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Biomedical subjects

L Vanggaard

Publications and source records attributed to L Vanggaard.

11 recordsLinked to original sources
PubMed1979

"Paradoxical undressing" in fatal hypothermia.

The phenomenon called paradoxical undressing has been described from 33 cases of hypothermia collected from Swedish police reports. The cases were almost evenly distributed with regard to sex, age, and geographical distribution. The cases occurred more frequently in open land although cases from town areas were also found. Most incidents were recorded from November to February at low ambient temperatures, although cases were also reported at temperatures above 0 degree C. Arteriosclerosis and chronic alcoholism were important concomitant illnesses, the latter being frequent in middle-aged men. Epilepsy, diabetes, and pregnancy were present in single cases. Ethanol and other drugs were present in 67% of the males and in 78% of the females, ethanol predominating in men and various psychotropic agents in women. The mean blood ethanol concentration in males was 0.16% and in females, 0.18%. Most frequent findings at necropsy were purple spots or discoloration on the extremities, pulmonary edema, and gastric hemorrhages. It is concluded that paradoxical undressing might be explained by changes in peripheral vasoconstriction in the deeply hypothermic person. It represents the last effort of the victim and is followed almost immediately by unconsciousness and death.

Adolescent↗
PubMed1977

Thermal problems in plethysmography and pressure/volume recording.

Where volume changes are recorded as the concomitant changes in pressure, modern, fast-responding pressure transducers might record not only the pressure changes due to volume changes in the measured object but also the heat of compression, showing itself as an overshoot or hysteresis phenomenon in the calibration curves. Introduction of an effective heat sink (e.g. copper mesh) within the air space in the plethysmograph might absorb this heat and thereby diminish the overshoot phenomena. The effect is not of practical importance in classical venous occlusion plethysmography where rapid changes only contribute to a smaller part of the total volume change during venous occlusion. When rapid changes, as in volume pulse recordings, are to be evaluated, the effect must be taken into consideration and should be reduced.

Blood Pressure Determination↗
PubMed1975

Physiological reactions to wet-cold.

Changes in extremity temperatures during general cold stress were investigated. The changes in local temperatures were found equal to those seen under circulatory arrest. In order to investigate the influence of these changes on motor function, the relation between local temperature and nervous conduction velocity in a peripheral motor nerve (n. ulnaris) was carried out in subjects exposed to a minor cold stress (to aboid the influence of Lewis hunting reaction). The decrease in conduction velocity was found to be 15 m/s per 10 degrees C fall in temperature. At a local temperature of 8-10 degrees C a complete nervous block was established. This leads to an explanation of the clinical findings in wet-cold situations, where the very rapid onset of physical impairment corresponds to the effect of a local cooling in the extremities and not, as commonly accepted, to a developing general hypothermia.

Adaptation, Physiological↗
PubMed1974

Frostbite.

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Adult↗