Cover photos: Photos of the Avenue of Pines passing through the Cutfoot Experimental Forest on the Chippewa National Forest in northern Minnesota. Silvicultural studies have been underway in the now 130-year-old red pine forest since 1925. Some portions of this forest have been measured and thinned 10-12 times as part of a research program spanning 80 years.

Six hypoparathyroid patients were treated with oral furosemide for 4 days. All six had a significant decrease in serum ionized calcium level from the control period (4.05 +/- 0.31 mg/dl) to the furosemide period (3.46 +/- 0.26 mg/dl, P less than 0.005). In five patients, the decrease in serum ionized calcium concentration occurred in association with an increase in urinary calcium excretion. Although serum immunoreactive parathyroid hormone level increased in five patients, it was insufficient to return serum ionized calcium to control levels. Changes in serum phosphorus, magnesium, or pH could not account for the observed decrease in serum ionized calcium concentration. It is necessary to monitor serum ionized calcium level in hypoparathyroid patients during furosemide therapy.

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