Ketamine for Pain Management in Patients with Shock and Gastritis

Safety Profile and Dosing Recommendations

Ketamine is a reasonable choice for patients with shock due to its ability to maintain cardiovascular stability through central NMDA receptor blockade and preservation of an intact adrenal axis 1
For patients with shock, ketamine should be administered at reduced doses with careful monitoring, as it can still suppress myocardial contractility in patients whose catecholamine reserves are depleted 2
The cardiovascular effects of ketamine are generally more favorable compared to other sedatives like propofol or dexmedetomidine, which may worsen hemodynamic compromise in shock patients 2
For pain management in shock patients, use low-dose ketamine: 0.5 mg/kg IV bolus followed by 1-2 μg/kg/min infusion 3, 4
In patients with significant hemodynamic compromise, consider starting at the lower end of the dosing range and titrating carefully 2

Patients with gastritis should be monitored for nausea and vomiting, which are potential side effects of ketamine 5
Regular assessment of sedation levels and respiratory status is required, particularly in shock patients who may have altered drug metabolism 6

Ketamine provides analgesia while potentially reducing opioid requirements, which may be beneficial in patients with gastritis who are at risk for opioid-induced gastrointestinal side effects 7, 4
In a study of postabdominal surgery ICU patients, ketamine reduced morphine consumption by 22mg compared to placebo without increasing side effects 4
Ketamine should not be used in patients with uncontrolled cardiovascular disease, pregnancy, active psychosis, severe liver dysfunction, or high intracranial pressure 6
Consider co-administration with a benzodiazepine to minimize psychotropic side effects, particularly when using ketamine for more than brief periods 1, 5