Figure 6.

(a) Intracellular pH measurements obtained using the ratio between ${\text{HCO}}_3^{-}$ and CO₂ from a mid‐ventricular slice. Images are cropped to a 30x30 mm² FOV. The scale bar indicates 1 cm. The ¹³C images are taken from a single time point, 20 seconds after the start of injection. (b) Increased cardiac workload results in decreased apparent pH_i in the healthy heart.