Poster Presentation from IMSH 2010 describing a study focusing BVM ventilation among novice clinicians comparing the standard mask to the ErgoMask.

1. Simulation-based Evaluation of an Ergonomically Designed
Face Mask among Novice Users
1
Bauman EB, 1Joffe AM, 2 Devries SA, 2 Lenz L, 1Hetzel SJ, 1Seider SP, 1Han S
1
University of Wisconsin School of Medicine and Public Health, Madison, WI
2
Wester n Technical College, LaCrosse WI
INTRODUCTION
The ErgoMaskTM is a new facemask designed •Overall, tidal volumes were significantly
to ergonomically fit the clinicians’ left hand. higher at all time points using the ErgoMaskTM
The dome of the ErgoMaskTM contains compared to the standard mask.
grooves and edges enabling the operator to
use an asymmetrical left-hand grip, with the
posterior part of the mask higher than the •Over time, ventilation via the ErgoMaskTM
anterior. This design should better enable full did not significantly decrease (0.13 Ml/breath)
contact between the operator’s hand and the whereas use of the standard mask resulted in a
mask, avoid hand fatigue, allowing for better linear decrease in ventilation by 10 ml/breath
Special Thanks Lenora Parr (p < 0.001).
control of the facemask. We hypothesized
that ventilation with the ErgoMaskTM would After a brief tutorial on each mask, participants
result in greater delivered tidal breaths as performed basic airway maneuvers on the
compared to a standard facemask. airway trainer and obtained a mask seal prior •This decay in ventilation over time was Figure 1: Summary of repeated measures ANOVA with fitted regression lines: Y = tidal volume; X =
to the first ventilator-delivered breath. The unaffected by gender. However, males number of breaths; Dots represent ErgoMaskTM; Triangles represent Standard mask; Red repre-
returned tidal volume was recorded for each of performed better in terms of tidal volume sent Males; Black represents Females.
12 breaths for each participant for each mask. than females at all time points regardless of
Differences in minute ventilation between mask type used. Table 1: Mean (sd) tidal volume (mL) by Breath and Mask Type
masks were assessed by paired student T-Test
with a significance defined by a p-value of CONCLUSIONS Breath* Standard Mask ErgoMask p-value**
<0.05. Novice airway managers were able to more 1 330.3 (124.8) 376.9 (98.6) 0.682
effectively ventilate via a facemask by
2 316.5 (136.4) 369.0 (104.1) 0.594
Any effect on the ability to ventilate over time using an ergonomically designed device, the
with each mask was assessed by a repeated ErgoMaskTM, compared with a traditional 3 304.2 (141.9) 364.1 (105.7) 0.369
measure analysis of variance (RM-ANOVA) standard mask. Further, performance did
with tidal volume set as the response variable not decay over time when subjects were 4 264.1 (163.2) 361.0 (123.8) 0.040
and mask type, number of breaths, and gender using the ErgoMaskTM, whereas significant
METHODS as dependent variables with significance decay did occur with the standard mask. 5 261.3 (154.7) 371.9 (114.3) 0.011
Allied health students with minimal airway defined as a p-value <0.05. Insofar as BVM is likely to be necessary 6 260.1 (160.5) 369.8 (105.7) 0.023
management training used a standard or for more than the 1-minute tested here in
ErgoMaskTM to ventilate a Laerdal®Airway actual clinical resuscitation scenarios, using 7 256.8 (151.7) 363.3 (122.4) 0.049
Management Trainer in a random, crossover the ErgoMaskTM may have an even greater
design using their left hands. A Pulmonetics RESULTS impact than what we have shown. Clinical 8 243.7 (165.7) 369.6 (118.2) 0.005
LTV®1200 volume-cycled ventilator set to The following results are based on an RM- correlation and further examination of gender
9 234.4 (169.6) 368.0 (107.7) 0.005
deliver a tidal volume of 500 mL, 12 times ANOVA analysis with the following dependent differences is needed.
per minute, at an inspiratory-to-expiratory variables: mask type, time, gender, and the 10 218.4 (164.3) 364.6 (114.4) 0.003
ratio of 1:4 (cycle-length 5 seconds) provided interaction between mask type: time and Contact Person:
the actual ventilation. Participants squeezed mask type: gender. Eric B. Bauman, PhD, RN
11 223.3 (167.9) 370.2 (114.0) < 0.001
a breathing bag with their right hand in time Department of Anesthesiology
12 216.4 (170.3) 370.1 (118.8) 0.001
with the ventilator-delivered breath to simulate University of Wisconsin School of Medicine and Public Health
actual bag-valve-mask (BVM) ventilation. •Minute ventilation was significantly greater 600 Highland Avenue * Breaths were taken successively every 5 seconds
with the ErgoMaskTM than the standard Madison, WI 53792
mask. ebauman@wisc.edu ** paired T-Tests and are Bonferroni adjusted for 12 comparisons
This project was supported in part by the University of Wisconsin Institute for Clinical and Translational Research (UW ICTR), funded through an NIH Clinical and Translational Science Award (CTSA),