Biomedical subjects

Ann K Helms

Publications and source records attributed to Ann K Helms.

3 recordsLinked to original sources

PubMed2005

Hyperbaric oxygen therapy of cerebral ischemia.

BACKGROUND: Hyperbaric oxygen (HBO) therapy of cerebral ischemia has been evaluated in a number of human and animal studies; however, there is presently no consensus on its efficacy. METHODS: We present a review of animal and human studies on HBO therapy of cerebral ischemia as well as present potential mechanisms of action of HBO. RESULTS: Animal studies of HBO have shown promise by reducing infarct size and improving neurologic outcome. HBO has also been shown to inhibit inflammation and apoptosis after cerebral ischemia. Early reports in humans also suggested benefit in stroke patients treated with HBO. Recent randomized, controlled human studies, however, have not shown benefit, although all were limited by small sample size. Important differences between animal and human studies suggest HBO might be more effective in stroke within the first few hours and at a pressure of 2-3 ATA. CONCLUSIONS: The clinical usefulness of HBO in the treatment of cerebral ischemia is not yet certain. Attention to emerging pathophysiologic data should be taken into consideration in design of any future clinical trials of HBO in acute ischemic stroke.

Animals↗

PubMed2005

Determinants of mortality in stroke patients with right brain damage.

Stroke is the world's second leading cause of mortality and long-term disability. Damage to the nondominant right brain has distinct clinical characteristics. The resultant cardiovascular and autonomic dysfunction peculiar to right hemispheric stroke can adversely affect the short- and long-term outcome of stroke victims. Blood flow characteristics to the right hemisphere may also put the right brain at more risk for embolic and silent infarcts.

Autonomic Nervous System↗

PubMed2005

Pregnancy and stroke.

The risks of ischemic stroke, intracerebral hemorrhage, and subarachnoid hemorrhage are not increased in the 9 months of gestation except for a high risk in the 2 days prior and 1 day postpartum. The remaining 6 weeks postpartum also have an increased risk of ischemic stroke and intracerebral hemorrhage, though less than the peripartum period. Although there are some rare causes of stroke specific to pregnancy and the postpartum period, eclampsia, cardiomyopathy, postpartum cerebral venous thrombosis, and, possibly, paradoxical embolism warrant special consideration. The diagnostic and therapeutic approaches to stroke during pregnancy and the postpartum period are similar to the approaches in the nonpregnant woman with some minor modifications based on consideration of the welfare of the fetus. There is a theoretical risk of magnetic resonance imaging exposure during the first and second trimester but the benefit to the mother of obtaining the information may outweigh the risk. Available evidence suggests that low-dose aspirin (<150 mg/day) during the second and third trimesters is safe for both mother and fetus. Postpartum use of low-dose aspirin by breast-feeding mother is also safe for infant. While proper counseling is imperative, a history of pregnancy-related stroke should not be a contraindication for subsequent pregnancy.

Female↗