Body surface area

In physiology and medicine , body surface area (PPT, English BSA) is the measured or calculated surface of the human body . For many clinical purposes, PPT is a better indicator of metabolic metabolism than body weight, since it is less dependent on excess adipose tissue. ^[one]

Content

Application

Examples of the use of EIP

Calculation of renal clearance ;
The body mass index uses a slightly modified form of PPT;
The exact dosage of drugs in accordance with the patient's PPT during chemotherapy , the appointment of glucocorticoids .
With some methods of additional examination, for example, with echocardiography.

Settlement

Below are some formulas for calculating PPT. ^[2]

Almost all of these formulas have the form:

$BSA=k\times m^{b}\times h^{a}={\frac {m^{b}\times h^{a}}{k^{-1}}}$ ${\ displaystyle BSA = k \ times m ^ {b} \ times h ^ {a} = {\ frac {m ^ {b} \ times h ^ {a}} {k ^ {- 1}}}}$

with different values of k, a and b. Hereinafter:

BSA - body surface area in square meters ;
m is the mass in kilograms ;
h is the height in centimeters .

The most commonly used Mosteller formula :

BSA=0{,}0167\times m^{0{,}5}\times h^{0{,}5}

{\ displaystyle BSA = 0 {,} 0167 \ times m ^ {0 {,} 5} \ times h ^ {0 {,} 5}}

It is especially convenient in that it appears in the form:

BSA={\frac {\sqrt {m\times h}}{60}}

{\ displaystyle BSA = {\ frac {\ sqrt {m \ times h}} {60}}}

Formula Dubois and Dubois :

BSA=0{,}007184\times m^{0{,}425}\times h^{0{,}725}={\frac {m^{0{,}425}\times h^{0{,}725}}{139{,}2}}

{\ displaystyle BSA = 0 {,} 007184 \ times m ^ {0 {,} 425} \ times h ^ {0 {,} 725} = {\ frac {m ^ {0 {,} 425} \ times h ^ {0 {,} 725}} {139 {,} 2}}}

Haycock formula :

BSA=0{,}024265\times m^{0{,}5378}\times h^{0{,}3964}={\frac {m^{0{,}5378}\times h^{0{,}3964}}{41{,}2}}

{\ displaystyle BSA = 0 {,} 024265 \ times m ^ {0 {,} 5378} \ times h ^ {0 {,} 3964} = {\ frac {m ^ {0 {,} 5378} \ times h ^ {0 {,} 3964}} {41 {,} 2}}}

The formula of Gehan and George :

BSA=0{,}0235\times m^{0{,}51456}\times h^{0{,}42246}={\frac {m^{0{,}51456}\times h^{0{,}42246}}{42{,}553}}

{\ displaystyle BSA = 0 {,} 0235 \ times m ^ {0 {,} 51456} \ times h ^ {0 {,} 42246} = {\ frac {m ^ {0 {,} 51456} \ times h ^ {0 {,} 42246}} {42 {,} 553}}}

Boyd's formula (Attention! Here the mass is indicated in grams) :

BSA=0{,}0003207\times m^{(0{,}7285-0{,}0188\log _{10}{m})}\times h^{0{,}3}={\frac {m^{(0{,}7285-0{,}0188\log _{10}{m})}\times h^{0{,}3}}{3118{,}18}}

{\ displaystyle BSA = 0 {,} 0003207 \ times m ^ {(0 {,} 7285-0 {,} 0188 \ log _ {10} {m})} \ times h ^ {0 {,} 3} = {\ frac {m ^ {(0 {,} 7285-0 {,} 0188 \ log _ {10} {m})} \ times h ^ {0 {,} 3}} {3118 {,} 18}} }

Fujimoto formula :

BSA=0{,}008883\times m^{0{,}444}\times h^{0{,}663}={\frac {m^{0{,}444}\times h^{0{,}663}}{112{,}575}}

{\ displaystyle BSA = 0 {,} 008883 \ times m ^ {0 {,} 444} \ times h ^ {0 {,} 663} = {\ frac {m ^ {0 {,} 444} \ times h ^ {0 {,} 663}} {112 {,} 575}}}

Takahir formula :

BSA=0{,}007241\times m^{0{,}425}\times h^{0{,}725}={\frac {m^{0{,}425}\times h^{0{,}725}}{138{,}1}}

{\ displaystyle BSA = 0 {,} 007241 \ times m ^ {0 {,} 425} \ times h ^ {0 {,} 725} = {\ frac {m ^ {0 {,} 425} \ times h ^ {0 {,} 725}} {138 {,} 1}}}

Formula Shooter and Aslani :

BSA=0{,}00949\times m^{0{,}331}\times h^{0{,}655}={\frac {m^{0{,}331}\times h^{0{,}655}}{105{,}374}}

{\ displaystyle BSA = 0 {,} 00949 \ times m ^ {0 {,} 331} \ times h ^ {0 {,} 655} = {\ frac {m ^ {0 {,} 331} \ times h ^ {0 {,} 655}} {105 {,} 374}}}

Schlich formula for men :

BSA=0{,}000579479\times m^{0{,}38}\times h^{1{,}24}={\frac {m^{0{,}38}\times h^{1{,}24}}{1725{,}688}}

{\ displaystyle BSA = 0 {,} 000579479 \ times m ^ {0 {,} 38} \ times h ^ {1 {,} 24} = {\ frac {m ^ {0 {,} 38} \ times h ^ {1 {,} 24}} {1725 {,} 688}}}

Schlich formula for women :

BSA=0{,}000975482\times m^{0{,}46}\times h^{1{,}08}={\frac {m^{0{,}46}\times h^{1{,}08}}{1025{,}134}}

{\ displaystyle BSA = 0 {,} 000975482 \ times m ^ {0 {,} 46} \ times h ^ {1 {,} 08} = {\ frac {m ^ {0 {,} 46} \ times h ^ {1 {,} 08}} {1025 {,} 134}}}

Costeff's formula (based on body weight) :

BSA=(4\times m+7)\div (m+90)

{\ displaystyle BSA = (4 \ times m + 7) \ div (m + 90)}

Mattar formula :

BSA=(h+m-60)\div 100

{\ displaystyle BSA = (h + m-60) \ div 100}

Livingston and Scott Formula :

BSA=0{,}1173\times m^{0{,}6466}={\frac {m^{0{,}6466}}{8{,}525}}

{\ displaystyle BSA = 0 {,} 1173 \ times m ^ {0 {,} 6466} = {\ frac {m ^ {0 {,} 6466}} {8 {,} 525}}}

Yu formula (similar to Mosteller's formula) :

BSA=0{,}015925\times m^{0{,}5}\times h^{0{,}5}={\frac {\sqrt {m\times h}}{62{,}794}}

{\ displaystyle BSA = 0 {,} 015925 \ times m ^ {0 {,} 5} \ times h ^ {0 {,} 5} = {\ frac {\ sqrt {m \ times h}} {62 {, } 794}}}

US Environmental Protection Agency Formula

BSA=0{,}0239\times m^{0{,}517}\times h^{0{,}417}={\frac {m^{0{,}517}\times h^{0{,}417}}{41{,}841}}

{\ displaystyle BSA = 0 {,} 0239 \ times m ^ {0 {,} 517} \ times h ^ {0 {,} 417} = {\ frac {m ^ {0 {,} 517} \ times h ^ {0 {,} 417}} {41 {,} 841}}}

Normal Values

The “normal value” of PPT is 1.73 m ² for adults. Origin of the “norm”: “There was an average BSA of 1.73 m ² for 3,000 cancer patients from 1990 to 1998 in a European Organization for Research and Treatment of Cancer (EORTC) database. During 2005 there was an average BSA of 1.79 m ² for 3,613 adult cancer patients in the UK. Among them the average BSA for men was 1.91 m ² and for women was 1.71 m ^2. " ( https://en.wikipedia.org/wiki/Body_surface_area )

PPT values (m ² )
Newborn	0.25
2 years baby	0.5
9 years old child	1,07
Child 10 years old	1.14
Child 12-13 years old	1.33
For men	1.9
For women	1,6

Notes

Links

[1] Tryphonov EB Human Psychophysiology. The Russian-English-Russian Encyclopedia, 13th ed., 2009. Trifonov E. V. Human psychophysiology. Russian-English-Russian Encyclopedia, 13 ...

[2] Calculation of surface area, mass index, dry weight and ideal body weight (neopr.) .