Abstract:
:Patients (n = 314) with acute myocardial infarction (AMI) were divided into three groups according to the time elapsed from onset of chest pain to when the first sample for determination of magnesium (s-Mg1) and potassium (s-K1) was drawn (A: hours 0-6; B: hours 6-10, and C: hours 10-24). Potassium and Mg were also measured in a second sample drawn three to twelve days (mean 6.3 days) later (s-Mg2, s-K2). Whereas s-Mg1 was lower than s-Mg2 in all three groups, s-K1 was reduced only in group A. Ten patients in group A receiving nonselective beta-blockers had an attenuated drop in s-Mg1, whereas the drop in s-K1 was completely inhibited. The differences between s-Mg2 and s-Mg1 (delta s-Mg) in all groups, and between s-K2 and s-K1 (delta s-K) in group A, increased with increasing mean peak creatine kinase (CKmax) levels to approximately 1300-1800 U/L. In conclusion, these observations suggest that the initial drop in s-Mg and s-K in the early phase of AMI is due to increased stimulation of beta 2-adrenergic receptors; these changes can be prevented partly or completely by the use of nonselective beta-blockers.
journal_name
Angiologyjournal_title
Angiologyauthors
Landmark K,Urdal Pdoi
10.1177/000331979304400502subject
Has Abstractpub_date
1993-05-01 00:00:00pages
347-52issue
5eissn
0003-3197issn
1940-1574journal_volume
44pub_type
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