Postoperative hallucinations cardiac surgery are a frequent but often overlooked complication that significantly impacts patient recovery. A recent multicenter prospective study, known as the VAACS study, has provided new insights into how hypertension (HTN) modifies the risk factors for these neuropsychiatric events. While the overall incidence of hallucinations remains similar between hypertensive and non-hypertensive groups, the specific independent predictors vary significantly based on the patient's vascular status.

Predictors of Postoperative Hallucinations Cardiac Surgery in Hypertensive Patients

Researchers found that in hypertensive patients, visual hallucinations were primarily predicted by a higher EuroSCORE II. This score reflects increased baseline surgical risk and clinical complexity. Additionally, patients undergoing heart valve surgery rather than coronary artery bypass grafting (CABG) faced a higher risk of these sensory disturbances. Interestingly, for auditory hallucinations, hyperlipidemia emerged as a significant independent predictor within this hypertensive group. Consequently, clinicians should maintain a higher index of suspicion for patients with complex cardiac histories and lipid imbalances.

Contrast with Non-Hypertensive Cohorts

Conversely, the predictors for patients without hypertension were markedly different. For this cohort, the duration of anesthesia served as the primary independent predictor for visual hallucinations. This suggests that the physiological stress of prolonged anesthetic exposure plays a larger role when cerebrovascular autoregulation is presumably more intact. Furthermore, hyperlipidemia was identified as a common predictor for visual hallucinations in non-hypertensive individuals, highlighting the importance of metabolic health across all patient types.

Medical teams must recognize these distinct risk profiles to improve early detection and intervention. By tailoring postoperative monitoring based on a patient's hypertensive status and surgical complexity, providers can better manage neuropsychiatric outcomes. Ensuring a quiet environment and reorienting patients early may mitigate the distress caused by these episodes and improve overall patient satisfaction.

Frequently Asked Questions

Are postoperative hallucinations the same as delirium?

While hallucinations are often a component of delirium, many patients experience isolated hallucinations without meeting the full clinical criteria for delirium. Hallucinations are sensory perceptions without external stimuli, whereas delirium involves a broader disturbance of consciousness, attention, and cognition.

How long do these hallucinations typically last?

Most postoperative hallucinations occur within the first seven days following surgery. They usually resolve within a few days as the effects of anesthesia and acute physiological stress diminish, though the psychological impact may persist longer.

Disclaimer: This content is for informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

1. Abu Khadija H et al. Predictors of postoperative visual and auditory hallucinations in hypertensive vs. non-hypertensive cardiac surgery patients: insights from the prospective multicenter VAACS study. J Cardiothorac Surg. 2026 Jun 16. doi: 10.1186/s13019-026-04396-z. PMID: 42304176.
2. Ottens TH et al. Hallucinations after cardiac surgery: A prospective observational study. Medicina. 2020;56(3):104.
3. Abu Khadija H et al. Hyperlipidemia and Postoperative Hallucinations After Cardiac Surgery: Insights from the VAACS Cohort Study. J Cardiothorac Surg. 2026.