• Journal of Chest Surgery
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• 제35권4호
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• pp.255-260
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• 2002

배경: 흉부 및 흉복부 대동맥 수술시에 발생하는 척수의 허혈성 손상에 의한 신경학적 합병증은 발병 전의 예측이 어려울 뿐만 아니라 중증의 장애를 남기게 된다. 본 연구에서는 허혈성 심근 질환 치료에 쓰이고 있는 Trimetazidine(이하 TMZ)의 척수의 허혈성 손상에 대한 보호 효과를 동물실험모델에서 실험하였다. 대상 및 방법: 다 자란 New-Zealand White Rabbits 33마리를 대조군(Group 1, N-17)과 실험군(Group 2, N=16)으로 나누어 실험하였다. 수술은 대조군에서는 전신마취 후 정중개복하여 좌측 신동맥 기시 직하부위에서 복부대동맥을 혈관 점자로 30분간 폐쇄하여 척수 허혈을 유발하였으며, 실험군에서는 TMZ 3mg/kg을 대동맥 겸자전 투여하였다. 수술 2시간 후, 24시간 후, 48시간 후에 Modified Talrov scale에 의한 운동능력을 평가하였으며 술 후 48시간에 요천추부 척수를 적출하여 조직검사를 시행하였다. 결과: 대조군과 실험군에서 각각 7 마리(17마리 중 10마리 사망)와 11마리(16마리 중 5마리 사망)가 실험 종료가지 생존하여 척수 조직을 채취하였다. Modified Talrov scale은 대조군과 실험군에서 각각 수술 2시간 후 1.13 $\pm$ 1.25와 3.20 $\pm$ 0.77, 24시간 후 1.45 $\pm$ 1.57와 3.50 $\pm$ 0.76, 48시간 후 1.86 $\pm$ 1.86와 3.91 $\pm$ 0.30이었다(p$\leq$0.05). 척수의 조직학적 검사에서는 신경학적 결손이 큰 대조군(Group 1)의 척수조직에서 허혈성 손상이 더 심하게 일어난 것이 관찰되었다. 결론: TMZ은 동물실험에서 척수의 일과성 허혈성 손상에 대하여 통계적으로 유의한 척수 보호효과를 나타내었다.

• Archives of Pharmacal Research
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• 제27권6호
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• pp.646-652
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• 2004

The objective of this study was to determine the acute effect of trimetazidine (TMZ) on the pre-fatigue, fatigue and post-fatigue contractile characteristics and tension-frequency relationships of isolated rat diaphragm muscle. Muscle strips were taken from the ventral-costal aspects of the diaphragm muscle of rats killed by decapitation. The muscle strips were suspended in organ baths containing Krebs solution, with a gas mixture of 95% $O_2$ and 5% $CO_2$ at $37^{\circ}C$ and pH 7.35-7.45. After determining the thermoregulation and optimum muscle length the muscles were subjected to direct supramaximal stimulation with 0.05 Hz frequency square pulses for periods of 0.5 msec to obtain control values. After adding $5{\times}10^{-6}{\;}and{\;}5{\times}10^{-5}$ M trimetazidine solution to the respective bath media, the contractile parameters of the muscles were recorded. The contractile parameters were also recorded for both the trimetazidine and tri-metazidine-free media after application of the high frequency fatigue protocols. Later, the tension-frequency relationship was determined by applying stimulating pulses of 10, 20, 50 and 100 Hz to the muscle strips. Whilst the twitch tension obtained from the $5{\times}10^{-6}{\;}and{\;}5{\times}10^{-5}$ M trimetazidine media showed numerical increases compared to that of the controls, these were not statistically significant (p>0.05). The contraction time exhibited a dose dependent increase (p<0.001), whilst the contraction and relaxation rates did not differ significantly. The isometric contraction forces obtained with the different stimulating frequencies showed a significant increase in the tetanic contraction only at 100 Hz (p<0.05). A comparison of the pre- and post-fatigue twitch tensions in the trimetazidine media showed the post- fatigue twitch tensions to be significantly higher than those of the pre-fatigue contraction forces (p<0.05). In the $5{\times}10^{-6}{\;}and{\;}5{\times}10^{-5}$ M trimetazidine media the increases in the post-fatigue contraction force were 22 and 30%, respectively. These results demonstrated that in isolated rat diaphragm muscle, TMZ significantly limited the mechanical performance decrease during fatigue. It is our opinion that trimetazidine contributed to the observed fatigue tolerance by eliminating the factors of fatigue, due to preservation of intracellular calcium homeostasis, provision of the ATP energy levels needed by ATPase dependent pumps and especially by keeping the intracellular pH within cer-tain limits.