S.Moradmand MD. SYSTEMIC HYPERTENSION
Dec 27, 2015
S.Moradmand MD.
SYSTEMIC HYPERTENSION
DEFINITION:
A level of blood pressure that is associated With increased morbidity & mortality
At some future time when compared With the whole population
BP Range mm Hg Category
DBP <85 Normal BP85 – 89 High normal BP90 – 104 Mild hypertension105 – 114 Moderate hypertension>115 Severe hypertension SBP when DBP<90mm Hg < 140 Normal BP 140 – 159 Borderline isolated systolic hypertension >160 Isolated systolic hypertension
CLASSIFICATION of BLOOD PRESSURE
Normal <130 <85
High Normal 130-139 85-89
Hypertension Stage 1(Mild) 140-159 90-99 Stage 2(Moderate) 160-179 100-109 Stage3(Severe) 180-209 110-119 Stage4(Very severe) >210 >120
Category Systolic Diastolic
5
Guidelines
The Seventh Report of the Joint National Committee on Detection, Evaluation, and Treatment of High Blood Pressure (JNC VII) uses the following guidelines to define HTN in adults: (Brashers, 2006, p.1)
Category Systolic Diastolic
Normal <120 and <80Pre-hypertension 120-139 or 85-89
Stage 1 hypertension
140-159 or 90-99
Stage 2 hypertension
>160 or >100
Pulse Pressure: Systolic minus Diastolic Presurre
Mean BP = DP + 1/3 Pulse Pressure
( A good indicator of tissue perfusion)
Angiotensinosion
Angiotensin 1
Angiotensin 2
Angiotensin3
Renin Renin Release
B-blocker
Coverting Enzyme
ACEIReceptor
Antagonist
Angiotensinases
Persistently raisedClinic BP
Target organ damage
Home BP
Ambulatory BP
Continue to monitorClinic & home BP
StartTreatment
yes
high
high
Systolic Pressure
1.Stroke volume
2.The velocity of ejection
3.The elastic properties of aorta
Diastolic Pressure
1.Competency of aortic valve
2.The condition of arteries & their ability to stretch & store energy
3.Resistance of arterioles
Blood PressureCardiac output X Peripheral resistance
cardiac
HR contractility
RenalFluid volume
humoral
sympathethic
local
Dilator (beta)
Constictor ( Alpha)
VasodilatorProstaglandins
VasoconstrictorsAngiotensin-endothelinn
classification1. Essential HTN
2. Renal HTN
92-94%
ParanchymalRenovascular
3.Endocrine HTN Primary Hyperaldostronism Cushing’s syndrome Pheochromocytoma OCP
Essential HTN
HerediteryEnviromentalSalt sensitivity High renine Low renine NonmodulatingCell membrane defectInsulin resistance
Renin Release control
1. Blood volume , Renal perfusion
2. Na filtrated to Macula Densa
3. Sympathetic nervous system
4. Dietary Potassium
Low renin HTN
1. 20% of patients2. Increased extracellular volme3. On high sodium diet mild degree of hyperaldostronism4. Increased sensitivity of adrenal cortex to angiotensin II
Nonmodulating Essential HTN
1. Adrenal defect apposite to low renin2. 25-30% of patients 3. Normal or high renin4. Na intake dosen’t modulate adrenal or renal response5. Corrected with ACEI
Cell Membrane Defect Abnormality in Na transport
Calcium accumulation inVascular smooth muscle cells
Increased vascular reactivity to Vasoconstrictor agents
Calcium in HTN
1. Low ca++ intake increase BP
2. Ca++ blockers are effective antihypertensives
3. Salt loading increase NF
4. Digital sensitive Na-K ATPase lead to intracellular calcium accumulation
Insulin Resistanse
1. Increased sympathetic activity
2. Vascular smooth muscle hypertrophy
4. Increase cytosolic calcium
Natural hx of HTN
1.Progressive & lethal if untreated2.Shortening of life 10-20 years3.If untreated in 7-10 years develope 30 % athersclerosis, 50% CHF, Cardiomegaly ,CVA, Renal insufficeincy & retinopathy.4.Morbid Cardiovascular events by as much as 20 fold
Hx., Ph.E., Lab. Tests1. Uncovering secondary HTN
2. Establishing a pretreatment baseline
3. The factors that may influence therapy
4. Determining if target organ damage?
5.Determining if other CAD risk factors?
Renal Paranchymal HTN
1. Volume expansion
2. Renin-Angiotensin system
3. Unidentified pressure agent
4.Fail to produce vasodilator substance
5. Fail to inactivate vasopressores
Endocrine HTN
1.Aldostronism2.Cushing Sndrome3.Adrenogenital Syndrome4.Pheochromocytoma5.Acromegaly6.Hypercalcemia7.Oral contraceptives
Oral Contraceptives
1. Estogen stimulate hepatic angiotensinogen
2. 5% increase BP
3. Familial Factors
4. Age over 35
5. Obesity
Symptoms & Signs
1.Elevated pressure itself headache,dizziness,palpitation, easy fatigability2.Hypertension vascular disease: epistaxis,hematuria,TIA,angina,dyspnea3.Underlying disease in secondary HTN: polyuria & polydipsia,…4.Most patients are asymptomatic
Factors indicating adverse prognosis1. Black race 2. Youth age3. Male4. Persistent diastolic pressure >115 mmhg5. Smoking6. Diabetes Mellitus7. Hypercholesterolemia8. Obesity9. Excess alcohol intake10.Evidence of End Organ Damage
Manifestation of Target Organ Disease
1.Cardiac :CAD LVH Cardiac Failure
2.Cerebrovascular:TIA / CVA
3.Peripheral Vascular
4.Renal
5.Retinopathy
InfarctionHemorrhageEncephalopathy
Medical Therapy
1.DIURETICS
2.ACEI
3.BETA-BLOCKERS
4.CALCIUM BLOCKERS
Drugs used in Emergency HTN
1.Hydralazine2.Minoxidil3.Diazoxide4.Nitroprusside
Basis of Treatment
Salt restriction Na intake <100mm
Relaxation Reduce sympathetic
Weight loss Diet /Exercise
Exercise Aerobic
Basic Tests for EvaluationUrinalysisCBC(Hct)Na-KCreatinine/BUNEKGFBS-Cholestrol(LDL-HDL)-TGCa++-Phosphate-Uric AcidChest-X-Ray / Echocardiogram
Coarctation of Aorta
Diminished or delayed Femoral Pulses
Rib notching on chest-X-Ray
PheochromocytomaUnusual lability of BPSymptomatic Paroxysm of HTNSpell of Pallor Palpitation Perspiration HeadacheHypertensive reaction to G/A or antihypertensive drugs
Renovascular HTN1. Age under 302. DBP > 120 mmHg3. Continuous bruit in epigasrium or flanks4.Accelerated HTN5.Hx. Of flank pain,hematuria or renal truma6.palpable kidney
7.HTN resistant to treatment
Conn’s Syndrome
1.Serum potassium less than 3.6
2.Urinary Potassium more than 30/24h in the absence of diuretic therapy
Isolated Systolic HTNA.Decreased aortic compliance as in arteriosclerosisB.Increased stroke volume 1-AI 2-Thyrotoxicosis 3-Hyperkinetic heart syndrome 4-Fever 5-AVF 6-PDA