【单选题】【消耗次数：1】
法洛四联症患儿喜蹲踞是因为这能使（ ）
①
心脑供血增加
②
缓解漏斗部痉挛
③
腔静脉回心血量增加
④
增加体循环阻力，减少右向左分流血量
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法洛四联症行右室造影时，见左室及主动脉与右室肺动脉同时显影，提示
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左室及主动脉正常显影
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