Estimate appropriate size of endotracheal tube for infants and children
ett_size_cole uses the classic Cole formula for uncuffed tubes,
Motoyama formula for cuffed tubes with age over two years, and the Khine
formula for cuffed tubes with age under two years. All of these, as any
anesthesiologist will tell, give poor estimates at any extreme of age, or
height. These formulae are for use in pediatric practice only.
ett_size_by_age(age_y, cuffed = TRUE)
age_y |
numeric vector |
cuffed |
logical vector, single value, or a vector of the same length as the given age vector, defining whether the desired tube is to be cuffed. If not specified, then it is assumed that a cuffed tube is used. |
ETT size, internal diameter in mm, rounded to nearest half-mm size up to 6mm, then the nearest integer.
Other airway equipment: deadspace_things_ml,
deadspace_total, ett_vol_ml
teenagers <- ett_size_by_age(13:18) plot(13:18, teenagers, main = "This formula for ETT tube size overestimates tube sizes of teenagers, and takes no account of gender") lines(13:18, teenagers) ages <- c(1/12, 1, 2, 4, 7, 11) neonate_to_child <- ett_size_by_age(age = ages) names(neonate_to_child) <- ages print(neonate_to_child) plot(ages, neonate_to_child) lines(ages, neonate_to_child) plot(ages, neonate_to_child, log = "x") lines(ages, neonate_to_child)
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