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Query: UMLS:C0020538 (hypertension)
 170,190 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Formal assessment of the risk of pre-eclampsia should be made early in pregnancy and antenatal care planned accordingly. Recommendations will emerge by the end of this year in a consensus statement (PRECOG guidelines) prepared by clinicians and the lay organisation Action on Pre-eclampsia (APEC) www.apec.org.uk. Some hospitals complement clinical risk assessment with Doppler screening of uterine artery waveforms in mid-pregnancy. Severe pre-eclampsia often takes an explosive course, evolving over a period of hours. Recognition may, therefore, not be amenable to intermittent blood pressure recording and urine testing, but requires women reporting relevant symptoms and GPs being sensitive to the possible significance of complaints such as vomiting and epigastric pain. Severe hypertension demands urgent antihypertensive treatment in hospital. Magnesium sulphate now has an accepted role in the prevention of eclampsia. Possible prevention of pre-eclampsia by antioxidant therapy is the subject of a clinical trial. Low-dose aspirin has a modest but beneficial effect in high-risk women. Delivery remains the definitive treatment for pre-eclampsia, but there may be initial deterioration after birth, especially in the HELLP syndrome.
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PMID:Hypertension in pregnancy. 1549 Oct 15

The administration of magnesium sulphate is a proposed novel therapy for Irukandji syndrome'. In this non-randomized, unblinded case series, data from ten patients who received magnesium salts are reviewed. Magnesium sulphate boluses of 10 to 20 mmol, in the six patients for which there was adequate data, reduced pain scores immediately after administration from 8.7+/-1.5 to 2.8+/-2.8 (Wilcoxon rank-sum test, P=0.03). In ten patients blood pressure decreased with a mean difference of -18 mmHg in mean arterial pressure. Magnesium requirements in individual patients varied markedly. Pain on injection occurred in four patients, three of whom had received peripherally administered magnesium chloride, and one patient reported transient ptosis after administration of magnesium sulphate 166 mmol over 18 hours in the setting of severe Irukandji syndrome. Magnesium sulphate administration appears to attenuate pain and hypertension in Irukandji syndrome and warrants further evaluation in this setting.
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PMID:Early experience with magnesium administration in Irukandji syndrome. 1611 7

Hypertensive diseases in pregnancy are common and are associated with significant maternal and perinatal mortality and morbidity. Risk factors for pre-eclampsia include socio-demographical factors (extremes of reproductive age, socio-economic status, ethnic group), genetic factors, pregnancy factors (multiple pregnancies, primigravidae, previous pre-eclampsia) or personal medical history (obesity, chronic renal disease, chronic hypertension, diabetes mellitus, thrombophilia). These risk factors and Doppler screening can help target interventions such as aspirin and calcium that have been proven to reduce the incidence of pre-eclampsia in high risk women. Expectant management is the mainstay of treatment for pre-eclampsia. Hypertension should be controlled by oral or intravenous antihypertensive agents as necessary. Magnesium sulphate is the agent of choice for both the treatment and prevention of eclampsia. Fluid balance and thromboprophylaxis are also both important elements in the management of severe pre-eclampsia.
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PMID:Risk factors, prevention and treatment of hypertension in pregnancy. 1617 Feb 83

The hypertensive disorders of pregnancy remain a leading cause of maternal and perinatal morbidity and mortality in Europe and North America. Pre-eclampsia, which is proteinuric gestational hypertension, accounts for the majority of the excess risks and is defined by the maternal syndrome. The maternal syndrome of pre-eclampsia is characterised by a systemic inflammatory response and its sequelae. Systematic multisystem evaluation of pre-eclampsia, evidence-based antihypertensive therapy, and the use of MgSO4 to prevent and treat the seizures of eclampsia can reduce maternal risks. For mild-to-moderate pregnancy hypertension, maternal risks are small, and there may be adverse perinatal consequences of blood pressure normalisation. Early-onset and severe pre-eclampsia predict an excess risk of later cardiovascular morbidity and mortality. Both Chlamydophila pneumoniae and cytomegalovirus have bee associated with pre-eclampsia and atherosclerosis, and may provide a mechanistic link between pre-eclampsia and the recognised cardiovascular risk. Women with a history of either early-onset and/or severe pre-eclampsia should be considered to be at increased risk for later cardiovascular disease, and it may be prudent for them to have regular lipid profiles and tests for urinary microalbumin excretion.
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PMID:The complications of hypertension in pregnancy. 1617 95

This review reflects both the variable presentation and the systemic nature of preeclampsia. Recommendations for the comprehensive evaluation and management of organ dysfunction associated with pre-eclampsia are included. The main points in the review are that: (1) Preeclampsia is a systemic disorder that may affect many organ systems. (2) For preeclampsia remote from term (<34 weeks), expectant management improves perinatal outcomes, but requires obsessive surveillance to mitigate maternal risks and is a "package." (3) Initial assessment and ongoing surveillance of women with preeclampsia should include assessment of all vulnerable maternal organs as well as of the fetus. (4) Initiate antihypertensive drug treatment immediately if sBP >160 mmHg or dBP more than 110 mmHg, or if sBP 140-159 mmHg and/or dBP 85-109 mmHg (prepregnancy renal disease or diabetes). (5) The treatment of nonsevere pregnancy hypertension should include a treatment goal of dBP 80-105 mmHg (depending on practitioner preference), with one of the following agents, Methyldopa, Labetalol, Nifedipine, or, with special indications (renal or cardiac diseases), diuretics. (6) Drugs to avoid: angiotensin-converting enzyme inhibitors; angiotensin II receptor antagonists; and atenolol. (7) For the acute management of severe hypertension, initially reduce dBP by 10 mmHg and maintain the blood pressure at or below that level with either Nifedipine or Labetalol. (8) For both prophylaxis against and treatment of eclampsia, MgSO4 (4 g IV stat, then 1 g/hr). (9) For recurrent seizures, MgSO4 (2g IV stat, then increase to 1.5 g/hr). (10) Total fluid intake should not exceed 80 ml/hr; tolerate urine outputs as low as 10 ml/hr. (11) Early-onset and/or severe preeclampsia predict later cardiovascular morbidity and mortality; it would seem prudent to offer such women screening and lipid lowering interventions.
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PMID:Evidence-based management for preeclampsia. 1748 66

Eclampsia is associated with increased blood-brain barrier (BBB) permeability and formation of cerebral oedema. Magnesium sulphate is used to treat eclampsia despite an unclear mechanism of action. This study was to determine the effect of magnesium sulphate on in vivo BBB permeability and formation of cerebral oedema during acute hypertension and on brain aquaporin-4 (AQP4) protein expression. An in vivo model of hypertensive encephalopathy was used in late-pregnant (LP) rats following magnesium sulphate treatment, 270 mg kg(-1) i.p. injection every 4 h for 24 h. Permeability of the BBB was determined by in situ brain perfusion of Evan's Blue (EB) and sodium fluorescein (NaFl), and dye clearance determined by fluorescence spectrophotometry. Cerebral oedema was determined following acute hypertension by measuring brain water content. The effect of magnesium treatment on AQP4 expression was determined by Western blot analysis. Acute hypertension with autoregulatory breakthrough increased BBB permeability to EB in both brain regions studied (P < 0.05). Magnesium attenuated BBB permeability to EB during acute hypertension by 41% in the posterior cerebrum (P < 0.05) but had no effect in the anterior cerebrum (P > 0.05). Treatment with magnesium did not change NaFl permeability, cerebral oedema formation or AQP4 expression. In summary, BBB permeability to Evan's Blue was increased by acute hypertension in LP rats, and this was attenuated by treatment with magnesium sulphate. The greatest effect on BBB permeability to EB was in the posterior cerebrum, an area particularly susceptible to oedema formation during eclampsia.
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PMID:Magnesium sulphate treatment decreases blood-brain barrier permeability during acute hypertension in pregnant rats. 1793 63

Treating patients with aneurysmal subarachnoid haemorrhage is taking care of acutely ill patients, and should be performed in centres where a multidisciplinary team is available 24 hours a day 7 days a week, and where enough patients are managed to maintain and improve standards of care. There is no medical management that improves outcome by reducing the risk of rebleeding, therefore occlusion of the aneurysm, nowadays preferably by means of coiling, remains an important goal in treating patients with aneurysms. Because the poor outcome after subarachnoid haemorrhage is caused to a large extent by complications other than rebleeding, proper medical management to prevent and treat these complications is therefore essential. On basis of the available evidence, oral (not intravenous) nimodipine should be standard care in patients with subarachnoid haemorrhage. It is rational to refrain from treating hypertension unless cardiac failure develops and to aim for normovolaemia, even in case of hyponatraemia. There is no evidence for prophylactic hypervolaemia, and the strategy of hypervolaemia and hypertension in patients with secondary cerebral ischaemia is based on case reports and uncontrolled observational series of patients. Magnesium sulphate and statins are promising therapies, and large trials on effectiveness in improving clinical outcome are underway. There is no evidence for prophylactic use of anti epileptic drugs, and routine use of corticosteroids should be avoided.
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PMID:Medical management of patients with aneurysmal subarachnoid haemorrhage. 1870 99

A retrospective study of 68 eclamptic women who received Magnesium sulphate at Koshi Zonal Hospital were analyzed during a one year period (2006-2007 AD). Maternal conditions at admission, associated complications in mothers and babies, delivery outcomes and cause of death were also studied in each case. There were 5240 deliveries during the period of analysis. Of which 4976 were live births, pregnancy induced hypertension was 0.89% (47), 0.74% (39) presented with pre-eclampsia, 0.30 (16) cases with severe pre-eclampsia and 0.43 (23) cases with mild pre-eclampsia. During this period 1.3% (68) of eclampsia presented to the hospital. Of which 67.7% presented with ante-partum eclampsia, 22.1% with intrapartum eclampsia and 10.3% with post partum eclampsia. Majority of women (63.2%) were between 20-25 years of age, while teenage pregnancy contributed 30.88% of eclamptic cases. The diastolic blood pressure was >110 mm of Hg in 45.6% of cases, 90-110 mmHg in 50% of cases and in 4.4% the it was <90 mmHg. 94.1% presented to the hospital in an unconscious state, 79.4% of eclamptic women received the full dose of magnesium sulphate (initial loading plus maintenance dose), while rest failed to receive the full dose. Nine women with severe pre-eclampsia received magnesium sulphate as a prophylactic measure. 17.7% women had home delivery, one patient left against medical advice and one was referred to a tertiary care center. Caesarian Section (Lower Segment) was performed in 35.2% of cases, 30.8% had normal vaginal deliveries and 5.8% had pre term delivery. About 69.6% babies were born alive, 8.7% were still births, 11.6% were neonatal deaths and 4.4% of babies had to be admitted to the neonatal intensive care. Eclamptic women stayed less than one week in the hospital in majority of cases (64.7%), between 1-2 weeks in 32.4% and more than two weeks in 2.9%. Maternal complications included decreased urinary output, pulmonary edema in three cases; chest and wound infection two cases each; post partum psychosis, vulval haematoma, severe headache one case each. There were seven maternal deaths during this period and eclampsia contributed to one of the deaths. Eclampsia is a major cause of maternal and perinatal morbidity and mortality in our setup. Magnesium sulphate is an excellent drug of choice in management of eclampsia and pre-eclampsia. Wider coverage of pre-natal care, timely referral and optimal management of cases of eclampsia with magnesium sulphate in hospitals are key issues to prevent mortality/morbidity associated with it.
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PMID:Magnesium sulphate: a life saving drug. 1907 72

Phaeochromocytoma is a rare catecholamine producing tumour, feared for its life threatening cardiovascular disturbances during anaesthesia. Improved medical and anesthetic management resulted in reduction of perioperative phaeochromocytoma resection mortality from about 50% in the pioneer period to near 0% nowadays. Cardiomyopathy is usually reversible if managed properly. Stress related or (inverted) Tako Tsubo cardiomyopathy is a recent finding, deserving our attention. Preoperative alpha blockade should be performed to achieve cardiovascular stability and decrease uncontrolled intraoperative surges in blood pressure. During anaesthesia, additional antihypertensive (also mainly alpha blocking) agents are essential to prevent and overcome hypertensive crises. Magnesium sulphate is a safe and promising agent in improving cardiovascular stability and should have a place in standard therapy. A careful selection of anaesthetic drugs and techniques that cause the least hypertension is most important. Preoperative and intraoperative beta-blockade can only be used as adjuvant therapy, mainly to control tachycardia and other rhythm disturbances. Postoperatively, the patient is transferred to the intensive care unit where adequate management of haemodynamic and metabolic complications takes place.
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PMID:Perioperative management of phaeochromocytoma. 1945 56

A disturbed balance between angiogenic and antiangiogenic growth factors is a highly accepted mechanism in the pathogenesis of pregnancy-induced hypertension and proteinuria, which is clinically known as preeclampsia (PE). We investigated the effect of magnesium sulfate (MgSO4) therapy on vascular endothelial growth factor (VEGF), placental growth factor (PlGF), nitric oxide (NO) metabolites, soluble fm-like tyrosine kinase-1 (sFlt-1) and endoglin levels in PE rats and the effect of this treatment on the feto-maternal outcome. The PE group showed hypertension, proteinuria and decreased number and weight of live pups relative to the control group. This result was associated with increased sFlt-1, VEGF receptor-2 (VEGFR-2), VEGFR-3 and endoglin levels but decreased NO metabolites. MgSO4 therapy ameliorated systolic hypertension and proteinuria and decreased sFlt-1, VEGFR-2, VEGFR-3 and endoglin levels but increased NO metabolites in the treated group. Physiological and biochemical changes and improved pup weight and viability were observed in the treated group. The vasodilator action of MgSO4 and increased NO production are expected to increase placental blood flow and help fetal nutrition and development. Relief of placental ischemia decreases the production of antiangiogenic growth factors and restores the bioavailability of angiogenic factors (PlGF and VEGF). These changes resulted in better fetal outcome and an improved clinical picture of PE. These findings are promising and encourage further study of the mechanism of action of MgSO(4) to support its widespread use in the prevention and management of the etiopathological changes underlying the vast majority of the manifestations and complications of PE.
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PMID:Magnesium sulfate therapy of preeclampsia: an old tool with new mechanism of action and prospect in management and prophylaxis. 2276 74


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