What is medical psychiatry, and why is it relevant now?
There has been substantial and increasing interest in the integration of medical and psychiatric care. Whether it is collaborative care or co-location models, the recognition of the high rate of combined medical and psychiatric illnesses and associated increased mortality and total health care costs of these patients requires psychiatrists to be deeply familiar with the interactions among medical and psychiatric conditions.
Building on long-developed expertise in consultation-liaison psychiatry and other forms of medical psychiatric training, such as double-board medicine–psychiatry programs, medical psychiatry includes several specific areas of knowledge and skill sets, including understanding the impact that psychiatric illnesses and the medications used to treat them can have on medical illnesses and the ways in which the presence of medical disorders can change the presentation of psychiatric illnesses. Similarly, the psychiatric impact of the general medical pharmacopeia and the ways in which psychiatric illness can affect the presentation of medical illness are important for all psychiatrists to know. Most importantly, medical psychiatry should focus on the medical and neurologic causes of psychiatric illnesses. Many general medical conditions produce symptoms, which, in whole or in part, mimic psychiatric illnesses and, in some cases, could lead to psychiatric disorders, which makes identification of the underlying cause difficult.
Whether due to infectious, autoimmune, metabolic, or endocrinologic disorders, being aware of these conditions and, where clinical circumstances warrant, be able to diagnose them, with other specialists as needed, and ensure they are appropriately treated should be an essential skill for psychiatrists.
An illustrative case
I remember a case from early in my training of a woman with a late-onset mood disorder with abulia, wide-based gait, and urinary incontinence, in addition to withdrawal and loss of pleasure. Despite the skepticism of the neurology team, at autopsy she was found to have arteriosclerosis of the deep, penetrating arterioles causing white matter hyperintensities—Binswanger’s disease. There was no question that despite the neurologic cause of her symptoms treating her depression with antidepressants was needed and helpful. It also was important that her family was aware of her underlying medical condition and its implications for her care.2