Delirium & Heart Disease: Risks, Prevention & New Treatment Approaches

Delirium, a state of sudden confusion characterized by disorientation, impaired attention, and altered perception, is a surprisingly common and often underestimated complication following cardiac procedures. New research highlights that this temporary confusion can have lasting consequences, extending far beyond the immediate post-operative period. A recent international review involving leading cardiologists, cardiac surgeons, intensive care physicians, and psychiatrists has found that delirium is associated with longer hospital stays, increased mortality, higher rates of care dependency, and a significantly increased risk of permanent cognitive impairment – even in individuals who previously had normal cognitive function.

The Scope of Post-Cardiac Delirium

Delirium can occur after a range of cardiac interventions, from complex open-heart surgery to less invasive procedures like transcatheter aortic valve replacement (TAVR) or percutaneous coronary intervention (PCI). The risk is particularly heightened in elderly patients and those with pre-existing medical conditions. “Delirium is not a marginal problem, but one of the central complications of modern cardiac medicine,” state Prof. Dr. Dr. Enzo Lüsebrink, a cardiologist in Bonn, and Prof. Dr. Georg Nickenig, director of the Clinic for Cardiology at the UKB.

Often Overlooked and Under-Recorded

Despite its clinical relevance, delirium frequently goes unrecognized in cardiovascular care. The hypoactive form – characterized by apathy, reduced activity, and listlessness – is particularly prone to being missed and mistakenly attributed to age-related changes or exhaustion. “Validated and standardized screening instruments such as the Confusion Assessment Method, or CAM for short, with the corresponding extension for intensive care units, which can be used quickly and reliably, are still far too rarely used routinely in everyday clinical practice,” says Endrit Cekaj, assistant physician at the Clinic for Cardiology at the UKB.

Prevention is Key

A central finding of the recent review is that the most effective strategy against delirium is prevention. Multimodal, non-pharmacological measures – including early mobilization, reorientation, sleep hygiene, cognitive stimulation, adequate pain management, and the involvement of relatives – can reduce the incidence of delirium by up to 40 percent. The study authors take a critical view of the routine prophylactic use of medication.

“We also clearly show that delirium does not have to be accepted as inevitable, even if it occurs despite consistent prevention.”

Dr. David H.V. Vogel, co-first author, head of the “Experimental Psychopathology” research group at the Clinic for Psychiatry and Psychotherapy KB

Based on current evidence and interdisciplinary expert consensus, the authors propose structured treatment approaches tailored to the severity of delirium, the clinical setting, and the specific subtype.

Treatment Approaches: Evidence-Based and Practical

Non-pharmacological measures remain the cornerstone of treatment for all degrees of severity. When clinically necessary, pharmacological options are presented in a differentiated manner. In intensive care settings, the sedative dexmedetomidine has shown benefit in moderate to severe delirium. Antipsychotic substances may be used depending on the situation and symptoms, but the benefits must be carefully weighed against potential cardiac side effects.

“A structured, step-by-step approach is crucial,” explains Prof. Lüsebrink. “Our work shows that there are also evidence-based and clinically practicable treatment strategies in the cardiovascular setting – provided that delirium is detected early and treated in an interdisciplinary manner.” Prof. Dr. Alexandra Philipsen, Director of the Clinic for Psychiatry and Psychotherapy at the UKB, emphasizes the importance of a holistic view: “We can successfully treat our patients medically for heart conditions. But if we do not systematically recognize and prevent delirium, we risk long-term damage to the brains of those affected. Delirium prevention must therefore become an integral part of cardiovascular care.”

While knowledge of delirium is growing, evidence specifically for cardiovascular patient groups remains limited. The authors call for targeted, prospective studies to develop specific guidelines for prevention and treatment. The increasing number of individuals undergoing cardiac interventions, coupled with an aging population often presenting with pre-existing health conditions, underscores the critical need for improved understanding and management of this often-overlooked complication.