Does this classical account of the heart sound remarkably like modern post-traumatic stress disorder? The psychological shock and trauma we endure are not merely issues of the mind; they provoke profound biological changes throughout our brain and entire body. Just as Donguibogam described the heart as a monarch, modern medicine views the brain as the body's commander-in-chief, and trauma throws this commander's system of command into disarray.
Specifically, multiple regions of the brain are affected. First, the hippocampus, responsible for memory, undergoes atrophy or dysfunction. Consequently, individuals who have experienced trauma often recall specific past events with agonizing clarity (flashbacks), while ordinary daily memories may fade. In addition, the amygdala, which regulates emotion, becomes abnormally active, triggering severe anxiety or terror in response to even minor stimuli, much like an alarm system repeatedly malfunctioning. Finally, the prefrontal cortex, which aids rational judgment and emotional inhibition, declines in function, leading to impulsive behaviors or difficulties with emotional regulation.
These neural changes trigger hyperactivation of our body's stress response systems. A primary example is the hypothalamic-pituitary-adrenal axis. After experiencing trauma, this axis remains continuously active, causing chronic oversecretion of the stress hormone cortisol. While cortisol assists in coping with threats in the short term, over the long term it diminishes immunity, promotes inflammatory responses, and burdens the cardiovascular system. It can provoke hypertension, increased heartbeat, and even arrhythmia.
Furthermore, trauma impacts the autonomic nervous system. As the sympathetic nerve becomes heightened and the parasympathetic nerve is inhibited, the body remains trapped in a persistent 'fight-or-flight' state. This is why physical symptoms such as a pounding chest, cold sweats, and indigestion arise. Such chronic tension reduces heart rate variability (HRV), signaling that the heart's capacity to flexibly adapt to environmental changes has weakened, which is recognized as detrimental to long-term cardiac health.
Ultimately, Donguibogam’s observation that fright and fear damage the heart accurately foresaw the complex process wherein core brain areas are damaged and the endocrine system is disrupted, harming the heart and overall health. It is essential to recognize that mind and body are not separate; the brain and heart constantly exchange signals in an organic loop. Understanding this connection helps illuminate the path toward comforting a hurting heart and returning to a healthy life.
