Cocaine, methamphetamine, opioids, and cannabis whether stimulants or depressants cause quite dramatic and often rapid effects on the autonomic nervous system.
Results of a case-control study showed a small increase in various arrhythmias in chronic pain patients given a medical cannabis prescription, although the absolute risk was small.
Some patients with symptoms of postural tachycardia syndrome may be experiencing a fear response caused by previous fainting episodes, new research suggests.
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