (Laerdal Medical) and a T-Piece Resuscitator (Neopuff), using both the Laerdal snap-fit face mask and the standard Laerdal size 0/1 face mask (equivalent sizes). Participants were asked to use pressure sufficient to achieve ‘appropriate’ chest rise. Leak, applied load, airway pressure and tidal volume were measured continuously. Participants were unaware that load was being recorded.ResultsThere was no difference in mask leak between resuscitation devices. Leak was significantly lower when the snap-fit mask was used with all resuscitation devices, compared with the standard mask (14% vs 37% leak, P<0.01). The snap-fit mask was preferred by 83% of participants. The device-mask combinations had no significant effect on applied load.ConclusionsThe Laerdal Upright Resuscitator resulted in similar leak to the other resuscitation devices studied, and did not exert additional load to the face and head. The snap-fit mask significantly reduced overall leak with all resuscitation devices and was the mask preferred by participants.

scholarly journals Objective assessment of compliance with intra- and extraoral removable appliances

2016 ◽  
Vol 87 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Angela Arreghini ◽  
Silvia Trigila ◽  
Luca Lombardo ◽  
Giuseppe Siciliani
Keyword(s):  
Treatment Duration ◽  
Objective Assessment ◽  
Young Patients ◽  
Face Mask ◽  
Control Scale ◽  
Psychological Maturity ◽  
The Mean ◽  
Removable Appliance ◽  
Removable Appliances ◽  
Mean Compliance

ABSTRACT Objective: To conduct an objective assessment of the level of compliance in young patients prescribed various types of removable appliances and to determine the influence of device type, treatment duration, and patient age, gender, psychological maturity, and awareness of monitoring on compliance. Materials and Methods: A total of 30 patients were fitted with either a class 2 (Frankel or bionator) or a class 3 (face mask) removable appliance, each bearing a compliance indicator chip, and they were instructed to wear them for 13 hours per day. Compliance was monitored by means of the sensor for an average of 8 months. Of the patients, 14 were informed that their appliance was fitted with a monitoring sensor, and 16 were not. The psychological maturity of all patients was assessed on the Nowicki-Strickland Locus of Control Scale, and the effect on compliance of this score as well as the patient- and treatment-related variables considered were determined via statistical analysis Results: The mean compliance recorded by the chips was 8.6 ± 2.9 hours, far lower than the 13 hours prescribed, and younger patients showed significantly greater compliance than adolescents (P &lt; .01). However, no significant differences in compliance were found between intra- and extraoral appliances, and neither gender, psychological scores, treatment duration, nor awareness of being monitored had any significant effect. Conclusions: Compliance is generally very poor in young patients, regardless of their gender and psychological maturity. Although awareness of monitoring does not appear to boost compliance, such systems may be a valuable means of providing a dentist with objective information regarding their patients' compliance.

Direct measurement of static chest wall compliance in animal and human neonates

1988 ◽  
Vol 65 (3) ◽  
pp. 1093-1098 ◽  
Author(s):  
G. M. Davis ◽  
A. L. Coates ◽  
A. Papageorgiou ◽  
M. A. Bureau
Keyword(s):  
Chest Wall ◽  
Face Mask ◽  
Premature Neonate ◽  
Lung Compliance ◽  
Pulmonary Mechanics ◽  
Chest Wall Compliance ◽  
Wall Compliance ◽  
The Mean ◽  
Dynamic Lung Compliance ◽  
Neonates And Infants

The measurement of pulmonary mechanics has been developed extensively for adults, and these techniques have been applied directly to neonates and infants. However, the compliant chest wall of the infant frequently predisposes to chest wall distortion, especially when there is a low dynamic lung compliance (CL,dyn). We describe a technique of directly measuring the static chest wall compliance (Cw,st), developed initially in the newborn lamb and subsequently applied to the premature neonate with chest wall distortion. The mean CL,dyn in seven intubated newborn lambs in normoxia was 2.45 +/- 0.41 ml.cmH2O-1.kg-1, whereas Cw,st was 11.81 +/- 0.25 ml.cmH2O-1.kg-1. These values did not change significantly in seven animals breathing through a tight-fitting face mask or with hypercapnia-induced tachypnea. For the eight premature infants the mean CL,dyn was 1.35 +/- 0.36 ml.cmH2O-1.kg-1, whereas the mean Cw,st was 3.16 +/- 1.01 ml.cmH2O-1.kg-1. This study shows that, under relaxed conditions when measurements of static compliance are performed, the chest wall is more compliant than the lung. The measurement of Cw,st may thus be used to determine the contribution of the respiratory musculature in stabilizing the chest wall.

scholarly journals Remote Monitoring of Patient Respiration with Mask Attachment—A Pragmatic Solution for Medical Facilities

Inventions ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 81
Author(s):  
Vivian Ci Ai Koh ◽  
Yi Yang Ang ◽  
Wee Ser ◽  
Rex Xiao Tan
Keyword(s):  
Remote Monitoring ◽  
Healthcare Professionals ◽  
Vital Signs ◽  
Face Mask ◽  
Detection Algorithm ◽  
Data Collection Process ◽  
Medical Facilities ◽  
The Face ◽  
The Mean ◽  
Healthy Participants

Remote monitoring of vital signs in infectious patients minimizes the risks of viral transmissions to healthcare professionals. Donning face masks could reduce the risk of viral transmissions and is currently practiced in medical facilities. An acoustic-sensing device was attached to face masks to assist medical facilities in remotely monitoring patients’ respiration rate and wheeze occurrence. Usability and functionality studies of the modified face mask were evaluated on 16 healthy participants. Participants were blindfolded throughout the data collection process. Respiratory rates of the participants were evaluated for one minute. The wheeze detection algorithm was assessed by playing 176 wheezes and 176 normal breaths through a foam mannequin. No discomfort was reported from the participants who used the modified mask. The mean error of respiratory rate was found to be 2.0 ± 1.3 breath per minute. The overall accuracy of the wheeze detection algorithm was 91.9%. The microphone sensor that was first designed to be chest-worn has been proven versatile to be adopted as a mask attachment. The current findings support and suggest the use of the proposed mask attachment in medical facilities. This application can be especially helpful in managing a sudden influx of patients in the face of a pandemic.

scholarly journals A multi-center, cross-sectional study on the prevalence of facial dermatoses induced by mask use in the general public during the COVID-19 pandemic

2022 ◽  
Vol 13 (1) ◽  
pp. 1-5
Author(s):  
Tanreet Kaur ◽  
Simplepreet Kaur
Keyword(s):  
Face Mask ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Skin Reactions ◽  
Prolonged Duration ◽  
The Face ◽  
The Mean ◽  
One Year ◽  
Facial Dermatosis ◽  
Structured Questionnaire

Background: The use of face masks and coverings has been recommended in public settings to minimize the risk of the transmission of coronavirus. The rampant surge in the use of masks for a prolonged duration has resulted in various facial dermatoses. Materials and Methods: The present study was an outpatient, multicentric, observational survey conducted over the period of one year. A total of 350 patients were enrolled. A structured questionnaire was employed to collect data identifying adverse skin reactions that had occurred in the area covered by a face mask. Results: Most of the facial dermatoses were observed in the urban population (78.85%). Maskne was the most common facial dermatosis, detected in 62% of the participants, followed by hypopigmentation (11.42%), hyperpigmentation (8.28%), contact dermatitis (5.42%), non-specific erythema (4.28%), desquamation (3.71%), urticaria (2.57%), and cheilitis (2.28%). The mean duration of mask use was 5.76 hours. A majority of the participants reported maskne in the U zone (both on the cheeks and the chin area) of the face (34%), followed by isolated involvement of the chin (26%), cheeks (20%), mandible region (14%), and bridge of the nose (6%). Conclusion: The use of face masks for extended hours without adequate precautions causes various cutaneous adverse effects. Thus, it is important to identify the risk factors precipitating mask-related facial dermatoses.

The Difference in Facial Movement Between the Medial and the Lateral Midface: A 3D Skin Surface Vector Analysis

2021 ◽  
Author(s):  
David L Freytag ◽  
Michael G Alfertshofer ◽  
Konstantin Frank ◽  
Dmitry V Melnikov ◽  
Nicholas Moellhoff ◽  
...  
Keyword(s):  
3D Imaging ◽  
Functional Anatomy ◽  
Skin Surface ◽  
Facial Movements ◽  
Anatomic Location ◽  
Objective Evidence ◽  
The Face ◽  
Functional Boundary ◽  
The Mean ◽  
The Difference

Abstract Background Our understanding of the functional anatomy of the face is constantly improving. To date, it is unclear whether the anatomic location of the line of ligaments has any functional importance during normal facial movements such as smiling. Objectives It is the objective of the present study to identify differences in facial movements between the medial and lateral midface by means of skin vector displacement analyses derived from 3D imaging and to further ascertain whether the line of ligaments has both a structural and functional significance in these movements. Methods The study sample consisted of 21 healthy volunteers (9 females & 12 males) of Caucasian ethnic background with a mean age of 30.6 (8.3) years and a mean BMI of 22.57 (2.5) kg/m 2. 3D images of the volunteers’ faces in repose and during smiling (Duchenne type) were taken. 3D imaging-based skin vector displacement analyses were conducted. Results The mean horizontal skin displacement was 0.08 (2.0) mm in the medial midface (lateral movement) and was -0.08 (1.96) mm in the lateral midface (medial movement) (p = 0.711). The mean vertical skin displacement (cranial movement of skin toward the forehead/temple) was 6.68 (2.4) mm in the medial midface whereas it was 5.20 (2.07) mm in the lateral midface (p = 0.003). Conclusions The results of this study provide objective evidence for an antagonistic skin movement between the medial and the lateral midface. The functional boundary identified by 3D imaging corresponds to the anatomic location of the line of ligaments.

scholarly journals Design and Implementation of Intelligent Inspection and Alarm Flight System for Epidemic Prevention

Drones ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 68
Author(s):  
Jiwei Fan ◽  
Xiaogang Yang ◽  
Ruitao Lu ◽  
Xueli Xie ◽  
Weipeng Li
Keyword(s):  
Deep Learning ◽  
Autonomous Navigation ◽  
Detection Method ◽  
Active Role ◽  
Absolute Error ◽  
Face Mask ◽  
Learning Technology ◽  
Flight System ◽  
Crowd Density ◽  
The Mean

Unmanned aerial vehicles (UAV) and related technologies have played an active role in the prevention and control of novel coronaviruses at home and abroad, especially in epidemic prevention, surveillance, and elimination. However, the existing UAVs have a single function, limited processing capacity, and poor interaction. To overcome these shortcomings, we designed an intelligent anti-epidemic patrol detection and warning flight system, which integrates UAV autonomous navigation, deep learning, intelligent voice, and other technologies. Based on the convolution neural network and deep learning technology, the system possesses a crowd density detection method and a face mask detection method, which can detect the position of dense crowds. Intelligent voice alarm technology was used to achieve an intelligent alarm system for abnormal situations, such as crowd-gathering areas and people without masks, and to carry out intelligent dissemination of epidemic prevention policies, which provides a powerful technical means for epidemic prevention and delaying their spread. To verify the superiority and feasibility of the system, high-precision online analysis was carried out for the crowd in the inspection area, and pedestrians’ faces were detected on the ground to identify whether they were wearing a mask. The experimental results show that the mean absolute error (MAE) of the crowd density detection was less than 8.4, and the mean average precision (mAP) of face mask detection was 61.42%. The system can provide convenient and accurate evaluation information for decision-makers and meets the requirements of real-time and accurate detection.

scholarly journals Examining the interplay between face mask usage, asymptomatic transmission, and social distancing on the spread of COVID-19

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Adam Catching ◽  
Sara Capponi ◽  
Ming Te Yeh ◽  
Simone Bianco ◽  
Raul Andino
Keyword(s):  
Social Distance ◽  
Large Fraction ◽  
Real Life ◽  
Virus Transmission ◽  
Face Mask ◽  
Social Distancing ◽  
Viral Spread ◽  
The Face ◽  
Asymptomatic Individuals ◽  
High Virus

AbstractCOVID-19’s high virus transmission rates have caused a pandemic that is exacerbated by the high rates of asymptomatic and presymptomatic infections. These factors suggest that face masks and social distance could be paramount in containing the pandemic. We examined the efficacy of each measure and the combination of both measures using an agent-based model within a closed space that approximated real-life interactions. By explicitly considering different fractions of asymptomatic individuals, as well as a realistic hypothesis of face masks protection during inhaling and exhaling, our simulations demonstrate that a synergistic use of face masks and social distancing is the most effective intervention to curb the infection spread. To control the pandemic, our models suggest that high adherence to social distance is necessary to curb the spread of the disease, and that wearing face masks provides optimal protection even if only a small portion of the population comply with social distance. Finally, the face mask effectiveness in curbing the viral spread is not reduced if a large fraction of population is asymptomatic. Our findings have important implications for policies that dictate the reopening of social gatherings.

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