The common procedure of invasive cardiac intervention and intravenous magnesium administration before reperfusion should without question become the gold standard in treatment of acute myocardial infarction.  Two meta-analyses studied the impact of magnesium treatment on reduction of the death rate and rhythm disorders in the acute phase of myocardial infarction before initiation of reperfusion treatments. Both reports found a 54% reduction of the death rate, and one noted a decreased incidence (49% less) of ventricular fibrillation or tachycardia in the population treated by magnesium.  The most important action of MgSO4 in AMI is to open up collateral circulation and relieve ischaemia thus reducing infarct size and mortality rates. 
Haloperidol is a typical butyrophenone type antipsychotic that exhibits high affinity dopamine D 2 receptor antagonism and slow receptor dissociation kinetics.  It has effects similar to the phenothiazines .  The drug binds preferentially to D 2 and α 1 receptors at low dose (ED 50 = and mg/kg, respectively), and 5-HT 2 receptors at a higher dose (ED 50 = mg/kg). Given that antagonism of D 2 receptors is more beneficial on the positive symptoms of schizophrenia and antagonism of 5-HT 2 receptors on the negative symptoms, this characteristic underlies haloperidol's greater effect on delusions, hallucinations and other manifestations of psychosis.  Haloperidol's negligible affinity for histamine H 1 receptors and muscarinic M 1 acetylcholine receptors yields an antipsychotic with a lower incidence of sedation, weight gain, and orthostatic hypotension though having higher rates of treatment emergent extrapyramidal symptoms .
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