The interplay between cardiovascular symptoms and stress has been a matter of concern for centuries. The first known scientific description of panic disorder, for example, which would nowadays be considered a mixture of panic disorder itself, post-traumatic-stress disorder, cardiac arrhythmia and congestive heart failure, took place in a cohort of three hundred patients of a military hospital in Philadelphia (USA). The name of the new diagnostic entity that followed (“irritable heart syndrome” or simply “Da Costa Syndrome,” named after the author of the original description) is rather an indicator of the historical overlap between cardiovascular diseases (CVD) and psychosocial conditions than properly an example of scientific rigor in describing the discovery of a new medical syndrome.

About sixteen years after the description of the irritable heart syndrome, Augustus Waller, a British physiologist, published the first human electrocardiogram (EKG) applying a capillary electrometer and placing electrodes in the chest and back of an individual. More than half a century after Waller’s publication, the 12-Lead EKG – as we know it now – was standardized by the American Heart Association. Since then, EKG is the most important test for the interpretation of cardiac rhythm and for the detection of myocardial ischemia. In sharp contrast with diagnostic developments in Cardiology and despite a whole new era in neuroimaging, no single physiological marker has emerged to help detecting anxiety disorders or depression in Psychiatry. Nonetheless, the degree to which mental disorders are realized within the brain or in the rest of the body is still unclear.

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