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Pulmonary parenchymal alveolar histological study in experimental tracheo-oesophageal malformations
B Karabulut1, I Bostanci, A O Tokat
1Ankara Education and Research Hospital, Departments of Paediatric Surgery, Ankara, Turkey. bilgekar@yahoo.com
Insights
Experimental tracheo-oesophageal malformation (TOM) in rats showed delayed lung maturation. This delayed pulmonary development may explain respiratory issues seen in children after TOM surgery.
Area of Science:
- Developmental Biology
- Pulmonary Medicine
- Surgical Pathology
Background:
- Children undergoing tracheo-oesophageal malformation (TOM) surgery frequently experience postoperative respiratory complications.
- Limited research exists on the underlying causes of these respiratory issues.
Purpose of the Study:
- To investigate the histological basis of respiratory difficulties in experimental TOM.
- To evaluate lung alveolar development in a rat model of TOM.
Main Methods:
- An experimental TOM model was created in Wistar albino rats using adriamycin during gestation.
- Control and sham groups were included for comparison.
- Lung alveolar histology, including Type-1 cell ratio, capillary density, and air space percentage, was analyzed under light microscopy.
Main Results:
- Rats with experimentally induced TOM exhibited significantly lower Type-1 cell ratios and air space percentages compared to control and sham groups.
- No significant differences in capillary density were observed between the groups.
- These findings indicate delayed lung alveolar maturation in the TOM model.
Conclusions:
- Experimentally induced TOM in rats leads to delayed pulmonary parenchyma maturation.
- This delayed maturation is a potential cause for the respiratory system pathologies observed in children with TOM.
- Further research is warranted to fully understand the implications and mechanisms.
Objective:
Children operated on for tracheo-oesophageal malformation (TOM) often suffer from postoperative respiratory system difficulties. There is little current literature about this subject. This study aimed to investigate the causes of these problems in rats with experimental TOM by evaluating the lung alveolar histology.
Subjects And Methods:
Twenty Wistar albino rats were used for the experiment. Twelve rats with a sperm positive vaginal smear received 1.75 mg/kg intraperitoneal adriamycin on days six to nine of gestation. A sham group was infused with saline instead of adriamycin. A control group was not subjected to any additional procedure. Their fetuses were dissected under surgical microscope. After examining the trachea and oesophagus, the lungs were dissected and fixed in 10% formalin. The groups were compared with respect to alveolar flat cell (Type-1), capillary density and air space percentage in the samples obtained under light microscopy. Statistical evaluation was performed through Mann-Whitney-U tests and Pearson Chi-squared tests.
Results:
Type-1 cell ratio and air space percentage were the highest for the control and sham groups. However, the group that received adriamycin and developed TOM had the lowest values. There were no statistically significant differences between the groups with respect to capillary density.
Conclusion:
In rats with experimentally produced TOM, the pulmonary parenchyma showed delayed maturation. This could be the cause of the frequently seen respiratory system pathologies in children suffering from TOM. Further studies should be done to elucidate this.
