Magnesium, Mg2+, is the second most abundant intracellular cation after potassium and the fourth most abundant in the body. It was first isolated in 1808 by the English chemist, Sir Humphrey Davy. Magnesium is essenti...Magnesium, Mg2+, is the second most abundant intracellular cation after potassium and the fourth most abundant in the body. It was first isolated in 1808 by the English chemist, Sir Humphrey Davy. Magnesium is essential to numerous biochemical reactions. It modulates key physiological processes such as metabolic biochemistry, nucleic acid synthesis, receptor-binding and ion flux. The western diet falls short of the recommended daily allowance of 4.5 mg/Kg/day and important dietary sources are seeds, grains, nuts and green vegetables. It is used as a therapeutic agent in a broad range of pathologies: neurological, cardiovascular, respiratory, gastrointestinal and obstetric. The pharmacokinetics and pharmacodynamics of magnesium, as a drug, are not well understood. Despite its fundamental importance to human physiology, it remains an electrolyte that is not routinely measured as part of the “urea & electrolytes” test and is the most overlooked electrolyte deficiency in hospital inpatients. This review will summarise the importance of magnesium homeostasis, its pharmacological effects and clinical applications.展开更多
Consensus regarding optimal burns intensive care(BICU)patient management is lacking.This study aimed to assess whether ventilation strategies,cardiovascular support and sedation in BICU patients have changed over time...Consensus regarding optimal burns intensive care(BICU)patient management is lacking.This study aimed to assess whether ventilation strategies,cardiovascular support and sedation in BICU patients have changed over time,and whether this affects outcome.A retrospective observational study comparing two 12-patient BICU cohorts(2005/06 and 2010/11)was undertaken.Demographic and admission characteristics,ventilation parameters,sedation,fluid resuscitation,cardiovascular support and outcome(length of stay,mortality)data were collected from patient notes.Data was analysed using T-tests,Fisher’s exact and Mann-Whitney U tests.In our study cohort groups were equivalent in demographic and admission parameters.There were equal ventilator-free days in the two cohorts 10±12.7 vs.13.3±12.2 ventilator free days;(P=0.447).The 2005/06 cohort were mechanically ventilated more often than in 2010/11 cohort(568 ventilator days/1000 patient BICU days vs.206 ventilator days/1000 patient BICU days;P=0.001).The 2005/06 cohort were ventilated less commonly in tracheostomy group/endotracheal tube spontaneous(17.8%vs.26%;P=0.001)and volumecontrolled modes(34.4%vs.40.8%;P=0.001).Patients in 2010/11 cohort were more heavily sedated(P=0.001)with more long-acting sedative drug use(P=0.001)than the 2005/06 cohort,fluid administration was equivalent.Patient outcome did not vary.Inhalational injury patients were ventilated in volume-controlled(44.5%vs.28.1%;P=0.001)and pressure-controlled modes(18.2%vs.9.5%;P=0.001)more frequently than those without.Outcome did not vary.This study showed there has been shift away from mechanical ventilation,with increased use of tracheostomy/tracheal tube airway spontaneous ventilation.Inhalation injury patients require more ventilatory support though patient outcomes do not differ.Prospective trials are required to establish which strategies confer benefit.展开更多
文摘Magnesium, Mg2+, is the second most abundant intracellular cation after potassium and the fourth most abundant in the body. It was first isolated in 1808 by the English chemist, Sir Humphrey Davy. Magnesium is essential to numerous biochemical reactions. It modulates key physiological processes such as metabolic biochemistry, nucleic acid synthesis, receptor-binding and ion flux. The western diet falls short of the recommended daily allowance of 4.5 mg/Kg/day and important dietary sources are seeds, grains, nuts and green vegetables. It is used as a therapeutic agent in a broad range of pathologies: neurological, cardiovascular, respiratory, gastrointestinal and obstetric. The pharmacokinetics and pharmacodynamics of magnesium, as a drug, are not well understood. Despite its fundamental importance to human physiology, it remains an electrolyte that is not routinely measured as part of the “urea & electrolytes” test and is the most overlooked electrolyte deficiency in hospital inpatients. This review will summarise the importance of magnesium homeostasis, its pharmacological effects and clinical applications.
文摘Consensus regarding optimal burns intensive care(BICU)patient management is lacking.This study aimed to assess whether ventilation strategies,cardiovascular support and sedation in BICU patients have changed over time,and whether this affects outcome.A retrospective observational study comparing two 12-patient BICU cohorts(2005/06 and 2010/11)was undertaken.Demographic and admission characteristics,ventilation parameters,sedation,fluid resuscitation,cardiovascular support and outcome(length of stay,mortality)data were collected from patient notes.Data was analysed using T-tests,Fisher’s exact and Mann-Whitney U tests.In our study cohort groups were equivalent in demographic and admission parameters.There were equal ventilator-free days in the two cohorts 10±12.7 vs.13.3±12.2 ventilator free days;(P=0.447).The 2005/06 cohort were mechanically ventilated more often than in 2010/11 cohort(568 ventilator days/1000 patient BICU days vs.206 ventilator days/1000 patient BICU days;P=0.001).The 2005/06 cohort were ventilated less commonly in tracheostomy group/endotracheal tube spontaneous(17.8%vs.26%;P=0.001)and volumecontrolled modes(34.4%vs.40.8%;P=0.001).Patients in 2010/11 cohort were more heavily sedated(P=0.001)with more long-acting sedative drug use(P=0.001)than the 2005/06 cohort,fluid administration was equivalent.Patient outcome did not vary.Inhalational injury patients were ventilated in volume-controlled(44.5%vs.28.1%;P=0.001)and pressure-controlled modes(18.2%vs.9.5%;P=0.001)more frequently than those without.Outcome did not vary.This study showed there has been shift away from mechanical ventilation,with increased use of tracheostomy/tracheal tube airway spontaneous ventilation.Inhalation injury patients require more ventilatory support though patient outcomes do not differ.Prospective trials are required to establish which strategies confer benefit.
