SYSTEME INTERNATIONAL

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1 SYSTEME INTERNATIONAL The following information on SI units and factors for conversion between S.l. and older conventional units is provided for the convenience of readers and authors. Reprints of these tables are available on request from The Canadian Anaesthetists' Society Journal, Suite 901, 94 Cumberland Street, Toronto, Canada, M5R IA3. BASIC SI UNITS Physical quantity Name Symbol Length Metre m Mass Kilogram kg Time Second* s Electric current Ampere A Thermodynamic temperature Kelvin K Luminous intensity Candela cd Amount of substance Mole mol * Minute (min), hour (h) and day (d) will remain in use although they are not official SI units. PREFIXES FOR SI UNITS Factor Name Symbol Factor Name Symbol 10 ~s Exa E 10 -~s Atto- a 10 ~5 Peta P 10 -~s Femto f 10 ~2 Tera- T 10 -~z Pico- p 109 Giga- G 10-9 Nano- n 106 Mega- M 10-6 Micro- la 103 Kilo- k 10-3 Milli- m 102 Hecto- h 10-2 Centi- c 10 ~ Deca- da 10 -~ Deci- d DERIVED SI UNITS Expression in terms of St base units Quantity SI unit Symbol or derived units Frequency Hertz Hz I Hz = I cycle/s (l s -~) Force Newton N 1 N = l kg' mls 2 (1 kg, raps -z) Work, energy, quantity of heal Joule J l J = I N. m Power Watt W I W = lj/s(1j.s -I) Quantity of electricity Coulomb C 1 C = I A.s Electric potential, potential difference, tension, electromotive force Volt V 1 V = 1 W/A (1 W.A -t) Electric capacitance Farad F 1 F = I A. s/v (1 A. s. V -~) Electric resistance Ohm ft I f~ = 1 VtA (1 V. A -t) Flux of magnetic induction, magnetic flux Weber Wb 1 Wb = I V. s Magnetic flux density, magnetic induction Tesla T 1 T = I Wb/m 2 (1 Wb. m -2) Inductance Henry H I H = 1 V. s/a (1 V- s. A -~) Pressure Pascal Pa 1 Pa = 1 Nlm 2 (I N. m -z) = I kg/m.s2(l kg.m -t.s-:) The litre (10-3 m 3 ~ dm~), though not official, will remain in use as a unit of volume as also will the dyne (dyn) as a unit of force (1 dyn = 10 -s N), 652

2 SYST~:ME INTERNATIONAL 653 Old to SI SI to old SI unit Old Unit kpa mm Hg* kpa 1 standard atmospheret (approx: 1 Bar) kpa cmh kpa Ibs/sq in *e.g. systolic BPofl2OmmHg~ 16kPaanddiastolicBPof80mmHg= 11 kpa. t = 760 mm Hg. BLOOD CHEMISTRY. UNITS AND CONVERSION FACTORS Measurement Blood Acid-Base PEO2 P02 Standard bicarbonate Base excess Glucose Plasma Sodium Potassium Magnesium Chloride Phosphate (inorganic) Creatininc Urea Serum Calcium Iron Bilirubin Cholesterol Total proteins Albumin Globulin Old to SI SI to old SI unit Old unit kpa mm Hg ,5 kpa mm Hg mmolllitre meqllitre mmol/litre meqllitre mmol llitre rag/100 ral mmoltlitre meqllitre mmol/litre meq/litre mmol/litre meq/litre mmol/litre raeqllitre mmol/litre meqllitre ~amolllitre mg]100 ml mmol/litre rag/100 ml mmol/litre rag/100 ml lamolllitre p_g/100 mol ,6 ~amol]litre mg]100 ml mmol]litre rag/100 m l g/litre g/100 ml g/litre g]100 ml g/litre g/100 ml BIOCHEMICAL CONTENT OF OTHER BODY FLUIDS Measurement SI unit Old unit Old to SI SI toold Urine Calcium retool/24 h mg]24 h Creatinine mmol/24 h rag/24 h Potassium mmolllitre meqtlitre Sodium mmol/litre meq/litre Cerebro-spinal flum Protein g/litre rag/100 ml Glucose mmol/litre rag/100 ml

3 654 CANADIAN ANAESTHETISTS' SOCIETY JOURNAL HAEMATOLOGY Measurement SI units Old unit Old to S1 SI toold Haemoglobin (Hb) g/dl g/lo0 ml Packed cell volume No unit* Per cent Mean cell Hb cone. g/dl Per cent Mean cell Hb lag lapg Red cell count Cells/litre Cells/ram 3 White cell count Cells/litre Cells/ram 3 Reticulocytes Per cenl Per cent Platelets Cells/litre Cells/ram =6 I0 ~ 10-~ *Expressed as decimal fraction, e.g, normal aduhmale value 0.40 to PH AND NMOL/LITRE OF H + ACTIVITY ph nmol/litre IO ,

4 SYSTEME INTERNATIONAL Pour le b6n6fice des auteurs et des lecteurs, nous publions ci-dessous, les tables de conversion des unit~s de mesures anciennes en Syst~me International, et autres renseignements pertinents. On peut obtenir des reproductions de ces tables de conversion sur simple demande 6crite adress6e au Canadian Anaesthetists' Society Journal, Suite 901,94 Cumberland Street, Toronto, Canada, MSR IA3. UNITES SI DE BASE Quantit~ physique Nora Symbole Longueur M~tre m Masse Kilogramme Kg Temps Seconde* s Courant ~lectrique Ampbre A Temp6rature thermodynamique Kelvin K Intensit6 lumineuse Candela cd Quantit6 de substance Mole mol *Les unit~s minute (mn), heure (h) et jour (j) continuent d'etre employees sans ~tre des unit6s SI. Pm~ftxEs UTILISISS EN SI Facteur Nora Symbole Facteur Nora Symbole l0 ts Exa E 10 -~s Atto- a 1015 Peta P 10 -~s Femto f 10 t2 Tera- T 10 -~2 Pico- p 109 Giga- G 10-9 Nano- n 106 Mega- M 10-6 Miero- It 10 ~ Kilo- k 10-3 Milli- m 102 Hecto- h 10-2 Centi- c 10 t Deca- da 10- t Deci- d UNITIES S[ DERIVES Correspondance en termes d'unit~s Quantit6 Unit6 SI Symbole SI de base ou d6riv6es Frdquence Hertz Hz I Hz = I cyclels (I s -t) Force Newton N I N = I kg. m/s z (1 kg. raps -z) Travail, 6nergie, quantitd de chaleur Joule J 1 J = 1 N. m Puissance Watt W 1 W = l J/s (1 J. s -t) Quantit6d'~lectricit6 Coulomb C 1 C = 1 A. s Potentiel dlectrique, diffdrence de potentiel, tension, force dlectromotrice Volt V 1 V = 1 W/A (I W.A-0 Capacitance~lectrique Farad F 1 F ~ I A.s/V(I A.s.V -~) Rdsistance dlectrique Ohm f~ 1 ~ = l V/A (1 V-A -t) Flux d'induction magn6tique, flux magndtique Weber Wb 1 Wb = 1 V. s Densit6 du flux magn6tique, induction magn6tique Tesla T I T = 1 Wb/m z (1 Wb. m -z) Inductance Henry H 1 H = I V. s/a (1 V. s. A -I) Pression Pascal Pa 1 Pa = 1 N/m 2 (I N- m -z) = 1 kg/m.s2(i kg.m -~.s -z) Le litre (10-3 m ~ = dm3), sans officiellement appartenir au Systbme International, continue de s'employer comme units de volume comme la dyne (dyn) comme units de force (1 dyn = 10 -s N). 655

5 656 CANADIAN ANAESTHETISTS' SOCIETY JOURNAL Ancienne b_ SI S1 b. ancienne Unit6 SI Unit6 ancienne kpa ram Hg* 0,133 7,5 kpa 1 atmosph/:re (760 mm Hg) 101,3 0,01 (approx.: I Bar) kpa cmh20 0, kpa Ibs/po 2 6~89 0,145 *v.g. pression art&ielle systolique de 120 ram Hg = 16 kpa et la pression diaslolique de 80 mm Hg = I 1 kpa. CHIMIE SANGUINE. UNITE.S ET FACTEURS DE CONVERSION Mesure Unit~ SI Unit6 ancienne Ancienne b. SI SI h ancienne Sang Equilibre acide-base PCO2 kpa mm Hg PO2 kpa mm Hg Bicarbonate standard mmol/litre meq/litre ExeCs de base mmol/litre meq/litre Glucose mmol/litre mg/100 ml Plasma Sodium mmol/litre meq/litre Potassium mmol/litre meqllitre Magnfsium mmol/litre meq/litre Chlorure mmol/litre meq/litre Phosphate (inorganique) mmol/litre meqllitre Cr6atinine ~mol/litre rag/100 ml Ur6e mmol/litre rag/100 ml Sdrum Calcium mmol/litre rag/100 ml Fer lamolllitre ~/100 mol Bilirubine itmoltlitre mgtl00 ml 'Choles t~rol mmol/litre rag/100 ml Prot~ines totales gllitre g!100 ml Albumine gtlitre g[100 ml Globuline gtlitre g/100 ml 0,133 7,5 0,133 7,5 0, Num6riquement ~quivalent 0,5 2 0,323 3,0 88,4 0,01 0,166 6,0 0,25 4,0 0,179 5,6 17,1 0,06 0, ,0 0,1 10,0 0,1 10,0 0,1 MESURE BIOCHIMIQUE DANS D~AUTRES LIQUIDES ORGANIQUES Mesure Unit6 SI Unit6 ancienne Ancienne h SI SI b. ancienne Urln e Calcium mmoll2,1 hr mg/24 h Cr~atinine mmol~/24 h mg/24 h Potassium mmol/litre meqllitre Sodium mmol/litre meq/litre Liquide c6phalo-rachldien Prot6 i ne g/lit re mgl 100 ml Glucose mmol/litre mgtl00 ml 0, , Numeriquement 6quivalent Num~riquement ~quivalent 0, ,

6 SYST~ME INTERNATIONAL HEMATOLOGIE 657 Mesure Unit6 SI Unit6 ancienne Ancienne ~. SI SI h ancienne H6moglobine (Hb) g/dl g/100 ml Volume du culot globulaire Pas d'initd* Pour cent Hb cellulaire moyenne (concentrde) g/dl Pour cent Hb cellulaire moyenne pg ~tlag D~compte globules rouges Cellules/litre Cellules/mm 3 Decompte globules blancs Cellules/litre Cellules/mm 3 R6ticulocytes Pour cent Pour cent Plaquettes Cellules/litre Cellules/mm 3 *S'exprime en fraction ddcimale, v.g. valeur normale d'un homme adulte 0,40 h 0,54. Numgriquement 6quivalent 0, Num6riquement gquivalent Num6riquement dquivalent ~, Num~riquement 6quivalent TABLE DE CONVERSION DE ph EN NMOL/LITRE D'ACTIVITE ION H ph nmol/litre 6, , ,00 IO0 7, I0 79 7, , , , , , , , , ,70 20

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