Construction of a predictive model for estimating the insertion length of peripherally inserted central catheter in very low birth weight infants
10.3760/cma.j.cn211501-20241024-02919
- VernacularTitle:极低出生体质量儿下肢PICC置管长度预测公式的构建
- Author:
Jiaxin LI
1
;
Yubing DONG
;
Aifen CAO
;
Shan JIANG
;
Yingsui HUANG
;
Yun LONG
;
Xiaoyun XIONG
Author Information
1. 山西中医药大学护理学院，晋中 030619
- Publication Type:Journal Article
- Keywords:
Body mass index;
Infant, very low birth weight;
Peripherally inserted central catheter;
Insertion length
- From:
Chinese Journal of Practical Nursing
2025;41(34):2709-2713
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To develop a formula correlating body weight and the insertion length of peripherally inserted central catheters (PICC) in very low birth weight infants (VLBWI) undergoing lower limb PICC placement, aiming to improve the success rate of one-time catheter placement.Methods:A prospective research method was adopted, 205 VLBWI patients who were hospitalized in the NICU of Shenzhen Maternal and Child Health Hospital from May 2023 to February 2024 and had indwelling PICC in the lower extremities were selected as the research subjects using the convenience sampling method. Data including gender, insertion vein, body weight on the day of catheterization, and the vertical distance from the puncture site to the first popliteal crease were collected. Pearson correlation analysis and linear regression analysis were used to construct a predictive formula for estimating the insertion length of PICC based on body weight. The Bland-Altman plot was applied to evaluate the consistency between the predicted insertion depth using the formula and the actual correct insertion length.Results:A total of 182 VLBWI were included in the study, comprising 102 male infants and 80 female infants. The catheterization sites were the right lower extremity in 166 cases and the left lower extremity in 16 cases. The body weight was (1.08 ± 0.26) kg. The vertical distance from the puncture site to the first popliteal crease was (5.58 ± 1.72) cm. The prediction formula for the length of lower extremity PICC catheterization was constructed through linear regression analysis: PICC insertion length = 8.013 + [5.194×body weight (kg)] ± vertical distance from the puncture site to the popliteal crease (cm). Consistency evaluation showed good agreement between the predicted insertion depth and the actual correct insertion length, with 95% of the measurement differences falling within the limits of agreement. The mean difference was 0.07 cm ( P > 0.05). Conclusions:The weight-based formula derived for VLBWI provides a basis for predicting the optimal insertion length of PICC in clinical practice.
