Hypertension Definition, Signs And Symptoms, Causes And Risk Factors

BP measuring


Blood pressure checking

Image source: Hypertension Checker sphygmomanometer


Hypertension is circulatory strain raised enough to perfuse tissues and organs.Elevated systemic blood pressure is usually defined as a systolic reading ≥140 mm Hg and a diastolic reading ≥90 mm Hg (≥140/90 mm Hg). The “7th Joint National Committee on Detection, Evaluation, and Treatment of High Blood Pressure” (JNC-7) added a “prehypertension” category that includes individuals with systolic blood pressure readings of 120 to 139 mm Hg or diastolic blood pressure readings of 80 to 89 mm Hg; this category is now included in contemporary management strategies.

Signs &symptoms:-

Most patients are asymptomatic and most people with high pressure level won’t expertise any symptoms. People often call hypertension the “silent killer” for this reason.

∗Severe headache

∗Fatigueor confusion


∗Chest pain

∗Difficulty breathing

∗Uneven heartbeat

∗Blood in the urine




∗Short ness of breath

∗Nose bleeds

Causes of hypertension:-

Primary hypertension (90–95%)

Essential hypertension

Secondary hypertension (5–10%)


Chronic kidney disease

Cushing’s syndrome

Coarctation of the aorta

Obstructive sleep apnea

Parathyroid disease


Primary aldosteronism

Renovascular disease

Thyroid disease

Drugs Associated with Hypertension in Humans Prescription drugs:-

Adrenal steroids (e.g., prednisone, fludrocortisone, triamcinolone)

Amphetamines (e.g., phendimetrazine, phentermine, sibutramine)

Antivascular endothelin growth factor agents (bevacizumab sorafenib, sunitinib),

estrogens (usually oral contraceptives)

Calcineurin inhibitors (cyclosporine and tracolimus)

»Decongestants (phenylpropanolamine and analogs)

»Erythropoiesis stimulating agents (erythropoietin and darbepoietin)

»Nonsteroidal anti-inflammatory drugs, cyclooxygenase-2 inhibitors

»Others: venlafaxine, bupropion, buspirone, carbamazepine, clozapine, desulfrane, ketamine, metoclopramide.

Street drugs and other natural products:-

Cocaine extraction  Ephedra alkaloids (e.g., Ma-Huang),  herbal other phenylpropanolamine analogs Nicotine withdrawal, anabolic steroids, narcotic, methylphenidate, phencyclidine.

Food substances:-




Risk Factors:-

»Cigarette smoking.

»Physical inactivity.

»Diabetes mellitus.

»Micro albuminuria.

»Family history of early cardiovascular disease (men<55 years; women<65 years).

»Use Tobacco.

»High dietary intake of saturated fats or sodium.

»Sedentary lifestyle.

High Blood Pressure During Pregnancy:-


»Chronic high blood pressure


»Kidney disease


»In- vitro fertilization (IVF)

Complications of hypertension:-

»Myocardial infarction


»Cerebral/brainstem infarction

»Cerebral haemorrhage

»Lacunar syndromes

»Multi-infarct disease

»Hypertensive encephalopathy/malignant hypertension

»Dissecting aortic aneurysm

»Hypertensive nephrosclerosis

»Peripheral vascular disease.


Adults≥18 years of age

Hypertension classification

New Blood Pressure Categories for Adults:-

New Hypertension classification

Primary (or essential) hypertension:- in which no particular cause can be recognized, organizes >90% of all cases of systemic hypertension. The average age of onset is about 35 years.

Secondary hypertension:-causing from an recognizable cause, such as renal disease or adrenal hyper function, accounts for the remaining 2% to 5% of cases of systemic hypertension. This type usually develops between the ages of 30 and 50.


Over 90% of persons with hypertension have essential hypertension (primary hypertension) Frequent mechanisms have been recognized that may contribute to the pathogenesis of this form of hypertension, so classifying the exact underlying abnormality is not possible.

Hypertension often runs in families, indicating that genetic factors may play a main role in the expansion of essential hypertension.

Data suggest that there are monogenic and polygenic forms of BP deregulation that may be responsible for essential hypertension.

A large number of these hereditary characteristics include qualities that pain sodium balance, however hereditary changes adjusting urinary kallikrein end, nitric oxide discharge, aldosterone discharge, other adrenal steroids, and angiotensinogen are likewise acknowledged.

In the future, identifying persons with these genetic traits might lead to another ways to deal with avoiding or treating hypertension anyway this isn’t presently suggested.


Under 10% of patients have optional hypertension where whichever a comorbid ailment or then again drug is responsible for lifting BP In by far most of these cases, renal brokenness coming to fruition from extreme chronic kidney disease or Reno vascular disease is the most common secondary cause.

Convinced drugs, whichever directly or indirectly, can cause hypertension or exacerbate hypertension by increasing BP lists the most common agents. Some of these agents are herbal products.

Although these are not technically drugs, they have been identified as secondary causes. When a secondary cause is recognized, removing the offending agent (when feasible) or handling/correcting the underlying comorbid complaint should be the first step in management.

Hypertensive urgency:-

»When blood pressure spikes- BP reading at 180/110 or higher.

»But there’s no damage to the body organs.

»Blood Pressure can be brought down safely within few hours with BP medications.

Note: No signs& Symptoms.

Hypertensive Emergency:-

»When blood pressure spikes- BP reading at ≥180 mmHg/≥110-120 mmHg.

»Well-known as malignant hypertension is high blood pressure with possibly Life-threatening signs & symptoms indicative of acute impairment of one or more organ systems mainly- (Central nervous system, Cardio vascular system, or Kidneys).

Ambulatory and Self Blood Pressure Monitoring:-

Twenty-four-hour wandering BP observing can report BP at successive time interims for the duration of the day.

Wandering BP values for the most part are lower than facility estimated values since hypertensive patients have normal qualities more noteworthy than 135/85 mm Hg during the day and more prominent than 120/80 mm Hg during rest.

Home BP estimations are gathered by patients, ideally toward the beginning of the day, utilizing home checking gadgets.

Both of these might be justified in patients with suspected white coat hypertension to separate white coat from basic hypertension.

In addition, walking BP observing might be useful in patients with evident medication encounter, hypotensive manifestations while on antihypertensive treatment, sporadic hypertension, and autonomic brokenness


Numerous elements that control BP are potential contributing segments in the improvement of hypertension.

 BP= (stroke volume x heart rate) x total peripheral vascular

            Resistance (TPR)

hypertension blood pressure regulation:-

hypertension blood pressure regulation

Image source: Hypertension Pathophysiology

Sympathetic nervous system:-

Baroreceptors (pressure receptors) in the carotids and aortic arch react to variations in blood pressure and stimulus arteriolar expansion and arteriolar choking.

»When stimulated to constrict, the contractile force strengthens, increasing the heart rate and enlarging peripheral conflict, thus aggregate cardiac output.

»If pressure remains elevated, the baroreceptors reset at the higher levels and sustains the hypertension.

»Little evidence to date suggests that epinephrine and norepinephrine, two major neurotransmitters of the sympathetic nervous system, have a clear role in the cause of hypertension.

»However, many of the drugs used to treat hypertension lower blood pressure by blocking the sympathetic nervous system.

Renin–angiotensin–aldosterone system:-

Sympathetic stimulation, renal artery hypotension, and reduced sodium delivery to the distal tubules stimulate the release of renin by the kidney ( juxtaglomerular apparatus of the kidney).

»Renin (an enzyme) reacts with a circulating substrate, angiotensinogen, to produce angiotensin I (a weak vasoconstrictor).

»Within the pulmonary endothelium is another enzyme, referred to as angiotensin-converting enzyme (ACE), which is able to hydrolyze the decapeptide angiotensin I to form the octapeptide angiotensin II (a potent natural vasoconstrictor).

»Angiotensin II has several important functions in the regulation of fluid Volume.

Mosaic theory:-

centers around the fact that multiple factors, rather than one factor alone, are responsible for sustaining hypertension.

»The interactions among the sympathetic nervous system, renin–angiotensin–aldosterone system, and possible defects in sodium presence within andOutdoor the cell may all play a character in long-term hypertension.

Additional factors contributing to the development include genetics, endothelial dysfunction, and neurovascular anomalies.

»Other vasoactive substances that are involved in the maintenance of normal blood pressure have also been identified; these include nitric oxide (vasodilating factor), endothelia ( vasoconstrictor peptide), bradykinin (potent vasodilator inactivated by ACE), and atrial natriuretic peptide ( naturally occurring diuretic).

Fluid volume regulation:-

Increased fluid volume increases venous system distention and venous reoccurrence, distressing cardiac output and tissue perfusion.

»These changes alter vascular resistance, increasing the blood pressure.

Hypertension Diagnosis, Treatment And Life Style Changes


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