vive la différence? dose vs product dose instructions syntax dr paul miller [email protected]
TRANSCRIPT
Prescribing Model
Dose Based
Hospital / Secondary Care
La différence…
Furosemide 80mg oral at 8am
General Practice / Primary Care
Product based
Furosemide 40mg tablets , take 2 at 8am
InterfaceFurosemide 80mg oral at
8am
Furosemide 40mg tablets, take 2 at 8am
dm+d
VMPVirtual
MedicinalProduct
VMPPVirtual
MedicinalProduct Pack
AMPPActual
MedicinalProduct Pack
AMPActual
MedicinalProduct
VTMVirtual
TherapeuticMoiety
Atenolol 50mg
tablets
Atenolol 50mg
tablets x28
Atenolol 50mg
tablets (Cox) x28
Virtual Product Ingredient
Controlled Drug Prescribing
Combination Pack Content
Drug Tariff Category
Pack Price
Reimbursement Information
Appliance Product
Information
Product Prescribing
Atenolol 50mg
tablets (Cox)
Actual Product Excipient
Product Availability
Atenolol
Virtual Product Form
Virtual Product Route Supplier
Licensed Route
Furosemide 80mg oral at
8am
FurosemideFurosemide
40mg tablets take 2 at 8am
Furosemide 40mg tablets
Solve this with?
• Models of dose & directions – ‘dose syntax’• Would allow calculation of e.g.
– Daily quantities– Compliance– Safety– Dose comparison
• Translation of– Dose to Product– Product to Dose
Model of dose and frequency
• Dose– 40mg– 0.5mcg– 5ml– 2 tablets– Thinly– 2 puffs qds– If Systolic >160 take
80mg
• Frequency– Daily– Three times a day– Once daily at 18:00– Every Wednesday– Reducing by 1 tab a
week to zeroComplex!
Work to date…2005
2008
Dose Syntax Project
• …all dosage instructions require human reading and interpretation and transcription between different systems, both of which offer a variety of opportunity for patient critical error to enter
Dose Syntax Project
• Therefore, having a representation of dosage instructions in a format to support electronic use is a key requirement to move forward in such areas as automated data entry into prescription
• Many systems have local vocabularies to produce dosage instructions ; however these are non -standard in both content and structure
Vision ‘vocabulary’ example
Dose Syntax Project
• Core Components– dose quantity– timing of the dosage– route, site and method of administration – rate of administration– “additional information”
• (e.g. swallow whole, on an empty stomach).
Dose Syntax Class Model
In HL7 V3 Pharmacy Model
Issues
• Dose / Quantity– Reducing doses– mg/kg
• Timing Issues– ‘during waking hours’– ‘except Mondays and Fridays’
• Modelling issues– “0.5 initially. If no joy, take 1 next time. Again if
not successful take 2 next time”
NHS CFH Dose Syntax Abstract Model
• “The Dose Syntax Abstract Model is intended to be independent of any technology standard or software platform and has been developed with the aim of specifying the necessary clinical requirements precisely and unambiguously”
NHS CFH Dose Syntax Abstract Model
• Dose Comparison• Dose Conversion• Dose/Volume Calculations• Dose Range Checking• Ward Medicines Management• Usage within Primary Care• Dosage Presentation
Medication Administrationclass Medication Administration Package
EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version
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Medication Administration
Precondition
- preconditionType: Coded- offset: DurationInterval [0..1]
Additional Instructions
- description: String
Dose String
-/ doseString: String
Medication Administration Instruction
- administrationDetails: String [0..1]
Described Medication
Medication
Dose Quantitie s
Medication Dose Timing
Medication Dose Rate
Medication Dose Quantity
Medication Administration Procedure
- route: Coded [0..1]- administrationSite: Coded [0..*]- excludedAdministrationSite: Coded [0..*]- method: Coded [0..*]
Event Criterion
Goa l
- goalType: Coded
Ev ent Criterion Reference
- value: Reference
Coded Ev ent Criterion
- value: Coded
1..1
+additionalInstructions
0..*
1.. *
+doseTiming
1..1
1..1
+doseString 1..1
1..1
+doseQuantity
0..10..*
+medication
0..1
1..1
+doseRate
0..1
0..*
+criterion 0..1
0..*
+objective 0..1
1..1
+administrationProcedure 0..*
…contains the set of classes, and their relationships and constraints required to describe the administration of a medication
Described Medicationclass Described Medication Package
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Medication Administration
Described Medication
Medication
- medicationId: Coded- form: Coded [0..1]- brand: Coded [0..1]
Ingredient
- ingredientSubstanceId: Coded
Medication Administration Instruction
Ingredient Strength Component
- value: Real- unitOfMeasure: Coded [0..1]
Dose Form Size
- value: Real- unitOfMeasure: Coded [0..1]
1..1
+doseFormSize 0..1
1..1
+strengthNumerator 1..1
0..*
+medication
0..1
1..1
+strengthDenominator 0..1
1..1
+/ingredient
0..*
…the set of classes, and their relationships and constraints that represent aspects of a medication item relevant to specifying a structured Medication Administration Instruction.
Dose Quantitiesclass Dose Quantities PackageEA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version EA 7.1 Unregistered Trial Version
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Dose Quantitie s
Medication Dose Timing
- intention: String- doseTime: Timestamp [0..*] {ordered}
Medication Administration
Medication Administration Instruction
Medication Dose Quantity Ratio
Medication Dose Quantity
Medication Unit Dose Quantity
- value: RealInterval- unitOfMeasure: Coded- unitOfMeasureType: Coded
Time Period
- value: DurationInterval
Medication Dose Rate
- value: RealInterval- unitOfRate: Coded- unitOfMeasureType: Coded
Medication Dose Interv al
- alignment: Coded [0..1]
Medication Dose Frequency
Medication Dose Occurrence
- value: IntegerInterval
Simple Dose Frequenc y
Complex Dose Frequency
- alignment: Coded [0..1]
Inner Timing
1..1
+dosePeriod 1..1
1..1
+periodicInterval
1..1
1..1
+doseRate
0..1
1..1
+doseQuantity
0..1
1.. *
+doseTiming
1..1
0..1
+numerator 1..1
1..1
+doseInterval 1..1
1..1
+courseDuration 0..1
0..1
+numberOfDoses
1..1
1..1
+doseDuration 0..*
1..1
+dosePeriod
1..1
1..1
+innerTiming 1.. *
0..1
+denominator 1..1
…represent the key physical quantity attributes of dose quantity, dose timing and, for continuously administered medications, dose duration and dose rate…
Together…class NHS Dose Syntax Model
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Medication Administration
Precondition
Additional Instructions
Dose String
Medication Administration Instruction
Medication Administration Procedure
Event Criterion
Goa l
Ev ent Criterion ReferenceCoded Ev ent Criterion
Described Medication
Medication Ingredient
Ingredient Strength ComponentDose Form Size
Dose Quantitie s
Medication Dose Timing
Medication Dose Quantity Ratio
Medication Dose Quantity
Medication Unit Dose Quantity
Time Period
Medication Dose Rate
Medication Dose Interv al
Medication Dose Frequency
Medication Dose Occurrence
Simple Dose Frequenc y
Complex Dose Frequency
Inner Timing
1..1
+additionalInstructions
0..*
1..1
+doseString 1..1
1..1
+administrationProcedure 0..*
0..*
+criterion 0..1
0..*
+objective 0..1
0..*
+medication
0..1 1..1
+/ingredient
0..*
1..1
+strengthNumerator 1..1
1..1
+strengthDenominator 0..1
1..1
+doseFormSize 0..1
1.. *
+doseTiming
1..1
1..1
+doseQuantity
0..1 0..1
+numerator 1..1
0..1
+denominator 1..1
1..1
+courseDuration 0..1
1..1
+doseDuration 0..*
1..1
+doseRate
0..1
1..1
+periodicInterval
1..1
1..1
+dosePeriod
1..1
0..1
+numberOfDoses
1..1
1..1
+doseInterval 1..1
1..1
+dosePeriod 1..1
1..1
+innerTiming 1.. *
Dosage Calculations
• Dose Syntax Model:– dose conversion calculations;– dose / volume calculations; and– dose rate calculations
• …to be able to convert VTM or product-based dose quantities … into equivalent product-based quantities
• …handling medications and prescriptions between primary and secondary care.
• Discharge medication instructions…converted into product-based quantities.
Using this!
Complex!
Example 45:
During an in-patient stay, a patient is given Atenolol 75 mg daily basis. When the patient is discharged, the discharge instructions to the GP ask for the patient to remain on Atenolol 75 mg daily until the GP is satisfied with the patient’s condition. If the GP wants to prescribe 318434003|Atenolol 25mg tablets|, how many tablets should be taken daily?
Example 45doseInstruction
medication
medicationId 87652004|Atenolol|form 3319411000001109|tablet| doseQuantity
value 75unitOfMeasure 258684004|mg|unitOfMeasureType IQU (ingredient qty unit)administrationProcedure
route 26643006|oral|
Example 45
So.. why not?
• Still some issues– 29 noted
• Basic problems to solve first• Implementation challenges
– Complexity– User interfaces– Safety– Terminologies
• But one day soon…
Summary
• My ‘tds’ is not your 8:00; 14:00; 18:00• Patients swallow products• Prescribers advise doses• The interface needs a brain• Solvable problem
– But Complex!