A review and comparative analysis of recent advancements in fetal monitoring techniques

Critical Reviews in Biomedical Engineering

Volumn 36, Issue 5-6, 2008, Pages 335-373

  Tiwari, Anil Kumar ^a   Chourasia, Vijay ^a  

^a LNM INSTITUTE OF INFORMATION TECHNOLOGY   (India)

Author keywords

Fetal cardiotocography; Fetal electrocardiography; Fetal heart rate; Fetal magnetocardiography; Fetal monitoring; Fetal phonocardiography

Indexed keywords

COST EFFECTIVENESS; NEONATAL MONITORING; PHONOCARDIOGRAPHY;

CARDIOTOCOGRAPHY; FETAL ELECTROCARDIOGRAPHIES; FETAL HEART RATE; FETAL MAGNETOCARDIOGRAPHY; FETAL PHONOCARDIOGRAPHY;

FETAL MONITORING;

COMPARATIVE ANATOMY; COMPARATIVE STUDY; COST EFFECTIVENESS ANALYSIS; DIAGNOSTIC ACCURACY; ELECTRONIC FETUS MONITORING; FETUS ECHOGRAPHY; FETUS HEART RATE; FETUS MONITORING; HEALTH CARE COST; HOME MONITORING; HUMAN; MAGNETOCARDIOGRAPHY; NOISE REDUCTION; PHONOCARDIOGRAPHY; PRIORITY JOURNAL; REVIEW; SIGNAL NOISE RATIO; SIGNAL PROCESSING;

EID: 76849091712     PISSN: 0278940X     EISSN: None     Source Type: Journal    
DOI: 10.1615/CritRevBiomedEng.v36.i5-6.20     Document Type: Review

References (105)

1. Martin CB. Electronic fetal monitoring: a brief summary of its development, problem and prospects. Eur J Obstet Gynecol Reprod Biol. 1999;78(2): 133-140
2. Freeman RK, Garite TJ, Nageotte MP. Fetal heart rate monitoring. Philadelphia: Lippincott, Williams & Wilkins; 2003. pp. 1-4.
3. National Institute of Child Health and Human Development Research Planning Workshop, Electronic fetal heart rate monitoring: Research guidelines for interpretation. Am J Obstet Gynecol. 1997;177(5):1385-1390
4. Solt I, Divon MY. Fetal surveillance tests, the embryo: scientific discovery and medical ethics. Basel: Karger, 2005;291-308.
5. Signorini MG, Margenes G, Cerutti S, Arduini D. Linear and nonlinear parameters for the analysis of fetal heart rate signal from cardiotocographic recordings. IEEE Trans Biomed Eng. 2003;50(3): 365-374 (Pubitemid 36331678)
6. Malik N, Raghunandan C, Madan N. Foetal Heart-rate patterns in early labour in low and high risk pregnancies & its correlation with perinatal outcome. J Indian Med Assoc. 2002 Nov;100(11):646-650 (Pubitemid 36903520)
7. World Health Organization. Facts and figures from the world health report. The world health report on World Health Day. Geneva: WHO, 2005.
8. World Health Organization. Neonatal and perinatal mortality: country, regional and global estimates. Geneva, WHO, 2006.
9. Dawes GS, Moulden M, Redman CW, Computerized analysis of antepartum fetal heart rate. Am J Obstet Gynecol. 1995;173(4):1353-1354
10. Mantel R, van Geijn HP, Caron FJM, Swartjes JM, van Woerden EE, Jongsma HW. Computer analysis of antepartum fetal heart rate: 1. Baseline determination. Int J Biomed Comput. 1990;25(4):261-272
11. Mantel R, van Geijn HP, Caron FJM, Swartjes JM, van Woerden EE, Jongsma HW. Computer analysis of antepartum fetal heart rate: 2. Detection of accelerations and decelerations. Int J Biomed Comput. 1990;25(2):273-286
12. El-Hanjouri M, Alkhaldi W, Hamdy N, Alim OA. Heart diseases diagnosis using HMM. Proceedings of the IEEE on Electrotechnical Conferrence, MELECON 2002, 11th Meditterranean. 2002 May 7-9; 489-492
13. Kovacs F, Torok M, Habermajer I. A rule based phonocardiographic method for long term fetal heart rate monitoring. IEEE Trans Biomed Eng. 2000 January;47(1): 124-130
14. Padmanabhan V, Fischer R, Semmlow JL, Welkowitz W. High Sensitivity PCG Transducer for Extended Frequency Applications. Proceedings of the Annual International Conference of the IEEE Engineering in Engineering in Medicine and Biology Society, Images of the Twenty-First Century. 1989 Nov 9-12;1:57-58
15. Magenes G, Signorini MG, Sassi R. Automatic diagnosis of fetal heart rate: comparison of different methodological approaches. Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 2001 Oct 25-28;2:1604-1607
16. Macones GA. Intrapartum fetal heart rate monitoring: nomenclature, interpretation, and general management principles. ACOG Practice Bulletin. 2009 July;114(1):192-202.
17. Rolfe P, Scopessi F, Serra G. Biomedical Instruments for fetal and neonatal surveillance, J Phys. 2006;48:1131-1136
18. Ferrara ER, Widrow B. Fetal Electrocardiogram enhancement by time-sequenced adaptive filtering. IEEE Trans Biomed Eng. 1982 June;29(6):458-460
19. Karin J, Hirsch M, Segal O, Akselrod S. Non invasive fetal ECG monitoring. Comput Cardiol. 1994;365-368
20. Kim SI, Lee EG, Lee YH, Park MI, Lee DS. Real time processing algorithm for high resolution fetal heart rate estimation. Proceedings of the 16th Annual International Conference of the IEEE on Engineering in Medicine and Biology Society. 1994 Nov 3-6;2:1288-1289
21. Ter Brake HJM, Rijpma AP, Stinstra JG, Borgmann J, Holland HJ, Krooshoop HJG, Peters MJ, Flokstra J, Quartero HWP, Rogalla H. Fetal magnetocardiography: clinical relevance and feasibility. Physica C: Superconductivity. 2002 March;368(1-4):10-17.
22. Elchalal U, Weissman A, Abramov Y, Abramov D, Weinstein D. Intrapartum fetal pulse oximetry: present and future. Int J Gynaecol Obstet. 1995 August;50(2):131-137
23. Tan BH, Moghavvemi M. Real time analysis of fetal phonocardiography. Proceedings of TENCON. 2000 Sept 24-27;2:135-140
24. Mazzeo JR. Non-invasive fetal electrocardiography. Med Prog Technol. 1994;20(1-2):75-79
25. Stinstra JG. The reliability of the fetal magnetocardiogram. Doctoral thesis, University of Twente, The Netherlands, 2001.
26. Pieri J, Crowe J, Hayes-Gill B, Bhogal K, James D. Fetal and maternal heart rate derivation, from transabdominal ecg recordings. IEE Colloquium on Medical Applications of Signal Processing. 1999;17/1-17/6.
27. Outram NJ, Ifeachor EC, Van Eetvelt PWJ, Curnow JSH. Techniques for optimal enhancement and feature extraction of fetal electrocardiogram. IEE Proceedings on Science, Measurement and Technology. 1995 Nov;142(6):482-489
28. Vijila CKS, Kanagasabapathy P, Johnson S. Fetal ECG extraction using softcomputing technique. J Appl Sci. 2006;6(2):251-256
29. Medina VU, Gonzalez-Comarena R, Echeverria JC. effect of noise sources on the averaged PQRST morphology. Comput Cardiol. 2005;32:743-746
30. Ayat M, Assaleh K, Nashash H, Fetal ECG extraction from a single abdominal ECG signal using SVD and polynomial classifiers. IEEE Workshop on Machine Learning for Signal Processing MLSP 2008. 2008 Oct 16-19;250-254
31. Gupta A, Srivastava MC, Khandelwal V. A novel approach to fetal ECG extraction and enhancement using blind source separation (BSS-ICA) and adaptive fetal ECG enhancer (AFE). 6th International Conference of the IEEE on Information, Communications & Signal Processing. 2007 Dec 10-13;1-4.
32. Pani D, Argiolas S, Raffo L, A DSP Algorithm and System for Real-Time Fetal ECG Extraction. Comput Cardiol. 2008;35:1065-1068
33. Zhou X, Engler P, Coblentz MG. Adaptive filter application in fetal electrocardiography. Proceedings of the Fifth Annual IEEE Symposium on Computer-Based Medical Systems. 1992 Jun 14-17;656-662.
34. Karvounis EC, Tsipouras MG, Fotiadis DI, Naka KK. An automated methodology for fetal heart rate extraction from the abdominal electrocardiogram. IEEE Transactions on Information Technology in Biomedicine. 2007 Nov;11(6):628-638
35. Westgate J, Keith RDF, Curnow JSH, Ifeachor EC, Greene KR. Suitability of fetal scalp electrodes for monitoring the fetal electrocardiogram during labour. Clin Phys Physiol Meas. 1990;11:297-306.
36. Sharf Y, Farine D, Batzalel M, Megel Y, Shenhav M, Jaffa A, Barnea O. Continuous monitoring of cervical dilatation and fetal head station during labor. Med Eng Phys. 2007 Jan;29(1):61-71.
37. Sheikh M, Algunaidi M, Mohd Ali MA, Gan KB, Zahedi E. Fetal heart rate monitoring based on adaptive noise cancellation and maternal QRS removal window. Eur J Sci Res. 2009;27(4):565-575
38. Widrow B, Glover JR, Mccool JM, Kaunitz J, Williams Cs, Hean RH, Zeidler JR, Dong E, Goodlin RC. Adaptive noise canceling: Principle and application. Proceedings of IEEE. 1975 Dec;63:1692-1716.
39. Algunaidi MSM, Mohd Ali MA, Gan KB, Zahedi E. Fetal heart rate monitoring based on adaptive noise cancellation and maternal QRS removal window. Eur J Sci Res. 2009;27(4):565-575
40. Jatoth RK, Anoop SSVKK, Prabhu CM. Biologically inspired evolutionary computing tools for the extraction of fetal electrocardiogram. WSEAS Trans Signal Process. 2009 March;5(3): 106-115
41. Kanjilal PP, Palit S. On multiple pattern extraction using singular value decomposition. IEEE Trans Signal Process. 1995;43(6):1536-1540
42. Kanjilal PP, Palit S, Saha G. Fetal ECG extraction from single-channel maternal ecg using singular value decomposition. IEEE Trans Biomed Eng. 1997 January;44(1):51-59
43. Lathauwer LD, Moor BD, Vandewalle J. Fetal electrocardiogram extraction by source subspace separation. Proceedings of IEEE SP/ATHOS Workshop HOS, Girona, Spain, 1995;134-138
44. Zarzoso V, Nandi AK, Bacharakis E. Maternal and fetal ECG separation using blind source separation methods. IMA J Math Appl Med Biol. 1997;14(3):207-225 (Pubitemid 127463780)
45. Zarzoso V, Nandi AK. Noninvasive fetal electrocardiogram extraction: blind separation versus adaptive noise cancellation. IEEE Trans Biomed Eng. 2001;48(1): 12-18 (Pubitemid 32165706)
46. Zarzoso V, Comon P. Robust independent component analysis for blind source separation and extraction with application in electrocardiography. 30th Annual International IEEE EMBS Conference Vancouver, British Columbia, Canada, August 20-24, 2008;3344-3347
47. Khamene A, Negahdaripour S. A new method for extraction of fetal ecg from the composite abdominal signal.IEEE Trans Biomed Eng. 2000 April;47(4):507-516 (Pubitemid 30187520)
48. Assaleh K, Al-Nashash H. A novel technique for the extraction of fetal ECG using polynomial networks. IEEE Trans Biomed Eng. 2005 Jun;52(6):1148-1152
49. Assaleh K. Extraction of fetal electrocardiogram using adaptive neuro-fuzzy inference system. IEEE Trans Biomed Eng. 2007 January;54(1):59-68.
50. Ahmadi M, Ayat M, Assaleh K, Al-Nashash H. Fetal ECG signal enhancement using polynomial classifiers and wavelet denoising. Biomedical Engineering Conference, CIBEC 2008, Cairo International. 2008 Dec 18-20; 1-4.
51. Martens SMM, Rabotti C, Mischi M, Sluijter RJ. A robust fetal ECG detection method for abdominal recordings. Physiol Meas. 2007;28:373-388 (Pubitemid 46540441)
52. Oostendorp TF, van Oosterom A. Electrical properties of tissues involved in the conduction of fetal ECG. Med Biol Eng Comput. 1989 May;27(3):322-324
53. Crowe JA, Woolfson MS, Hayes-Gill BR, Peasgood W, Mohd-Ali MA, Huang Y, Herbert J, Huang XB, Harrison A, Gibson NM, Symonds EM, Reed N, Mohajer M. Antenatal assessment using the FECG obtained via abdominal electrodes. J Perinat Med. 1996;24(1):43-53. (Pubitemid 26076115)
54. Papaloukas C, Fotiadis DI, Likas A, Liavas AP, Michalis LK. A knowledge-based technique for automated detection of ischaemic episodes in long duration electrocardiograms. Med Biol Eng Comput. 2001 January;39(1):105-112
55. Foresta FL, Mammone N, Morabito FC. Independent component and wavelet analysis for fECG extraction: the stwaveform evaluation. International Conference of the IEEE on Computational Intelligence for Measurement Systems and Applications. 2005 July 20-22;86-90.
56. Vijila CKS, Kanagasabapathy P, Johnson S. Adaptive Neuro Fuzzy Inference System for Extraction of fECG. Proceedings of Annual Conference of the IEEE, INDICON. 2005 Dec 11-13;224-227
57. Vigneron V, Paraschiv-Ionescu A, Azancot A, Sibony O, Jutten C. Fetal Electrocardiogram Extraction Based on Non-Stationary ICA and Wavelet Denoising. Proceedings of the Seventh International Symposium on Signal Processing and Its Applications. 2003 July 1-4;2:69-72.
58. Matonia A, Jezewski J, Kupka T, Horoba K, Wrobel J, Gacek A. The influence of coincidence of fetal and maternal QRS complexes on fetal heart rate reliability. Med Biol Eng Comput. 2006 May;44(5):393-403.
59. Lauersen NH, Hochberg HM, George ME. Microprocessor-controlled doppler: A new fetal heart rate monitoring technique. J Reprod Med. 1982 Jun;27(6):352-356
60. Shakespeare SA, Crowe JA, Hayes-Gill BR, Bhogal K, James DK. The information content of Doppler ultrasound signals from the fetal heart. Med Biol Eng Comput. 2001 Nov;39(6):619-626
61. Hanqing C, Lake DE, Ferguson II JE, Chisholm CA, Griffin MP, Moorman JR. Toward quantitative fetal heart rate monitoring. IEEE Trans Biomed Eng. 2006 January;53(1):111-118
62. Peters CHL, ten Broeke EDM, Andriessen P, Vermeulen B, Berendsen RCM, Wijn PFF, Oei SG. Beat-to-beat detection of fetal heart rate: Doppler ultrasound cardiotocography compared to direct ECG cardiotocography in time and frequency domain. Physiol Meas. 2004;25(2):585-593
63. Karlsson B, Pourcelot D, Pourcelot L, Berson M. Miniature Sensor for Doppler Ultrasound fetal heart rate monitoring. Increased patient comfort and ergonomy in use. Conference of the IEEE on Instrumentation and Measurement Technology Brussels, Belgium. 1996 June 4-6;1336-1338
64. Hua X, Kaiqing L, Zhenxi Z. A new algorithm for detecting fetal heart rate using ultrasound Doppler signals. Ultrasonics. 2005 May;43(6): 399-403.
65. Kaluzinski K, Berson M, Pourcelot L, Palko T. Detection of fetal breathing and cardiac movements and rythms in ultrasonic Doppler signal recorded on the surface of the maternal abdomen. Med Biol Eng Comput 1993;11:405-411 (Pubitemid 23234219)
66. Kupka T, Jezewski J, Matonia A, Horoba K, Wrobel J. Timing events in Doppler ultrasound signal of fetal heart activity. 26th Annual International Conference of the IEEE on Engineering in Medicine and Biology Society, IEMBS. 2004 Sept 1-5;1:337-340
67. Jezewski M, Wrobel J, Labaj P, Leski J, Henzel N, Horoba K, Jezewski J. Some practical remarks on neural networks approach to fetal cardiotocograms classification. 29th Annual International Conference of the IEEE on Engineering in Medicine and Biology Society. 2007 Aug 22-26;5170-5173
68. Alfirevic Z, Devane D, Gyte GML. Continuous cardiotocography (CTG) as a form of electronic fetal monitoring (EFM) for fetal assessment during labour. Cochrane Database Syst Rev. 2006 July 19;(3).
69. Kaluzynski K, Kret T, Sienko J. On the wavelet analysis of the Doppler signals of fetal activity. Proceedings of the Fifth IASTED International Conference on Biomedical Engineering; 2007 Feb 14-16. Innsbruck, Austria: ACTA Press; 2007:180-185
70. Jezewski J, Wrobel J, Horoba K. Comparison of Doppler ultrasound and direct electrocardiography acquisition techniques for quantification of fetal heart rate variability. IEEE Trans Biomed Eng. 2006 May;53(5): 855-864
71. Fatemi M, Ogburn PR, Greenleaf JF. Fetal stimulation by pulsed diagnostic ultrasound. J Ultrasound Med. 2001;20(8):883-889 (Pubitemid 32709003)
72. Leeuwen PV, Bettermann H, Schüßler M, Lange S. Magnetocardiography in the determination of fetal heart rate complexity. Advances in Biomagnetism Research: Biomag '96. New York (NY): Springer; 1998.
73. Rassi D. Antenatal fetal magnetocardiography using SQUID. IEE Colloquium on Magnets in Medicine - Hazards and Health Care. 1995 Oct;(9):2/1-2/3.
74. Uzunbajakau SA, Golbach EGM, Stinstra JG, Peters MJ. A sensitive magnetocardiograph for fetal surveillance. Proceedings of the 23rd Annual International Conference of the IEEE on Engineering in Medicine and Biology Society. 2001;1:378-380
75. Brazdeikis A, Vazquez-Flores GJ, Tan IC, Padhye NS, Verklan MT. Acquisition of Fetal Magnetocardiograms in an Unshielded Hospital Setting. IEEE Trans Appl Supercond. 2007 June;17(2):823-826
76. Mantini D, Comani S, Alleva G, Romani GL. Fetal cardiac time intervals: validation of an automatic tool for beat-to-beat detection on fetal magnetocardiograms. Intl J Bioelectromagnetism. 2005;7(1):247-250
77. Verklan TM, Padhye NS, Brazdeikis A. analysis of fetal heart rate variability obtained by magnetocardiography. J Perinat Neonatal Nurs. 2006 Oct/Dec;20(4):343-348
78. Smith FE, Langley P, van Leeuwen P, Hailer B, Trahms Lz, Steinhoff U, Bourke JP, Murray A. Comparison of magnetocardiography and electrocardiography: a study of automatic measurement of dispersion of ventricular repolarization. Europace. 2006;8(10): 887-893 (Pubitemid 44550620)
79. Temple JD. Fetal magnetocardiography-an exciting new technique for the diagnosis and management of fetal arrhythmias. Pediatric Cardiology Today. 2005 Jan;3(1):1-3.
80. Hayes MJ, Smith PR. A new method for pulse oximetry possessing inherent insensitivity to artifact. IEEE Trans Biomed Eng. 2001 April;48(4):452-461
81. Salamalekis E, Thomopoulos P, Giannaris D, Salloum I, Vasios G, Prentza A, Koutsouris D. Computerised intrapartum diagnosis of fetal hypoxia based on fetal heart rate monitoring and fetal pulse oximetry recordings utilizing wavelet analysis and neural networks. BJOG. 2002 October;109(10):1137-1142
82. Nioka S, Izzetoglu M, Mawn T, Nijland MJ, Boas D, Chance B. Fetal transabdominal pulse oximeter studies using a hypoxic sheep model. J Matern Fetal Neonatal Med. 2005 June;17(6):393-399 (Pubitemid 40992311)
83. Salamalekis E, Siristatidis C, Vasios G, Saloum J, Giannaris D, Chrelias C, Prentza A, Koutsouris D. Fetal pulse oximetry and wavelet analysis of the fetal heart rate in the evaluation of abnormal cardiotocography tracings. J Obstet Gynaecol Res. 2006 April;32(2): 135-139
84. Garite TJ, Dildy GA, McNamara H. Fetal pulse oximetry reduced the rate of cesarean delivery for nonreassuring fetal heart rate patterns by 50%. Evidence-based Obstetrics and Gynaecology. 2001 December;3(4):188-189
85. Salamalekis E, Bakas P, Saloum I, Vitoratos N, Creatsas G. Severe Variable decelerations and fetal pulse oximetry during the second stage of labor. Fetal Diagn Ther. 2005;20:31-34 (Pubitemid 40082182)
86. Tomialowicz M, Zimmer M, Pomorski M, Fuchs T. Biophysical and biochemical assessment of fetal perinatal hypoxia. Adv Clin Exp Med. 2007;16(2):249-256 (Pubitemid 46900039)
87. Csitári IK, Pasztuhov A, László A. The reliability of fetal pulse oximetry: the effect of fetal oxygen saturation below 30% on perinatal outcome. Eur J Obstet Gynecol Reprod Biol. 2008 Feb;136(2):160-164 (Pubitemid 351173454)
88. Vasios G, Prentza A, Sifakis E, Thomopoulos P, Salamalekis E, Koutsouris D. Prediction of fetal acidemia based on the very low frequency components of the fetal heart rate and fetal pulse oximetry recordings during labor. The International Special Topic Conference on Information Technology in Biomedicine, Greece. 2006 Oct 26-28
89. Colley N, Abraham NG, Fayers P, Talbert DG, Davies WL, Southall DP. The fetal phonogram: a measure of fetal activity. Lancet. 1986 Apr;26(1):931-935
90. McDonnell JTE. Knowledge-based interpretation of foetal phonocardiographic signals. Radar and Signal Processing, IEE Proceedings F. 1990 Oct;137(5):311-318
91. Goovaerts HG, Rompelman O, Van Geijn HP. A transducer for detection of fetal breathing movements. IEEE Trans Biomed Eng. 1989 Apr;36(4):471-478
92. Zhang X, Durand L, Senhadji L, Lee HC, Coatrieux J. Time-frequency scaling transformation of the phonocardiogram based of the matching pursuit method. IEEE Trans Biomed Eng. 1998;45(8):972-979 (Pubitemid 28354472)
93. Chen J, Phua K, Song Y, Shue L. A portable phonocardiographic fetal heart rate monitor. Proceedings of the International Symposium of the IEEE on Circuits and Systems. 2006 May 21-24.
94. Mittra AK, Shukla A, Zadgaonkar AS. System simulation and comparative analysis of foetal heart sound de-noising techniques for advanced phonocardiography. Intl J Biomed Eng Tech. 2007;1(1):73-85.
95. Nagel J. New diagnostic and technical aspects of fetal phonocardiography. Eur J Obstet Gynecol Reprod Biol. 1986;23:295-303. (Pubitemid 17229997)
96. Yin X, Han P, Zhang J, Zhang F, N. Wang Limitations: Application of wavelet transform in signal de-noising. Proceedings of the Second International Conference of the IEEE on Machine Learning and Cybernetics. 2003;1:436-444
97. Daubechies I. Ten lectures on wavelets. Society for Industrial and Applied Mathematics (SIAM). New York: SIAM, 1992.
98. Varady P, Wildt L, Benyo Z, Heim A. An advanced method in fetal phonocardiography. Comput Methods Programs Biomed. 2003;71:283-296
99. Chourasia VS, Mittra AK. Passive acoustic signal acquisition system for non-invasive fetal heart sound monitoring applications. Internet J Med Tech. 2009;5(1).
100. Degang S, Kai Y, Haifeng T. Application of wavelet analysis in acoustic signal processing. The Eighth International Conference on Electronic Measurement and Instruments. J Elect Meas Instrument. Xi'an, China, 2007;772-775
101. Misiti M, Misiti Y, Oppenheim G, Poggi J. MATLAB wavlet toolbox user's guide. Natick, MA: The MathWorks, Inc., 1997.
102. Chourasia VS, Mittra AK. De-noising of fetal phonocardiographic signals using wavelets. Proceedings of National Conference on Recent Innovative Techniques in Engineering & Technology, Jabalpur. 2008 Oct 4-5;59-63.
103. Chourasia VS, Mittra AK. Selection of mother wavelet and de-noising algorithm for fetal phonocardiographic signals. J Med Eng Technol. 2009;33(6):442-448.
104. Song Y, Xie W, Chen JF, Phua KS. Passive acoustic maternal abdominal fetal heart rate monitoring using wavelet transform. Comput Cardiol. 2006 Sep 17-20;33:581-584
105. Kovacs F, Horvath Cs, Torok M, Hosszu G. Long-term phonocardiographic fetal home monitoring for telemedicine systems. 27th Annual International Conference of the IEEE on Engineering in Medicine and Biology Society. 2005; pp. 3946-3949 (Pubitemid 46229799)