Traditional overnight pulse oximeter readings may be insufficient to predict TC-MRBs, finds study

Trending 2 weeks ago

In a caller study published in Scientific Reports, researchers evaluated nan predictive powerfulness of galore sleep-disordered breathing (SDB) parameters, namely overnight beat oximeter readings and nan Epworth Sleepiness Scale (ESS) successful predicting motortruck collisions attributed to microsleep-related behaviors astatine nan instrumentality (TC-MRBs).

 Gorodenkoff/Shutterstock.comStudy: Risk factors for collisions attributed to microsleep-related behaviors while driving successful master motortruck drivers. Image Credit: Gorodenkoff/


Their findings from a cohort of Japanese motortruck drivers confirmed by dashcam footage item that nan 4% oxygen desaturation scale (ODI), nadir oxygen saturation (SpO2), and, astir significantly, night-time motortruck driving were associated considerably pinch TC-MRBs.

Notably, nan accepted usage of conscionable overnight beat oximeter readings was recovered to person mediocre TC-MRB-predictive power, suggesting nan request for combining subjective and nonsubjective assessments to amended TC-MRB-predictive accuracy and forestall collisions among master motortruck drivers.

SDB and its domiciled successful TC-MRBs

Sleep-disordered breathing (SDB) is simply a aesculapian word for respective sleep-related breathing disorders, including obstructive slumber apnea (OSA), cardinal slumber apnea, sleep-related hypoventilation, and hypoxemia.

Characteristic by sleep-obstructing factors, including airway obstruction and slumber interruption owed to arousal caused by nan absence of respiratory effort, SDB is alarmingly prevalent and is estimated to impact betwixt 15% and 50% of nan world population.

Given its relation pinch excessive daytime sleepiness (EDS), cardiovascular diseases (CVDs), dementia, cognitive dysfunction, and metabolic disorders, SDB presents a modifiable consequence facet successful overnight professions specified arsenic master motortruck driving.

Unfortunately, SDB among master motortruck drivers is substantially higher than nan world mean, pinch betwixt 40.1% and 71.8% of each motortruck drivers estimated to suffer from nan condition.

Previous truck-driver-specific investigation has identified respective adverse outcomes of SDB among this cohort, including hypertension, CVD, anxiety, depression, and metabolic discomfort.

Notably, SDB has been implicated successful aggregate centrifugal conveyance accidents (MVAs) moreover among nan wide organization and is assumed to beryllium a cardinal predictor of microsleep-related behaviors astatine nan instrumentality (TC-MRBs) for truck-driver-induced MVAs.

Traditional objective interventions against SDB, including test via afloat polysomnography (PSG) and curen utilizing continuous affirmative unit (CPAP), person proven useful successful importantly decreasing MVAs and CVDs successful SDB patients.

Unfortunately, afloat polysomnography is expensive, time-consuming, and requires specialized instrumentality and quality resources for examination, making it unfeasible for ample motortruck companies.

Therefore, nan Epworth Sleepiness Scale (ESS), successful tandem pinch overnight beat oximeter measures, is often utilized arsenic proxies for PSG successful identifying SDB among motortruck drivers and, successful turn, predicting their MVAs risk.

Unfortunately, these assessments person proven constricted successful their inferior fixed nan 'self-reported' quality of existent 'falling dormant astatine nan wheel' occurrences.

Furthermore, outcomes of studies measuring nan predictive accuracy and exertion of beat oximeter readings successful SDB evaluations stay confounding.

Identifying easy-to-estimate predictors of SDB among this highly at-risk organization (truck drivers) would let for improved MVA mitigation plans and employment policies, thereby benefiting each parties involved.

About nan study

The coming study is simply a retrospective, nationwide database information incorporating accepted SpO2 measures, subjective truck-driver sleepiness reports, and nonsubjective dashcam footage to measure nan associations betwixt sleepiness/SDB and TC-MRBs among master motortruck drivers.

The study sample cohort was derived from a ample Japanese proscription institution pinch much than 400 branches crossed nan state and much than 5,450 actively employed motortruck drivers.

Participants were enrolled successful nan study if they were astatine slightest 18 and had been progressive successful nary aliases 1 suspected sleepiness-associated collision.

Drivers who received aesculapian assessments (especially polysomnography) complete nan preceding twelvemonth were excluded from nan analyses.

Data postulation included sociodemographics, anthropometrics (age, sex, assemblage wide scale [BMI]), and aesculapian records (specifically, nan mean clip betwixt wellness checks and a TC-MRB event). Participants' systolic and diastolic humor unit and dashcam footage were acquired.

"In this study, nan TC-MRBs group consisted of master motortruck drivers who reported during interviews that their motortruck collisions were caused by falling asleep. After nan interviews, we reviewed nan 1-min dashcam video footage earlier nan TC-MRBs to corroborate that each nan master motortruck drivers had been progressive successful TC-MRBs. The dashcam video footage was recorded from nan wrong and extracurricular of nan motortruck to corroborate nan behaviour of some nan motortruck driver and nan different vehicle's driver."

TC-MRBs group participants (with 1 MVA connected record) were one-to-one matched pinch controls (no recorded MVAs; non-TC-MRBs group) to let for comparisons to place practices for reducing TC-MRBs among master motortruck drivers.

Experimental interventions included overnight beat oximetry and slumber tests conducted from nan convenience of nan participant's homes. Pulse oximetry metrics included nan 3% oxygen desaturation scale (ODI), 4% ODI, nadir SpO2 (lowest recorded oxygen saturation), and mean SpO2.

"The Gaussian distribution was evaluated utilizing nan Shapiro–Wilk test, and nan t-test aliases Mann–Whitney U trial was utilized to comparison continuous data. Drivers without TC-MRBs were matched pinch drivers pinch TC-MRBs utilizing nan propensity matching method (nearest neighbour method, TC-MRBs: non-TC-MRBs = 1:1, caliper: 0.20). The included variables for nan matching were property and sex. For comparison, we besides calculated nan effect size utilizing Cohen's."

Study findings and conclusions

Of nan 5,454 motortruck drivers initially included successful nan study, 862 reported aggregate collisions, 4,353 reported collisions not attributed to sleepiness, 165 received caller (<1 twelvemonth prior) wellness checkups, and 20 did not supply dashcam footage, each of whom were excluded from nan study. Therefore, nan last sample size was 108 (N = 54 per study cohort).   

Contradicting erstwhile hypotheses, 3% ODI, mean SpO2, ESS scorers, and EDS beingness were not statistically associated pinch TC-MRBs. In contrast, nadir SpO2 and 4% ODI were importantly related to TC-MRBs among evaluated motortruck drivers.

Unfortunately, erstwhile assessed successful isolation, nan predictive powerfulness of overnight beat oximetry readings was poor.

"The receiver operating characteristic (ROC) curve study showed debased AUC values pinch 4% ODI and nadir SpO2 being mediocre astatine identifying TC-MRBs, whereas night-time driver was powerfully associated pinch TC-MRBs successful nan master driver."

Study findings propose that a operation of nonsubjective and subjective lines of grounds whitethorn execute importantly amended than nan traditional, solely beat oximetry diagnostic design.

Specifically, a questionnaire that addresses sleepiness successful tandem pinch location cardiorespiratory monitoring devices aliases overnight beat oximetry, mixed pinch dashcam footage, possibly nan champion non-polysomnography to place at-risk individuals.

Journal reference:

  • Sawatari, H., Kumagai, H., Kawaguchi, K. et al. (2024) Risk factors for collisions attributed to microsleep-related behaviors while driving successful master motortruck drivers. Sci Rep 14, 6378. doi: