Racemic ketamine in adult head injury patients: use in endotracheal suctioning.

Abstract

INTRODUCTION:

Endotracheal suctioning (ETS) is essential for patient care in an ICU but may represent a cause of cerebral secondary injury. Ketamine has been historically contraindicated for its use in head injury patients, since an increase of intracranial pressure (ICP) was reported; nevertheless, its use was recently suggested in neurosurgical patients. In this prospective observational study we investigated the effect of ETS on ICP, cerebral perfusion pressure (CPP), jugular oxygen saturation (SjO2) and cerebral blood flow velocity (mVMCA) before and after the administration of ketamine.

METHODS:

In the control phase, ETS was performed on patients sedated with propofol and remifentanil in continuous infusion. If a cough was present, patients were assigned to the intervention phase, and 100 γ/kg/min of racemic ketamine for 10 minutes was added before ETS.

RESULTS:

In the control group ETS stimulated the cough reflex, with a median cough score of 2 (interquartile range (IQR) 1 to 2). Furthermore, it caused an increase in mean arterial pressure (MAP) (from 89.0 ± 11.6 to 96.4 ± 13.1 mmHg; P <0.001), ICP (from 11.0 ± 6.7 to 18.5 ± 8.9 mmHg; P <0.001), SjO2 (from 82.3 ± 7.5 to 89.1 ± 5.4; P = 0.01) and mVMCA (from 76.8 ± 20.4 to 90.2 ± 30.2 cm/sec; P = 0.04). CPP did not vary with ETS. In the intervention group, no significant variation of MAP, CPP, mVMCA, and SjO2 were observed in any step; after ETS, ICP increased if compared with baseline (15.1 ± 9.4 vs. 11.0 ± 6.4 mmHg; P <0.05). Cough score was significantly reduced in comparison with controls (P <0.0001).

CONCLUSIONS:

Ketamine did not induce any significant variation in cerebral and systemic parameters. After ETS, it maintained cerebral hemodynamics without changes in CPP, mVMCA and SjO2, and prevented cough reflex. Nevertheless, ketamine was not completely effective when used to control ICP increase after administration of 100 γ/kg/min for 10 minutes.

• Authors: Anselmo Caricato, Alessandra Tersali, Sara Pitoni, Chiara De Waure, Claudio Sandroni, Maria Grazia Bocci, Maria Giuseppina Annetta, Mariano Alberto Pennisi, Massimo Antonelli
• Journal: Critical care (London, England) (Crit Care) Vol. 17 Issue 6 Pg. R267 (Nov 08 2013) ISSN: 1466-609X [Electronic] England
• PMID: 24209387 (Publication Type: Journal Article)

Chemical References

• Anesthetics, Dissociative
• Hypnotics and Sedatives
• Piperidines
• Ketamine
• Remifentanil
• Propofol

Topics

• Adult
• Anesthetics, Dissociative (adverse effects, therapeutic use)
• Craniocerebral Trauma (complications, therapy)
• Hemodynamics (drug effects)
• Humans
• Hypnotics and Sedatives (administration & dosage, therapeutic use)
• Infusion Pumps
• Intracranial Pressure (drug effects)
• Italy
• Ketamine (adverse effects, therapeutic use)
• Piperidines (administration & dosage, therapeutic use)
• Propofol (administration & dosage, therapeutic use)
• Remifentanil
• Suction (adverse effects, methods)
• Trachea (drug effects)