A new international review of medical literature has revealed that delirium, a sudden state of confusion and disorientation, is a significantly underestimated and dangerous complication for patients undergoing cardiac procedures. The study, published in the European Heart Journal, found that delirium is linked to longer hospital stays, increased mortality, and a heightened risk of long-term cognitive decline, even in individuals with no prior cognitive impairment.
Researchers led by the University Hospital Bonn (UKB) in Germany analyzed approximately 1604 studies spanning over three decades to reach their conclusions. The review highlights that complex cardiac surgeries, as well as less invasive procedures like transcatheter aortic valve replacement (TAVR) and percutaneous coronary intervention (PCI), carry a risk of delirium, particularly for elderly patients and those with pre-existing health conditions.
“Delirium is not a marginal problem, but one of the central complications of modern cardiac medicine,” stated Prof. Dr. Dr. Enzo Lüsebrink, a cardiologist at UKB, in a press release. The study emphasizes that delirium extends beyond temporary confusion, potentially leading to lasting neurological damage.
A key challenge in addressing delirium is its frequent misdiagnosis. The “hypoactive” form, characterized by apathy and reduced activity, is often mistaken for age-related decline or simple exhaustion, according to Endrit Cekaj, an assistant physician at the UKB Clinic for Cardiology and co-first author of the study. “Validated and standardized screening instruments…are still far too rarely used routinely in everyday clinical practice,” Cekaj said.
The research underscores the importance of preventative measures. Multimodal, non-pharmacological interventions – including early mobilization, reorientation, maintaining good sleep hygiene, cognitive stimulation, effective pain management, and family involvement – can reduce the incidence of delirium by up to 40 percent. The study authors expressed caution regarding the routine use of medication for prophylaxis.
“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,” explained Prof. Dr. Alexandra Philipsen, Director of the Clinic for Psychiatry and Psychotherapy at the UKB.
The review proposes structured treatment approaches based on the severity of delirium, the clinical setting, and the specific subtype. While non-pharmacological methods remain the cornerstone of treatment, the study notes that the sedative dexmedetomidine may be beneficial in moderate to severe cases within intensive care units. Antipsychotic medications may be considered depending on symptoms, but their use requires careful consideration of potential cardiac side effects.
Despite the growing body of knowledge, the authors acknowledge a lack of specific evidence tailored to cardiovascular patient groups. They are calling for targeted, prospective studies to develop specialized guidelines for both the prevention and treatment of delirium in this population. A related study published in December 2024 in the Journal of Cardiothoracic Surgery identified age, pre-operative depression, and post-operative atrial fibrillation as significant risk factors for delirium following cardiac surgery.
According to the National Institutes of Health, postoperative delirium (POD) is a relatively common occurrence following surgical procedures, particularly cardiac surgeries.