title: Isotretinoin does not prolong QT intervals and QT dispersion in patients with severe acne: a surprising finding for a drug with numerous side effects.
abstract: BACKGROUND
  Isotretinoin is a widely prescribed drug for the treatment of severe acne. Several adverse cardiac effects due to isotretinoin have been previously reported. However, no data exist on the effects of isotretinoin therapy on QT intervals.
  
  
  OBJECTIVE
  To investigate the effects of isotretinoin therapy on QT intervals and QT dispersion, and also to see if it is related to serum lipids, homocysteine and lipoprotein (a) or not.
  
  
  METHODS
  Forty-five patients with severe acne (mean age 21±6 years, range 14-38 years; 26 female) were included in the study. Twelve-lead surface electrocardiograms (ECGs) were acquired at three stages: before therapy and at the ends of the first and sixth months of 0.8 mg/kg/day of isotretinoin therapy. Serum levels of triglycerides, total cholesterol, low density lipoprotein cholesterol, high density lipoprotein cholesterol, very low density lipoprotein cholesterol, homocysteine and lipoprotein (a) were also measured at the day of ECG recordings. Minimum and maximum QT intervals were measured and QT dispersion was calculated.
  
  
  RESULTS
  Mean heart rates were similar throughout the isotretinoin therapy. Serum levels of lipids, homocysteine and lipoprotein (a) all increased significantly at the end of the first month and remained significantly elevated at the end of sixth month (P is less than 0.05 for both stages). QT intervals and QT dispersion did not differ significantly throughout the six months of isotretinoin therapy (P is greater than 0.05).
  
  
  CONCLUSIONS
  In patients with severe acne, six months of 0.8 mg/kg/day of isotretinoin therapy neither prolongs QT interval, nor increases QT dispersion. This effect is not related to blood lipids, homocysteine or lipoprotein (a) levels. Our findings indicate that from the point of polymorphic ventricular tachycardia risk, 0.8 mg/kg/day of isotretinoin therapy is a safe choice in acne treatment.
authors: Baskent University, Faculty of Medicine, Department of Dermatology, Konya Research Center, Konya, Turkey.
authors: Recep
authors: R
authors: Dursun
authors: Mete
authors: M
authors: Alpaslan
authors: Mustafa
authors: M
authors: Caliskan
authors: Ozgur
authors: O
authors: Ciftci
authors: Sevsen
authors: S
authors: Kulaksizoglu
authors: Deniz
authors: D
authors: Seckin
authors: Haldun
authors: H
authors: Muderrisoglu
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy; D000293:Adolescent; D000328:Adult; D003879:Dermatologic Agents / Q000009:adverse effects* / Q000627:therapeutic use; D018450:Disease Progression; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D015474:Isotretinoin / Q000009:adverse effects* / Q000627:therapeutic use; D008055:Lipids / Q000097:blood*; D017270:Lipoprotein(a) / Q000097:blood*; D008133:Long QT Syndrome / Q000139:chemically induced / Q000378:metabolism*; D008297:Male; D013997:Time Factors; D055815:Young Adult
chemical_list: D003879:Dermatologic Agents; D008055:Lipids; D017270:Lipoprotein(a); D015474:Isotretinoin