Tohma, Yusuf Aytaç

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Y., Tohma
T.,Yusuf Aytaç
Y.A.Tohma
Aytac Tohma Y.
Tohma Y.
Yusuf Aytaç, Tohma
Y. A. Tohma
T., Yusuf Aytaç
Tohma, Y. Aytaç
Aytac Tohma, Yusuf
Tohma, Yusuf A.
Tohma, Yusuf Aytac
Tohma, Yusuf Aytaç
Y.,Tohma
Yusuf Aytac, Tohma
T.,Yusuf Aytac
Tohma, Y. A.
T., Yusuf Aytac
Tohma,Y.A.
Job Title
Doçent Doktor
Email Address
aytac.tohma@atilim.edu.tr
Main Affiliation
Department Of Medical Services and Techniques
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Scopus Author ID
55834891800
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Scholarly Output

2

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2

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    Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Individualized Luteal Phase Support in Frozen-Thawed Embryo Transfer After Intramuscular Progesterone Administration Might Rectify Live Birth Rate
    (Frontiers Media Sa, 2024) Boynukalin, Fazilet Kubra; Tohma, Yusuf Aytac; Yarkiner, Zalihe; Gultomruk, Meral; Bozdag, Gurkan; Ozkavukcu, Sinan; Demir, Berfu
    Background: The serum P concentrations are suggested to have an impact on pregnancy outcome. However there is no consensus about the optimal progesterone cut-off during the luteal phase. Few studies evaluated the effectiveness of a "rescue protocol" for low serum P concentrations and most of these studies used vaginal progesterone administration. There is paucity of data on the effectiveness of rescue protocol using intramuscular progesterone (IM-P) in frozen-thawed embryo transfer (FET). Methods: This study is a retrospective cohort study included 637 single or double blastocyst FETs with artificially prepared endometrium receiving 100 mg IM progesterone (P) after incremental estrogen treatment. Serum P concentrations were evaluated using blood samples obtained 117-119 hours after the first IM-P administration and 21 +/- 2 hours after the last IM-P administration. Patients with serum P concentrations <20.6 ng/ml on the ET day were administrated 400 mg vaginal progesterone for rescue. Results: Demographic and cycle characteristics were similar between patients receiving rescue vaginal P (embryo transfer (ET)-day P concentration < 20.6 ng/ml) and patients who did not need rescue vaginal P (ET-day P concentration >= 20.6 ng/ml). Clinical pregnancy, miscarriage, and live birth rates were similar between two groups: 52.9%(45/85) vs 59.6%(326/552), p=0.287; 11.1%(5/45) vs 14.1%(46/326), p=0.583; and 47.1%(40/85) vs 50.7%(280/552), p=0.526, respectively. Logistic regression analysis revealed that the female age (p = 0.008, OR=0.942, 95% CI = 0.902-0.984) and embryo quality (ref: good quality for moderate: p=0.02, OR=0.469, 95% CI =0.269-0.760; for poor: p=0.013, OR= 0.269, 95% CI = 0.092-0.757) were independent variables for live birth. Following rescue protocol implementation, ET-day P concentration was not a significant predictor of live birth. Conclusions: Rescue vaginal P administration for low ET day serum P concentrations following IM-P yields comparable live birth rates.
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    Article
    Citation - Scopus: 0
    High Serum Progesterone Levels on the Day of Embryo Transfer in Patients Undergoing Artificial Frozen-Thawed Blastocyst Transfer: Is There a Ceiling Effect?;
    (Turkish Society of Obstetrics and Gynecology, 2024) Tohma,Y.A.; Demir,B.; Dundar,B.; Boynukalin,F.K.; Findikli,N.; Bahceci,M.; Bozdag,G.
    Objective: To evaluate the potential ceiling effect of high serum progesterone levels on the day of embryo transfer for pregnancy outcomes in patients undergoing artificial frozen-thawed blastocyst transfer (FET) cycles. Materials and Methods: This retrospective cohort study included 595 patients who underwent artificial FET cycles. We evaluated progesterone levels and found that 40.6 ng/mL corresponded to the 90th percentile and 23.9 ng/mL corresponded to the 50th percentile. Based on these findings, we categorized progesterone levels as <20 ng/mL (n=220, 37.0%), 20-40 ng/mL (n=312, 52.4%), and ≥40 ng/mL (n=63, 10.6%). The primary outcome measures were the clinical pregnancy rate (CPR) and live birth rate (LBR). Results: Blastocyst morphology grades, including expansion, trophectoderm, and inner cell mass grades, were significantly associated with clinical pregnancy (p<0.001 for all). Progesterone levels between 20 and 40 ng/mL were associated with higher CPR (p=0.043). In the multivariate analysis, only blastocyst expansion and inner cell mass grades were independently and significantly associated with CPR [p=0.011, odds ratio (OR)=1.6, (confidence interval) CI 95%=1.13-2.39, and p=0.007, OR=1.65, CI 95%=1.14-2.39, respectively]. The progesterone level and trophectoderm grade were not statistically significant. Regarding LBR, only blastocyst expansion grades 4 and trophectoderm grades A or B were significantly associated. Conclusion: Based on these data, we speculate that if serum progesterone levels exceed 40 ng/mL on the day of embryo transfer in patients undergoing artificial FET cycles, there is no need to reduce the progesterone dose. © 2024 The Author.