Biomedical subjects

Nikoleta Koutlaki

Publications and source records attributed to Nikoleta Koutlaki.

4 recordsLinked to original sources

PubMed2006

Differentiation of myomas by means of biomagnetic and doppler findings.

AIM: To elucidate the hemodynamics of the uterine artery myomas by use of Doppler ultrasound and biomagnetic measurements. METHOD: Twenty-four women were included in the study. Sixteen of them were characterised with large myomas whereas 8 of them with small ones. Biomagnetic signals of uterine arteries myomas were recorded and analyzed with Fourier analysis. The biomagnetic signals were distributed according to spectral amplitudes as high (140-300 ft/ radicalHz), low (50-110 ft/ radicalHz) and borderline (111-139 ft/ radicalHz). Uterine artery waveform measurements were evaluated by use of Pulsatility Index (PI) (normal value PI < 1.45). RESULTS: There was a statistically significant difference between large and small myomas concerning the waveform amplitudes (P < 0.0005) and the PI index (P < 0.0005). Specifically, we noticed high biomagnetic amplitudes in most large myomas (93.75 %) and low biomagnetic amplitudes in most small ones (87.5 %). CONCLUSION: It is suggested that the biomagnetic recordings of uterine artery myomas could be a valuable modality in the estimation of the circulation of blood cells justifying the findings of Doppler velocimetry examination.

Journal Article↗

PubMed2006

Nonlinear analysis of biomagnetic signals recorded from uterine myomas.

OBJECTIVE: To determine if there is any non-linearity in the biomagnetic recordings of uterine myomas and to find any differences that may be present in the mechanisms underlying their signal dynamics. METHODS: Twenty-four women were included in the study. Sixteen of them were characterised with large myomas and 8 with small ones. Uterine artery waveform measurements were evaluated by use of Pulsatility Index (PI) (normal value PI<1.45). RESULTS: Applying nonlinear analysis to the biomagnetic signals of the uterine myomas, we observed a clear saturation value for the group of large ones (mean = 11.35 +/- 1.49) and no saturation for the small ones. CONCLUSION: The comparison of the saturation values in the biomagnetic recordings of large and small myomas may be a valuable tool in the evaluation of functional changes in their dynamic behavior.

Journal Article↗

PubMed2004

Cytologic differential diagnostic problems in ulcerative cervicitis.

OBJECTIVE: To improve the detection rates in the determination of signs consistent with ulcerative cervicitis against signs of intraepithelial neoplasia, in PAP smears. STUDY DESIGN: We investigated the frequency of establishing a diagnosis of a simple ulcerative cervicitis by histology in a cohort of 58 females with cervical cytology suggestive of intraepithelial neoplasia. RESULTS: There was found a detection rate of 81.58% in the determination of ulcerative cervicitis by cytology and a rate of 100% in the determination of HPV-infection, CIN1, CIN2 and CIN3 respectively. There was no statistically significant difference between cytology and histology in the diagnosis of ultracerative cervicitis (p>0.5, chi-square). CONCLUSIONS: There is an overestimation of the cytological signs in the diagnosis of ulcerative cervicitis 18.42%). There is also an excellent agreement in the diagnosis of HPV-infection and CIN grades (100%) between cytology and histology, discordant with the literature (2.4%-71%).

Adolescent↗

PubMed2002

Fetal magnetoencephalography in intrauterine growth retarded pregnancies.

OBJECTIVE: To investigate the fetal brain activity in pre-eclamptic and normal pregnancies. Biomagnetic measurements were performed by means of a superconducting quantum interference device (SQUID) in an electrically shielded room of low magnetic noise. METHODS: The study population included 28 pre-eclamptic (34-37 weeks' gestation) and 19 normal pregnancies (34-37 weeks' gestation). The pre-eclamptic group consisted of 11 cases with birth weight below the 10th percentile (1969 +/- 129 g) and 17 cases above the 10th percentile (2496 +/- 257 g). Biomagnetic signals (waveforms) recorded from fetal brains were expressed in terms of magnetic power spectral amplitudes. RESULTS: The total corresponding spectral amplitudes in the frequency range 2-7 Hz were high (719 +/- 69 Ft/ radical Hz in neonates <10th percentile and 537 +/- 105 Ft/ radical Hz in neonates >10th percentile) in most (82%) pre-eclamptic pregnancies and low (382 +/- 35 Ft/ radical Hz) in most normal pregnancies (95%). The difference between normal and all pre-eclamptic pregnancies was highly significant (Student's t-test: p < 0.0001). Comparing the two groups of pre-eclampsia we found also a highly significant difference (Student's t-test: p < 0.0001). CONCLUSION: Biomagnetic measurements of fetal brain activity could be useful in the assessment of fetal central nervous system development.

Adult↗