MediaWiki:Gadget-calculator-cardiovascular.js

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( function() {
    mw.calculators.addUnitsBases( {
        bpm: {
            toString: function( units ) {
                units = units.replace( 'bpm', 'beats/min' );

                return units;
            }
        },
        hgb: {
            toString: function( units ) {
                units = units.replace( 'hgbperdL', '/dL' );
                units = units.replace( /\s?pcthct/, '%' );

                return units;
            }
        },
        o2: {
            toString: function( units ) {
                units = units.replace( /\s?pcto2/, '%' );

                return units;
            }
        }
    } );

    mw.calculators.addUnits( {
        bpm: {
            baseName: 'bpm'
        },
        pcthct: {
            baseName: 'hgb'
        },
        pcto2: {
            baseName: 'o2'
        },
        ghgbperdL: {
            baseName: 'hgb',
            prefixes: 'short',
            definition: '3 pcthct'
        }
    } );

    mw.calculators.addVariables( {
        heartRate: {
            name: 'Heart rate',
            type: 'number',
            abbreviation: 'HR',
            defaultValue: '60 bpm',
            maxLength: 4,
            units: [
                'bpm'
            ]
        },
        hgb: {
            name: 'Hemoglobin/hematocrit',
            type: 'number',
            abbreviation: 'HgB',
            minValue: '3 ghgbperdL',
            maxValue: '25 ghgbperdL',
            defaultValue: '13 ghgbperdL',
            maxLength: 4,
            units: [
                'pcthct',
                'ghgbperdL'
            ]
        },
        saO2: {
            name: 'SaO<sub>2</sub>',
            type: 'number',
            abbreviation: 'SaO<sub>2</sub>',
            minValue: '25 pcto2',
            maxValue: '100 pcto2',
            defaultValue: '100 pcto2',
            maxLength: 3,
            units: [
                'pcto2'
            ]
        },
        smvO2: {
            name: 'SmvO<sub>2</sub>',
            type: 'number',
            abbreviation: 'SmvO<sub>2</sub>',
            minValue: '25 pcto2',
            maxValue: '100 pcto2',
            defaultValue: '75 pcto2',
            maxLength: 3,
            units: [
                'pcto2'
            ]
        }
    } );

    // Force re-render of bsa.
    // This is necessary to remove the additional inputs for patient variables
    // from the calculation which are now provided by the patient input toolbar.
    mw.calculators.calculations.bsa.render();

    mw.calculators.addCalculations( {
        systolicBloodPressure: {
            name: 'Systolic blood pressure',
            abbreviation: 'SBP',
            data: {
                variables: {
                    required: [ 'age' ]
                }
            },
            type: 'string',
            references: [
                'Baby Miller 6e, ch. 16, pg. 550'
            ],
            calculate: function( data ) {
                var age = data.age.toNumber( 'yo' );

                var systolicMin, systolicMax, diastolicMin, diastolicMax, meanMin, meanMax;

                if( age >= 16 ) {
                    systolicMin = 100;
                    systolicMax = 125;
                } else if( age >= 13 ) {
                    systolicMin = 95;
                    systolicMax = 120;
                } else if( age >= 9 ) {
                    systolicMin = 90;
                    systolicMax = 115;
                } else if( age >= 6 ) {
                    systolicMin = 85;
                    systolicMax = 105;
                } else if( age >= 3 ) {
                    systolicMin = 80;
                    systolicMax = 100;
                } else if( age >= 1 ) {
                    systolicMin = 75;
                    systolicMax = 95;
                } else if( age >= 6 / 12 ) {
                    systolicMin = 70;
                    systolicMax = 90;
                } else if( age >= 1 / 12 ) {
                    systolicMin = 65;
                    systolicMax = 85;
                } else {
                    systolicMin = 60;
                    systolicMax = 75;
                }
            }
        }
    } );

    // Cardiovascular
    mw.calculators.addCalculations( {
        vO2: {
            name: 'Rate of oxygen consumption (VO<sub>2</sub>)',
            abbreviation: 'VO<sub>2</sub>',
            data: {
                calculations: {
                    required: [ 'bsa' ]
                },
                variables: {
                    optional: [ 'age' ]
                }
            },
            units: 'mL/min',
            formula: '<math>\\mathrm{VO_2} = \\begin{cases} 125 * \\mathrm{BSA}  & \\text{if age} < 70 \\\\ 110 * \\mathrm{BSA} & \\text{if age} \\geq 70 \\end{cases}</math>',
            references: [],
            calculate: function( data ) {
                var bsa = data.bsa.toNumber();
                var age = data.age ? data.age.toNumber( 'yr' ) : null;

                if( age < 70 ) {
                    return 125 * bsa;
                } else {
                    return 110 * bsa;
                }
            }
        },
        cardiacOutputFick: {
            name: 'Cardiac output (Fick)',
            abbreviation: 'CO (Fick)',
            data: {
                variables: {
                    required: [ 'saO2', 'smvO2', 'hgb' ]
                },
                calculations: {
                    required: [ 'vO2' ]
                }
            },
            units: 'L/min',
            formula: '<math>\\mathrm{CO_{Fick}}=\\frac{\\mathrm{VO_2}}{(\\mathrm{S_aO_2} - \\mathrm{S_{mv}O_2}) * H_b * 13.4}</math>',
            link: false,
            references: [],
            calculate: function( data ) {
                var vO2 = data.vO2.toNumber( 'mL/min' );
                var saO2 = data.saO2.toNumber() / 100;
                var smvO2 = data.smvO2.toNumber() / 100;
                var hgb = data.hgb.toNumber( 'ghgbperdL' );

                return vO2 / ( ( saO2 - smvO2 ) * hgb * 13.4 );
            }
        },
        cardiacIndex: {
            name: 'Cardiac index',
            abbreviation: 'CI',
            data: {
                calculations: {
                    required: [ 'bsa', 'cardiacOutputFick' ]
                }
            },
            units: 'L/min/m^2',
            formula: '<math>\\mathrm{CI}=\\frac{\\mathrm{CO}}{\\mathrm{BSA}}</math>',
            link: false,
            references: [],
            calculate: function( data ) {
                var cardiacOutput = data.cardiacOutputFick.toNumber( 'L/min' );
                var bsa = data.bsa.toNumber( 'm^2' );

                return cardiacOutput / bsa;
            }
        },
        strokeVolume: {
            name: 'Stroke volume',
            abbreviation: 'SV',
            data: {
                variables: {
                    required: [ 'heartRate' ]
                },
                calculations: {
                    required: [ 'cardiacOutputFick' ]
                }
            },
            units: 'mL',
            formula: '<math>\\mathrm{SV}=\\frac{\\mathrm{CO}}{\\mathrm{HR}}</math>',
            link: false,
            references: [],
            calculate: function( data ) {
                var cardiacOutput = data.cardiacOutputFick.toNumber( 'mL/min' );
                var heartRate = data.heartRate.toNumber();

                return cardiacOutput / heartRate;
            }
        }
    } );
}() );