SPYRAL PIVOTAL - SPYRAL HTN-OFF MED Study

Inclusion Criteria:

* Individual has office systolic blood pressure (SBP) ≥ 150 mmHg and \<180 mmHg and a diastolic blood pressure (DBP) ≥ 90 mmHg after being off medications.
* Individual has 24-hour Ambulatory Blood Pressure Monitoring (ABPM) average SBP ≥ 140 mmHg and \< 170 mmHg.
* Individual is willing to discontinue current antihypertensive medications.

Exclusion Criteria:

* Individual lacks appropriate renal artery anatomy.
* Individual has estimated glomerular filtration rate (eGFR) of \<45.
* Individual has type 1 diabetes mellitus or poorly-controlled type 2 diabetes mellitus.
* Individual has one or more episodes of orthostatic hypotension.
* Individual requires chronic oxygen support or mechanical ventilation other than nocturnal respiratory support for sleep apnea.
* Individual has primary pulmonary hypertension.
* Individual is pregnant, nursing or planning to become pregnant.
* Individual has frequent intermittent or chronic pain that results in treatment with nonsteroidal anti-inflammatory drugs (NSAIDs) for two or more days per week over the month prior to enrollment.
* Individual has stable or unstable angina within 3 months of enrollment, myocardial infarction within 3 months of enrollment; heart failure, cerebrovascular accident or transient ischemic attack, or atrial fibrillation at any time.
* Individual works night shifts.