Consultation–liaison psychiatry (C-L psychiatry or liaison psychiatry) is a subspecialty of psychiatry concerned with the assessment and treatment of psychiatric disorders and psychological distress in patients with medical, surgical or neurological conditions, usually in general hospitals and other medical settings. It operates at the interface between general medicine and psychiatry and is closely related to psychosomatic medicine, health psychology and neuropsychiatry. Modern C-L psychiatry is commonly described within the biopsychosocial model proposed by George L. Engel, which emphasises the interaction of biological, psychological and social factors in health and disease.
Definition and scope Consultation–liaison psychiatry services typically provide assessment and treatment for patients:
with psychiatric or behavioural symptoms caused or exacerbated by medical illness (for example delirium or mood changes due to systemic disease); with pre-existing mental disorders admitted for medical or surgical treatment; with medically unexplained physical symptoms or prominent somatic complaints without clear organic explanation; who experience psychological reactions to acute or chronic illness (such as adjustment disorder, anxiety, or depression after diagnosis of cancer or organ failure); who present with suicidal behaviour or self-harm in medical settings; who require assessment of capacity to consent to treatment or participation in complex ethical decisions (for example limitation of life-sustaining treatment). C-L teams usually work in close collaboration with internal medicine, surgery, intensive care, emergency medicine, oncology, neurology, geriatrics, nursing, psychology and social work. Interventions include diagnostic assessment, psychopharmacology in the context of complex comorbidity and polypharmacy, brief psychological interventions, psychoeducation, and advice to clinical teams on communication, risk management and discharge planning.
History The historical roots of consultation–liaison psychiatry lie in the development of psychosomatic medicine in the first half of the 20th century, which underlined the role of psychological and social factors in the onset and course of medical disease. Early work by figures such as Franz Alexander and colleagues integrated psychoanalytic ideas into hospital medicine and helped establish dedicated psychosomatic units in general hospitals. In the 1970s, Zbigniew J. Lipowski systematised the theoretical and clinical framework of consultation–liaison psychiatry, describing its functions in patient care, teaching and research within general hospitals. The field subsequently developed as a recognised component of psychiatric training in North America and Europe.
Recognition as a subspecialty In the United States, psychosomatic medicine was approved in 2003 by the American Board of Medical Specialties (ABMS) as a psychiatric subspecialty, with the American Board of Psychiatry and Neurology (ABPN) administering the first subspecialty examination in 2005. The official subspecialty name was changed from Psychosomatic Medicine to Consultation-Liaison Psychiatry on 1 January 2018 to reflect more clearly its clinical role in general hospitals. In Europe, the former European Association for Consultation-Liaison Psychiatry and Psychosomatics (EACLPP) – now part of the European Association of Psychosomatic Medicine – issued guidelines for training in C-L psychiatry and psychosomatics in 2007, highlighting marked variation in training across countries and recommending core competencies for residents and fellows. The former Academy of Psychosomatic Medicine, a US-based professional organisation established in 1953, changed its name to the Academy of Consultation-Liaison Psychiatry (ACLP) in 2018 to align with the updated subspecialty title.
Clinical practice
Settings and referral patterns Most consultation–liaison psychiatry services are based in general hospitals, university medical centres or specialised medical institutions. Referrals typically arise from:
inpatient medical and surgical wards (for example cardiology, oncology, respiratory medicine, nephrology); intensive care units (management of delirium, agitation, and psychological distress in critical illness); emergency departments (assessment after self-harm, suicidal ideation, confusion or acute behavioural disturbance); specialist clinics (such as pain, transplant, bariatric surgery, or autoimmune disease clinics). Common reasons for referral include delirium and other neurocognitive disorders, mood and anxiety symptoms in the context of chronic disease, adjustment disorder, somatic symptom disorder and related conditions, substance use, psychosis secondary to medical illness or medications, and assessment of capacity for high-risk medical decisions. In addition to direct patient care, C-L psychiatrists provide:
consultation to medical and surgical teams regarding psychopharmacology in the presence of organ failure and drug–drug interactions; brief supportive or cognitive-behavioural interventions for patients and families; teaching for residents, fellows, nurses and allied health professionals; participation in ethics committees and complex discharge planning.
Models of care Consultation–liaison psychiatry services are often described in terms of three overlapping modes of practice:
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