Gitte H. Hahn

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AIM To provide knowledge of drug prescription patterns in general and of antibiotics in particular, and number of consultations and diagnoses leading to prescriptions among children aged 0-4 y in the Arctic. METHODS A population-based cohort of children aged 0-4 y, living in Sisimiut, the second largest town in Greenland, was followed from August 1996 to(More)
Impaired cerebral autoregulation (CA) is common and is associated with brain damage in sick neonates. Frequency analysis using spontaneous changes in arterial blood pressure (ABP) and cerebral near-infrared spectroscopy (NIRS) has been used to measure CA in several clinical studies. Coherence of the NIRS and ABP signals (i.e. correlation in the frequency(More)
Coherence between spontaneous fluctuations in arterial blood pressure (ABP) and the cerebral near-infrared spectroscopy signal can detect cerebral autoregulation. Because reliable measurement depends on signals with high signal-to-noise ratio, we hypothesized that coherence is more precisely determined when fluctuations in ABP are large rather than small.(More)
AIM Hypotension is a common problem in newborn infants and is associated with increased mortality and morbidity. Dopamine is the most commonly used antihypotensive drug therapy, but has never been shown to improve neurological outcomes. This study tested our hypothesis that dopamine affects cerebral autoregulation (CA). METHODS Near-infrared spectroscopy(More)
BACKGROUND Despite widespread use in sick infants, it is still debated whether vasopressor-inotropes have direct cerebral effects that might affect neurological outcome. We aimed to test direct cerebrovascular effects of three commonly used vasopressor-inotropes (adrenaline, dopamine and noradrenaline) by comparing the responses to those of(More)
AIM Despite widespread use, effects of volume boluses and dopamine in hypotensive newborn infants remain controversial. We aimed to elucidate if hypovolemia alone impairs cerebral autoregulation (CA) and if dopamine affects cerebral vasculature. METHODS In 12 piglets, cerebral perfusion (laser-Doppler flux) and oxygenation [near-infrared spectroscopy(More)
BACKGROUND Hypotensive neonates who have been treated with dopamine have poorer neurodevelopmental outcome than those who have not been treated with dopamine. We speculate that dopamine stimulates adrenoceptors on cerebral arteries causing cerebral vasoconstriction. This vasoconstriction might lead to a rightward shift of the cerebral autoregulatory curve;(More)
INTRODUCTION Both systemic inflammation and impaired cerebral autoregulation (CA) have been associated with brain injury in preterm infants. We hypothesized that impaired CA represents a hemodynamic link between inflammation and brain injury. RESULTS Neither fetal vasculitis nor interleukin-6 (IL-6) affected CA significantly. A high level of IL-6 was(More)
Increased preterm delivery rate and survival of preterm infants of whom a considerable proportion survive with neurodevelopmental impairment calls for better knowledge of mechanisms associated with brain injury. This thesis focuses on cerebral autoregulation and is based on clinical studies of very preterm infants and experimental studies in newborn(More)