MediaWiki:Gadget-calculator-anatomyPhysiology.js
From WikiAnesthesia
Revision as of 14:38, 29 July 2021 by Chris Rishel (talk | contribs)
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( function() {
var moduleId = 'patientStats';
mw.calculators.addUnitsBases( {
hgb: {
toString: function( units ) {
units = units.replace( 'hgbperdL', '/dL' );
units = units.replace( 'pcthct', '%' );
return units;
}
}
} );
mw.calculators.addUnits( {
ghgbperdL: {
baseName: 'hgb',
prefixes: 'short'
},
pcthct: {
baseName: 'hgb',
definition: '3 ghgbperdL'
}
} );
mw.calculators.addVariables( {
hct: {
name: 'Current hematocrit / hemoglobin',
type: 'number',
abbreviation: 'Hct/hgb',
defaultValue: '45 pcthct',
maxLength: 4,
units: [
'pcthct',
'ghgbperdL'
]
},
minHct: {
name: 'Minimum allowable hematocrit/hemoglobin',
type: 'number',
abbreviation: 'Min hct/hgb',
defaultValue: '21 pcthct',
maxLength: 4,
units: [
'pcthct',
'ghgbperdL'
]
}
} );
mw.calculators.addCalculations( {
bladeMacSize: {
name: 'Laryngoscope blade size (MAC)',
abbreviation: 'Blade (MAC)',
data: {
variables: {
required: [ 'age' ]
}
},
type: 'string',
references: [
'Smith\'s Anesthesia for Infants and Children. 8e. p356'
],
calculate: function( data ) {
var age = data.age.toNumber( 'yo' );
if( age >= 6 ) {
return '3';
} else if( age >= 1 ) {
// ( age + 16 ) / 4
// To nicely display in increments of 0.5, double the calculation, round (floor), then divide by 2
return '2';
} else {
return '-';
}
}
},
bladeMillerSize: {
name: 'Laryngoscope blade size (Miller)',
abbreviation: 'Blade (Miller)',
data: {
variables: {
required: [ 'age' ]
}
},
type: 'string',
references: [
'Smith\'s Anesthesia for Infants and Children. 8e. p356'
],
calculate: function( data ) {
var age = data.age.toNumber( 'yo' );
if( age >= 2 ) {
return '2';
} else if( age >= 1 / 12 ) {
return '1';
} else if( age >= 0 ) {
return '0-1';
} else {
return '0';
}
}
},
bmi: {
name: 'Body mass index',
abbreviation: 'BMI',
data: {
variables: {
required: [ 'weight', 'height' ]
}
},
digits: 0,
units: 'kg/m^2',
formula: '<math>\\mathrm{BMI} = \\frac{\\text{mass}_\\text{kg}}{{\\text{height}_\\text{m}}^2}</math>',
link: '[[Body mass index]]',
references: [],
calculate: function( data ) {
return data.weight.toNumber( 'kgwt' ) / Math.pow( data.height.toNumber( 'm' ), 2 );
}
},
bsa: {
name: 'Body surface area',
abbreviation: 'BSA',
data: {
variables: {
required: [ 'weight', 'height' ]
}
},
formula: '<math>\\mathrm{BSA} = 0.007184 \\times W^{0.425} \\times H^{0.725}</math>',
link: false,
references: [
'Verbraecken, J; Van de Heyning P; De Backer W; Van Gaal L (Apr 2006). "Body surface area in normal-weight, overweight, and obese adults. A comparison study". Metabolism: Clinical and Experimental. 55 (4): 515–24. doi:10.1016/j.metabol.2005.11.004. PMID 16546483'
],
calculate: function( data ) {
return Math.pow( data.weight.toNumber( 'kgwt' ), 0.425 ) * Math.pow( data.height.toNumber( 'cm' ), 0.725 );
}
},
ebv: {
name: 'Estimated blood volume',
abbreviation: 'EBV',
data: {
variables: {
required: [ 'weight', 'age' ]
}
},
digits: 0,
units: 'mL',
formula: '',
references: [
'Morgan & Mikhail\'s Clinical Anesthesiology. 5e. p1168'
],
calculate: function( data ) {
var weight = data.weight.toNumber( 'kgwt' );
var age = data.age.toNumber( 'yo' );
var ebvPerKg;
if( age >= 1 ) {
if( data.gender === 'F' ) {
ebvPerKg = 65;
} else {
ebvPerKg = 75;
}
} else if( age >= 1/12 ) {
ebvPerKg = 80;
} else if( age >= 0 ) {
ebvPerKg = 85;
} else {
ebvPerKg = 95;
}
return weight * ebvPerKg;
}
},
ettSize: {
name: 'Endotracheal tube size',
abbreviation: 'ETT size',
data: {
variables: {
required: [ 'age' ],
optional: [ 'height' ]
}
},
type: 'string',
references: [
'Smith\'s Anesthesia for Infants and Children. 8e. p356'
],
calculate: function( data ) {
var age = data.age.toNumber( 'yo' );
if( age >= 12 ) {
return '6+';
} else if( age >= 1 ) {
// ( age + 16 ) / 4
// To nicely display in increments of 0.5, double the calculation, round (floor), then divide by 2
return String( Math.floor( 2 * ( ( age + 16 ) / 4 ) ) / 2 );
} else if (age >= 0.5 ) {
return '3.5-4';
} else if( age >= 0 ) {
return '3-3.5';
} else {
return '2.5-3';
}
}
},
fluidMaintenanceRate: {
name: 'Fluid maintenance rate',
abbreviation: 'Fluid maint.',
data: {
variables: {
required: [ 'weight' ]
}
},
digits: 0,
units: 'mL/hr',
formula: '',
references: [
'Miller\'s Anesthesia 7e, section IV, pg. 1728'
],
calculate: function( data ) {
var weight = data.weight.toNumber( 'kgwt' );
// Uses 4-2-1 rule
var maintenanceRate = 4 * Math.min( weight, 10 );
if( weight > 10 ) {
maintenanceRate += 2 * Math.min( weight - 10, 10 );
}
if( weight > 20) {
maintenanceRate += weight - 20;
}
return maintenanceRate;
}
},
ibw: {
name: 'Ideal body weight',
abbreviation: 'IBW',
data: {
variables: {
required: [ 'height', 'gender' ]
}
},
units: 'kg',
link: 'https://en.wikipedia.org/wiki/Human_body_weight#Ideal_body_weight',
references: [
'Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650–655.'
],
calculate: function( data ) {
if( data.height.toNumber( 'cm' ) < 152 ) {
throw new Error( 'Ideal body weight may only be applied to persons 152 cm (60 inches) or taller' );
}
var baseWeight = data.gender === 'F' ? 45.5 : 50;
// baseWeight + 2.3 kg for every inch over 5 feet
return baseWeight + 2.3 * ( data.height.toNumber( 'in' ) - 60 );
}
},
lbw: {
name: 'Lean body weight',
abbreviation: 'LBW',
data: {
variables: {
required: [ 'gender', 'height', 'weight' ]
}
},
units: 'kg',
link: 'https://en.wikipedia.org/wiki/Lean_body_mass',
references: [
'Janmahasatian S, Duffull SB, Ash S, Ward LC, Byrne NM, Green B. Quantification of lean bodyweight. Clin Pharmacokinet. 2005; 44(10): 1051-65.'
],
calculate: function( data ) {
if( data.gender === 'F' ) {
return 9270 * data.weight.toNumber( 'kgwt' ) / ( 8780 + 244 * data.weight.toNumber( 'kgwt' ) / Math.pow( data.height.toNumber( 'm' ), 2 ) );
} else {
return 9270 * data.weight.toNumber( 'kgwt' ) / ( 6680 + 216 * data.weight.toNumber( 'kgwt' ) / Math.pow( data.height.toNumber( 'm' ), 2 ) );
}
}
},
maxAbl: {
name: 'Maximum allowable blood loss',
abbreviation: 'Max ABL',
data: {
calculations: {
required: [ 'ebv' ]
},
variables: {
required: [ 'weight', 'age', 'hct', 'minHct' ]
}
},
digits: 0,
units: 'mL',
formula: '',
references: [
'Morgan & Mikhail\'s Clinical Anesthesiology. 5e. p1168'
],
calculate: function( data ) {
return data.ebv.toNumber( 'mL' ) * ( data.hct.toNumber( 'pcthct' ) - data.minHct.toNumber( 'pcthct' ) ) / data.hct.toNumber( 'pcthct' ) ;
},
onRendered: function( $selector ) {
$selector.after( mw.calculators.getVariable( 'hct' ).createInput() );
$selector.after( mw.calculators.getVariable( 'minHct' ).createInput() );
}
}
} );
var tableMaxWidth = 600;
mw.calculators.addCalculators( moduleId, {
anatomy: {
name: 'Patient statistics',
calculations: [
'bmi',
'bsa',
'ibw',
'lbw'
],
css: {
'max-width': tableMaxWidth
},
table: true
},
equipment: {
name: 'Equipment',
calculations: [
'bladeMacSize',
'bladeMillerSize',
'ettSize'
],
css: {
'max-width': tableMaxWidth
},
table: true
},
fluidManagement: {
name: 'Fluid management',
calculations: [
'ebv',
'fluidMaintenanceRate',
'maxAbl'
],
css: {
'max-width': tableMaxWidth
},
table: true
}
} );
}() );