Key result
On-body ECG interval proxies and waveforms distinguished cocaine use from methylphenidate, exercise, and tobacco use with mean AUCs ranging from 0.87 to 0.99, independent of heart rate.
Why the study?
To assess whether the discriminatory power of remote on-body ECG sensors in distinguishing cocaine use from other sympathomimetic conditions is mainly driven by differences in heart rate.
Do on-body ECG sensors discriminate cocaine use from other sympathomimetic conditions independent of heart rate changes in individuals who use cocaine?
Observational (n=11)
Do on-body ECG sensors discriminate cocaine use from other sympathomimetic conditions independent of heart rate changes in individuals who use cocaine?
On-body ECG sensors can accurately discriminate cocaine use from other sympathomimetic states based on waveform and interval nuances independent of simple heart rate changes.
Answers are grounded in this paper and cite their sources.
ECG-based cocaine discrimination may hinge on heart rate; leaves open independent value pending larger validation.
OBJECTIVES: Our group has previously established how remote on-body electrocardiogram (ECG) sensors may discriminate cocaine use from other sympathomimetic conditions. The current analyses assess whether discriminatory power is mainly driven by differences in heart rate between conditions. METHODS: Individuals who use cocaine (N = 11) wore ECG sensors during (1) cocaine self-administration, (2) methylphenidate administration, (3) aerobic exercise, and (4) tobacco use (N = 9). Primary outcomes included: (1) time elapsed between 2 successive R waves (ie, RR interval), (2) ECG interval proxies, and (3) waveforms. ECG traces were matched for heart rate between conditions for all discriminations. RESULTS: ECG interval proxies and waveforms exhibited high discriminatory power in distinguishing cocaine use from methylphenidate, exercise, and tobacco use, with mean areas under the receiver operating characteristics ranging from 0.87 to 0.99, while RR-related measures ranged from 0.49 to 0.5, reflecting low discriminatory power. CONCLUSION: Our results suggest that the ECG sensors' discriminatory power is based on nuances in ECG data beyond mere changes in heart rate.
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Angarita et al. (2025) conducted an observational in Cocaine use (n=11). On-body electrocardiogram (ECG) sensors vs. Methylphenidate administration, aerobic exercise, and tobacco use was evaluated on Discriminatory power of RR interval, ECG interval proxies, and waveforms (mean AUC 0.87 to 0.99). On-body ECG interval proxies and waveforms distinguished cocaine use from methylphenidate, exercise, and tobacco use with mean AUCs ranging from 0.87 to 0.99, independent of heart rate.
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