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double-blind procedure-an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.ouble-blind procedure-an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.
Blind technique is associated with significantly higher complication rate and a lower success rate. On the basis of normal human physiology, we opine that in such situations, the use of Valsalva maneuver (VM) to aid CVC increases the success rate.e had a cyst on left side of the neck and right sided skin excoriation due to a previously placed CVC in the right internal jugular vein (IJV). A platelet count of 20,000/mm 3 in the patient prevented us from trying the blind subclavian approach.