Cardiovascular System – Heart and Blood Vessels

1. Cardiovascular System – Heart and Blood Vessels Topics in Human Pathophysiology Fall 2011 Gilead Drug Safety and Public Health

2. Outline • Heart • Conduction System and ECGs • Coronary Circulation • Cardiovascular Disease – diagnosis and treatment • Blood Vessels and Pressure • Structure of blood vessels • Blood pressure and regulation • Pulmonary arterial hypertension

3. Figure 8.14

4. ECG Tracings

5. Figure 8.11

6. Ischemic Heart Disease • Coronary artery disease • Myocardial ischemia • Myocardial hypoxia • Myocardial infarct • Myocardial necrosis

7. From wikipedia

8. Risk Factors for Cardiovascular Disease

9. Diagnosis and Treatment of Ischemic Heart Disease • Diagnosis • BP monitoring • Symptoms • ECG • Angiogram • Stress Test • Nuclear myocardial perfusion tests

10. Coronary Angiogram

11. Lexiscan (regadenoson) • For myocardial perfusion imaging (MPI) • A2A adenosine receptor agonist • Vasodilates coronary arteries as if exercising • Injected into blood stream prior to gamma camera scan • Can give a good indication of myocardial perfusion

12. Treatment of Ischemic Heart Disease • Treatment • Coronary bypass surgery • Angioplasty • Stents • Cholesterol lowering agents • Anticoagulents • Antianginal medications

13. Ranexa • For angina • Thought to inhibit a sodium ion channel in the cardiac muscle cells • Contraction of those cells might normally cause compression of cardiac blood vessels during diastole. • Can be taken with other anti-anginal meds • Very effective

14. Congestive Heart Failure

15. Congestive Heart Failure • Heart becomes weak • Blood backs up in veins and capillaries • Fluid excess in tissues • Symptoms include shortness of breath, edema, difficulty breathing (especially when lying down,) difficulty exercising

16. Congestive Heart Failure • Causes: • cardiomyopathy • hypertension • lung disease • coronary artery disease • previous MI • valve disease

17. Blood Vessels and Pressure • Artery structure and function • Control over smooth muscle • Vascular Disease • Atherosclerosis • Pulmonary arterial hypertension

19. Figure 8.10

20. Vessel Wall Structure • Tunica intima – epithelium and connective tissue • Tunica media – smooth muscle • Tunica externa– connective tissue and epithelium

21. Figure 8.1

23. Arterial blood pressure and flow • Systolic and diastolic pressure • Regulatory factors • Cardiac • Sympathetic nervous system from vasomotor center of brain stimulates smooth muscle • Chemical messengers – hormones, paracrines

24. Components of Orthe Nervous System Organization of the Nervous System Figure 11.1

25. Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System Figure 11.12 (1 of 2)

26. Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System Figure 11.12 (2 of 2)

27. Hormonal Control of Blood Pressure Table 19.2

28. Pulmonary Arterial Hypertension

29. Pulmonary Arterial Hypertension (PAH) • Pulmonary arteries become narrowed causing decreased gas exchange and difficulty breathing • Causes R ventricular hypertrophy • Blood will back up in veins

31. Common causes of PAH • Genetic defect • Autoimmune diseases, such as scleroderma • Congestive heart failure • History of blood clot in the lung • HIV infection • Lung or heart valve disease • Obstructive sleep apnea • In many cases the cause is unknown- Idiopathic pulmonary arterial hypertension

32. Symptoms of PAH • Chest pain, usually in the front of the chest • Dizziness • Fainting • Fatigue • Leg edema • Light-headedness during exercise • Shortness of breath during activity • Weakness

33. Treatment for PAH • Letairis (ambrisentan) • Flolan or other prostacyclins • Bosentan (Tracleer) • Calcium channel blockers • Diuretics • Sildenafil (Viagra) • Supplemental oxygen • Surgical correction of defects • Lung transplant