女，70岁。起搏器植入术后卧床3天，下床活动时突发呼吸困难、意识丧失，急检【】血气示Pa0。58mmH9。最可能的诊断是()。
__________inthoughtwhiledriving,healmostranintothecarcomingintheoppositedirection.
Moviegoersknowthatmanyspecialeffectsarecreatedbycomputers,theyoftendon'tknowisthatthesescenesstillrequirealotofwork.