Conjunctival and nailbed biomicroscopy in atrophic ozenatous rhinopathy

On the basis of the hypothesis that vascular pathology is of etiological importance in ozena, the microcirculation of 127 persons, with and without nasal diseases, was investigated by biomicroscopy of the conjunctiva and the nailbed. Ischemia and the pattern described in acrocyanosis were common features found in primary atrophic rhinitis and ozena. There was good correlation between the severity of the vascular pathology and the degree of nasal atrophy.

On the existence and structure of a new urobilin of molecular weight 592

Images

Electroencephalographic activation: nonspecific habituation by verbal stimuli

A decrease in the duration of the electroencephalographic activation response to a series of different words: emotional, "neutral," and scrambled occurred. The response to "neutral" words was consistently briefer than that to the other words. This result is evidence of a nonspecific habituation of activation, which implies that habituation to classes of stimuli can occur.

Blood cell aggregation and screen filtration pressure

Changes in the microcirculation of the conjunctiva were compared with the screen filtration pressure (SFP) of venous blood in presumed normal subjects and in others with known systemic disease. The presence of arteriolar aggregation and of other circulatory abnormalities was not attended by significantly different mean SFP values. When, however, 2.5 µg of adenosine diphosphate (ADP) per milliliter were added to blood in vitro 20 to 30 seconds before the SFP determination, the SFP increased. In subjects with normal microcirculation, the increase was slight; in those with abnormal circulation, it was marked. When abnormal changes in the circulation were present, or ADP potentiation was high, there was an increase in the spread of control SFP values. Also when the ADP potentiation was high, the control SFP values were slightly higher than when the SFP potentiation was low. Two serotonin antagonists did not prevent or decrease the increase in SFP by ADP.

A simple technique for capillary microscopy

Images