Non-invasive blood pressure measurement in the domestic chicken by the use of the Doppler principle

Non-invasive blood pressure measurement by the use of a technique using the Doppler principle allows estimation of systolic blood pressure and heart rate in the conscious bird without trauma. It permits repeated measurements over a long period with minimal stress to the bird. Blood pressure was measured in hypo-, normo-, and hypertensive birds. Measurement using the Doppler principle technique was compared with invasive catheter measurement simultaneously in the same bird

Brain changes in Hypothermia: Surface-versus Core-cooling in pigs

The process of hypothermia in the clinical setting has been practiced for 50 years and is known for its neuroprotective properties. This paper describes histopathological changes either by an ice sludge mimicking accidental hypothermia (S-group n=7) or by endovascular core-cooling (C-group n=7). Focal infiltrates of neutrophilic granulocytes were found in five of seven brains in the S-group and in one of seven brains in the C-group. These granulocytes were found in the arachnoids, in vessels, in vessel walls, and in the cerebral cortex. Fungi, bacteria, lymphocytes or plasma were not found. This experimental study, mimicking accidental hypothermia, reported histopathologic features of aseptic inflammation. To our knowledge, such findings have not been described in hypothermic animals or humans before. We suggest that a local inflammatory response may be triggered in such cases of hypothermia

Solid Air

An exhibition together with Marianne Morild and Lars Korff Lofthus at Transition Gallery, London, December 201

Mercury in human brain, blood, muscle and toenails in relation to exposure: an autopsy study

Background: The main forms of mercury (Hg) exposure in the general population are methylmercury (MeHg) from seafood, inorganic mercury (I-Hg) from food, and mercury vapor (Hg0) from dental amalgam restorations. While the distribution of MeHg in the body is described by a one compartment model, the distribution of I-Hg after exposure to elemental mercury is more complex, and there is no biomarker for I-Hg in the brain. The aim of this study was to elucidate the relationships between on the one hand MeHg and I-Hg in human brain and other tissues, including blood, and on the other Hg exposure via dental amalgam in a fish-eating population. In addition, the use of blood and toenails as biological indicator media for inorganic and organic mercury (MeHg) in the tissues was evaluated. Methods: Samples of blood, brain (occipital lobe cortex), pituitary, thyroid, abdominal muscle and toenails were collected at autopsy of 30 deceased individuals, age from 47 to 91 years of age. Concentrations of total-Hg and I-Hg in blood and brain cortex were determined by cold vapor atomic fluorescence spectrometry and total-Hg in other tissues by sector field inductively coupled plasma-mass spectrometry (ICP-SFMS). Results: The median concentrations of MeHg (total-Hg minus I-Hg) and I-Hg in blood were 2.2 and 1.0 μg/L, and in occipital lobe cortex 4 and 5 μg/kg, respectively. There was a significant correlation between MeHg in blood and occipital cortex. Also, total-Hg in toenails correlated with MeHg in both blood and occipital lobe. I-Hg in both blood and occipital cortex, as well as total-Hg in pituitary and thyroid were strongly associated with the number of dental amalgam surfaces at the time of death. Conclusion: In a fish-eating population, intake of MeHg via the diet has a marked impact on the MeHg concentration in the brain, while exposure to dental amalgam restorations increases the I-Hg concentrations in the brain. Discrimination between mercury species is necessary to evaluate the impact on Hg in the brain of various sources of exposure, in particular, dental amalgam exposure

Unrecognized myocardial infarction in the elderly

This study presents the frequency of old myocardial infarctions (OMI), and the frequency of unrecognized myocardial infarction (UMI) in elderly people in a forensic material. It was also examined if predisposing factors of UMI could be identified. Of special interest was also to investigate the value of the police’s records as a source for medical information in a forensic setting. The study is based upon medico-legal autopsies of persons above the age of 60 at the time of death during the period 1999-2003. The study included 325 cardiovascular deaths. Of these, 166 died from OMI. UMI accounted for 123 of these (74%). Most UMI were located in the interventricular myocardial septum and left anterior wall (>60%), but no significant differences could be found between UMI and recognized MIs (RMI). No obvious reason could be found as to why the UMI remained unrecognized. Police records were inferior to the hospitals records, regarding medical information to the pathologist, with information about cardiac disease in about 60%, and with information about OMI in 11-17%. Hospital records supplying information about OMI were found in half the cases. It is concluded that unrecognized myocardial infarction is not uncommon among elderly persons, and with a high risk of sudden death. More emphasis should be put in recognizing OMI in ECGs to attempt to reduce the risk of sudden cardiac death