7/11/12 - P&P of HT Flashcards
Secondary Hypertension Causes
Goal:
Remove causative agent or treat underlying condition
Caused by:
- *Comorbid Conditions**
- *Renovascular / SLEEP APNEA / 1* Aldosteronism**
- cushings / pheochromocytoma / thyroid disease / HYPERparathyroidism*
Medications
Amphetamines / Steroids / Decongestants / NSAIDS
Estrogens / Calcineurin inhibitors / Ergot Alkaloids / Erythropoiesis-stimuating agents / Estrogens
- *Food:**
- *Alcohol / Licorice / Sodium**
What Determines BP?
(Arterial Blood Pressure)
- *ABP** = CO x PR
- *Cardiac Output x Peripheral Resistance**
CO = SV x HR
- *PR determined by:**
- *Vascular Structure/Function**
What determines CO = Cardiac Output?
BP = CO x PR
CO = SV x HR
Stroke Volume x Heart Rate
↑Preload = ↑Na+ Intake / renal retention
Venous Constriction
↑RAAS stimulation
↑SNS
What Determines HEART RATE?
BP = CO x PR
CO = HR x SV
ParaSympathetic
Rest / Digest
ACth on heart pacemaker cells –> ↓HR
Sympathetic
Fight/Flight
NE/Epi on pacemaker cells:
–> ↑HR & ↑SV –> vasoconstriction –> ↑PR
What Determines STROKE VOLUME?
BP = CO x PR
CO = HR x SV
- *Intrinsic Control**
- *HEART RATE** & Contractility
- *Extrinsic Control**
- *NE/Epi** on BETA-adrenergic receptors
- ↑*Force of Contraction–>↑SV
What determines PERIPHERAL RESISTANCE = PR?
BP = CO x PR
Vascular Constriction** +/- **Vascular HYPERtrophy
↑RAAS
↑SNS over-activity
genetic changes in cell membranes / endothelial factors
Normal BP
ACC/AHA Guidelines
SBP = <120 mmHg
AND
DBP = <80 mmHg
ELEVATED BP
ACC/AHA Guidelines
SBP = 120-129 mmHg
AND
DBP = <80 mmHg
Stage 1 HyperTension
ACC/AHA Guidelines
SBP = 130-139 mmHg
OR
DBP = 80-89 mmHg
Stage 2 HyperTension
ACC/AHA Guidelines
SBP = _>_140 mmHg
OR
DBP = >90 mmHg
SPRINT trial Population
Systolic BP Intevention Trial
>50 y/o w/ SBP 130-180
AND
> 1 additional RF for CV disease:
> 75 y/o // Clinical CVD (except stroke) // Subclinical CV disease
ASCVD > 15%
Exclusions:
DM / proteinuria / nursing home residents / symptomatic HF / history of CVA
- *SPRINT**
- *Prmary Study outcomes & results**
CVD composite - first occurence of:
MI / non-MI Acute Coronary Syndrome/Stroke / HF / Death
- *INTENSIVE TREATMENT** = 2-3 Meds
- *BETTER ALL**:
- *Reducing BP / Primary Outcomes / Mortality / Fraility / Gait**
ACCORD BP Results
Action to Control CV risk in DIABETES BP
NO BENEFIT in PRIMARY ENDPOINT
composite of non-fatal MI / stroke / CVD death
ACC/AHA BP Goals for:
Clinical CVD
or
10 yr ASCVD Risk > 10%
< 130/80
BP Threshold:
> 130/80
Same for those with these specific comorbidities:
DM / CKD / CHF / PAD / secondary stroke prevention
Stable ischemic Heart Disease
ACC/AHA BP Goals for:
No Clinical CVD
or
10 yr ASCVD Risk < 10%
< 130/80
BP Threshold:
> 140/90
ACC/AHA BP Goals for:
Older Person > 65y/o
Community Dwelling
< 130 SBP
BP Threshold:
> 130 SBP
Screening for Secondary HTN / Refractory HTN
Abrupt Onset
Onset < 30 yo
Exacerbation of previously controlled HTN
TOD disproportionate to degree of HTN
Malignant HTN
NEW Diastolic HTN > 65 yo
unprovoked / excessive HypoKalemia
Diagnosis of HT & New Recommendations
> 2-3 properly measured BP readings
@
> 2-3 of visits after initial screening
Home BP monitoring recommended
Daytime average > 130/80
ABPM= Ambulatory BP monitor //HBPM = Home
Diagnosis of MASKED HTN
when not on drug therapy
Office BP = 120-129 / < 80
after 3months of lifestyle mod & suspected MASKED HTN
Daytime ABPM or HBPM = <130/80mmhg?
- *YES = MASKED HTN**
- -> Lifestyle mods + START ANTI-HT DRUG THERAPY
- *NO = Normal Hypertension**
- -> Lifestyle mods + Annual ABPM or HBPM to detect progression
Diagnosis of WHITE COAT HT
when not on drug therapy
Office BP > 130/80 but <160/100
after 3months of lifestyle mod & suspected WCHT
Daytime ABPM or HBPM = <130/80mmhg?
- *YES = White Coat Hypertension**
- -> Lifestyle mods + Annual ABPM or HBPM to detect progression
- *NO = Normal Hypertension**
- -> Continue Lifestyle mods + START ANTI-HT DRUG THERAPY
When to treat HTN with Pharmacologic Therapy?
(ACC/AHA)
- *ABP > 140/90**
- *Primary prevention = no h/o CVD & ASCVD < 10%**
ABP > 130/80 with:
Secondary Prevention = CLINICAL CVD
Primary Prevention: 10yr ASCVD RISK > 10%
Age / Race / Cholesterol Panel / DM risk / BP meds / STATIN / ASA
Smoking
BP Thresholds & Recommendations
for Treatment + Follow up
ELEVATED BP = 120-129 / <80
Promote optimal lifestyle habits
Non-pharmacologic Therapy
Reassess in:
3-6 MONTHS
BP Thresholds & Recommendations
for Treatment + Follow up
Normal BP = <120/80
Promote optimal lifestyle habits
Reassess in:
1 YEAR
BP Thresholds & Recommendations
for Treatment + Follow up
Stage 1 HTN = 130-139 / 80-89
WITH:
Clinical ASCVDor10yr ASCVD >10%
Promote optimal lifestyle habits
+
BP-LOWERING MEDICATION
Reassess in:
1 MONTH
If BP goal is met –> reassess in 3-6 months
if not –> assess adherence / intensify therapy –> 1 month reassessment
BP Thresholds & Recommendations
for Treatment + Follow up
Stage 1 HTN = 130-139 / 80-89
WITHOUT:
Clinical ASCVD or 10yr ASCVD > 10%
Promote optimal lifestyle habits
Reassess in:
- *3-6 Months**
- same as Elevated BP*
BP Thresholds & Recommendations
for Treatment + Follow up
Stage 2 HTN** = **> 140/90
Promote optimal lifestyle habits
+
BP-LOWERING MEDS
Reassess in:
1 YEAR
If BP goal is met –> reassess in 3-6 months
if not –> assess adherence / intensify therapy –> 1 month reassessment
HTN in Older Adults > 65y/o
Linear increase in Systolic & Diastolic BP until ~50-60y/o
SBP –> continues to RISE
DBP –> gradually trends down
HYVET & SPRINT:
displayed BENEFIT in elderly, only includes COMMUNITY DWELLING
Monitor for:
- *Orthostatic Hypotension**
- *caution for Frequent falls / Cognitive imparment / comorbidities**
Best Proven Nonpharmacological Intervention
for the
Prevention/Treatment of Hypertension
Weight Loss
Heat-Healthy Diet
DASH / mediterranian
↓Na Intake & ↓Alcohol Intake
↑K+ Intake, as long as no CI’s
- ↑*Exercise
- *150 min/wk moderate exercise** // 30 min 5x/wk
Which HTN Drug?
Blockade of sodium reabsorption @distal tubule causing initial volume loss mostly in 1st week
long term CO & volume return closer to baselline while SVR decreases
2/2 Vasodilatory effects
ADR:
Electrolyte abnormalities: hypo-Na/Mg/K – HYPER-Calemia
frequent Urination / GOUT / dehydration / glucose intolerance
- *THIAZIDE_ _DIURETICS**
- *Hydrochlorothiazide, chlorthalidone, indapamide, metolazone**
1st Line Drug
Low dose chlorathalidone (12.5-25mg) preferred thiazide
longer t1/2 & proven CVD reduction
Limitations:
Reduced efficacy with comorbid renal disease
Which HTN Drug?
BLOCK conversion of AT1 –> AT2 = vasodilation / ↓aldosterone
↓Bradykinin metabolism –> ↑Bradykinin –> Vasodilation
ADR:
HYPERKalemia / COUGH
angioedema / nephrotoxicity / pancreatitis
- *ACE INHIBITORS**
- *-prils**
1st Line Drug
ACC/AHA:
CKD Stage 1 or 2 AND albumin:creatinine ratio > 300mg/g or 30-299mg/g creatinine
Or
CKD Stage 3 or 4 // HFrEF // CAD
Limitations:
COUGH –> ARB
Which HTN Drug?
Blockade of sodium reabsorption @distal tubule causing initial volume loss mostly in 1st week
long term CO & volume return closer to baselline while SVR decreases
2/2 Vasodilatory effects
ADR:
Electrolyte abnormalities: hypo-Na/Mg/K – HYPER-Calemia
frequent Urination / GOUT / dehydration / glucose intolerance
- *THIAZIDE_ _DIURETICS**
- *Hydrochlorothiazide, chlorthalidone, indapamide, metolazone**
1st Line Drug
Low dose chlorathalidone (12.5-25mg) preferred thiazide
longer t1/2 & proven CVD reduction
Limitations:
Reduced efficacy with comorbid renal disease
Which HTN Drug?
Blocks actions of AT2
Vasodilation, ↓aldosterone synthesis
ADR:
HYPERKalemia, Nephrotoxicity
angioedema (very rare)
- *ARBs**
- *-sartans**
1st Line Drug
typically for ACE intolerance
ACC/AHA:
CKD Stage 1 or 2 AND albumin:creatinine ratio > 300mg/g or 30-299mg/g creatinine
Or
CKD Stage 3 or 4 // HFrEF // CAD