A spine reconstruction rod extender may be used to extend an existing spine reconstruction rod without skipping a pedicle screw in the new construct, exposing the entire old construct, or adding a significant amount of size to the junction between the old and new construct. One embodiment of the present invention relates to a nutritional composition enriched in cysteine for use in the treatment andor prevention of malnutrition and disorders related thereto. A voltage of the electrode is output as a detection signal, when the standard voltage is applied to the electrode.