The neural monitoring of visceral inputs might play a role in first-person perspective, i.e. the unified viewpoint of subjective experience. In healthy participants, how the brain responds to heartbeats, measured as the heartbeat-evoked response (HER), correlates with perceptual, bodily, and self-consciousness. Here we show that HERs in resting-state EEG data distinguishes between post-comatose male and female human patients (n=68, split into training and validation samples) suffering from the unresponsive wakefulness syndrome and patients in minimally conscious state with high accuracy (random forest classifier, 87% accuracy, 96% sensitivity and 50% specificity in the validation sample). Random EEG segments not locked to heartbeats were useful to predict (un)consciousness, but HERs were more accurate, indicating that HERs provide specific information on consciousness. HERs also led to more accurate classification than heart rate variability. HER-based consciousness scores correlate with glucose metabolism...