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Table 3 Result summary

From: Investigating the physiology of normothermic ex vivo heart perfusion in an isolated slaughterhouse porcine model used for device testing and training

Figure

Interpretation

Figure 4

− Hypertrophic cardiomyopathy, a general observation in the use of slaughterhouse hearts (before)

− Swelling of the cardiac tissue during reperfusion (after)

Figure 5

− Diminishing cardiac functions, possibly due to the initiation of waste product intoxication, reduction of essential nutrients, ion imbalances, cardiac necrosis and, most likely lastly, reperfusion injury and inflammation

Figure 6

− Hyperpotassemia (b), hypermagnesemia (g) and hyperphosphatemia(c) due to cardiac necrosis and washout of cardioplegia

− Hypersodemia (a) due to sodium bicarbonate administration (pH balancing), while calcium chloride was administered to counterbalance the calcium reduction caused by bicarbonate, resulting in hypercalcemia (f) and hyperchloremia (e)

− Hyperosmolarity (d) due to increase of ions

Figure 7

− General physiological aerobic cardiac metabolism, supported by free fatty acid (c) uptake and lactate (b) as well as glucose (a) metabolism

− Amino acid catabolism, confirmed by rise of ammonia (d)

− Decrease of essential cardiac nutrients (e.g. free fatty acids) and increase of toxic waste products (e.g. ammonia) over time

− Rise of lactate after 180 min signalizes ischemia and acidosis

− Hyperuremia (e)

− Hypercreatininemia (f)

− Static triglycerides (g) verifies the exclusion of fluid evaporation as a cause for the ion increase

Figure 8

− Hypoalbumia (a) due to blood dilution and potential cause for edema

− Slight elevation of free hemoglobin (b) caused by the centrifugal pump

− Hypercalcitriolemia (c)

− Inconspicuous pH (e) and base excess(d) values and atrial oxygenation (f)

Figure 9

− Severe cardiac necrosis possibly due to reperfusion injury and inflammation and, heterogeneous cardioplegia delivery in the slaughterhouse

Figures 10 & 11

− Physiological electrical activities of hearts during working mode

− Unaltered electrical conduction pathways