KDH veya plevral efüzyona ba¤l> da geliflebilir. Görün-
tülenen birim akci¤er dokusu miktar>na göre pulmoner
hipoplazinin derecesi, KDH olan fetüslerde KKAM'li-
lerden daha fazlad>r. Bu da KDH'de akci¤er geliflimini
s>n>rlayan kitle etkisi d>fl>nda bir mekanizma oldu¤u iz-
lenimini uyand>rmaktad>r.
KONJENMALFORMASYONLARININ SPEKTRUMU
Fetal toraksta ekojenik (Tablo 36-3) veya kistik bir lez-
yon (Tablo 36-4) konjenital pulmoner havayolu malfor-
masyon (KPHM) spektrumunun bir parças> olabilir. Bu
1276
KISIM IV
Obstetrik Ultrasonografi
TABLO 36-1. MENSTRÜEL (GESTASYONEL) YAfi
ÇEVRES< VE UZUNLU/U*
Prediktif Persentiller
YAfi (HAFTA)
2.5
5
10
25
50
75
90
95
97.5
Toraks Çevresi (cm)
18
7.7
8.2
8.8
9.8
11.0
12.1
13.1
13.7
14.2
19
8.6
9.1
9.7
10.7
11.9
13.0
14.0
14.6
15.1
20
9.5
10.0
10.6
11.7
12.9
13.9
15.0
15.5
16.0
21
10.4
11.0
11.6
12.6
13.7
14.8
15.8
16.4
16.9
22
11.3
11.9
12.5
13.5
14.6
15.7
16.7
17.3
17.8
23
12.2
12.8
13.4
14.4
15.5
16.6
17.6
18.2
18.8
24
13.2
13.7
14.3
15.3
16.4
17.5
18.5
19.1
19.7
25
14.1
14.6
15.2
16.2
17.3
18.4
19.4
20.0
20.6
26
15.0
15.5
16.1
17.1
18.2
19.3
20.3
21.0
21.5
27
15.9
16.4
17.0
18.0
19.1
20.2
21.3
21.9
22.4
28
16.8
17.3
17.9
18.9
20.0
21.2
22.2
22.8
23.3
29
17.7
18.2
18.8
19.8
21.0
22.1
23.1
23.7
24.2
30
18.6
19.1
19.7
20.7
21.9
23.0
24.0
24.6
25.1
31
19.5
20.0
20.6
21.6
22.8
23.9
24.9
25.5
26.0
32
20.4
20.9
21.5
22.6
23.7
24.8
25.8
26.4
26.9
33
21.3
21.8
22.5
23.5
24.6
25.7
26.7
27.3
27.8
34
22.2
22.8
23.4
24.4
25.5
26.6
27.6
28.2
28.7
35
23.1
23.7
24.3
25.3
26.4
27.5
28.5
29.1
29.6
36
24.0
24.6
25.2
26.2
27.3
28.4
29.4
30.0
30.6
37
24.9
25.5
26.1
27.1
28.2
29.3
30.3
30.9
31.5
38
25.9
26.4
27.0
28.0
29.1
30.2
31.2
31.9
32.4
39
26.8
27.3
27.9
28.9
30.0
31.1
32.2
32.8
33.3
40
27.7
28.2
28.8
29.8
30.9
32.1
33.1
33.7
34.2
Toraks Uzunlu¤u (cm)
16
0.9
1.1
1.3
1.6
2.0
2.4
2.8
3.0
3.2
17
1.1
1.3
1.5
1.8
2.2
2.6
3.0
3.2
3.4
18
1.3
1.4
1.7
2.0
2.4
2.8
3.2
3.4
3.6
19
1.4
1.6
1.8
2.2
2.7
3.0
3.4
3.6
3.8
20
1.6
1.8
2.30
2.4
2.8
3.2
3.6
3.8
4.0
21
1.8
2.0
2.2
2.6
3.0
3.4
3.7
4.0
4.1
22
2.0
2.2
2.4
2.8
3.2
3.6
3.9
4.1
4.3
23
2.2
2.4
2.6
3.0
3.4
3.8
4.1
4.3
4.5
24
2.4
2.6
2.8
3.1
3.5
3.9
4.3
4.5
4.7
25
2.6
2.8
3.0
3.3
3.7
4.1
4.5
4.7
4.9
26
2.8
2.9
3.2
3.5
3.9
4.3
4.7
4.9
5.1
27
2.9
3.1
3.3
3.7
4.1
4.5
4.9
5.1
5.3
28
3.1
3.3
3.5
3.9
4.3
4.7
5.0
5.4
5.4
29
3.3
3.5
3.7
4.1
4.5
4.9
5.2
5.5
5.6
30
3.5
3.7
3.9
4.3
4.7
5.1
5.4
5.6
5.8
31
3.7
3.9
4.1
4.5
4.9
5.3
5.6
5.8
6.0
32
3.9
4.1
4.3
4.6
5.0
5.4
5.8
6.0
6.2
33
4.1
4.3
4.5
4.8
5.2
5.6
6.0
6.2
6.4
34
4.2
4.4
4.7
5.0
5.4
5.8
6.2
6.4
6.6
35
4.4
4.6
4.8
5.2
5.6
6.0
6.4
6.6
6.8
36
4.6
4.8
5.0
5.4
5.8
6.2
6.5
6.8
7.0
37
4.8
5.0
5.2
5.6
6.0
6.4
6.7
7.0
7.1
38
5.0
5.2
5.4
5.8
6.2
6.6
6.9
7.1
7.3
39
5.2
5.4
5.6
6.0
6.4
6.8
7.1
7.3
7.5
40
5.4
5.6
5.8
6.1
6.5
6.9
7.3
7.5
7.7
*Chitkara U, Rosenberg J, Chevanak FA, et al. Prenatal sonographic assessment of thorax: normal values. Am J Obstet Gynecol 1987;156:1069-1074'ten al>nm>flt>r.