title: Echocardiographic and Doppler study of patients with heatstroke and heat exhaustion.
abstract: This is a two-dimensional and Doppler echocardiographic study of the hemodynamic changes in patients with heatstroke and heat exhaustion. It demonstrates that the hemodynamic changes in severe heat exposure reflect a hyperdynamic circulation with tachycardia and high cardiac output states. Relative hypovolemia was more pronounced in patients with heatstroke compared to patients with heat exhaustion. Signs of peripheral vasoconstriction were more often present in patients with heatstroke, while patients with heat exhaustion more often demonstrated peripheral vasodilatation.
authors.affiliation: Department of Cardiovascular Diseases, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia. maie@kfshrc.edu.sa
authors.forename: M S
authors.initials: MS
authors.lastname: Shahid
authors.forename: L
authors.initials: L
authors.lastname: Hatle
authors.forename: H
authors.initials: H
authors.lastname: Mansour
authors.forename: L
authors.initials: L
authors.lastname: Mimish
mesh_terms: D002302:Cardiac Output; D016022:Case-Control Studies; D004452:Echocardiography; D015150:Echocardiography, Doppler; D005260:Female; D006359:Heat Exhaustion / Q000000981:diagnostic imaging* / Q000503:physiopathology; D018883:Heat Stroke / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000000981:diagnostic imaging / Q000209:etiology; D014661:Vasoconstriction; D014664:Vasodilation