Hypertension

How hypertension is defined and classified

The current US guideline categories:

• Normal: < 120 / < 80
• Elevated: 120-129 / < 80
• Stage 1 hypertension: 130-139 / 80-89
• Stage 2 hypertension: ≥ 140 / ≥ 90
• Hypertensive urgency / crisis: ≥ 180 / ≥ 120

These categories describe a sustained reading — single high readings in stressful moments are not hypertension. The diagnosis is made when the pattern persists across multiple readings, ideally taken at home over a week or longer.

Why hypertension is worth treating well

Untreated or under-controlled hypertension drives:

• Stroke — the strongest modifiable risk factor; a 10 mmHg sustained reduction in systolic BP reduces stroke risk by 25-30%.
• Heart attack and coronary disease — independent of cholesterol and other risk factors.
• Heart failure — chronic pressure overload leads to ventricular remodeling and eventual failure.
• Kidney disease — chronic kidney disease and end-stage renal disease.
• Cognitive decline and dementia — vascular contribution to dementia is increasingly understood; controlled BP in midlife appears to reduce late-life dementia risk.
• Aortic disease — aneurysm and dissection risk both elevated.

The leverage on these outcomes is large. Effective BP control is among the highest-yield interventions in adult medicine.

How blood pressure is properly measured

Bad measurement technique produces bad data and bad decisions. Proper technique:

• Seated, back supported, feet flat on floor
• Arm at heart level, supported (not held up by the patient)
• Cuff size appropriate for arm circumference (most adults need the "large adult" cuff, not standard)
• Five minutes of quiet rest before reading
• No caffeine, exercise, or smoking within 30 minutes
• Two readings, 1-2 minutes apart, averaged

Home measurement done this way, twice daily (morning and evening) for seven days, gives the most accurate picture and is the foundation of modern hypertension management. A validated automated upper-arm cuff (Omron, Withings, A&D, or similar AAMI/BHS-validated device) is the recommended hardware. Wrist cuffs are less reliable; finger cuffs should not be used for clinical decisions.

The cardiology workup for new hypertension

First visit components:

• Detailed history — onset, family history, prior readings, medications (including over-the-counter — decongestants and NSAIDs raise BP), lifestyle, symptoms
• Review of any prior labs and BP history
• Basic labs — comprehensive metabolic panel (kidney function, potassium, sodium), urinalysis, lipid panel, TSH, sometimes aldosterone/renin if secondary cause is suspected
• ECG — to look for left ventricular hypertrophy, the structural footprint of chronic hypertension
• Sometimes echocardiogram, sleep study, or kidney imaging if indicated

Most adult hypertension is "primary" — no single identifiable cause, multifactorial drivers. About 5-10% has a secondary cause (renovascular disease, aldosterone excess, sleep apnea, thyroid disease, certain medications) — the workup screens for these when the picture suggests them.

How treatment is decided

Lifestyle — first and continued

• DASH diet — high fruits, vegetables, whole grains, low-fat dairy, lean protein; reduces SBP by 8-14 mmHg in trials.
• Sodium < 2.3 g/day (ideally < 1.5 g) — reduces SBP by 4-8 mmHg. Most US sodium intake comes from processed and restaurant food, not the salt shaker.
• Sustained weight loss — every kg of weight loss reduces SBP by about 1 mmHg in overweight patients.
• Aerobic exercise — 150 minutes per week of moderate intensity reduces SBP by 5-8 mmHg.
• Alcohol reduction — even moderate intake raises BP; cutting back lowers it.

Medications — the standard classes

Four first-line classes, often used in combination:

• ACE inhibitors (lisinopril, ramipril, enalapril) or angiotensin receptor blockers / ARBs (losartan, valsartan, telmisartan) — block the renin-angiotensin system. Especially good for patients with diabetes, chronic kidney disease, or heart failure.
• Calcium channel blockers (amlodipine, nifedipine ER, diltiazem) — relax arterial smooth muscle. Especially effective in older patients and African American patients.
• Thiazide diuretics (chlorthalidone, hydrochlorothiazide) — reduce sodium-volume retention. Inexpensive, well-tolerated, strong outcomes data.
• Beta blockers — not typically first-line for hypertension alone, but indicated when patients also have coronary disease, heart failure, or arrhythmias.

The standard combination for resistant patients is an ACE inhibitor or ARB plus a CCB plus a thiazide — three classes from three different mechanisms.

Resistant hypertension

Defined as uncontrolled BP despite three medications at maximum dose (or controlled but requiring four medications). Triggers a more detailed workup — secondary causes, sleep apnea evaluation, medication adherence review, salt-intake assessment, and sometimes more advanced therapies (spironolactone, renal denervation in select cases).

How virtual cardiology handles hypertension

1. First visit by video. Detailed history, review of any prior labs and BP readings, plan for confirming the diagnosis with home monitoring, screening labs ordered.
2. Home BP series. Twice-daily readings for 7 days with a validated cuff, results uploaded or sent to your cardiologist.
3. Follow-up visit to confirm diagnosis and start therapy. Lifestyle plan, medication if indicated, target BP set.
4. Titration visits every 4-6 weeks during titration. Home BP readings reviewed, medication adjusted, labs repeated as needed.
5. Maintenance visits every 3-12 months once at target. Annual labs, periodic home BP confirmation, lifestyle reinforcement.

Most patients reach target in two to four titration cycles. The virtual model fits this workflow well because the data (home BP series, labs, medication response) all transmits cleanly by video and patient portal.

The bottom line

Hypertension is among the most modifiable, most studied, and most rewarding conditions to manage well. The leverage on long-term cardiovascular and cognitive outcomes is large, the medications are inexpensive and effective, and the workflow runs cleanly through a virtual cardiology relationship. The most important things to bring to your first visit are an accurate home BP series and a willingness to commit to the lifestyle pieces — the rest follows.