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決定孕媽是否能順產的4大要點(3)

出處：媽媽育兒網(wǎng) 日期：2013-05-25 11:30:22 編輯：Chen

　　三、Passenger：胎兒大小

　　胎寶寶的大小也是決定能否順利生產的重要因素之一。在臨近生產肘，胎寶寶的頭部先下降到骨盆中。為了能順利通過產道，胎寶寶也做著各種努力。寶貝被動地進行一系列適應性轉動，希望能以最好的姿勢通過產道。

　　在分娩過程中，如果胎寶寶過大(體重>4千克)，那么寶寶的頭部就很難通過中骨盆(骨盆最狹窄面)，因為寶寶的頭部是全身直徑最大的部分。

　　當然也有特例，有的胎寶寶體重并不是很大，但卻長了個又大又圓的腦袋，這也會讓順產變得艱難。此外，胎寶寶頭部的位置也非常重要。如果頭部位置不佳，則需要選擇剖腹產。

決定孕媽是否能順產的4大要點

　　四、Passage：產道大小

　　產道的大小直接決定胎寶寶能否順利通過。產道泛指胎寶寶進入骨盆的入口、中骨盆、骨盆的出口。它分為骨產道和軟產道，我們通常講的“骨盆”就是指骨產道。

　　老人們常說：“屁股大的女人好生養(yǎng)。”這其實有一定道理。屁股大一般“骨盆”較大。而“骨盆”是產道的一部分。骨盆的大小、形狀與分娩密切相關。

　　骨盆分為三個部分：即骨盆入口、中骨盆、骨盆出口。

　　骨盆入口：如果骨盆入口足夠寬大，胎寶寶的頭部就能順利地進入中骨盆，這是自然產的第一關。

　　中骨盆：這是骨盆中最狹窄平面，骨盆中有“中骨盆橫徑”，也叫做“坐骨棘間距離”，兩坐骨棘間的距離，平均值為10cm。這是最重要的一關，因為胎寶寶最先露出的部分，要順利通過產道中最狹窄的地方。產科醫(yī)生表示：臨床上很多產程阻滯就是發(fā)生在此處。

　　骨盆出口：骨盆出口的大小正常，胎寶寶體重沒有超重，那么胎寶寶就能順順利利地和父母見面了。

　　大多數(shù)難產的主要因素不是因為骨盆測量異常，而是因為胎兒較大或者過大、胎頭的位置異常、胎位異常等，使原本正常的骨盆“變得不正常、位置狹小”，使得分娩困難甚至造成難產。

　　小編寄語：能順產的媽媽可以自由選擇是順產還是剖腹產，但如果不能滿足以上條件的孕媽媽，就算你想順產也不行。所以，有“權利”順產的麻麻們，可不要錯過這個來之不易的機會喲。

　　本文由媽媽育兒網(wǎng)（http://www.15thirdstreetblackrock.com/）小編編輯整理

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