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      Is CK-MB isoenzyme useful for diagnosis of cardiac involvement in icteric leptospirosis? Translated title: CK-MB: útil no diagnóstico de envolvimento cardíaco na leptospirose ictérica

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          Abstract

          In the absence of heart failure or cardiogenic shock, cardiac involvement diagnosis in icteric leptospirosis is possible on the basis of abnormal electrocardiograms. As metabolic and electrolytic disorders are frequently seen during acute leptospirosis infection, they may be responsible for some electrocardiograms changes. We conducted a study to assess if creatine phosphokinase isoenzyme determinations are useful in selecting patients with a high cardiac involvement suspicion. Sixty-nine patients were studied prospectively. Ten patients out of 16 with cardiac involvement and 25 without had high CK-MB levels (p>0.05), although mean values of abnormal CK-MB levels were higher in the group with cardiac involvement (p<0.05). Our analysis indicates that serum CK-MB determination does not provide a specific indicator of myocardial involvement in the course of icteric leptospirosis.

          Translated abstract

          Na ausência de insuficiência cardíaca ou choque cardiogênico, o diagnóstico de envolvimento cardíaco na leptospirose ictérica pode ser baseado em alterações eletrocardiográficas. Devido ao frequente comprometimento multisistêmico da doença, algumas dessas alterações podem ser secundárias a distúrbios metabólicos ou eletrolíticos. Realizou-se um estudo para avaliação do significado da enzima CK-MB elevada em casos suspeitos de envolvimento cardíaco. Sessenta e nove pacientes com leptospirose ictérica foram estudados prospectivamente. Dez dos 16 casos com envolvimento cardíaco e 25 dos 53 pacientes sem envolvimento cardíaco tiveram CK-MB elevada (p>0,05). O valor médio de CK-MB foi maior no grupo com envolvimento cardíaco (p<0,05). Nossa análise indica que a presença de CK-MB elevada no curso de leptospirose ictérica não é indicadora de envolvimento cardíaco.

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          Most cited references14

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          Several Conditions Causing Elevation of Serum CK-MB and CK-BB

          Swei Tsung (1981)
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            Creatine Kinase in Human Tissues

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              Specificity of elevated serum MB creatine phosphokinase activity in the diagnosis of acute myocardial infarction.

              Creatine phosphokinase (CPK) isoenzyme determinations are useful in the diagnosis of myocardial infarction. However, until suitably sensitive and precise quantitative procedures became available, the diagnostic specificity of serum CPK isoenzyme elevations could not be thoroughly examined. In this study an assay procedure capable of accurately determining activity of individual CPK isoenzymes even in serum samples with normal total CPK activity was employed to obtain two types of information. First, CPK isoenzyme profiles were examined in extracts of a spectrum of human tissues obtained at operation to determine whether the isoenzyme associated with myocardium is presented in other human tissues in quantities sufficient to produce increased activity in serum. In addition, CPK isoenzymes were analyzed quantitatively in serial serum samples from 50 hospitalized control subjects, 100 patients with acute myocardial infarction, 100 patients undergoing non-cardiac surgery and 50 patients undergoing cardiac catheterization to determine whether insult to tissues other than the heart is associated with increased "myocardial" CPK isoenzyme activity in serum. Results from analyses of tissue extracts indicated that myocardium is the only tissue surveyed containing sufficient MB CPK to account for substantial increases in serum MB activity. Results from analyses of serial serum samples indicated that MB CPK activity levels are consistently elevated after myocardial infarction, averaging 0.089 IU/ml. However, after cardiac cathetrization or noncardiac surgery peak serum MB activity remains low, averaging only 0.004 IU/ml despite marked elevations in total serum CPK activity. Thus, elevated serum MB CPK activity is a highly specific as well as sensitive criterion of myocardial injury.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rimtsp
                Revista do Instituto de Medicina Tropical de São Paulo
                Rev. Inst. Med. trop. S. Paulo
                Instituto de Medicina Tropical (São Paulo )
                1678-9946
                October 1995
                : 37
                : 5
                : 461-465
                Affiliations
                [1 ] Universidade Federal do Rio de Janeiro Brazil
                [2 ] Universidade Federal do Rio de Janeiro Brazil
                [3 ] Instituto Oswaldo Cruz Brasil
                Article
                S0036-46651995000500013
                10.1590/S0036-46651995000500013
                16499e7a-dec6-4c74-94cb-32b38cb94d81

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0036-4665&lng=en
                Categories
                TROPICAL MEDICINE

                Infectious disease & Microbiology
                CK-MB,Cardiac involvement,Icteric leptospirosis
                Infectious disease & Microbiology
                CK-MB, Cardiac involvement, Icteric leptospirosis

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