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Study identifier: NCT07022951 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

The Million Anesthesia Cases Study (MACS) - a Cohort Study of Preoperative Fasting and Perioperative Outcomes

Condition: Anesthesia · Sedation · Monitored Anesthesia Care  ·  Sponsor: Massachusetts General Hospital

PhaseN/A
Planned participants1200000
Who can joinAll sexes, N/A to no upper limit
Healthy volunteersNo

About this study

Perioperative fasting has historically been viewed as a low-risk intervention. However, preliminary data indicate that perioperative loss of nutrition and fluids is likely harmful. This study intends to characterize perioperative fasting practices and their potential effects on clinical outcomes through possible effects on patient well-being (anxiety, hunger, thirst), physiology (hypovolemia, hypotension), perioperative aspiration, etc. The research team hypothesized that in addition to known adverse effects on patients' well-being, prolonged preoperative fasting adversely affects circulating blood volume-related (hypotension, decreased urine output etc.) and glucose metabolism-related (e.g., hypo/hyperglycemia) perioperative physiology. The investigators will also test for an association between the duration of preoperative fasting and the risk of perioperative pulmonary aspiration. Additional knowledge on the potential adverse effects of preoperative fasting will inform preoperative fasting policies and research interventions that are relevant to hundreds of millions of patients subjected to preoperative/preprocedural fasting worldwide each year.

This description comes directly from the study's public registry record.

Talk to the study team

Alexander Nagrebetsky, MD, MSc  ·  617-724-3292  ·  anagrebetsky@mgh.harvard.edu

Always discuss trial participation with your own doctor first.

Locations (1)

Mass General Brigham Hospital Network of secondary, tertiary, and quaternary care hospitalsBoston, Massachusetts, United StatesRecruiting

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Source record: clinicaltrials.gov/study/NCT07022951