ζέσιν τοῦ περὶ καρδίαν αἵματος καὶ θερμοῦ → surging of the blood and heat round the heart
cf. κακκάω. κἀκεῖ, κἀκεῖθεν, κἀκεῖνος, Att. crases for καὶ ἐκ-.