TY - JOUR
T1 - Early and mid-term effects of obstructive apneas in myocardial injury and inflammation.
AU - Bonsignore, Maria Rosaria
AU - Dalmases, Mireia
AU - Navajas, Daniel
AU - Montserrat, Josep M.
AU - Farré, Ramon
AU - Ramírez, Josep
AU - Torres, Marta
AU - Almendros, Isaac
PY - 2011
Y1 - 2011
N2 - Background: Obstructive sleep apnea (OSA) is associated with cardiovascular disorders, but the different comorbidities in OSA patients make it difficult to know their specific effects on the development of car- diovascular injury. The aim of the present study was to investigate whether recurrent obstructive apneas could lead to myocardial injury.Methods: Thirty-six male Sprague–Dawley rats (300–350 g) were either acutely (3 h) or sustainably (5 h/ day, for 10 days) subjected to obstructive apneas with a pattern of 15 s each, 60 apneas/h. Corresponding control groups were formed for the acute and sustained models. To assess the induction of systemic inflam- mation, IL1-b was measured in plasma. Ventricular tissue injury was evaluated by histological techniques (presence of inflammatory cell infiltration, eosin autofluorescence, and detection of apoptosis).Results: After 3 h of obstructive apneas, a significant increase in IL1-b (64.9 ± 29.6 ng/ll) were observed with respect to the controls (7.3 ± 1.0 ng/ll), but no myocardial injury was present. Conversely to the acute model, the systemic inflammation triggered by obstructive apneas for 10 days was reduced. However, the percentage of area with enhanced eosin autofluorescence and of apoptotic cells (1.83 ± 0.35% and 24.4 ± 1.5%, respectively) was increased when compared to the control group (0.72 ± 0.20% and 5.0 ± 2.8%, respectively).Conclusions: This study suggests that obstructive apneas are a potential source of early systemic and ven- tricular inflammation and myocardial cell injury after sustained apneas application, which could represent an initial phase in the progression of heart disease associated with OSA.
AB - Background: Obstructive sleep apnea (OSA) is associated with cardiovascular disorders, but the different comorbidities in OSA patients make it difficult to know their specific effects on the development of car- diovascular injury. The aim of the present study was to investigate whether recurrent obstructive apneas could lead to myocardial injury.Methods: Thirty-six male Sprague–Dawley rats (300–350 g) were either acutely (3 h) or sustainably (5 h/ day, for 10 days) subjected to obstructive apneas with a pattern of 15 s each, 60 apneas/h. Corresponding control groups were formed for the acute and sustained models. To assess the induction of systemic inflam- mation, IL1-b was measured in plasma. Ventricular tissue injury was evaluated by histological techniques (presence of inflammatory cell infiltration, eosin autofluorescence, and detection of apoptosis).Results: After 3 h of obstructive apneas, a significant increase in IL1-b (64.9 ± 29.6 ng/ll) were observed with respect to the controls (7.3 ± 1.0 ng/ll), but no myocardial injury was present. Conversely to the acute model, the systemic inflammation triggered by obstructive apneas for 10 days was reduced. However, the percentage of area with enhanced eosin autofluorescence and of apoptotic cells (1.83 ± 0.35% and 24.4 ± 1.5%, respectively) was increased when compared to the control group (0.72 ± 0.20% and 5.0 ± 2.8%, respectively).Conclusions: This study suggests that obstructive apneas are a potential source of early systemic and ven- tricular inflammation and myocardial cell injury after sustained apneas application, which could represent an initial phase in the progression of heart disease associated with OSA.
KW - Animal models
KW - Inflammation
KW - Myocardial injury
KW - Obstructive sleep apnea
KW - Animal models
KW - Inflammation
KW - Myocardial injury
KW - Obstructive sleep apnea
UR - http://hdl.handle.net/10447/99296
M3 - Article
VL - 12
SP - 1037
EP - 1040
JO - Sleep Medicine
JF - Sleep Medicine
SN - 1389-9457
ER -