Daniel J Kaser

Harvard Medical School, Boston, Massachusetts, United States

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Publications (12)30.88 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To determine whether day 3 FSH and E2 levels at the upper limits of normal affect live-birth rates and treatment trajectory in a conventional versus "fast track" treatment program for IVF.
    Fertility and sterility. 09/2014;
  • Daniel J Kaser, Catherine Racowsky
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    ABSTRACT: Time-lapse monitoring (TLM) has emerged as a novel technology to perform semi-quantitative evaluation of embryo morphology and developmental kinetics in assisted reproduction. While this method has already been introduced into clinical practice in many laboratories, it is unclear whether it adds value to conventional morphology. Most studies only report blastocyst formation as the primary end-point. The aim of this systematic review is to provide a critical evaluation of the available studies that report clinical outcomes following embryo selection with TLM.
    Human Reproduction Update 06/2014; · 8.85 Impact Factor
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    ABSTRACT: To evaluate the association between serum progesterone (P) levels on the day of embryo transfer (ET) and pregnancy rates in fresh donor IVF/ICSI cycles. Fresh donor cycles with day 3 ET from 10/2007 to 8/2012 were included (n = 229). Most cycles (93 %) were programmed with a gonadotropin releasing hormone (GnRH) agonist; oral, vaginal or transdermal estradiol was used for endometrial priming, and intramuscular P was used for luteal support (50-100 mg/day). Recipient P levels were measured at ET, and P dose was increased by 50-100 % if <20 ng/mL per clinic practice. The main outcome measure was rate of live birth (> = 24 weeks gestational age). Generalized estimating equations were used to account for multiple cycles from the same recipient, adjusted a priori for recipient and donor age. Mean recipient serum P at ET was 25.5 ± 10.1 ng/mL. Recipients with P < 20 ng/mL at ET, despite P dose increases after ET, were less likely to achieve clinical pregnancy (RR = 0.75, 95 % CI = 0.60-0.94, p = 0.01) and live birth (RR = 0.77, 95 % CI = 0.60-0.98, p = 0.04), as compared to those with P ≥ 20 ng/mL. P dose increases were more often required in overweight and obese recipients. Serum P levels on the day of ET in fresh donor IVF/ICSI cycles were positively correlated with clinical pregnancy and live birth rates. An increase in P dose after ET was insufficient to rescue pregnancy rates. Overweight and obese recipients may require higher initial doses of P supplementation. Future research is needed to define optimal serum P at ET and the interventions to achieve this target.
    Journal of Assisted Reproduction and Genetics 03/2014; · 1.82 Impact Factor
  • Daniel J Kaser, Elizabeth S Ginsburg
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    ABSTRACT: Since report of the first live birth following preimplantation genetic screening (PGS) in 1995, the procedure and available technologies for aneuploidy detection have rapidly evolved. Through these efforts, the biology of meiotic and mitotic segregation errors has been partially elucidated. A process that began with polar body biopsy and four-color fluorescence in situ hybridization to detect copy number in a limited number of chromosomes is now hardly recognizable: current molecular methods permit high-density screening of the entire human genome for copy number variants, structural rearrangements, microdeletions, and polyploids to a resolution of 35 kilobases in less than 48 hours. Indeed, with the advent of real-time quantitative analyses of ploidy status that allow same-day trophectoderm biopsy with fresh transfer of a euploid blastocyst, the future is bright for PGS. Questions remain about how best to safely offer this technology to patients, and which patients, if any, will benefit from routine biopsy. Herein, we will review the limited available evidence for application of PGS in the general infertility population as an adjunct method to optimize live birth rates.
    Seminars in Reproductive Medicine 03/2014; 32(2):100-6. · 3.21 Impact Factor
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    ABSTRACT: To determine embryo and cycle-specific parameters associated with twin live birth in day 3 cryopreserved double embryo transfer (DET) cycles, and to propose a new prediction model for external validation. All cycles with autologous or donor cryopreserved DET of day 3 embryos from 2002 to 2011 at a single academic institution with a singleton or twin live birth were included (n = 207). Patient characteristics, post-thaw embryo morphology and freeze-thaw parameters were compared between patients with a single and twin live birth. Demographic characteristics were similar, except that patients delivering twins were younger at age of cryopreserved embryo transfer (CET), fewer were parous and more were anovulatory. Duration of embryo storage, time in culture post-thaw, endometrial thickness and use of assisted hatching were comparable. Six predictors of twin delivery were identified: patient age <35 year at CET, intact survival of the lead embryo, resumption of mitosis, 7-8 viable cells in the non-lead embryo, transfer of a lead embryo with ≥7 cells and a sum of ≥14 viable cells in the two transferred embryos. Regression modeling predicted a step-wise increase in the probability of twins with addition of each predictor; with all six present, the risk of twins was predicted to be 53 % and with none present, the risk decreased to 6 %. The six identified variables associated with twin live birth following day 3 cryopreserved DET have been applied to derive a prediction model for estimating the risk of twin delivery. External validation of the model is required prior to clinical application.
    Journal of Assisted Reproduction and Genetics 07/2013; · 1.82 Impact Factor
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    ABSTRACT: OBJECTIVE: To compare outcomes after intramuscular progesterone (IMP) or 8% Crinone vaginal gel for luteal support for day 3 cryopreserved embryo transfer (CET). DESIGN: Retrospective cohort study with multivariable analysis. SETTING: Academic medical center. PATIENT(S): All autologous and donor egg in vitro fertilization and intracytoplasmic sperm injection patients who had a day 3 CET from January 1, 2008, to April 30, 2011, with luteal support using 25-50 mg/d IMP or 8% Crinone twice daily, initiated 3 days before the CET. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): Implantation rate, clinical pregnancy, and live birth rates per CET. RESULT(S): IMP (n = 440) and Crinone (n = 298) recipients were similar for all demographic characteristics and cycle parameters assessed. Although implantation rates did not differ significantly between the two groups (Crinone vs. IMP: 19.6% vs. 30.4%), women supplemented with Crinone had significantly lower rates of clinical pregnancy (36.9% vs. 51.1%) and live birth (24.4% vs. 39.1%) compared with those on IMP. CONCLUSION(S): We observed that day 3 CET cycles with 8% Crinone luteal support had a 44% and 49% lower odds of clinical pregnancy and live birth, respectively, compared with those with IMP support. Further studies are required to identify the optimal timing and dose of 8% Crinone vaginal gel for use in CET cycles.
    Fertility and sterility 09/2012; · 3.97 Impact Factor
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    ABSTRACT: The optimal surgery for combined apical and posterior vaginal prolapse is not well defined. Our objective was to examine the anatomic and functional outcomes following sacrocolpopexy (SCP) with or without posterior colporrhaphy (PC). We retrospectively evaluated 258 women who underwent abdominal (n = 62) or laparoscopic (n = 196) SCP with or without PC. Preoperative anatomic support and standardized bowel symptoms were compared to 6-week and 1-year postoperative values, using Student's t test and Wilcoxon rank sum test, respectively. Six-week follow-up data were available for 235 of 258 (91.1 %) women, while 125 of 258 (48.4 %) women had 1-year anatomic and functional outcomes recorded. While the SCP + PC group had worse posterior descent and bowel function preoperatively, there were no significant differences in postoperative anatomic support or symptoms. Long-term pelvic floor function was similar, as measured by three validated instruments. Reduction in the proportion of women with splinting was greater in the SCP + PC group. SCP with or without PC is associated with improved posterior support and decreased obstructive and irritative bowel symptoms at 1 year in women with apical and posterior prolapse.
    International Urogynecology Journal 03/2012; 23(9):1215-20. · 2.17 Impact Factor
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    ABSTRACT: To evaluate the efficacy and tolerability of norethindrone acetate (NA) as single-agent hormonal therapy for suppression of endometriosis symptoms in adolescents and young adults. Retrospective study. Two academic medical centers. A keyword search using the query 'NA' was applied to the electronic medical records of all women treated by one gynecologist (M.R.L.) from 1992 to 2010. IRB-approved chart review was then conducted on the index records. Continuous treatment with NA (5-15 mg daily). Postoperative bleeding and pain scores; adverse effects. One hundred and ninety-four patients with surgically diagnosed endometriosis initiated NA postoperatively during the study period. Median patient age was 18.9 years. 92.2% of patients had stage 1 or 2 disease, and distribution was similar among those excluded. Median pain scores decreased from 5 at NA initiation to 0 at follow-up (P = .0001) and bleeding scores from 2 to 0, respectively (P = .001) for all stages of endometriosis. Post-NA bleeding scores were improved regardless of prior hormonal regimen, and post-NA pain scores improved in all patients except for those previously prescribed GnRH-agonist plus add-back. Most patients (55.2%) did not report any side effects. The most common adverse effect was weight gain (16.1%), with a mean increase in BMI of 1.2 ± 1.6 kg/m(2) at 12 months. NA alone is a well-tolerated, effective option to manage pain and bleeding for all stages of endometriosis. Among those on prior hormonal therapy, symptoms improved after NA initiation.
    Journal of pediatric and adolescent gynecology 12/2011; 25(2):105-8. · 0.90 Impact Factor
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    ABSTRACT: To determine the incidence of fragmented oocytes in intracytoplasmic sperm injection (ICSI) cycles, describe the developmental potential of their sibling oocytes, and define clinical outcomes from affected cycles. Case-control study. Academic medical center. All ICSI cycles from January 2006 to December 2010 (n = 2,844) were reviewed for the presence of fragmented oocytes at cumulus stripping or fertilization check (n = 93). Sibling oocytes and corresponding embryos from index cycles were compared with matched control cycles without fragmented oocytes. None. Cycle characteristics, embryo quality, and pregnancy rates per retrieval. The incidence of ICSI cycles containing at least one fragmented oocyte was 3.3% (93/2,844). Twelve patients were represented more than once in these 93 index cycles. Only the first cycles (n = 81) were included, of which 28 contained fragmented oocytes at cumulus stripping, 48 at fertilization check, and five at both. Compared with matched controls, index cycles had fewer good-quality embryos available for transfer (18.8% vs. 32.1%) and significantly lower rates of implantation (20.3% vs. 32.7%), clinical pregnancy (33.3% vs. 58.0%), and ongoing delivery (29.6% vs. 49.4%). The cumulative ongoing delivered rate was also significantly lower for index cycles (32.1% vs. 55.6%), with no difference in the percentage of cycles with cryopreserved embryos remaining at study conclusion (13.5% vs. 23.5%). Cohorts containing fragmented oocytes have decreased developmental potential. The biologic mechanisms underlying this occurrence merit further investigation, and patient counseling should reflect the possible decreased success rates associated with this aberrant developmental pattern.
    Fertility and sterility 12/2011; 97(2):338-43. · 3.97 Impact Factor
  • Fertility and Sterility 09/2011; 96(3). · 4.17 Impact Factor
  • Daniel J. Kaser, Marc R. Laufer
    Journal of Pediatric and Adolescent Gynecology. 04/2011; 24(2):e49–e50.
  • Source
    Daniel J Kaser, David E Reichman, Marc R Laufer
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    ABSTRACT: Vulvovaginal sequelae of Stevens-Johnson syndrome and toxic epidermal necrolysis are well documented in the literature, although little consensus exists about effective prevention strategies. This review summarizes the available literature and offers expert opinion about how to minimize long-term vaginal impairment from these rare but often devastating illnesses.
    Reviews in obstetrics and gynecology 01/2011; 4(2):81-5.

Publication Stats

12 Citations
30.88 Total Impact Points


  • 2011–2014
    • Harvard Medical School
      • Department of Obstetrics, Gynecology, and Reproductive Biology
      Boston, Massachusetts, United States
    • Boston Children's Hospital
      • Division of Gynecology
      Boston, MA, United States
  • 2011–2012
    • Brigham and Women's Hospital
      • Department of Medicine
      Boston, MA, United States