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Investigator decision
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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control | People who self-report that they do not use cannabis. | ||
| Cannabis | People who self-report that they use cannabis. |
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| Measure | Description | Time Frame |
|---|---|---|
| Gastric content volume | Gastric content volume as assessed by ultrasound prior to surgery | pre-operative |
| Measure | Description | Time Frame |
|---|---|---|
| Frequency of cannabis use | number of times per week patient uses cannabis | 3 months prior to surgery |
| Cannabis use (chronic yes or no) | Yes or No for chronic cannabis use |
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Inclusion Criteria:
Exclusion Criteria:
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Subjects 18 years and older with a planned surgery at one of two hospitals within the healthcare system, who are willing to state if they use or do not use cannabis
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| Name | Affiliation | Role |
|---|---|---|
| Neel Kapoor, DO | The Guthrie Clinic | Principal Investigator |
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| ID | Term |
|---|---|
| D002189 | Marijuana Abuse |
| ID | Term |
|---|---|
| D019966 | Substance-Related Disorders |
| D064419 | Chemically-Induced Disorders |
| D001523 | Mental Disorders |
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| 1 year prior to surgery |
| Route of cannabis consumption | Categories of how cannabis is consumed (smoke, vape, other) | 3 months prior to surgery |
| Time since last food; Nil per os (NPO) time | Length of time patient had no food prior to surgery | 24 hours prior to surgery |