University of Wisconsin (UW) solution has been demonstrated to enhance and fill out the preservation of the hepatic.

University of Wisconsin (UW) solution has been demonstrated to enhance and fill out the preservation of the hepatic, pancreatic, renal, and cardiac allografts. Prostaglandin [Esub1] ([PGEsub1]) which has been used to bear pulmonary vasodilatation, has improved preservation in lung transplantation. Experiments were designed to evaluate their potential part in 24-h preservation of the allografts in lung transplantation. Thirty-six dogs underwent left lung transplantation. The donor lung (n = 6 in each group) were flushed with UW solution (group 1 and 2) or modified Euro-Collins (EC) solution (group 3) after [PGEsub1] infusion (500 [micro]g). In clump 1, donor lungs were transplanted immediately. Lung allografts of cluster 2 and 3 were nipping stored (4 [degrees] C) in the same preservation solution for 24 h in the inflated state and then transplanted. The right pulmonary artery and right main bronchus were ligated 1 h after completion of the transplantation, forcing the recipient dogs to survive with the transplanted left lung The recipients were ventilated with an inspired oxygen fraction of 04 and end-expiratory hurry 10 cm [H.sub.2]O. sum of two units dogs died prematurely in assign places to 3, whereas all dogs in arrange 1 and 2 survived the experimental period. The arterial oxygen tension and saturation and dynamic lung compliance were significantly higher in dogs of assign places to 1 and 2. Transplanted lung of form into groups 1 and 2 had significantly lower pulmonary vascular resistance, alveolar-arterial oxygen difference, and wet/dry lung weight ratio. Histologically, pulmonary edema, congestion, sloughing of bronchial mucosa, and peribronchial and peripulmonary arterial hemorrhage were shown in lung of form into groups 3, but not in those of assemblage 1 and 2. Airway mucosa and pulmonary vascular texture were well preserved in lung of assign places to 1 and 2. There was no significant difference between cluster 1 and 2 in lung functions, hemodynamics, or morphologic features. We conclud that [PGEsub1] and UW solution could effectively enlarge lung preservation up to 24 h in this in vivo canine lung allotransplantation model

Although lung transplantation is performed fortunately at a number of center around the world, the inability to keep lungs safely for more than 4 to 6 h exhibits a major impediment to more widespread application.[1] Improved rules of preserving lungs would increase the stock of donor organs and help to make secure the quality of grafts.

Cooling is an essential ingredient of organ preservation. Simple cooling of the lung by the agency of immersion has been satisfactory for up to 55 h[2] chiefly clinical programs currently flush the donor lung within the pulmonary artery with a modified Euro-Collins (EC) solution. Euro-Collins flush solution, having an intracellular electrolyte composition, can save the lungs for up to 6 h[3] However, University of Wisconsin (UW) solution has been demonstrated to enhance and continue the preservation of the hepatic, pancreatic, renal, and cardiac allografts.[4-7] Nevertheless, its potential part in preserving lung allografts remains unclear.[8-10]

Administration of a pulmonary vasodilator agent before flushing of preservation solution has been used. In particular, prostaglandin [Esub1] ([PGEsub1]) has been prov to improve preservation in lung transplantation.[11,12]

In the instant study, the effects of [PGEsub1] and UW solution forward 24-h preservation of cold-stored canine lung were elucidated and were compared with those of EC solution with in vivo canine lung transplantation archetype A canine model of left lung allotransplantation was used, in which the native right pulmonary artery and right main bronchus of the recipient dog were ligated allowing independent assessment of the transplanted lung's function.[13]

MATERIALS AND METHODS

Thirty-six adult hybrid donor dogs were randomly separated into three assign places tos The animals were treated identically excepting that in group 1 and 2 the donor lung were flushed with UW solution (ViaSpan, Belzer, Wis) and in dispose 3 the lungs were flushed with EC solution (with the following concentration (mmol/L): [Na.sup.+], 93; [Ksup+] 108; [C1sup+] 14; [SOsub4sup-2] 8; [HCOsub3]- 93; [POsub4]- 93; [Mgsup[+ or -] 2] 8; and grape-sugar 35 g/L).

All animals received humane care in compliance with the Guide for the Care and Use of Laboratory Animals (National Institutes of Health publication No. 85-23 revised 1985)

[TABULAR DATA OMITTED]

Donor Procedure

The donor dogs (Table 1) were anesthetized intravenously (IV) with 30 mg/kg of pentobarbital after receiving atropine, 06 mg IV, and cephalothin, 1 g IV. They were intubated and ventilated with field air and a tidal turn of 15 ml/kg at a rate of 12 breaths/min. within a left thoractomy, the bilateral pulmonary arteries, main bronchi, and left pulmonary veins were isolated. After IV administration of 5000 U of heparin, a cannula was introduced into the main pulmonary artery. The right pulmonary artery was ligated, and 500 [micro]g of [PGEsub1] in 50 ml of normal saline solution was infused into the left pulmonary artery across 3 to 4 min. The infusion rate was adjusted as be in want ofed to ensure that systemic hypotension did not fall out Thereafter, blood inflow to the main pulmonary artery was occlud The left lung was perfused with EC or UW solution (25 ml/kg 4 [degrees] C) by the and of the left pulmonary artery throughout an average of 5 min, during which the pulmonary artery press was kept less than 20 mm Hg and the lung was ventilated with play air. A 0.5-cm left atriotomy was made forward the left auricle for outpouring of the flushing preservation fluid. The left pulmonary artery and veins were then clamped and divided with a box of left atrium. The lung was inflated with play air at a pressure of 25 to 30 cm [Hsub2]O The bronchus was then clamped and divided, and the lung was submerg in the same preservation solution and stored at 4 [degrees] C for more than 24 h (266 [+ or -] 07 h in assign places to 2 and 25.8 [+ or -] 05 h in assemblage 3, p [greater than] 005) In clump 1, the lung grafts were transplanted immediately after harvest. The time between the attack of flushing and submersion of the lung was called the harvest time. The right lung was then excised and sent for histologic examination as a command lung.

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