To explore the effects of pre-treatment with methylene blue on reduced perioperative vascular resistance in patients with obstructive jaundice.
Hemodynamic characteristics of patients with obstructive jaundice are high cardiac output, low peripheral vascular resistance. The molecular basis for this feature is the increased production of NO. Methylene blue can increase peripheral resistance, the mechanism is: methylene blue is an oxidoreductase inhibitor, can inhibit the increased production of NO in the vascular endothelium, thereby increasing peripheral vascular resistance.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
DOUBLE
Enrollment
70
2mg / Kg of methylene blue in volume of 50ml is administrated I.V before anesthesia induction.
Southwest Hospital
Chongqing, Chongqing Municipality, China
RECRUITINGSouthwest Hospital
Chongqing, Chongqing Municipality, China
RECRUITINGPeripheral vascular resistance
the dose of vasoconstrictors used to Maintain Peripheral vascular resistance in the normal range (800 \~ 1200dyns / cm5)
Time frame: through operation completion, an average of 6 hours
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