Cardiac Pathophysiology

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1 Cardiac Pathophysiology

2 Evaluation Components Medical history Physical examination Routine laboratory tests Optional tests

3 Medical History Duration and classification of hypertension. Patient history of cardiovascular disease. Family history. Symptoms suggesting causes of hypertension. Lifestyle factors - Ethanol intake. Current and previous medications.

4 Physical Examination Blood pressure readings (two or more). Verification in contralateral arm. Height, weight, and waist circumference. Funduscopic examination. Examination of the neck, heart, lungs, abdomen, and extremities. Neurological assessment.

5 Laboratory Tests Recommended Before Initiating Therapy Urinalysis Complete blood count Blood chemistry (potassium, sodium, creatinine, and fasting glucose) Lipid profile (total cholesterol and HDL cholesterol) 12-lead electrocardiogram

6 Optional Tests and Procedures Creatinine clearance Microalbuminuria 24-hour urinary protein Serum calcium Serum uric acid Fasting triglycerides LDL cholesterol Glycosolated hemoglobin

7 Investigation Urea and electrolytes FBP and ESR ECG Echocardiogram Lipid profile Cardiac enzymes Chest x-ray no longer routinely indicated

8 Hypertension The normal radial artery blood pressures in adults are: Systolic arterial pressure: 100 to 140 mmhg. Diastolic arterial pressure: 60 to 90 mmhg. These pressures are called Normal blood pressure or (normo-tensive pressure). Stage I hypertension: systolic ( mmhg) and/or diastolic (90-99 mmhg). Stage II hypertension: systolic ( 160 mmhg) and/or diastolic ( 100 mmhg).

9 BP = TPR * CO Where, BP: blood pressure; TPR: Total peripheral resistance; CO: cardiac output. Where, CO = SV * HR SV: stroke volume; HR: Heart rate.

10 Types of hypertension: In more than 95% of cases a specific underlying cause of hypertension cannot found. Such patients are said to have (essential hypertension). In reality the problem is probably multi-factorial. Genetic factors and environmental factors including high salt intake, heavy consumption of alcohol, obesity, and impaired intra-uterine growth.

11 About 5% of cases, hypertension shown to be a consequence of a specific disease or abnormality leading to Na retention and/or peripheral vasoconstriction (secondary hypertension).

12 Risk factors 1-Fixed Age, Sex, Family history 2-Variables Obesity, smoking, Diabetes mellitus, High cholesterol

13 The possible causes : A. Alcohol. B. Pregnancy: Pre-eclampsia /eclampsia: pregnancy specific syndrome with elevated blood pressure that occurs after the first 20 weeks of pregnancy and accompanied by protein-uria and edema. C. Renal diseases: Renal vascular disease (renal artery stenosis) and kidney diseases D-Co-arctaion of aorta

14 E. Endocrine diseases: 1.Phaechromocytoma: It is mostly benign tumor of the adrenal medulla with increase secretion of epinephrine and nor-epinephrine, so it causes paroxysmal hypertension but may be persist. 2.Cushing syndrome: elevated level of cortisol has mineralo-corticoid effect. 3.Primary hyperaldosteronism (Conn's syndrome). 4.Thyrotoxicosis: high thyroid hormone associated with increase in systolic pressure due to increase activity of the heart (increase stroke volume and heart rate) and decrease diastolic pressure due to vasodilatation.

15 F. Drugs: example oral contraceptives containing estrogen, corticosteroids,

16 Investigations 1-General Urea and electrolytes FBP Creatinine ECG Echocardiogram Lipid profile Chest x-ray 2-Specific investigations

17 Complications of hypertension

18 A. Central nervous system: Stroke: is common complication of hypertension and may be due to cerebral hemorrhage or infarction. Hypertensive encephalopathy: it is rare condition characterized by high blood pressure and neurological symptoms including transient disturbance of speech and vision, paraesthesiae, disorientation.

19 B. Heart: 1-left ventricular hypertrophy2-atrial fibrillation3-ischemic heart disease (Angina and infarction)4- left ventricular failure and pulmonary edema. C. Kidney: renal disease may result be result of hypertensive damage to renal vessels. Long standing hypertension may cause protein-uria, and progressive renal failure. D. Retina: hypertensive retino-pathy: long standing hypertension results in compensatory thickening of arterial wall, which effectively reduces capillary perfusion pressure. With sudden increase of blood pressure hemorrhage is likely to occur.

20 E. Malignant or accelerating hypertension in young age: This rare complicate hypertension of any etiology and is characterized by accelerated micro-vascular damage with necrosis in the wall of small arteries and arterioles (fibrinoid necrosis) and intra-vascular thromosis. The diagnosis is based on evidence of high blood pressure and rapidly progressive end-organ damage such as retinopathy, renal failure and/or hypertensive encephalo-pathy. Left ventricular failure may occur, and if this is untreated, death occurs within months.

21 Prevention Weight reduction and regular aerobic exercise (e.g., walking): Reducing dietary sugar. Reducing sodium (salt) in the body Additional dietary changes beneficial to reducing blood pressure include the DASH diet (dietary approaches to stop hypertension) Discontinuing tobacco use Limiting alcohol intake Reducing stress, for example with relaxation therapy,

22 Treatment Lifestyle modifications Lose weight if overweight Limit alcohol Increase physical activity Decrease sodium intake Keep potassium intake at adequate levels Take in adequate amounts of calcium and magnesium Decrease intake of saturated fat and cholesterol Stop smoking

23 Thiazide diuretics. Diuretics, sometimes called "water pills," are medications that act on your kidneys to help your body eliminate sodium and water, reducing blood volume. Thiazide diuretics are often the first but not the only choice in high blood pressure medications.

24 Beta blockers. These medications reduce the workload on your heart and open your blood vessels, causing your heart to beat slower and with less force..

25 Angiotensin-converting enzyme (ACE) inhibitors. These medications help relax blood vessels by blocking the formation of a natural chemical that narrows blood vessels.

26 Calcium channel blockers. These medications help relax the muscles of your blood vessels. Some slow your heart rate.

27 Vasodilators. These medications work directly on the muscles in the walls of your arteries, preventing the muscles from tightening and your arteries from narrowing.they are used only in the hospital

28 Orthostatic (or postural) hypotension (a fall in blood pressure of 20/10 mmhg from lying to standing position): 1.It is an abnormal drop in blood pressure on assumption of standing position. It is caused by: 1. Reduced blood or fluid volume: as in excessive use of diuretics, loss of GIT fluid (diarrhea and vomiting), and loss of fluid in prolong bed rest. 2. Drugs induce hypotension: anti-hypertensive drugs and psychotropic drugs. 3. Aging: weakness and dizziness on standing are common complaints of elderly persons. Postprandial (after meal) blood pressure often decreases in elderly persons especially after a high-carbohydrate meal.

29 4. Bed rest and immobility: Prolonged bed rest promotes a reduction in plasma volume, a decrease in venous tone, failure of peripheral vasoconstriction, and weakness of skeletal muscles that support the veins and assist in returning blood to the heart. 5. Disorder of autonomic nervous system function:

Hypertension The normal radial artery blood pressures in adults are: Systolic arterial pressure: 100 to 140 mmhg. Diastolic arterial pressure: 60 to

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