# A nurse is assessing a newborn who is suspected of having an imperforate anus. Which assessment finding would be most indicative of this condition? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=542106 > language: ko > subject: Child Health ## 문제 A nurse is assessing a newborn who is suspected of having an imperforate anus. Which assessment finding would be most indicative of this condition? ## 보기 1. Meconium is passed from the urethra or vagina instead of the anus 2. Stool is passed through a normal anal opening without difficulty 3. Small amounts of stool are passed intermittently from the anus 4. Absence of an anal opening or a thin membrane covering the anus **✔ 정답** **정답: 4** ## 해설 The most definitive finding is absence of an anal opening or a thin membrane covering it, directly visible on physical exam. Other options (meconium staining, normal stool passage, intermittent stool) are not specific to imperforate anus. ## 심화 해설 Understanding Imperforate Anus in the Newborn Assessment The term imperforate anus falls under the broader classification of anorectal malformations (ARM), which are congenital defects where the anus and rectum do not develop properly. When assessing a newborn for this condition, the most direct and indicative physical finding is the absence of a normal anal opening. This can present as no visible opening at all or a thin membrane covering the anal dimple, which directly corresponds to option 4. The diagnostic process for anorectal malformations relies heavily on a thorough physical examination immediately after birth. The initial step is a visual inspection of the perineum to identify the presence and location of the anus. The absence of an anal opening is a primary indicator that necessitates immediate further investigation to determine the specific type of malformation and guide surgical planning . This finding is definitive because it represents a structural failure in the development of the proctodeum or the recanalization of the anal membrane during embryogenesis. While the absence of an anal opening is the hallmark sign, other clinical presentations can occur depending on the type of fistula present. In some cases of anorectal malformation, a fistula connects the rectal pouch to the urinary or genital tract. This can lead to the passage of meconium from the urethra or vagina, which is a significant finding but is considered a secondary sign of a fistulous connection rather than the primary definition of an imperforate anus. The presence of an ano-urethral fistula, for example, is a specific type of ARM where meconium or later stool may be observed in the urine, a finding that is more common in males . However, the initial and most critical assessment finding that triggers the entire diagnostic algorithm for a newborn suspected of having an imperforate anus is the direct observation of the perineum, where the absence of a normal anal opening is the most immediate and indicative sign . The diagnostic algorithm for these patients integrates this physical exam finding with other tools like meconium passage assessment and imaging, but the physical absence of the opening is the foundational observation . ## 임상 시나리오 Newborn Imperforate Anus AssessmentInitial Physical Examination is Key The most direct sign of an imperforate anus is the absence of a normal anal opening on visual inspection. This may appear as a thin membrane covering the anal dimple or no opening at all. A thorough perineal inspection must be performed on every newborn within the first 24 hours. Failure to pass meconium within this timeframe warrants immediate investigation for anorectal malformations. CautionDo not rely on the passage of meconium from the urethra or vagina as the primary sign. This indicates a fistula, a secondary finding. The primary assessment is direct visualization of the anal area to confirm patency. ## 핵심 개념 - **Imperforate Anus** — A congenital defect where the opening to the anus is missing or blocked, resulting from failure of the cloacal membrane to rupture during fetal development. - **Anorectal Malformation** — A spectrum of congenital anomalies affecting the structure of the anus and rectum, which includes imperforate anus and often involves fistulous connections to the urinary or genital tracts. - **Meconium** — The dark green, sterile fecal material that forms in the intestines of a fetus and is normally passed within the first 24-48 hours after birth. - **Fistula** — An abnormal connection between two body parts, such as between the rectum and the urethra or vagina, commonly associated with high-type imperforate anus. ## 같은 주제 문제 - [A nurse is assessing a newborn with suspected imperforate anus. 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