Hypertension resistant to conventional therapy (HP_0430034, a Human Phenotype Ontology identifier) can be described as follows. Resistant hypertension is defined as above-goal elevated blood pressure in a patient despite the concurrent use of 3 antihypertensive drug classes, commonly including a long-acting calcium channel blocker, a blocker of the renin-angiotensin system (angiotensin-converting enzyme inhibitor or angiotensin receptor blocker), and a diuretic. Also known as: Resistant hypertension.