Hypertension phenotype
Name phenotype_ht
Chapter Circulatory disease/Hypertension
Definition
Hypertension is defined as any of the following:

Diagnosed

* Diagnosis of hypertension during a consultation in primary care 
* Diagnosis of hypertension (primary or secondary) during a hospitalisation

Inferred

* Based on continuous blood pressure readings: presence of at least 3 systolic or diastolic high blood pressure readings within a 1 year period (SYS_BP  >= 150 mmHg OR DIAS_BP >= 90 mmHg), or at least 2 systolic or diastolic high blood pressure readings within a 6 month period. For diabetic patients and patients over 60 years old, a lower threshold is used (SYS_BP  >= 140 mmHg OR DIAS_BP >= 90 mmHg). 

* Based on medication: at least two prescriptions of blood pressure lowering medication within 6 months from British National Formulary chapters 2.2.1 (Thiazides), 2.2.3 (loop diuretics), 2.2.4 (Potassium-sparing diuretics with other diuretics), 2.4 (beta blockers), 2.5 (hypertension and heart failure related medication) and 2.6.2 (calcium-channel blockers).
Data sources GPRD, HES
Dictionaries Read, Multilex, ICD 10
Repeated No
Agreed 01/05/2013 (Revision 1)
Phenotype components
Variable TitleCategories
bp_gprd Blood pressure measurement
bp_meds Blood pressure medication (primary care)
ht_gprd Hypertension diagnosis (primary care)
  • 3 - Hypertension
  • 4 - Secondary hypertension
ht_hes Hypertension diagnosis (secondary care)
  • 3 - Hypertension
  • 4 - Secondary hypertension
ht_opcs Hypertension drugs during procedure (secondary care)
  • 3 - Hypertension
Codelist version
Codelist authors
Creation date
Warning! Unless explicitly noted otherwise, three-digit ICD10/OPCS4 codes also include all codes below them.
Category (code) Read code Read term CPRD Medcode
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