Ketamine does not increase intracranial pressure compared with opioids: meta-analysis of randomized controlled trials. (Petrillo)

Wang X, Ding X, Tong Y, Zong J, Zhao X, Ren H, Li Q. Ketamine does not increase intracranial pressure compared with opioids: meta-analysis of randomized controlled trials. J Anesth. 2014 May 24. [Epub ahead of print]

BACKGROUND: Ketamine is traditionally avoided in sedation management of patients with risk of intracranial hypertension. However, results from many clinical trials contradict this concern. We critically analyzed the published data of the effects of ketamine on intracranial pressure (ICP) and other cerebral hemodynamics to determine whether ketamine was safe for patients with hemodynamic instability and brain injuries.

METHODS: We systematically searched the online databases of PubMed, Medline, Embase, Current Controlled Trials, and Cochrane Central (last search performed on January 15, 2014). Trial characteristics and outcomes were independently extracted by two assessors (Xin Wang, Xibing Ding). For continuous data, mean differences (MD) were formulated. If the P value of the chi-square test was >0.10 or I 2 <50 %, a fixed-effects model was used; otherwise, the random effects model was adopted.

RESULTS: Five trials (n = 198) met the inclusion criteria. Using ICP levels within the first 24 h of ketamine administration as the main outcome, the use of ketamine leads to the same ICP levels as opioids [MD = 1.94; 95 % confidence interval (95 % CI), -2.35, 6.23; P = 0.38]. There were no significant differences in mean arterial pressure values between the two groups (MD = 0.99; 95 % CI, -2.24, 4.22; P = 0.55). Ketamine administration was also comparable with opioids in the maintenance of cerebral perfusion pressure (MD = -1.07; 95 % CI, -7.95, 5.8; P = 0.76).

CONCLUSIONS: The results of this study suggest that ketamine does not increase ICP compared with opioids. Ketamine provides good maintenance of hemodynamic status. Clinical application of ketamine should not be discouraged on the basis of ICP-related concerns.

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Comparison of low-dose ketamine to midazolam for sedation during pediatric urodynamic study. (Pham)

Paediatr Anaesth. 2013 May;23(5):415-21. PMID: 23061785

INTRODUCTION: Aim of sedation during pediatric urodynamic studies (UDS) is a calm and cooperative child while not affecting measurements. We compared the effectiveness of midazolam to low-dose ketamine infusion for sedation and their impact on urodynamics.

MATERIALS AND METHODS: ASA-I children undergoing UDS were randomly assigned to group K (ketamine) loading dose (0.25 mg·kg(-1) ) followed by infusion of 10-20 μg·kg(-1) ·min(-1) or group M (midazolam) loading dose of (0.02 mg·kg(-1) ) followed by 1-2 μg·kg(-1) ·min(-1) . The sedation scores and reactivity to catheterization were monitored by Children Hospital of Wisconsin Sedation Scale and Frankl Behavior Rating Scale, respectively. The UDS included two-channel filling cystometry in supine position followed by a free uroflowmetry in sitting position. The UDS was performed and interpreted in accordance with good urodynamic practice guidelines of International Continence Society (2002).

RESULTS: A total of 34 children were enrolled. Group K children (n = 17) attained sedation earlier 6.80 (±3.36) min vs. 9.40 (±2.82) min; (P = 0.03) than group M (n = 17) and also recovered earlier 11.60 (±3.13) min vs. 19.67 (±5.49) min (P = 0.01). Reactivity scores during urinary and rectal catheterization were lower in group K (P = 0.03 and 0.01), respectively. Historical UDS data of 21 participants were available for comparison with effect of medication. None of the study drugs affected UDS parameters significantly.

CONCLUSIONS: Midazolam or low-dose ketamine provide satisfactory sedation during pediatric UDS without impacting urodynamic values.

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