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21 June 2011

Electrocardiographic changes in hospitalized patients with leptospirosis over a 10-year period

Vedrana SkerkABCDEF, Alemka MarkoticABDEF, Ivan PuljizD, Ilija KuzmanB, Elvira Celjuska TosevB, Josipa HabusB, Nenad TurkB, Josip BegovacCD

DOI: 10.12659/MSM.881847

Med Sci Monit 2011; 17(7): CR369-375

Abstract

Background: The aim of this study was to investigate the incidence and type of ECG changes in patients with leptospirosis regardless of clinical evidence of cardiac involvement.
Material/Methods: A total of 97 patients with serologically confirmed leptospirosis treated at the University Hospital for Infectious Diseases „Dr. Fran Mihaljević“ in Zagreb, Croatia, were included in this retrospective study. A 12-lead resting ECG was routinely performed in the first 2 days after hospital admission. Thorough past and current medical history was obtained, and careful physical examination and laboratory tests were performed.
Results: Abnormal ECG findings were found in 56 of 97 (58%) patients. Patients with abnormal ECG had significantly elevated values of bilirubin and alanine aminotransferase, lower values of potassium and lower number of platelets, as well as more frequently recorded abnormal chest x-ray. Non-specific ventricular repolarization disturbances were the most common abnormal ECG finding. Other recorded ECG abnormalities were sinus tachycardia, right branch conduction disturbances, low voltage of the QRS complex in standard limb leads, supraventricular and ventricular extrasystoles, intraventricular conduction disturbances, atrioventricular block first-degree and atrial fibrillation. Myopericarditis was identified in 4 patients. Regardless of ECG changes, the most commonly detected infection was with Leptospira interrogans serovar Australis, Leptospira interrogans serovar Saxkoebing and Leptospira kirschneri serovar Grippotyphosa.
Conclusions: The ECG abnormalities are common at the beginning of disease and are possibly caused by the direct effect of leptospires or are the non-specific result of a febrile infection and metabolic and electrolyte abnormalities. New studies are required for better understanding of the mechanism of ECG alterations in leptospirosis.

Keywords: Leptospirosis - physiopathology, Electrocardiography, Croatia, Cardiac Complexes, Premature - pathology, Bilirubin - blood, Atrioventricular Block - pathology, Atrial Fibrillation - pathology, Alanine Transaminase - blood, Tachycardia, Sinus - pathology

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750