Is the CRP-Albumin-Lymphocyte (CALLY) Index Effective in Predicting Postoperative Delirium in Geriatric Patients Undergoing Hip Fracture Surgery

Ankara Ataturk Sanatorium Training and Research Hospital

Status

Enrolling

Conditions

CRP

Postoperative Delirium (POD)

Lymphocyte

Hip Fracture

Albumin

Treatments

Diagnostic Test: The Diagnostic and Statistical Manual of Mental Disorders (DSM) - 5 criteria for delirium diagnosis

Study type

Observational

Funder types

Other

Identifiers

NCT06818409

2024-BÇEK/195

Details and patient eligibility

About

Introduction: Postoperative delirium (POD) is a common complication in elderly surgical patients and is significantly associated with prolonged hospital stays, cognitive impairment, functional decline, and increased mortality rates within 6 to 12 months. Its incidence has been reported to range between 10% and 70%, depending on the diagnostic criteria used, the population studied, and the type of surgical procedure performed. The incidence is particularly higher following vascular, cardiac, and hip fracture surgeries.

According to the 2024 updated guidelines by the European Society of Anaesthesiology and Intensive Care (ESAIC), POD should be screened at least once daily for a minimum of three days, beginning in the post-anesthesia recovery unit, based on the DSM-5 criteria. POD is a complex syndrome associated with various phenotypes and is likely the result of a combination of neuroinflammatory and oxidative stress processes.

Candidate biomarkers for POD include inflammatory parameters (such as interleukins, C-reactive protein [CRP], erythrocyte sedimentation rate, and CD68), dopamine receptors, norepinephrine levels, cortisol levels, genetic biomarkers (e.g., apolipoprotein E4), acetylcholinesterase levels, and albumin levels. However, systemic stress can lead to nonspecific activation of the immune system, resulting in a decrease in lymphocyte count.

Although the relationships between CRP, albumin, and lymphocyte count with POD have been individually investigated in the literature, no study has examined the combined effect of these three parameters. Based on this, we aimed to investigate whether the CRP-Albumin-Lymphocyte (CALLY) Index, a novel index not previously reported in the literature, is effective in predicting POD in geriatric patients with hip fractures. The CALLY Index is calculated using the formula: (Albumin × Lymphocyte) / (CRP × 10⁴).

Aim/Hypothesis:

H₀: The CALLY Index cannot predict the risk of postoperative delirium in geriatric patients undergoing hip fracture surgery.

H₁: The CALLY Index can predict the risk of postoperative delirium in geriatric patients undergoing hip fracture surgery.

Material-Methods:

The following data will be recorded for each patient:

Demographic variables: age, sex, height, weight, and body mass index (BMI)
American Society of Anesthesiologists (ASA) physical status classification
Comorbidities and medication use
Smoking and alcohol consumption history
Preoperative laboratory parameters: obtained from the hospital information system for CALLY Index calculation
Perioperative variables: type and duration of anesthesia, duration of surgery, type of surgical procedure, estimated blood loss, blood product transfusion status, and occurrence of intraoperative adverse events
Postoperative data:
Ward of admission after surgery (orthopedic ward/intensive care unit)
Presence of delirium, assessed twice daily (morning and evening) for three days using DSM-5 criteria, starting in the post-anesthesia recovery unit
Occurrence of postoperative complications
Length of stay in the intensive care unit
Total hospital length of stay
Mortality status

Patients aged 65 years and older who undergo surgery for femoral neck or intertrochanteric fractures will be included in the study. Patients with preoperative delirium, preoperative dementia, pathological or open fractures, systemic or localized infections in the fracture region during the preoperative period, or multiple trauma will be excluded. Additionally, those with a BMI <18.5 or ≥35 chronic organ failure, or advanced-stage cancer will be excluded from the study.

Enrollment

100 estimated patients

Sex

All

Ages

65+ years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

Patients aged 65 years and older who undergo surgery for femoral neck or intertrochanteric fractures

Exclusion criteria

Patients with preoperative delirium
Patients with preoperative dementia
Patients with pathological fractures
Patients with open fractures
Patients with systemic or localized infections in the fracture region during the preoperative period
Patients with multiple trauma
Patients with a BMI <18.5 or ≥35
Patients with chronic organ failure
Patients with advanced-stage cancer