LETTERSTOTHEEDITOR 311
References
1.Nuri Deniz M,Erakgün A, SertözN, etal. Theeffectof head rotationonintraocularpressureinproneposition:arandomized trial.RevBrasAnestesiol.2013;63:209---12.
2.JadadAR, MooreRA,Carroll D,et al.Assessingthequalityof reportsofrandomizedclinicaltrials:isblindingnecessary? Con-trolClinTrials.1996;17:1---12.
3.WalickKS,KraghJEJr,Ward JA,etal.Changesinintraocular pressure duetosurgicalpositioningstudyingpotentialriskfor postoperativevisionloss.Spine.2007;32:2591---5.
FabianoTimbóBarbosaa,∗,
TatianaRosaBezerraWanderleyBarbosaa,
RafaelMartinsdaCunhab
aCentroUniversitárioUnisebInterativo,Maceió,AL,Brazil
bHospitalUnimed,Maceió,Maceió,AL,Brazil
∗Correspondingauthor.
E-mail:[email protected](F.T.Barbosa). Availableonline29April2015
http://dx.doi.org/10.1016/j.bjane.2014.02.019
A
question
about
ropivacaine
for
unilateral
spinal
anesthesia:
hypobaric
solution
Uma
questão
sobre
ropivacaína
para
raquianestesia
unilateral:
soluc
¸ão
hipobárica
DearEditor,
Iamadoctorfromdepartmentofanesthesiology,Shanghai Sixth People’s hospital, Shanghai Jiao Tong University, Shanghai, China.I have many interests in ropivacainefor unilateral spinal anesthesia: hypobaricsolution. SoIhave readyourliteraturetitled‘‘Ropivacaineforunilateralspinal anesthesia; hyperbaric or hypobaric?’’1 In this article, it
wasmentionedthat‘‘groupHypo(n=30)received11.25mg ofropivacaine(7.5mgmL−1)+2mLofdistilledwater
(den-sityatroomtemperaturewas0.997)’’.Becauseropivacaine (7.5mgmL−1) is isobaric solution and density of distilled
water is 1, whythe density of mixed solutionwas 0.997? Imadethesemixedsolutiontosurveythedensity,andthe densitywas1.006.Pleasetellme theanswer, andtellme
yourwaytomakethemixedsolutionandsurveythedensity. Thankyouverymuch.
Conflicts
of
interest
Theauthordeclaresnoconflictsofinterest.
Reference
1.CantürkM, KılcıO, OrnekD,et al.Ropivacainefor unilateral spinalanesthesia;hyperbaricorhypobaric?RevBrasAnestesiol. 2012;62:298---311.
Da-QiangZhao
DepartmentofAnesthesiology,ShanghaiJiaotong UniversityAffiliatedSixthPeople’sHospital,Shanghai, China
E-mail:[email protected](D.Zhao). Availableonline11October2014
