This document provides an overview of essential hypertension including its definition, classifications, causes, detection, importance, prevention, management, goals of treatment, classes of drugs and their side effects, and specific management for patients with ischemic heart disease or diabetes. Essential hypertension is high blood pressure where secondary causes are not identified, accounts for 95% of hypertension cases, and needs to be further classified. Lifestyle modifications and pharmacologic treatments can help control blood pressure to reduce health risks.
4. Definition of essential
hypertension
Essential, primary, or idiopathic hypertension
is defined as high BP in which secondary
causes such as Reno vascular disease, renal
failure, aldosteronism, or other causes of
secondary hypertension or mendelian forms
(monogenic) are not present.
5. Essential hypertension accounts for 95% of all
cases of hypertension.
Essential hypertension is a heterogeneous
disorder, with different patients having
different causal factors that lead to high BP.
Essential hypertension needs to be separated
into various syndromes because the causes of
high BP in most patients presently classified as
having essential hypertension can be
recognized.
6. Detection
Hypertension is diagnosed when
systolic blood pressure is consistently equal to or
more than 140 mm Hg,
or diastolic blood pressure is equal to or more than
90 mm Hg;
a single elevated blood pressure reading is not
sufficient to establish the diagnosis of hypertension.
8. Detection
Blood pressure should be measured with a well-
calibrated sphygmomanometer.
The bladder length within the cuff should encircle
at least 80% of the arm circumference.
Readings should be taken after the patient has
been resting comfortably, back supported in the
sitting or supine position, for at least 5 minutes and
at least 30 minutes after smoking or coffee
ingestion.
10. Importance
Sixty-six million Americans have elevated
blood pressure.
The prevalence of hypertension increases
with age and is more common in blacks
than in whites.
Cardiovascular morbidity and mortality
increase as both systolic and diastolic
blood pressures rise.
12. Prevention
-1 Maintaining a healthy diet
a. Reduction of dietery sodium (salt) intake.
b. Minimizing saturated fat and cholestrol
intake
c. Including fresh fruits and vegetables in
every day meals.
13. Prevention
-2 Maintaing a healthy weight.
Being overweight can raise BP and losing
weight can lower BP.
14. Prevention
-3 Physical activity.
An average of 2 hours and 30 minutes of
moderate-intensity exercise weekly is ideal
for preventing hypertension.
15. Prevention
-4 Cessation of smoking
Smoking decreases the elasticity of the
blood vessels and increase blood vessel
resistance which causes hypertension.
16. Prevention
-5 Limitation of alcohol intake .
Heavy drinkers who cut back to moderate
drinking can lower their systolic blood
pressure by 2 to 4 (mm Hg) and their
diastolic blood pressure (by 1 to 2( mm Hg.
23. Its classified into 4 categories:
1. Chronic hypertension.
2. Gestational hypertension.
3. Preeclampsia.
4. Preeclampsia superimposed on chronic
hypertension.
24. 1)Chronic hypertension
Blood pressure is defined as BP exceeding 140/90
mm Hg before pregnancy or before 20 week’s
gestation.
When hypertension is first identified during
pregnancy and she is at less than 20 weeks gestation,
blood pressure evaluation usually represent chronic
hypertension.
25. 2)Gestational hypertension:
Refers to hypertension onset in the latter part of
pregnancy >20 weeks without any other features of
preeclampsia and normalization of the BP
postpartum .
Pathophysiology is still unknown.
Maternal and fetal outcome are usually normal.
26. Gestational hypertension can
develop either of on of these four :
Preeclampsia (gestation
hypertension + protein urea)
Acute fatty liver of pregnancy.
HELLP syndrome (hemolysis +
elevated liver enzymes + low
platelets )
eclampsia (gestation
hypertension + protein urea +
tonic-colonic seizure )
27. 3) preeclampsia
Preeclampsia is a disorder of widespread
vascular endothelial malfunction and
vasospasm that occurs after 20 weeks'
gestation and can present as late as 4-6
weeks’ postpartum. It is clinically defined
by hypertension and proteinuria, with or
without pathologic edema
28. Risk factors
Maternal RF
1. Women first pregnancy
(primigravida)
2. Age younger than 18 or
above 35
3. History of preeclampsia
4. Family history
5. Obesity
Maternal medical RF
1. Chronic hypertension
especially when its 2ndary
(hyperaldostronisim ,
hypercortisolism)
2. Preexisting diabetes (I or II)
3. History of migraine
4. Use of SSRI beyond 1st
trimester.
29. Symptoms of preeclampsia
1. Visual disturbance.
2. Headache (women describe it as throbbing)
3. Epigastric pain or RUQ (due to hepatic swelling ).
4. Retinal vasospasm (if severe)
5. Hyperactive reflexes (severe stage)
6. On auscultation the presence of S4 suggests LV
Hypertrophy or diastolic dysfunction.
New seizures in pregnancy suggest preeclampsia-
eclampsia .
31. Management
Current control rates (SBP <140 mmHg
and DBP <90 mmHg).
In the majority of patients, reducing SBP
has been considerably more difficult than
lowering DBP.
the majority will require two or more
antihypertensive drugs
32. Goals of treatment
reduce cardiovascular and renal
morbidity and mortality.
Treating SBP and DBP to targets that are
<140/90 mmHg is associated with a
decrease in CVD complications.
In patients with hypertension and
diabetes or renal disease, the BP goal is
<130/80 mmHg
33. Management of HTN
Adoption of healthy lifestyles by all
persons is critical for the prevention of
high BP.
Two types of management:
1) Lifestyle modification.
2) Pharmacologic Treatment.
36. Classes of drugs & side effects
More than 2/3 of hypertensive individuals
cannot be controlled on one drug and
will require two or more antihypertensive
agents selected from different drug
classes.
Mild Hypertension can be often controlled
with a single drug.
37. Classes of drugs & side effects
Cardiac output & peripheral resistance controlled by
two mechanism:
1) Baroreflexes.
2) Renin-angiotensin-aldosterone system.
40. Diuretics
tx: mild to moderate HTN
First drug of treatment
Also tx. heart failure or kidney disease
Used with other antihypertensives to
enhance effectiveness
Reduce edema assos. with CHF
43. Diuretics
Action
Reduce blood volume
through urinary excretion of
water and electrolytes
Electrolyte imbalances
can occur (mainly
hypokalemia)
Also, Hyperglycemia,
Hyperuricemia,HyperCa
44. Side effects
Orthostatic hypotension
Dry mouth,irritation
Disorientation
Dehydration
HyperK: with K sparing
Gynecomastia
45. Angiotensin-Converting
Enzyme Inhibitors
“ACE” inhibitors
Mainstay of oral vasodilator therapy
More effective when used with diuretics
First line of therapy if the Diuretics or betaB
are contraindicated.
49. Side effects
Headache
Orthostatic hypotension-infrequent
dry Cough
Hyperkalemia
AKF
Skin rash
Are fetotoxic & should not be used in pregnancy.
50. Drug interactions
Diuretics specially K sparing
Alcohol
Beta-blockers
All the above enhance the effects
It’s standerd in the care of patient
following a myocardial infarction
51. Angiotensin 2 Receptor
antagonists
Alternative of ACE I .
Same effect to ACE I .
Produce arteriole and venous dilatation .
Inhibit aldosterone secretion.
53. Calcium Channel Blockers
Emerged as major drug to tx. HTN when the
preferred first line are contraindicated.
Used for arrythmias also
Alternative to B-blocker (hx. Asthma)
Avoid High dose of SA. CCB because of inc.
risk of Myocardial infarction.
59. Beta Adrenergic Blocking
Agents
Known as Beta-blockers
Axn: Inhibit cardiac response to
sympathetic nerve stimulation by
blocking Beta receptors
Decreases heart rate and C.O.
Decreases blood pressure
First line of therapy in HF
63. Alpha-1 adrenergic
blockers
Alternative if B-blockers and diuretics do
not work
Also used to tx. mild to mod. urinary
obstructive dx.
Also used for treat of benign prostate
hyperplasia
64. Alpha-1 Adrenergic Blocking
Agents
Action
Block postsynaptic alpha-1 adrenergic
receptors to produce arteriolar and
venous vasodilation
Reduces peripheral-vascular resistance
70. Case study
55 year old man known case of IHD and he
now diagnosed with HT what is the drug of
choose to treat him?
1-BB
2-ACEI
3-CCB
71. Hypertensive patients are at increased risk
for MI or other major coronary events Why?
1-increase in heart o2 demand
2- increase heart work (life ventricle
hypertrophy)
If the patient have HT and IHD that even
increase the risk more
72. Stable angina and silent ischemia
BBs (propranolol) will lower BP; reduce
symptoms of angina; improve mortality; and
reduce cardiac output heart rate, and AV
conduction
Treatment should also include smoking
cessation, management of diabetes, lipid
lowering, antiplatelet agents, exercise training
and weight reduction in obese patients.
73. If angina and BP are not controlled by BB
therapy alone, or if BBs are contraindicated,
as in the presence of severe reactive airways
disease, severe peripheral arterial disease,
high-degree AV block,or the sick sinus
syndrome
Use dihydropyridine or nondihydropyridine
type CCBs (amlodipine Verapamil)
74. If angina or BP is still not controlled on this
two-drug regimen, nitrates can be
added, but these should be used with
caution in patients taking
phosphodiesterase-5 inhibitors such as
sildenafil. Short-acting dihydropyridine
CCBs should not be used because of their
potential to increase mortality,particularly
in the setting of acute MI.
75. Diabetes and HT
The combined unadjusted prevalence of total
diabetes and impaired fasting glucose in those
over age 20 is 14.4 percent and is the leading
cause of blindness, ESRD, and nontraumatic
amputations
The United Kingdom Prospective Diabetes Study
(UKPDS)174 demonstrated that each 10 mmHg
decrease in SBP was associated with average
reductions in rates of diabetes-related mortality
(15 percent), myocardial infarction (11 percent)
76. American Diabetes Association
recommended that BP in diabetics be
controlled to levels of 130/80 mmHg or lower
ACEIs(captopril), BBs(propranolol),
ARBs(valsartan), and calcium
antagonists(Verapamil) have a demonstrated
benefit in the treatment of hypertension in
both type 1 and type 2 diabetics
77. The question of which class of agent is
superior for lowering BP is somewhat moot
because the majority of diabetic patients
will require two or more drugs to achieve
BP control
78. The ADA has recommended ACEIs for diabetic
patients older than 55 years of age at high risk for
CVD, and BBs for those with known CAD
showed a reduction in combined MI, stroke, and
CVD death of about 25 percent and a reduction
in stroke by about 33
the ADA has recommended both ACEIs and
ARBs for use in type 2 diabetic patients with CKD
79. BB is indicated in a diabetic with IHD but may be
less effective in preventing stroke than an ARB as
was found in the LIFE study
CCBs may be useful to diabetics, particularly as
part of combination therapy to control BP
The Appropriate Blood Pressure Control in
Diabetes (ABCD) Trial in diabetics was stopped
prematurely when it was found that the
dihydropyridine nitrendipine was inferior to lisinopril
in reducing the incidence of ischemic cardiac
events.
80. Hypertensive emergencies
Hypertensive emergencies are characterized by
severe elevations in BP (>180/120 mmHg)
complicated by evidence of impending or
progressive target organ dysfunction
Patients with hypertensive emergencies should be
admitted to an intensive care unit for continuous
monitoring of BP and parenteral administration of
an appropriate agent
81.
82.
83. The initial goal of therapy reduce mean
arterial BP by no more than 25 percent
(within minutes to 1 hour)
then if stable, to 160/100–110 mmHg
within the next 2–6 hours
84. Excessive falls in pressure that may
precipitate renal, cerebral, or coronary
ischemia should be avoided. For this
reason, short-acting nifedipine is no longer
considered acceptable
further gradual reductions toward a
normal BP can be implemented in the
next 24–48 hours
Weight reduction : (body mass index 18.5–24.9 kg/m2).
Adopt Dietary Approaches to Stop Hypertensioneating plan : Consume a diet rich in fruits, vegetables, and lowfat dairy products with a reduced content of saturated and total fat.
Dietary sodium reduction : reduce it to more than 100 mmol per day
Physical activity : brisk walking (at least 30 min per day, most days of the week).
Smoking and alchol.
Factors influence HTN
Myocardial infarction due to excessive vasodiltaion.
nonDih: heart / Verapamil & Diltizam (used in angina )
Dih: Vessels : vascular smooth muscle to relax.
Inotopic: contractility
Dromotopic: conductivity
Hydralazine (cause lupus like syndrome)
Minoxidel ( treat baldness)
