6278 mmHg
Kilopascal (kPa) and Millimeter of Mercury (mm Hg) are both the units of Pressure. In medical science the pressure is often measured in mm of Hg.
Also,
0.133322387415 kPa equals = 1 mmHg equals
Then,
837 kpa will be equal to = X mmHg
Solving for X,
X = (837 kPa × 1 mmHg) ÷ 0.133322387415 kPa
X = 6278.0153898 mmHg
Or when rounded to 4 significant numbers,
X = 6278 mmHg