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Length of pressure-controlled reperfusion is critical for reducing ischaemia-reperfusion injury in an isolated rabbit lung model
© Guth et al; licensee BioMed Central Ltd. 2007
Received: 21 January 2007
Accepted: 07 December 2007
Published: 07 December 2007
Ischaemia-reperfusion injury is still a major problem after lung transplantation. Several reports describe the benefits of controlled graft reperfusion. In this study the role of length of the initial pressure-controlled reperfusion (PCR) was evaluated in a model of isolated, buffer-perfused rabbit lungs.
Heart-lung blocks of 25 New Zealand white rabbits were used. After measurement of baseline values (haemodynamics and gas exchange) the lungs were exposed to 120 minutes of hypoxic warm ischaemia followed by repeated measurements during reperfusion. Group A was immediately reperfused using a flow of 100 ml/min whereas groups B, C and D were initially reperfused with a maximum pressure of 5 mmHg for 5, 15 or 30 minutes, respectively. The control group had no period of ischaemia or PCR.
Uncontrolled reperfusion (group A) caused a significant pulmonary injury with increased pulmonary artery pressures (PAP) and pulmonary vascular resistance and a decrease in oxygen partial pressure (PO2), tidal volume and in lung compliance. All groups with PCR had a significantly higher PO2 for 5 to 90 min after start of reperfusion. At 120 min there was also a significant difference between group B (264 ± 91 mmHg) compared to groups C and D (436 ± 87 mmHg; 562 ± 20 mmHg, p < 0.01). All PCR groups showed a significant decrease of PAP compared to group A.
Uncontrolled reperfusion results in a severe lung injury with rapid oedema formation. PCR preserves pulmonary haemodynamics and gas exchange after ischaemia and might allows for recovery of the impaired endothelial function. 30 minutes of PCR provide superior results compared to 5 or 15 minutes of PCR.
Since the middle 1980s lung transplantation (LTX) has become an accepted treatment option for patients with end-stage pulmonary disease, but ischaemia reperfusion (IR) injury of the pulmonary graft is still a serious early problem after LTX .
Ten to 20% of transplanted lung allografts develop a severe graft dysfunction (IR-injury) that yields to a high early mortality and ongoing morbidity [2–6]. The clinical features are pulmonary oedema with diffuse infiltrates in the chest radiographs, decreased lung compliance (CL), progressive hypoxaemia, and an increased pulmonary vascular resistance (PVR) [7, 8]. Histological examinations show alveolar damage, interstitial oedema and sequestration of neutrophils . Waddell and others reported that IR-injury predisposes grafts to early rejection by up-regulation of class II major histocompatibility antigens , chronic bronchiolitis obliterans syndrome resulting in graft failure .
In the past multiple methods of graft preservation [8, 12–14] have been evaluated. However, the major injury may occur within the first minutes of reperfusion [15–17]. Interventions in the early reperfusion period, for example inhalation of NO , suppression of neutrophils [9, 18], decrease of oxygen radical generation , and pressure-controlled reperfusion (PCR)  showed favourable effects on IR-injury. Despite the documented effectiveness of this approach after myocardial ischaemia  or ischaemia of the lower extremities [20, 21] equivalent data about controlled reperfusion of the lungs are rare. In other reports beneficial effects of controlled reperfusion by changing the compounds of the first line perfusate solution [22, 23] and leukocyte depletion [9, 22, 24] were described. In rats  and in rabbits  it was reported that PCR improved lung function after ischaemia. PCR was previously studied in rats following 24 hours cold ischaemia, but has not been investigated following warm ischaemia .
In this model of an isolated buffer-perfused rabbit lung the effects of different PCR periods on IR-injury following warm hypoxic ischaemia were studied.
Sterile Krebs-Henseleit buffer (KHB, Serag-Wiessner, Naila, Germany) was used. The buffer contained (in mM) 125 NaCl, 4.3 KCl, 1.1 KH2PO4, 2.4 CaCl2, 1.3 MgCl2, and 13.3 glucose; NaHCO3 was adjusted for a constant pH in the range of 7.35–7.45. Gas mixtures for ventilation containing 95%O2/5%CO2, 5%CO2/95%N2 and 5%CO2/6%O2/89%N2 were obtained from Linde Gas AG (Düsseldorf, Germany).
The study was performed in accordance to the German laws for animal health and protection declaration and was approved by the local authorities, Government of Rheinlandpfalz (Reg.-Nr.: 177-07/991-3). We used male White New Zealand rabbits of 2500–4000 g body weight (conventional, normally fed ad libitum; Charles River, Kisslegg, Germany). All animals received human care in compliance with the European Convention on Animal Care.
Lung preparation and experimental setup
Rabbits were anaesthetized with intramuscular xylazine (5–10 mg/kg) and pentobarbital (30 mg/kg) via an ear vein. Tracheal intubation was performed through a tracheostomy and mechanical ventilation was started (Ventilator, Hugo Sachs Electronics Harvard Apparatus, March, D) with room air at a tidal volume of 10 ml/kg and a rate of 50 breaths per minute. The positive endexpiratory pressure (PEEP) was adjusted to 2 cm H2O.
Following a median sternotomy and thymectomy the pericardium was incised and the pulmonary artery (PA) and the aorta were dissected free and encircled.
Two purse string sutures were placed into the free walls of the right and left ventricle and heparin was administered intravenously (500 U/kg). The PA and the left atrium (LA) were cannulated via the right and left ventricles. The aorta was ligated and the PA-cannula sutured tightly avoiding perfusate backflow. Perfusion with sterile KHB was started. Room air ventilation was changed to a gas mixture of 95% oxygen and 5% carbon dioxide to preserve the physiological acid-base balance. The lungs were excised while being ventilated and perfused with buffer solution. After rinsing the lungs with 400 ml buffer solution for washout of blood, the perfusion circuit was closed for recirculation (total volume of 500 ml). The flow was adjusted to 100 ml/min without exceeding a PA pressure of 5 mmHg. The left artrial pressure was set at 2 mmHg.
After a stabilisation period all baseline values were assessed. Perfusion solution of the inflow and the outflow was sampled for gas and pH analysis. Mean pulmonary arterial and venous pressures (PAP, PVP), perfusate flow (FP), tidal volume (VT) and inspiratory and endexpiratory pressures (PI, Peep) were measured. Pulmonary vascular resistance (PVR) and compliance of the lung (CL) were calculated in real-time. Microvascular pressure (PC) was determined by the arterial and venous double occlusion technique [27, 28]. Occlusion manoeuvres were performed in end-expiration with electromagnetic tube-clamping devices, synchronised by a D/A-A/D converter connected to a personal computer. This converter allowed parallel data collection at a rate of 100 Hz, further processed by an analysis program (GraphPad Prism version 4.00 for Windows, GraphPad Software, San Diego, CA USA).
Vascular compliance was determined by venous occlusion technique (occlusion time, 1 s). After the early steep increase a constant low increase of pressure was detected. The reciprocal value of this slope of the low pressure increase multiplied with the known perfusion flow allows calculating the vascular compliance.
Lungs included in this study had a homogeneous white appearance without signs of oedema or atelectasis. Further, they had pulmonary artery pressures and lung compliance in the normal range, and were stable during a steady state period of 15 minutes.
25 male New Zealand White rabbits (2.5–4 kg) were randomly assigned to experimental groups (n = 5 in each group):
Control group: no ischaemia
All other groups had 2 hours of warm (38°C) and hypoxic ischaemia (PO2 = 50–60 mmHg)
Group A: no pressure-controlled reperfusion (PCR), i.e. reperfusion by baseline flow
Group B: 5 minutes of PCR followed by baseline flow
Group C: 15 minutes of PCR followed by baseline flow
Group D: 30 minutes of PCR followed by baseline flow
Group A lungs were immediately reperfused by the baseline flow within 15 seconds. In groups B to D the reperfusion started pressure-controlled limited to a maximum perfusion pressure of 5 mmHg for the period of PCR. Thereafter lungs were perfused using baseline flow. Measurements followed immediately at the beginning (0 minute) and after 5, 15, 30, 60, 90 and 120 minutes of reperfusion. At the end of the experiment lung specimen were frozen in liquid nitrogen and stored at -80°C.
Wet-to-dry weight ratio
Lung wet-to-dry weight (W/D) ratio was used as a measurement of pulmonary oedema. Samples of lung tissue were weighed and a drying period of 48 h at 80°C ensued. The weight immediately following reperfusion and the weight after drying were used to calculate the lung wet-to-dry weight ratio.
Quantitative myeloperoxidase activity was determined using the adapted procedures of Okabayashi and associates . Ten to 15 mg of dry lung tissue were homogenised in 1 ml of 0.5% hexadecyltrimethylammonium bromide, 5 mmol/L EDTA, and 50 mmol/L potassium phosphate buffer (pH 6.2) with a tissue grinder (Ultra turrax T18, Ika, Staufen, Germany). The homogenate was centrifuged at 10,000 g for 15 minutes at 4°C. The supernatant was assayed for total soluble protein by the method of Pierce Laboratories. Fifty microliters of supernatant were combined with 0.6 ml Hanks bovine serum albumin, 0.5 ml of 100 mmol/L potassium phosphate buffer (pH 6.2), 0.1 ml 0.05% H2O2, and 0.1 ml of 1.25 mg/ml o-dianisidine. The optical density was measured at 460 nm (M4QII, Carl Zeiss, Oberkochen, Germany). Colour development from 5 to 20 minutes is linear. Enzyme activity is expressed as the change in optical density units per minute per milligram of tissue protein (δOD/min/mg protein).
All values are expressed as means ± standard deviation. Statistical analysis was performed using the software package GraphPad Prism 4.0 (GraphPad Prism version 4.00 for Windows, GraphPad Software, San Diego, CA, USA). Individual means between groups were compared by 1-way analysis of variance with Bonferroni correction for multiple comparisons. Oxygenation, lung compliance and haemodynamic parameters during the reperfusion period were analysed using 2-way analysis of variance with Bonferroni correction for multiple comparisons. P-values less than 0.05 were considered as significant.
Figure 4B depicts the shapes of PO2 changes over time for all groups starting with the time point of reperfusion by baseline flow. The linear regression functions for group A to C show significant different slopes compared with the control group (p < 0.0001).
Compliance of the lung
Mean pulmonary artery pressure
Pulmonary vascular resistance (PVR)
The differences between groups and within groups at successive time intervals of reperfusion were significant (p < 0.0001). Without PCR (group A) PVR increased progressively (Figure 6B) and reached 755 ± 113% compared with baseline values (p < 0.001). All groups with PCR developed a significant early rise in PVR up to 539 ± 141% (group B), 432 ± 211% (group C) and 682 ± 288% (group D), respectively (p < 0.01). But then in all PCR groups PVR decreased continuously. At the end of the experiment the baseline was reached. Despite a steady decrease of PVR in group D until 15 minutes of PCR a significant elevation with 345 ± 230% of PVR compared with the control group with 113 ± 11% (p < 0.05) was found.
The differences between groups and within groups at successive time intervals of reperfusion were significant (p < 0.0001), reflecting a sharp decrease in vascular compliance (CV). After ischaemia and reperfusion there was a significant decrease in CV (Figure 7B) approximately down to 50% of the baseline values (p < 0.003). After 15 minutes all PCR groups showed improvement in CV. After 90 minutes there was still a lower CV compared to baseline for all PCR groups, but the differences did not reach significance.
Wet-to-dry weight ratio (W/D-ratio)
This study examined the effects of pressure-controlled reperfusion (PCR) on lung IR-injury in a model of warm ischaemia and reperfusion of the isolated buffer-perfused rabbit lung. Uncontrolled reperfusion (immediate restoration of the baseline flow) leads to severe oedema formation, rapid decrease in oxygenation capability (decrease in PO2) and lung compliance (CL). This was accompanied by a massive increase of pulmonary arterial pressure (PAP) and pulmonary vascular resistance (PVR). These findings are in concordance with other studies which also demonstrated severe lung injury after uncontrolled reperfusion in rabbits [14, 26], rats  and pigs . All groups with pressure-controlled reperfusion showed less damage in early lung function similarly to other reports [22, 25, 26, 32].
The aim of this study was to investigate the optimal length of PCR to reduce IR-injury. It is clearly shown that 30 minutes of PCR (group D) were superior in attenuating the early IR-injury of the lungs. Only lungs in group D remained a high oxygenation capacity, developed only a slight decrease in CL and showed the lowest values of PAP and PVR. But vascular compliance (CV) declined in all ischaemic groups compared with baseline suggesting some endothelial dysfunction.
Shorter periods of PCR were less effective in protecting the lungs against IR-injury probably because of severe endothelial dysfunction and lung function progressively worsened.
These data suggest that endothelial permeability in the ischaemic lung was at least increased during the first 15 minutes. Therefore, controlled early reperfusion pressure in our model should exceed 15 minutes. After that time recovery of the endothelial function is satisfactory to prevent the lungs from severe oedema formation.
Our results are in contrast to the data from Bhabra and colleagues  who reported in a rat transplantation model that already 10 minutes of PCR prevented the lungs from severe IR-injury. The main differences to our model are (1) the use of a whole animal model, (2) cold storage of the lungs before reperfusion, (3) positive versus negative pressure ventilation, and (4) a different species. So, these reasons may contribute to the difference in the periods of PCR that are necessary for an effective lung protection. Fiser and others showed in rabbits some improvement of lung function after pressure-controlled reperfusion, but this period lasted for only 5 minutes and this was not enough to preserve the oxygenation capability of the lungs .
IR-injury remains a major threat in clinical lung transplantation [2, 6, 7, 11, 16, 34]. Although we do not know the exact mechanisms of this phenomenon, clinical studies have suggested that patients with pre-existing pulmonary hypertension are at increased risk for reperfusion injury after lung transplantation [31, 32, 35].
Recently, studies described endothelial cell damage as a trigger that leads to total organ failure, but the cause of this injury is multifactorial [16–18, 36]. One important cause is the renewed oxygen supply to the ischaemic organ during early reperfusion provoking formation and activation of various humoural mediators of injury and inflammation . These humoural factors cause an early endothelial dysfunction that leads to marked decline in nitric oxide and prostaglandin release .
In addition, an increased hydrostatic gradient across endothelial membranes increases the reperfusion injury in patients with pulmonary hypertension. The accompanying endothelial disruption results in collagen exposure, which may activate leukocytes against the lung tissue and contribute to the severe lung damage [9, 37].
Controlled organ reperfusion is well known and several experimental studies have been performed to minimize the IR-injury [22, 25, 30, 37–39]. Most have centred on adding substrate to the flush solution, such as oxygen-derived free radical scavengers , agents that block neutrophil-endothelial interactions [9, 40], endothelial protective agents , or haemodilution .
Other reports focus on manipulating the onset of reperfusion. Allen et al. described the beneficial effect of regional substrate-enriched blood cardioplegic reperfusion after 4 hours of warm regional ischaemia of the heart . Also in acute limb ischaemia application of controlled reperfusion lessened the reperfusion response [20, 21]. Some reports described the effect of controlled reperfusion in lung ischaemia. In these studies the authors have shown that reperfusion with low initial PAP at least partially decreased IR-injury [25, 26, 32, 42, 43]. But in these experiments PCR was almost only one part in the concept of controlled reperfusion and it was combined with other methods like leukocyte depletion, adding protective agents, or varying the composition of the perfusate solution. So, the importance of the length of PCR is not clear in the concept of controlled reperfusion.
In our study we focused only on the length of PCR. So, we were able to determine the effects of PCR on ischaemic lungs unaffected by other therapeutic options.
With different periods of PCR lungs showed a gradually improved function with only slight damage in group D. But especially figures 6B and 7A depict that after 30 minutes of PCR there was also a significant decrease in perfusate flow and an increase in PVR suggesting still a functional injury of the vasculature.
The intrapulmonary leukocyte pool and blood leukocytes are considered as a trigger of IR-injury [24, 44–46]. Although many investigations have confirmed the role of neutrophils in reperfusion injury [9, 24, 44, 47], other have questioned neutrophil involvement . One report of Fiser et al. could show that in the earliest phase of reperfusion injury the donor (resident) pulmonary leukocyte pool plays an important role . They blocked the pulmonary macrophages with Gadolinium chloride, a rare lanthanide earth salt, which significantly attenuates at least the earliest phase (30 min) of reperfusion injury. In our experiments we were able to focus on the intrapulmonary leukocyte pool because perfusion consisted of KHB-solution adding no other blood cells.
The lung capillaries harbour large pools of immunocompetent cells. Neutrophils represent the largest intracapillary population followed by lymphocytes and monocytes . Interestingly, we could show that after 30 min of PCR myeloperoxidase activity was significantly higher compared with lungs without PCR signalling that much more resident leukocytes were present in these less harmed lungs. So, one might speculate that long-lasting PCR prevents the intrapulmonary leukocytes against activation which attenuates reperfusion injury.
At the moment, the effects of PCR during early reperfusion are not well understood. The reduced perfusion pressure (1) might decrease endothelial disruption, (2) prevent activation of resident intrapulmonary leukocytes (3) stabilize the endothelial function, and (4) improve restoration of normal endothelial and muscular integrity. This might be important in all patients with marked pulmonary hypertension, especially after LTX for primary or secondary pulmonary hypertension . Future experiments should focus on the endothelial muscular integrity of the pulmonary vasculature to further elucidate the mechanisms of PCR.
Like other animal models our model has limitations. First, we used the isolated buffer-perfused rabbit lung and not a whole animal model. But the advantages are (1) focusing on the lung, (2) constancy of circulatory and ventilatory parameters, and (3) avoidance of immunological phenomena that could not be ruled out in whole animal transplantation models.
Further, we are using the model of warm hypoxic ischaemia in contrast to the standard of cold ischaemia in LTX. However, a recent report from Warnecke and co-workers inferred no qualitative difference between these two types of ischaemia . So both models are utilizable in experiments focusing on IR-injury.
Our results strongly recommend to applicate PCR after prolonged lung grafts ischaemia. In our study at least 15 to 30 minutes of PCR are required to guarantee a satisfactory organ function. In the clinical setting this is obviously time-consuming, but adding other modalities like inhalative application of prostaglandins, or application of poly-ADP ribose synthetase inhibitors to the concept of pressure controlled reperfusion may further ameliorate IR-injury of the lungs. Combining several factors of controlled reperfusion should lessen the necessary length of PCR. Several measures of controlled reperfusion can hopefully reduce lR-injury of the lungs and may decrease the risk of LTX. The pool of possible organ donors may be extended.
Our study demonstrates the positive effects of PCR on pulmonary IR-injury. The length of PCR is critical for early lung function and a period of 30 minutes is effective to keep acceptable oxygenation ability. But recovery of the endothelial muscular function of the pulmonary vasculature was not complete. Further experiments are warranted to discover the synergistic effects of PCR with other protective strategies and to clarify the positive effects on the pulmonary vasculature.
We thank Jutta Buehler for expert technical assistance.
This study was generously supported by grants from the Robert-Müller-Stiftung and MAIFOR.
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