Delirium: A Critical, Underestimated Complication in Cardiology

Delirium is characterized by a sudden onset of acute confusion, disorientation, impaired attention, and altered perception, often accompanied by hallucinations or sleep disturbances. In cardiology, it is a common but frequently underestimated complication, particularly affecting older patients post-cardiac surgery or interventional procedures. A recent international review, involving cardiologists, cardiac surgeons, intensive care physicians, and psychiatrists, has concluded that delirium extends beyond temporary confusion.

Delirium extends beyond temporary confusion, posing significant long-term risks for patients, even those previously cognitively normal.

The Far-Reaching Consequences of Delirium

The review findings indicate that delirium is associated with longer intensive care and hospital stays, increased mortality, higher rates of care dependency, and a significantly elevated risk of permanent cognitive impairment. It also serves as an independent predictor of long-term mental decline, even in individuals who were previously cognitively normal.

A High Incidence, Yet Often Unrecognized Threat

Delirium develops in a significant number of patients, especially after complex cardiac surgery and interventional procedures like TAVR or PCI, particularly in very elderly and pre-existing patients.

Despite its clinical relevance, delirium often goes unrecognized in cardiovascular practice. The hypoactive form, characterized by apathy and reduced activity, is frequently misdiagnosed as age-related or exhaustion. Standardized screening instruments, such as the Confusion Assessment Method (CAM), are not routinely used in everyday clinical practice.

Prioritizing Prevention and Structured Care

The review emphasizes prevention as the most effective strategy against delirium. Multimodal, non-pharmacological measures, including early mobilization, reorientation, sleep hygiene, cognitive stimulation, adequate pain management, and family involvement, can reduce delirium incidence by up to 40 percent. Routine prophylactic medication use is viewed critically.

Multimodal, non-pharmacological measures are the therapeutic basis for both prevention and treatment of delirium, with routine prophylactic medication use viewed critically.

Structured, evidence-based treatment approaches are also detailed, tailored to severity, clinical setting, and delirium subtype. Non-pharmacological measures form the therapeutic basis. Pharmacological options, such as the sedative dexmedetomidine for moderate to severe delirium in intensive care, and antipsychotic substances for specific situations, are presented with considerations for benefits and potential cardiac side effects.

The Path Forward: A Call for Targeted Research

The authors advocate for a holistic view, stressing that while heart conditions can be treated medically, systematic recognition and prevention of delirium are crucial to prevent long-term cognitive damage.

They note that evidence specifically for cardiovascular patient groups remains limited and call for targeted, prospective studies to develop specific guidelines for prevention and treatment.