title: Vitreous humor thermodynamics during phacoemulsification.
abstract: The purpose of this study is to determine baseline vitreous humor temperature during a combined phacoemulsification and pars plana vitrectomy (PPV) procedure; to determine what is the temperature variation during phacoemulsification; and to compare vitreous temperature to sublingual temperature. The methods used are prospective, interventional and comparative study. Patients with a diagnosis of cataract and vitreous hemorrhage, programed for a combined procedure of phacoemulsification and PPV, were included. Patients were excluded if posterior capsular rupture existed during the anterior segment procedure. A thermoprobe was inserted through a PPV trocar. Measurement of the vitreous temperature was obtained at baseline and throughout phacoemulsification, at the end of every surgical step, and every 5 min. Sublingual temperature was measured with the same probe at the end of the surgery. Room temperature was registered. Seventeen eyes of 17 patients were included. Mean sublingual temperature was 36.5 °C (standard deviation [σ] 0.26 °C). Mean total vitreous temperature was 31.47 °C (σ 2.1 °C). Mean baseline vitreous temperature was 33.04 °C (σ 0.99 °C). Comparison of sublingual temperature with baseline vitreous temperature resulted in a significant difference (t test P < 0.000. 95 % confidence interval 2.93-3.98). Temperature measured by surgical step and surgical time presented a significant decrease in temperature from baseline (Kruskal-Wallis P < 0.000, P = 0.003, respectively). Vitreous humor is significantly hypothermic when compared to sublingual temperature. Vitreous temperature decreases significantly during phacoemulsification.
authors.affiliation: Asociación Para Evitar la Ceguera en México, Universidad Nacional Autónoma de México, Vicente García Torres # 46, 04030, Mexico, Mexico, salcedovilla@gmail.com.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Salcedo-Villanueva
authors.forename: Veronica
authors.initials: V
authors.lastname: Kon-Jara
authors.forename: Mariana
authors.initials: M
authors.lastname: Harasawa
authors.forename: Guadalupe
authors.initials: G
authors.lastname: Cervantes-Coste
authors.forename: Daniel
authors.initials: D
authors.lastname: Ochoa-Contreras
authors.forename: Virgilio
authors.initials: V
authors.lastname: Morales-Cantón
authors.forename: José Luis
authors.initials: JL
authors.lastname: Guerrero-Naranjo
authors.forename: Hugo
authors.initials: H
authors.lastname: Quiroz-Mercado
authors.forename: Maurice B
authors.initials: MB
authors.lastname: Landers
mesh_terms: D000328:Adult; D000368:Aged; D001831:Body Temperature / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009799:Ocular Physiological Phenomena; D018918:Phacoemulsification; D011446:Prospective Studies; D012189:Retrospective Studies; D013816:Thermodynamics; D014821:Vitrectomy / Q000379:methods; D014822:Vitreous Body / Q000502:physiology*; D014823:Vitreous Hemorrhage / Q000601:surgery*
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