[Incidence of congenital heart defects in the Czech Republic--current data]. / Incidence vrozených srdecních vad v Ceské republice--aktuální data.

AIM OF STUDY: An analysis of incidence of congenital heart defects (CHD) in the Czech Republic in the 1994 - 2008 period. An assessment of absolute numbers, frequencies and incidences for particular selected diagnoses according to 10th decennial revision of International Classification of Diseases (ICD-10). An analysis of pre- and postnatal incidences of selected diagnoses and of a secondary prevention measures efficiency in the Czech Republic. TYPE OF STUDY: A retrospective epidemiological analysis of congenital anomalies from the database of the National Register of Birth Defects (NRBD) of the Czech Republic. MATERIAL AND METHODS: Data from the NRBD from the 1994 - 2008 period were used. In our study, CHD incidences (ICD-10 Q20-Q28 Congenital malformations of the circulatory system group) in the Czech Republic were analyzed. First, CHD incidences in births were assessed - absolute numbers, frequencies and incidences for particular selected diagnoses. Second, absolute numbers, frequencies and incidences of particular selected diagnoses in prenatally diagnosed fetuses and a secondary prevention measures efficiency in selected CHD were evaluated. In a third part, survival of babies with CHD during the first year of their life was analyzed. RESULTS: In the period under the study, there were a total of 1 472 610 life births in the Czech Republic. Congenital malformations of the circulatory system (Q20-Q28) present more than 40% of all registered congenital anomalies and are themselves the most frequent birth defect group in births in the Czech Republic. As a whole, 29 133 CHD were diagnosed (197.83 per 10 000 live births) in 18 811 children (127.53 per 10 000 live births) in this period, which presents more than 36% of children born with a congenital anomaly in the Czech Republic during 1994 - 2008. CHD most frequently diagnosed in births were congenital malformations of cardiac septa (total 16 428, 145.05 per 10 000 live births, more than 55% of all CHD) and congenital malformations of great arteries (total 5389, 47.58 per 10 000 live births, more than 18% of all CHD). Further, prenatally diagnosed CHD were analyzed. Incidences for particular diagnoses as well as percentage of pregnancy termination were assessed. A rate of prenatally diagnosed was 11.35% in discordant ventriculoarterial connection (Q20.3), 8.35% in discordant atrioventricular connection (Q20.5), 49.41% in hypoplastic left heart syndrome (Q23.4), 7.64% in coarctation of aorta (Q25.1) and 9.71% in tetralogy of Fallot (Q21.3). These anomalies were parts of chromosomal syndromes in 42.58% and non-chromosomal syndromes in 9.33%. There were also associated malformations (from other systems than circulatory one). The most frequent were congenital malformations of the nervous system (Q00-Q07) - 14.59%, congenital malformations and deformations of the musculoskeletal system (Q65-Q79) - 12.44%, cleft lip and cleft palate (Q35-Q37) - 7.42% and congenital malformations of the urinary system (Q60-Q64) - 6.70%. In children born with a CHD, 84.53% were associated with other anomaly, out of which more than 70% were CHD only. Only about 14% were associated with anomalies from other (non-circulatory system) groups. Perinatal mortality was highest in hypoplastic left heart syndrome (Q23.4) - 327.103 per thousand and in tetralogy of Fallot (Q21.3) - 6.565 per thousand. CONCLUSIONS: The study presents current results of analysis of CHD incidences in the Czech Republic in the 1994 - 2008 period. Children born with a CHD make more than 36% out of all children born with a congenital anomaly. CHD themselves represents an important part (more than 40%) of all diagnosed congenital anomalies in the Czech Republic. Over the period of the study there was a slight increase of diagnosed CHD during 1994 - 1999 followed by a slight decrease from 2000 with an exception of 2007 year. The most frequent of diagnosed CHD were ventricular septal defect (Q21.0) and atrial septal defect (Q21.1). Both defects incidences changes influence not only a total CHD but also a total congenital anomalies incidence. An influence of prenatal diagnostics among the five selected CHD was most important in hypoplastic left heart syndrome (Q23.4), less so in others. In prenatal diagnostics group, it is necessary to distinguish between those anomalies, which led to pregnancy termination (parts of both chromosomal and non-chromosomal syndromes and/or association with other severe anomalies) and those in which pregnancy leads to a delivery (late diagnostics, operabile defects, parental decision). CHD can be a part of chromosomal syndromes. In our study, in prenatally diagnosed CHD it was more than 42%. A presence of other associated diagnoses of congenital anomalies in births will significantly influence infant mortality and morbidity.

[Birth defects in births in the Czech Republic regions in 1994 - 2007]. / Vrozené vady u narozených detí v jednotlivých krajích Ceské republiky v období let 1994 - 2007.

AIM OF STUDY: An analysis of occurrence of birth defects in the Czech Republic regions in 1994 - 2007. An assessment of total numbers and relative incidences of birth defects in births according to Tenth Revision of International Classification of Diseases (ICD-10). TYP OF STUDY: Retrospective epidemiological analysis of birth defects incidences in the Czech Republic and its particular regions from the Czech National Birth Defects Register database. MATERIAL AND METHODS: Data from the National Birth Defects Register (Institute for Health Information and Statistics) in the Czech Republic in the 1994 - 2007 period were used. In this study, particular diagnoses--as they were registered in the National Register--were analyzed. The diagoses in study were divided into following eleven birth defects groups according to ICD-10 classification: (Q00-Q07) nervous system, (Q10-Q18) eye, ear, face and neck, (Q20-Q28) circulatory system, (Q30-Q34) respiratory system, (Q35-Q37) cleft lip and cleft palate, (Q38-Q45) digestive system, (Q50-Q56) genital organs, (Q60-Q64) urinary system, (Q65-Q79) musculoskeletal system, (Q80-Q89) other defects and (Q90-Q99) chromosomal abnormalities, not elsewhere classified. Prenataly diagnosed cases were not included. Birth defects in births were analyzed both in terms of the whole Czech Republic and its 14 particular administrative regions: Prague (the Capital City), Stredoceský, Jihoceský, Plzenský, Karlovarský, Ustecký, Liberecký, Královéhradecký, Pardubický, Vysocina, Jihomoravský, Olomoucký, Zlínský and Moravskoslezský. RESULTS: During 1994 - 2007 period, totally 1,353,040 children were born on the area of the Czech Republic, out of which 44,343 with a birth defect (totally 65,186 birth defects diagnoses). The diagoses in study were divided into eleven groups according to ICD-10 classification. Further, particular diagnoses according to ICD-10 and their verbal descriptions are presented in tables. Each group is accompanied by data on its total number and a relative incidence (per 10,000 live births) with a 95% C.I. A relative frequency of the birth defects groups in study (in % from the total number of birth defects) is as follows: (Q00-Q07) nervous system 2.10, (Q10-Q18) eye, ear, face and neck 4.76, (Q20-Q28) circulatory system 39.63, (Q30-Q34) respiratory system 1.03, (Q35-Q37) cleft lip and cleft palate 3.67, (Q38-Q45) digestive system 4.05, (Q50-Q56) genital organs 10.93, (Q60-Q64) urinary system 7.08, (Q65-Q79) musculoskeletal system 18.90, (Q80-Q89) other defects 5.55 and (Q90-Q99) chromosomal abnormalities 2.28. Relative number of birth defects per region (in % from the total number of birth defects) and deviations from a mean incidence of birth defects in the Czech Republic (total Czech Republic expressed as 100%, in brackets) were calculated for each particular region: Prague (the Capital City) 10.75 (97.82), Stredoceský 11.27 (102.25), Jihoceský 6.13 (99.53), Plzenský 5.27 (105.03), Karlovarský 3.09 (134.15), Ustecký 8.67 (118.03), Liberecký 4.38 (82.93), Královéhradecký 5.41 (112.14), Pardubický 5.04 (110.32), Vysocina 5.11 (99.43), Jihomoravský 10.76 (79.11), Olomoucký 6.16 (79.47), Zlínský 5.58 (90.60) and Moravskoslezský 12.39 (105.91). CONCLUSIONS: The study gives updated results of incidences analysis of birth defects in births in the Czech Republic and its 14 administrative regions during the 1994 - 2007 period. Variance in birh defects occurrence was found, reflecting more a distribution of incidences according to smaller administrative units (districts) than to a regional distribution. Less important differences in birth defects groups incidences between particular regions were also found.

[Tumors in children with birth defects. Current data from the Czech Republic]. / Nádorová onemocnení u detí narozených s vrozenou vadou aktuální data v Ceské republice.

AIM OF STUDY: An analysis of birth defects incidences in a co-incidence with children age tumors in the Czech Republic in 1994 - 2005. Some bio-social factors (maternal age, birth weight, gestational week at birth) and their roles were studied as well. TYPE OF STUDY: Retrospective demografic-epidemiological analysis of birth defects and children age tumors incidences in children born in the Czech Republic during 1994 - 2005. MATERIAL AND METHODS: Data from the National Birth Defects Register and National Oncological Register (both run in the Institute for Health Information and Statistics) in the Czech Republic were used along with some additional data from the Register of newborns and Register of mothers at childbirth. Out of these data, a group of children with both birth defect and tumor was analyzed according to particular diagnoses and to some selected bio-social factors. Out of the total number 1707 children with tumor (934 (54.7%) boys and 773 (45.3%) girls) were 1572 children without birth defect and 135 with both tumor and birth defect. Total number of children with birth defect were 39 197 (39 059 live births and 138 stillbirths), 22 741 (58.1%) boys and 16 435 (41.9%) girls (in 21 cases the sex was not specified). In these children totally 53 539 birth defect diagnoses were registered (30 739 in boys, 22 781 in girls and 19 in children with unspecified sex). RESULTS: In 1572 children without birth defect and with tumor, a mean age at time of tumor diagnosis was 3.6 years, in 135 children with both tumor and birth defect was 2.2 years, which is significantly lower (p < 0.001, Mann-Whitney U test). No statistically significant difference was found in birthweight and birthlenght and gestational week and maternal age at time of delivery. An increased frequency of tumors in the group of children with birth defect was found in groups mesothelial tumors (C45 - C49), tumors of urinary tract (C64 - C68) and tumors of head and neck (C00 - C14, C30 - C31). On the other hand, a decreased tumor frequency in the group of children with birth defect was found in groups of lymfoid and haematopoietic tumors ((C81 - C96) and tumors of eye and brain (C69 - C72). As a risk factor of tumorigenesis in in children with birth defect was a birth defect from groups of defects of cardiovascular system, uropoietic system, chromosal aberrations and other unspecified defects. In children with both birth defect and tumor a decreased survival rate (p = 0.0437, Log-rank test) was found. A decreased survival rate was also confirmed after tumor diagnosis, although this decrease was not statistically significant (p = 0.2021, Log-rank test). There is also a highly statistically significant difference (p < 0.001, Log-rank test) in survival between groups with and without a birth defect prior to tumor diagnosis. CONCLUSIONS: A higher risk of tumorigenesis in children with birth defect (compared to children without birth defect) was confirmed. There was also a lower survival in a group of children with tumor and birth defect compared to those with tumor and without birth defects. A higher risk of tumorigenesis in some types of birt defects was also found.

[Birth defects in the Czech Republic in 1994--2007]. / Vrozené vady v Ceské republice v období 1994-2007.

AIM OF STUDY: An analysis of occurrence of birth defects in the Czech Republic in 1994-2007. An assessment of total numbers and relative incidences of birth defects in births according to Tenth Revision of International Classification of Diseases (ICD-10). TYPE OF STUDY: Retrospective epidemiological analysis of birth defects incidences from the Czech National Birth Defects Register database. MATERIAL AND METHODS: Data from the National Birth Defects Register (Institute for Health Information and Statistics) in the Czech Republic in the 1994-2007 period were used. In this study, particular diagnoses--as they were registered in the National Register--were analyzed. The diagnoses in study were divided into following eleven birth defects groups according to ICD-10 classification: (Q00-Q07) nervous system, (Q10-Q18) eye, ear, face and neck, (Q20-Q28) circulatory system, (Q30-Q34) respiratory system, (Q35-Q37) cleft lip and cleft palate, (Q38-Q45) digestive system, (Q50-Q56) genital organs, (Q60-Q64) urinary system, (Q65-Q79) musculoskeletal system, (Q80-Q89) other defects and (Q90-Q99) chromosomal abnormalities, not elsewhere classified. Prenataly diagnosed cases are not included. RESULTS: During 1994-2007 period, totally 1,353,040 children were born on the area of the Czech Republic, out of which 44,343 with a birth defect. The diagoses in study were divided into eleven groups according to ICD-10 classification. Further, particular diagnoses according to ICD-10 and their verbal descriptions are presented in tables. Each group is accompanied by data on its total number and a relative incidence (per 10,000 live births) with a 95% C.I.. A relative frequency of the birth defects groups in study (in % from the total number of birth defects) is as follows: (Q00-Q07) nervous system 2.10, (Q10-Q18) eye, ear, face and neck 4.76, (Q20-Q28) circulatory system 39.63, (Q30-Q34) respiratory system 1.03, (Q35-Q37) cleft lip and cleft palate 3.67, (Q38-Q45) digestive system 4.05, (Q50-Q56) genital organs 10.93, (Q60-Q64) urinary system 7.08, (Q65-Q79) musculoskeletal system 18.90, (Q80-Q89) other defects 5.55 and (Q90-Q99) chromosomal abnormalities 2.28. CONCLUSIONS: The study gives updated results of incidences analysis of postnatally diagnosed birth defects (available on the date of August 31, 2008) in the Czech Republic in the 1994-2007 period. Data on birth defects were collected in the National Birth Defects Register (Institute for Health Information and Statistics). Birth defects registration is a compulsory process and is a part of the National Health Information System. The diagnoses in study were divided into eleven groups according to ICD-10 classification. Total numbers, relative incidences (per 10 000 live births, with a 95% C.I.) and relative frequencies of the birth defects groups are presented.

[Prenatal diagnostics of chromosomal aberrations Czech Republic: 1994-2007]. / Prenatální diagnostika chromozomálních aberací Ceská republika: 1994-2007.

AIM OF STUDY: An analysis of prenatal diagnostics efficiency of selected types of chromosomal aberrations in the Czech Republic in 2007. Update of 1994-2007 data according to particular selected diagnoses. TYPE OF STUDY: Retrospective epidemiological analysis of pre- and postnatal chromosomal aberrations diagnostics and its efficiency. MATERIAL AND METHODS: Data on pre- and postnatally diagnosed birth defects in the Czech Republic during 1994-2007 were used. Data on prenatally diagnosed birth defects (and for terminated pregnancies) were collected from particular departments of prenatal diagnostics, medical genetics and ultrasound diagnostics in the Czech Republic, data on birth defects in births from the National Birth Defects Register (Institute for Health Information and Statistics). Total numbers over the period under the study, mean incidences of selected types of chromosomal aberrations and mean prenatal diagnostics efficiencies were analyzed. Following chromosomal aberrations were studied: Down, Edwards, Patau, Turner and Klinefelter syndromes and syndromes 47,XXX and 47,XYY. RESULTS: A relative proportion of Down, Edwards and Patau syndromes as well as other autosomal and gonosomal aberration is presented in figures. Recently, trisomies 13, 18 and 21 present around 70% of all chromosomal aberrations in selectively aborted fetuses, in other pregnancies, "other chromosomal aberrations" category (mostly balanced reciprocal translocations and inversions) present more than 2/3 of all diagnoses. During the period under the study, following total numbers, mean relative incidences (per 10,000 live births, in brackets) and mean prenatal diagnostics efficiency (in %) were found in following chromosomal syndromes: Down syndrome 2,244 (16.58) and 63.37%, Edwards syndrome 521 (3.85) and 79.93%, Patau syndrome 201 (1.49) and 68.87%, Turner syndrome 380 (2.81) and 79.89%, 47,XXX syndrome 61 (0.45) and 59.74%, Klinefelter syndrome 163 (1.20) and 73.65% and 47,XYY syndrome 22 (0.16) and 54.76%. CONCLUSIONS: The study gives updated results of incidences analysis of both pre- and postnatally diagnosed chromosomal birth defects in the Czech Republic during the 1994-2007 period. Incidences found in our study correspond (in case of trisomies 13, 18 and 21) with those published widely in literature as well as with those found in large-scale international studies (ICBDSR, EUROCAT). In case of gonosomal aberrations, incidences found in this study are lower that those published, most probably due to a later registration (over 15 years of age of the child) of these diagnoses.

[Birth defects incidence in children from single and twin pregnancies in the Czech Republic--current data]. / Incidence vrozených vad u detí z jednocetných a dvojcetných gravidit v Ceské republice--aktuální data.

AIM OF STUDY: An analysis of occurrence of birth defects in children from single and twin pregnancies in the Czech Republic in 1994-2007. An assessment of total numbers and relative incidences of birth defects in births according to Tenth Revision of International Classification of Diseases (ICD-10). TYPE OF STUDY: Retrospective epidemiological analysis of birth defects incidences from the Czech National Birth Defects Register database. MATERIAL AND METHODS: Data from the National Birth Defects Register (Institute for Health Information and Statistics) in the Czech Republic in the 1994-2007 period were used. In this study, particular diagnoses--as they were registered in the National Register--were analyzed. Birth defects were analyzed separetely for children from single and twin pregnancies. The diagoses in study were divided into following eleven birth defects groups according to ICD-10 classification: (Q00-Q07) nervous system, (Q10-Q18) eye, ear, face and neck, (Q20-Q28) circulatory system, (Q30-Q34) respiratory system, (Q35-Q37) cleft lip and cleft palate, (Q38-Q45) digestive system, (Q50-Q56) genital organs, (Q60-Q64) urinary system, (Q65-Q79) musculoskeletal system, (Q80-Q89) other defects and (Q90-Q99) chromosomal abnormalities, not elsewhere classified. Total numbers and mean incidences of birth defects separetely for children from single and twin pregnancies were assessed for all these 11 groups. RESULTS: In the Czech Republic during 1994-2007 period, totally 1,312,930 children were born (live births and stillbirts) from single pregnancies, whereas 42,448 from twin pregnancies. A twin rate (out of a total number of births) increased from 2.33% in 1997 to 4.17% in 2004. An overall incidence of diagnosed birth defects was 436.03 per 10,000 live births in singletons and 598.38 in twins. Birth defects incidence (per 10,000 livebirths)in singletons and twins in each of 11 birth defects groups under the study was during the 1994-2007 period as follows: (Q00-Q07) nervous system 9.45 in sigletons and 17.20 in twins, (Q10-Q18) eye, ear, face and neck 21.69 in singletons, and 18.38 in twins, (Q20-Q28) circulatory system 154.16 in singletons and 272.57 in twins, (Q30-Q34) respiratory system 4.92 in singletons and 5.65 in twins, (Q35-Q37) cleft lip and cleft palate 16.79 in singletons and 20.02 in twins, (Q38-Q45) digestive system 18.97 in singletons and 28.74 in twins, (Q50-Q56) genital organs 52.07 in singletons and 56.30 in twins, (Q60-Q64) urinary system 34.21 in singletons and 56.78 in twins, (Q65-Q79) musculoskeletal system 87.49 in singletons and 90.93 in twins, (Q80-Q89) other defects 26.06 in singletons and 22.14 in twins and (Q90-Q99) chromosomal abnormalities 10.20 in singletons and 9.66 in twins. CONCLUSIONS: The study gives differentiated results of incidences of selected types of birth defects in births according to pregnancy multiplicity. A statistically significant difference (p<0.001) in total birth defects incidence in twins compared to singletons was confirmed. Same statistical significance (p<0.001) was also found (twins compared to singletons) in following birth defects or their groups: (Q00-Q07) nervous system, Q20-Q28) circulatory system, (Q38-Q45) digestive system, (Q60-Q64) urinary system, congenital hydrocephalus, some congenital heart defects, cleft lip and/or palateoesophageal atresia, anorectal malformation, hypospadia, congenital hydronefrosis, polydactyly and syndactyly. A statistically significant difference (p<0.01) was found in spina bifida, hypoplastic left heart syndrome, duodenal atresia/stenosis, diaphragmatic hernia and Down syndrome.

[Birth defects in the Czech Republic in 2006]. / Vrozené vady v Ceské republice v roce 2006.

AIM OF STUDY: An analysis of occurrence of selected birth defects in the Czech Republic in 2006. Comparison of mean incidences of selected birth defects during the 1994-2006 to previous period data. TYPE OF STUDY: Retrospective epidemiological analysis of birth defects incidences from the Czech National Birth Defects Register database. MATERIAL AND METHODS: Data from the National Birth Defects Register (Institute for Health Information and Statistics) in the Czech Republic in the 1994-2006 period were used along with data on prenatally diagnosed and terminated pregnancies from the same period. Mean incidences of selected types of defects (anencephaly, spina bifida, encephalocele, total neural tube defects, congenital hydrocephalus, omfalocele, gastroschisis, total abdominal wall defects, diaphragmatic hernia, renal agenesis/hypoplasia, cystic kidney, Down syndrome and others) in 2006 were analyzed. For a retrospective analysis, already published data on birth defects in the Czech Republic were used. RESULTS: During 1961-2006 period, totally 6,173,629 children were born on the area of the Czech Republic, out of which almost 105,000 with a birth defect. Mean incidence was 170 per 10,000 live births. In 1994-2006, totally 1,238,398 children were born, out of which more than 42,000 with a birth defect. Mean incidence was 339 per 10,000 live births (with highest value of 414.58 in 2003). In 1994-2006, 6113 cases of prenatally detected birth defects (resulting in pregnancy termination) were registered, in relative numbers 49.3 per 10,000 live births (2006 63.3 per 10,000). During 1961-2006, totally 2028 anencephaly, 2647 spina bifida, 462 encephalocele, 5137 total neural tube defects, 3904 congenital hydrocefalus, 1627 omfalocele, 941 gastroschisis, 2568 total abdominal wall defects, 1754 cystic kidney, 1475 renal agenesis/hypoplasia, 1442 diafragmatic hernia, 6328 Down syndrome, 994 oesophageal defects, 1670 anorectal malformations, 6856 cleft lip and/or palate and 4440 cleft palate cases were registered. Current incidences for 2006 and mean incidences for the 1961-2006 period (in brackets), both per 10,000 live births were as follows: anencephaly 2.17 (3.34), spina bifida 4.82 (4.36), encephalocele 1.23 (0.76), total neural tube defects 8.22 (8.47), congenital hydrocefalus 3.78 (6.43), omfalocele 3.12 (2.68), gastroschisis 2.46 (1.55), total abdominal wall defects 5.57 (4.23), cystic kidney 8.98 (2.89), renal agenesis/hypoplasia 8.60 (2.43), diafragmatic hernia 3.78 (2.38), Down syndrome 20.32 (10.43), oesophageal defects 1.56 (1.61), anorectal malformations 2.54 (2.71), cleft lip and/or palate 5.47 (11.11) and cleft palate 7.42 (7.19). CONCLUSIONS: The study gives updated results of incidences analysis of both pre- and postnatally diagnosed birth defects in the Czech Republic until 2006. Some birth defect incidences in live birth are decreasing recently (neural tube defects, abdominal wall defects, Down syndrome), some are increasing (oesophageal defects, anorectal malformations). Some incidences in births are influenced by an increased efficiency of diagnostics (renal defects) some remain more or less on the same level (diaphragmatic hernia) or just oscillate (facial defects).

[Ultrasound prenatal diagnostics of birth defects in the Czech Republic in 1994-2007]. / Prenatální diagnostika vrozených vad diagnostikovaných ultrazvukem Ceská republika 1994-2007.

AIM OF STUDY: An analysis of prenatal diagnostics efficiency of selected birth defects in the Czech Republic in 2007. Update of 1994-2007 data according to particular defects. TYPE OF STUDY: Retrospective epidemiological analysis of pre- and postnatal diagnostics of selected birth defects and prenatal diagnostics efficiency. MATERIAL AND METHODS: Data on pre- and postnatally diagnosed birth defects in the Czech Republic during 1994-2007 were used. Data on prenatally diagnosed birth defects (and for this terminated pregnancies) were collected from particular departments of prenatal diagnostics, medical genetics and ultrasound diagnostics in the Czech Republic, data on birth defects in births from the National Birth Defects Register (Institute for Health Information and Statistics). Total numbers and mean incidences of selected types of defects (anencephaly, spina bifida, encephalocele, congenital hydrocefalus, omfalocele, gastroschisis, diafragmatic hernia, cystic kidney, renal agenesis/hypoplasia, transposition of great vessels, tetralogy of Fallot, hypoplastic left heart syndrome and coarctation of aorta) during the period under the study were analyzed. Prenatal diagnostics efficiency of these defects was also assessed. RESULTS: Following total numbers of particular birth defects were registered during the 1994-2007 period: anencephaly 380, spina bifida 559, encephalocele 1134, congenital hydrocefalus 584, omfalocele 351, gastroschisis 389, diafragmatic hernia 325, cystic kidney 698, renal agenesis/hypoplasia 679, transposition of great vessels 797, tetralogy of Fallot 723, hypoplastic left heart syndrome 533 and coarctation of aorta 973. Mean incidences (per 10,000 live births) and prenatal diagnostics rate (%, in brackets) were as follows: anencephaly 2.81 (95.65), spina bifida 4.13 (61.12), encephalocele 0.99 (77.04), congenital hydrocefalus 4.32 (49.61), omfalocele 2.59 (54.97), gastroschisis 2.88 (77.30), diafragmatic hernia 2.40 (22.02), cystic kidney 5.16 (24.80), renal agenesis/hypoplasia 5.02 (25.97), transposition of great vessels 6.93 (7.85), tetralogy of Fallot 6.28 (5.87), hypoplastic left heart syndrome 4.63 (39.86) and coarctation of aorta 8.46 (3.80). CONCLUSIONS: The study gives updated results of ultrasound prenatal diagnostics of selected types of birth defects in the Czech Republic during the 1994-2007 period. Ultrasound prenatal diagnostics contributes to a decrease of some birth defect in a newborn population as well as to changes of their spectrum in births, especially in lethal and most severe ones. Ultrasound prenatal diagnostics experienced both qualitative and quantitative progress in last years in the Czech Republic, resulting in in higher efficiency of prenatal detection of major birth defects in population as well as in separating of associated defects and syndromes, particulary those with a general good prognosis.