Magnesium Sulfate 50% is commonly used to treat which condition?

Magnesium Sulfate 50% is primarily used to manage severe asthma attacks and eclampsia, making this the correct choice. In the context of severe asthma, Magnesium Sulfate acts as a bronchodilator by relaxing the smooth muscles in the airways, which helps to alleviate bronchospasm and improve airflow. This is especially beneficial during acute asthma exacerbations when traditional treatments may be insufficient.

Regarding eclampsia, which involves seizures in a pregnant woman with preeclampsia, Magnesium Sulfate serves as an anticonvulsant. It stabilizes neuronal membranes and reduces the likelihood of seizures, providing a critical intervention in managing this potentially life-threatening condition.

The other conditions listed are not typically treated with Magnesium Sulfate. High blood pressure may require antihypertensives, moderate pain usually necessitates analgesics, and irregular heartbeats might be treated with antiarrhythmics. Thus, the specific and effective application of Magnesium Sulfate in severe asthma and eclampsia confirms its relevance and importance in those contexts.