Fig. 4.

Various examples of the effects of H₂S and MB on cardiac function (end-systolic and end-diastolic diameters) determined by echocardiography (TM in A) and in 2D (B and C) in the same rat. Note the decrease in contractility and heart rate produced by H₂S (A). B: baseline recordings. C: development of a PEA at the end of sulfide infusion in the same rat. D: illustration of the average change in end-systolic and end-diastolic diameters in the three untreated rats exposed to H₂S for 4.5 min. *P < 0.05.