title: Resting heart rate in children with Crimean-Congo hemorrhagic fever: a tool to identify patients at risk?
abstract: OBJECTIVE
  We aimed to assess the association between resting heart rate (RHR) and severe infection in children with Crimean-Congo hemorrhagic fever (CCHF).
  
  
  METHODS
  In all, 121 patients under 18 years of age with a laboratory-confirmed diagnosis of CCHF were enrolled in the study. Patients were classified into two groups based on disease severity (severe group and nonsevere group). RHR was measured by electrocardiography (ECG) on admission. Maximum P-wave duration (Pmax), P-wave dispersion (Pd), QRS duration, corrected QT interval, and QT dispersion were also measured.
  
  
  RESULTS
  Mean age was 11.4±3.9 years and 84 patients were male. Twenty-six patients were classified as severe. Patients in this group had a higher RHR (103.6±10.4 vs. 80.5±8.1, p=0.001) than those with nonsevere disease. There was no difference in Pmax, Pd, QRS duration, QTcmax, or QTc dispersion. The optimal cutoff value of RHR to predict disease severity was>96 beats per minute (bpm), with 70.6% sensitivity and 50.1% specificity. Bleeding, thrombocytopenia (≤80×10(9)/L), elevated aspartate transaminase (AST) (>208 IU/L), elevated alanine transaminase (ALT) (>87 IU/L), elevated lactate dehydrogenase (LDH) (>566 IU/L), long activated partial thromboplastin time (aPTT) (>42 s), and increased hospitalization days were more frequent in patients with RHR >96 bpm. Multivariate logistic regression analysis revealed low platelet count (<80×10(9)/L), long aPTT (>42 s), high LDH (>566 IU/L), and elevated RHR (>96 bpm) as independent risk factors for severe disease.
  
  
  CONCLUSIONS
  We conclude that elevated RHR was significantly associated with severe disease in children with CCHF, thus offering the potential to identify patients with increased risk.
authors.affiliation: 1 Department of Pediatrics, Cumhuriyet University , Faculty of Medicine, Sivas, Turkey .
authors.forename: Mehmet Burhan
authors.initials: MB
authors.lastname: Oflaz
authors.forename: Fatih
authors.initials: F
authors.lastname: Bolat
authors.forename: Ali
authors.initials: A
authors.lastname: Kaya
authors.forename: Ahmet Sami
authors.initials: AS
authors.lastname: Guven
authors.forename: Zekeriya
authors.initials: Z
authors.lastname: Kucukdurmaz
authors.forename: Hekim
authors.initials: H
authors.lastname: Karapinar
authors.forename: Osman
authors.initials: O
authors.lastname: Gulsever
authors.forename: Melih
authors.initials: M
authors.lastname: Dogan
authors.forename: Omer
authors.initials: O
authors.lastname: Cevit
authors.forename: Fusun Dilara
authors.initials: FD
authors.lastname: Icagasioglu
mesh_terms: D000293:Adolescent; D002648:Child; D003710:Demography; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D003225:Hemorrhagic Fever Virus, Crimean-Congo / Q000502:physiology*; D006479:Hemorrhagic Fever, Crimean / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology*; D006801:Humans; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D011446:Prospective Studies; D012372:ROC Curve; D012307:Risk Factors; D012720:Severity of Illness Index; D014421:Turkey / Q000453:epidemiology