Under which circumstances should a nurse contact the physician to postpone intravenous moderate sedation?

Question

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Verify that the patient has not ingested food or fluids,except for oral medications,for at least 4 hours.Verify specific agency requirements.Because a risk of moderate sedation is patient loss of airway protection,an empty stomach reduces the risk of aspiration.
A history of substance abuse is not a contraindication to the procedure,although it usually requires dose adjustment of the sedative.With no history of latex allergy,allergic reactions are not a concern.An understanding of the procedure implies that consent was informed.

Under Which Circumstances Should a Nurse Contact the Physician to Postpone