Behavior of biometric parameters during clinical hours
M Atar-Vardi1, B Dubinsky-Pertzov1, A Shemer1
1Department of Ophthalmology, Shamir Medical Center, Zerifin, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
Purpose:
To evaluate and quantify variation of biometric parameters - axial length (AL), anterior chamber depth (ACD), central corneal thickness (CCT) and white-to-white (WTW).
Methods:
A population-based retrospective cohort study was performed on patients who underwent a biometry test prior to cataract surgery using the IOL Master 700 (Carl Zeiss Meditec, Jena, Germany) between the years 2017-2021. Differences in these parameters were evaluated between scans executed at different times of the day.
Results:
21,975 examinations of 8611 patients were included. Mean age was 70.50±12.56years. The mean time of the biometry exams was 10:52±1:23 AM. Measurements of AL, ACD, CCT and WTW were tested hourly and grouped between 7:00-9:00 AM and 12:00-03:00 PM. All the parameters showed a diurnal increase with a significance of P<0.001 (AL from 23.64±1.5 to 24.01±1.76mm; ACD from 3.29±0.67 to 3.35±0.64mm; CCT from 0.52±0.04 to 0.53±0.04μm and WTW from11.83±0.46 to 11.90±0.51mm). The most significant change was seen in AL. The difference between time groups remained significant in a generalized linear mixed model (P<0.001).
Conclusions:
There are fluctuations in AL, ACD, CCT, WTW measurements during office hours. These results raise questions about the significance of timing of the biometry exam and the effect on the ELP calculation.
Related Concept Videos
01:25Introduction to Vital Signs
Vital signs help healthcare professionals assess an individual's well-being and detect any functional changes...
01:19Guidelines For Measuring Vital Signs
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
01:19Assessing Body Temperature - Temporal Artery
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.
Step 3: Assess the patient's...
01:28Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
01:14Assessing Body Temperature - Axilla
Step 1: Perform hand hygiene and put on clean gloves to maintain infection control and prevent cross-contamination.
Step 2: Prepare the patient by explaining the procedure to ensure understanding and cooperation. Ensure privacy, expose the axilla, and inform the patient that minimal movement is crucial for an accurate reading.
Step 3: Adjust the patient’s clothing to expose only the axilla. It minimizes...
01:25Errors occurring during blood pressure monitoring
Several factors...