Wooden chest rigidity is seen with: (A) Morphine, (B) Fentanyl, (C) Remifentanyl, (D) Pentazocine
Answer is B. Fentanyl induced chest wall rigidity seen with high bolus dose of fentanyl. CWR related to opiate administration was first described by Hamilton and Cullen in 1953 . Following opiate administration, clinicians may observe significant difficulty with mask ventilation, respiratory arrest, and a rigid chest wall; this phenomenon has been noted with various opioid substances. The majority of repoed cases and physiologic studies focus on CWR occurring with high opioid doses --administeredas pa of anesthetic induction