Comparison of the Effectiveness of Oral Doxycycline, Homologous Blood and Talc as Pleural Sclerosing Agents in Rats

Background: Parenteral tetracycline is no longer available for pleural sclerosing agent for pleurodesis in Korea due to the discontinuation of the production. The purposes of this study were to determine whether oral doxycycline (ODC) could be used as an effective sclerosing agent for pleurodesis, and to compare the effectiveness of ODC to other agents, such as homologous blood and talc. Material and Method: Twenty male rats were divided into four groups (A to D). Following agents were given to each group intrapleurally; 10 $m\ell$/kg of 0.9% saline to group A, 10 mg/kg of ODC to group B, 2 $m\ell$/kg of homologous blood to group e, and 70 mg/kg of talc slurry to group D. All animals were sacrificed 28 days after instillation. The pleural spaces were assessed grossly and microscopically and were graded from 0 to 3, and the thicknesses of the pleura were measured. Result: The gross score of group A was 0.0, group B was 1.4$\pm$0.9, group e was 1.0$\pm$0.7, and group D was 2.2$\pm$0.8. Significant adhesion were examined in group B and D grossly (p < 0.05). The pleural thickness of group A was 0.7$\pm$0.2 /10$^2$ mm, group B was 1.2$\pm$0.4 /10$^2$ mm, group C was 1.4$\pm$0.4 /10$^2$ mm, and group D was 3.5$\pm$0.9 /10$^2$ mm. Group D showed pleural thickening significantly (p < 0.05). The microscopic score of group A was 1.0, group B was 1.7$\pm$0.5, group e was $1.5\pm$0.4, and group D was 2.8$\pm$0.4. Group B and D showed significant inflammations and depositions of collagen (p < 0.05). Conclusion: ODC showed significant pleurodesis grossly and microscopically, and homologous blood did not show adhesion. Talc was a significant sclerosing agent for pleurodesis causing extensive inflammation and collagen depisotion.

쥐에시 경구 독시사이클린, 동종 혈액, 탈크의 흉막 유착에 대한 비교

배경: 흉막 유착 물질로서 정맥 주사용 테트라사이클린은 국내 생산이 중단되어 더 이상 사용할 수 없게 되었다. 본 연구 목적은 쥐에서 경구 독시사이클린의 흉막 유착 효과를 알아보고, 경구 독시사이클린과 자가 혈액과 탈크의 흉막 유착 정도를 비교하여 임상적인 효용성을 알아보고자 하였다. 대상 및 방법: 20마리의 숫쥐를 5마리씩 네 군으로 나누었다. A군은 0.9% 생리식염수 10 $m\ell$/kg를 한 쪽 흉강에 주입하였고, B군은 경구 독시사이클린 10 mg/kg, C군은 동종 혈액 2 ml/kg, D군은 탈크 70mg/kg을 각각 주입하였다. 28일 후 모든 예를 도살하여, 육안으로 확인한 유착과 조직학적 변화를 0에서 3으로 점수화하여 관찰하고, 흉막의 두께를 비교하였다. 걸과: 육안으로 관찰한 A군은 0.0점, B군 1.4$\pm$0.9점, C군 1.0$\pm$0.7점, D군은 2.2$\pm$0.8점이었고, B군과 D군은 유의한 흉막 유착을 보였다(p<0.05). 흉막 두께는 A군이 0.7$\pm$0.2 /$10^2$mm, B군 1.2$\pm$0.4/$10^2$mm, C군 1.4$\pm$0.4/$10^2$mm, D군은 3.5$\pm$0.9/$10^2$mm이었고, D군은 유의한 흉막 비후를 보였다(p<0.05). 조직학적으로 A군은 1.0점, B군 1.7$\pm$0.5점, C군 $1.5\pm$0.4점, D군은 2.8$\pm$0.4점이었고, B군과 D군이 유의한 조직학적 변화를 보였다(p<0.05). 결론: 본 연구에서 대조군과 비교하여 경구 독시사이클린은 육안으로,또한 조직학적으로 유의한 흉막 변화를 일으키는 것으로 관찰되었다. 동종 혈액은 흉막 유착 물질로 적당하지 않은 것으로 관찰되었다. 탈크는 경구 독시사이클린과 동종 혈액과 비교하여 조직학적인 유착이 가장 강력한 흉막 유착 물질이었다.