The purpose of this research is to study the effect of cannabis (marijuana) on gastric (stomach) emptying before surgery. The study will include people who use cannabis (study group) and people who do not use cannabis (control group).
About 108 people will take part in this study (54 in the study group and 54 in the control group). Subjects will have an ultrasound of the abdomen before their scheduled surgery. The ultrasound will determine how much fluid remains in the abdomen. Researchers will also review subjects' medical records and will include: age, body mass index, history of cannabis use including how often and how consumed, reason for surgery, and length of time without eating before surgery.
Study Type
OBSERVATIONAL
Gastric content volume
Gastric content volume as assessed by ultrasound prior to surgery
Time frame: pre-operative
Frequency of cannabis use
number of times per week patient uses cannabis
Time frame: 3 months prior to surgery
Cannabis use (chronic yes or no)
Yes or No for chronic cannabis use
Time frame: 1 year prior to surgery
Route of cannabis consumption
Categories of how cannabis is consumed (smoke, vape, other)
Time frame: 3 months prior to surgery
Time since last food; Nil per os (NPO) time
Length of time patient had no food prior to surgery
Time frame: 24 hours prior to surgery
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