The chemical findings in the blood of 6 dogs with closed-loop obstruction of the upper jejunum are reported.

The duration of life with closed loops is less than with simple obstruction.

All animals showed a marked rise in non-protein nitrogen and urea nitrogen, and fall in chlorides. Usually the C02 combining power of the plasma is increased.

The findings in closed-loop obstruction are essentially the same as in simple intestinal obstruction.

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