Faisabilité d’un protocole optimisé d’injection de Produit de Contraste Iodé à faibles doses lors de l’Angioscanner thoracique : une étude quasi-expérimentale à Yaoundé

Auteurs

  • jfnwatsock@yahoo.ca
  • NWATSOCK Joseph-Francis
  • TOUMKO-TAGNE Paule Elvira
  • ONANA Yannick
  • BIONBOGUE Rachel
  • DONGMO POUFONG Juvénal
  • JUIMO Alain-Georges

DOI :

https://doi.org/10.55715/jaim.v18i2.959

Résumé

Background and Objectives. Justification and optimization are the basis for the use of iodinated contrast agents (ICA). We report here on an evaluation of thoracic CT angiography outcomes of a protocol based on the injection of low-dose ICA with voltage reduction duringin our setting.

Materials and Methods. We conducted an analytical audit of an ICA injection protocol implemented since June 2025 for thoracic CT angiography indicated for pulmonary embolism. Examinations performed 3 months before and 3 months after the introduction of this protocol were evaluated including pulmonary artery opacification level as primary endpoint and radiation dose as secondary endpoint. The compiled data were analyzed with a significance threshold of p<0.05.

Results. A total of 58patients fulfilled the inclusion criteria (29 before and 29 after the protocol implementation). The mean age was 58.3±17.2 years, with patients over 60 accounting for 51.7%. The sex-ratio was 0.93M/F and the mean weight was 81.1±25.1 kg. The ICA volume and the quantity of iodine injected were significantly lower in group 2, where up to 27.6% of patients received less than 24g of iodine compared to group 1 (0%, p=0.001). As for the primary endpoint, vascular opacification was greater than 300 HU in 86.7% of cases in group 2 versus 51.7% in group 1, with higher average densities in group 2 (487.9±175.8 versus 318.9±107.4 HU; p=0.005). The radiation dose was lower in group 2 with DLPs of 81.7±69.4 versus 179.5±130.3 mGy.cm (p=0.001). The mean voltage used was 93.9 kV in group 1 and 81.4 kV in group 2 (p=0.001). An injection rate more than 4 ml/s (p=0.041) and a low voltage between 75 and 90 kV (p=0.001) were associated with high vascular density. Conversely, a patient weight ≥94kg was associated with suboptimal opacification (p=0.015) in both groups.

Conclusion. The proposed protocol based on a dose calculation relying on an iodine load of 0.4g/kg, a maximum iodine quantity of 28 g, and a voltage reduction to 80 kV, can be applied in our setting with adequate opacification quality and low radiation exposure. Increased awareness regarding dose calculation and kilovoltage reduction remains necessary for better implementation of this protocol.

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Publiée

2026-04-01

Comment citer

TALLA FOGANG Roméo, NWATSOCK Joseph-Francis, TOUMKO-TAGNE Paule Elvira, ONANA Yannick, BIONBOGUE Rachel, DONGMO POUFONG Juvénal, & JUIMO Alain-Georges. (2026). Faisabilité d’un protocole optimisé d’injection de Produit de Contraste Iodé à faibles doses lors de l’Angioscanner thoracique : une étude quasi-expérimentale à Yaoundé. Journal Africain D Imagerie Médicale (J Afr Imag Méd) Journal Officiel De La Société De Radiologie d’Afrique Noire Francophone (SRANF), 18(2). https://doi.org/10.55715/jaim.v18i2.959