Original contribution
QTc prolongation indicates a poor prognosis in patients with organophosphate poisoning

https://doi.org/10.1016/S0735-6757(96)90148-5Get rights and content

Abstract

This study reviewed emergency department electrocardiograms of 223 patients with organophosphate poisoning from January 1982 to June 1994: 97 (43.5%) had QTc prolongation and were placed in group A; 126 patients without QTc prolongation were designated as group B. Compared with group B, group A patients had a higher mortality (19.6% v 4.8%, P < .001) and a higher incidence of respiratory failure (56.7% v 20.6%, P < .001). Serum cholinesterase levels were determined in the 223 patients: 92 (41.3%) were classified as severe poisoning, 32 (14.3%) as moderate, 41 (18.1%) as mild, and 58 (25.7%) as very mild. The severe group had a high incidence of QTc prolongation (P < .001), a high incidence of respiratory failure (P < 0.001), and a higher mortality rate (P < 0.001) than the other groups. Of the QTc prolongation patients, 59.8% (5592) had a high incidence of respiratory failure (78.2% v 35.1%, P < .0001) and a higher mortality rate (29.1% v 8.1%, P < 0.05) compared with 40.2% (3792) of the patients without QTc prolongation in the severe group. In conclusion, a complete electrocardiogram at the emergency department is important and of prognostic value.

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    Citation Excerpt :

    QT prolongation during the first 2–3 weeks was also reported in humans accidently exposed to OP pesticides [35,39]. However, QT prolongation did not correlate with cardiac and respiratory failure leading to death [38,39]. The absence of QT prolongation in the minipig may reflect a difference in species or a difference in exposure paradigm.

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