Matthew Holzner

Dr. Matthew Holzner

orcid

Research Focus & Metrics

Academic Career Length

13Years (2014-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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3 May 2024 in Transplantation Direct
Verified
Journal Article
Open access
JTJulia Torabi
Julia Torabi
RTRachel Ba Todd
Rachel Ba Todd
Leonie van LeeuwenLeonie van Leeuwen
Leonie van Leeuwen
YBYuki Bekki
Yuki Bekki
MHMatthew Holzner
Matthew Holzner
MAM. Zeeshan Akhtar
M. Zeeshan Akhtar
Background: Organ shortage remains a major challenge for the field of transplantation. Maximizing utilization and minimizing discard of available organs is crucial to reduce waitlist times. Our aim was to investigate the landscape of liver recovery, discard over the past decade in the United States, and identify areas to reduce organ discard. Methods: This study used the Scientific Registry of Transplant Recipients United Network for Organ Sharing database to analyze the rates and associated reasons of discarded organs from 2010 to 2021. All deceased donors were evaluated, and data were analyzed by organ type, year, and region. Organ disposition was analyzed by year and region. Donor demographics and liver biopsy data were also analyzed. Results: The volume of liver transplantation increased steadily, with a 44% increase from 2010 to 2021. Donation after circulatory death transplantation increased by 239%, comprising 10.6% of transplants in 2021, yet discard rates remained high at 30% for this donor subset. For all donor types, the liver discard rate has remained stable around 10% despite a 74% increase in available donors. Seventy percent of liver discards were attributed to organ factors, with biopsy findings accounting for 40% of all discards. Of livers that were biopsied, 70% had macrosteatosis of <30%. Conclusions: Analysis of trends in transplantation and discard allow for identifying areas of underutilization. Donation after circulatory death livers have expanded the pool of transplanted livers but remain discarded at high rates. Significant differences remain in discard rates between geographic regions. We identify several areas to lower the discard rates. The expanding role of machine perfusion may allow for utilization of previously discarded organs.

30 April 2020 in Liver Transplantation
Verified
Journal Article
Closed access
PDF file
MHMatthew Holzner
Matthew Holzner
PTParissa Tabrizian
Parissa Tabrizian
FPFatemeh P. Parvin‐Nejad
Fatemeh P. Parvin‐Nejad
KFKezhen Fei
Kezhen Fei
GGGanesh Gunasekaran
Ganesh Gunasekaran
MSMyron E. Schwartz
Myron E. Schwartz

28 March 2024 in Transplantology
Verified
Journal Article
Open access
PDF file
CMCeilidh McKenney
Ceilidh McKenney
JTJulia Torabi
Julia Torabi
RTRachel Todd
Rachel Todd
MAM. Zeeshan Akhtar
M. Zeeshan Akhtar
FTFasika M. Tedla
Fasika M. Tedla
Leonie van LeeuwenLeonie van Leeuwen
Leonie van Leeuwen
Kidney transplantation is a life-saving intervention for end-stage renal disease; yet, the persistent gap between organ demand and supply remains a significant challenge. This paper explores the escalating discard rates of deceased donor kidneys in the United States to assess trends, discard reasons, demographical differences, and preservation techniques. Data from the Scientific Registry of Transplant Recipients from 2010 to 2021 was analyzed using chi-squared tests for trend significance and logistic regression to estimate odds ratios for kidney discard. Over the last decade, discard rates have risen to 25% in 2021. Most discarded kidneys came from extended criteria donor (ECD) donors and elevated kidney donor profile index (KDPI) scores. Kidney biopsy status was a significant factor and predictor of discard. Discard rates varied greatly between Organ Procurement and Transplantation Network regions. Of reasons for discard, “no recipient located” reached a high of 60%. Additionally, there has been a twofold increase in hypothermic machine perfusion (HMP) since 2010, with transportation difficulties being the main reason for the discard of perfused kidneys. Our findings suggest a need to recalibrate organ utilization strategies, optimize the use of lower-quality kidneys through advanced preservation methods, and address the evolving landscape of organ allocation policies to reduce kidney discard rates.

11 June 2019 in Progress in Transplantation
Verified
Journal Article
Closed access
PDF file
PTParissa Tabrizian
Parissa Tabrizian
MGMassimo Giacca
Massimo Giacca
JPJake Prigoff
Jake Prigoff
BTBenjamin Tran
Benjamin Tran
MHMatthew Holzner
Matthew Holzner
RSRon Shapiro
Ron Shapiro
The benefit and short-term safety of ketorolac have been established in previous studies however, the risk of bleeding and long-term renal impairment in patients undergoing donor nephrectomy remain unclear. We report our experience at a high-volume transplant center. Between January 1996 and January 2014, 862 consecutive patients underwent laparoscopic donor nephrectomy. Exclusion criteria included nonsteroidal anti-inflammatory drug allergy, asthma, bleeding disorders, long-term opioid use, intraoperative blood loss >700 mL, peptic ulcer disease, bleeding diathesis, and baseline creatinine greater than 1.9 mg/dL. Intravenous ketorolac was administered within 30 minutes following the surgical procedure at a dose of 15 to 30 mg every 6 hours. Patients were categorized into 2 groups according to the administration of ketorolac after surgery. Differences between the groups were analyzed. Primary outcomes were changes in serum creatinine and hemoglobin levels. Poor outcome was defined as postsurgical complications. During this time, 469 (55.3%) received ketorolac. The mean donor age was 39 years, and 360 (42.5%) were male. Left kidneys were procured in 82%. Operative time averaged 210 minutes and warm ischemia time117 seconds. Baseline demographic and operative outcomes were comparable in both groups. No statistically significant differences were found between the ketorolac group and the nonketorolac group in preoperative and postoperative hemoglobin levels and serum creatinine at 1 week, 1 year, and 5 years (P = .6). Ketorolac use was not associated with increased perioperative morbidity (P = NS). The use of intravenous ketorolac in patients undergoing donor nephrectomy was not associated with an increased risk of bleeding or renal impairment. The benefit and short-term safety of ketorolac have been established in previous studies however, the risk of bleeding and long-term renal impairment in patients undergoing donor nephrectomy remain unclear. We report our experience at a high-volume transplant center. Between January 1996 and January 2014, 862 consecutive patients underwent laparoscopic donor nephrectomy. Exclusion criteria included nonsteroidal anti-inflammatory drug allergy, asthma, bleeding disorders, long-term opioid use, intraoperative blood loss >700 mL, peptic ulcer disease, bleeding diathesis, and baseline creatinine greater than 1.9 mg/dL. Intravenous ketorolac was administered within 30 minutes following the surgical procedure at a dose of 15 to 30 mg every 6 hours. Patients were categorized into 2 groups according to the administration of ketorolac after surgery. Differences between the groups were analyzed. Primary outcomes were changes in serum creatinine and hemoglobin levels. Poor outcome was defined as postsurgical complications. During this time, 469 (55.3%) received ketorolac. The mean donor age was 39 years, and 360 (42.5%) were male. Left kidneys were procured in 82%. Operative time averaged 210 minutes and warm ischemia time117 seconds. Baseline demographic and operative outcomes were comparable in both groups. No statistically significant differences were found between the ketorolac group and the nonketorolac group in preoperative and postoperative hemoglobin levels and serum creatinine at 1 week, 1 year, and 5 years (P = .6). Ketorolac use was not associated with increased perioperative morbidity (P = NS). The use of intravenous ketorolac in patients undergoing donor nephrectomy was not associated with an increased risk of bleeding or renal impairment.

1 December 2018 in Transplantation Proceedings
Verified
Journal Article
Closed access
MHMatthew Holzner
Matthew Holzner
SDS. DeMaria
S. DeMaria
BHB. Haydel
B. Haydel
NSN. Smith
N. Smith
DFD. Flaherty
D. Flaherty
SFS. Florman
S. Florman