Complex Care Session 8: Endocarditis, Pericarditis, and valvular diseases.

Session 8: Infective endocarditis, pericarditis, and valvular diseases.

 

Valvular diseases:

  • Mitral Valve stenosis: valve leaflets fuse together and cause a decrease in the blood flow across the valve. Most commonly caused by rheumatic heart disease.
    • Diastolic murmur, loud S1, exertional dyspnea, palpitations, and fatigue.   
  • Mitral Valve regurgitation: incomplete closure of the valve leaflets causing blood to flow backward from the left ventricle to the left atrium. caused by Rheumatic heart disease, endocarditis, cardiomyopathy, and issues with the chordae tendinea
    • s/s: systolic murmur, pulmonary edema, cardiogenic shock
  • Aortic Valve Stenosis: Stenotic valve between the aorta and the Left Ventricle.
    • Systolic murmur, Soft S1,S2, and impressive S4
    • s/s: Angina, Syncope, dyspnea on exertion.
    • The aortic valve has two “os” (openings to the coronary arteries) that feed the coronary arteries.
  • Aortic Valve Regurgitation: Floppy valve causing backflow from the Aorta to the LV.
    • Diastolic murmur
  • Treatment: Lower BP and increase CO
    • Meds: vasodilation(nitro), positive inotropes (digoxin), Diuretics, Anticoagulation, antiarrhythmics, beta blockers,

 

  • Endocarditis: Infection of the endocardium usually the heart valves.
    • Strep viridans and staph aureus are the most common types.
    • Effects Left heart 90% of the time, and usually the mitral valve.
    • s/s: new murmur or change in existing murmur, Fever,
    • Embolization of a portion of the vegetation: Thrombotic stroke from a vegetation embolus of the bacteria, micro emboli in Kidneys extremities and spleen if the infection is originating on the right side of the heart. If originating on the left side of the heart pulmonary issues are a risk factor.
    • Right valves are effected at the lower percentage and are correlated with IV drug use.
    • Subacute: Slow and long course, patient usually has a pre-existing heart valve issue.
    • Acute: faster progression of the illness, may not have a pre-existing heart valve issue,
    • Risk factors: Cardiac conditions, artificial heart valve, IV drug abuse, Bacteremia, Intravascular devices,

 

  • Pericarditis: inflammation of the pericardium, the sac surrounding the heart.
    • Normal fluid around heart is 15-30ml
    • Increased chest pain with inspiration
    • due to: infection, uremia, acute MI, Trauma, Dissecting AA, Auto immune, Rheumatic diseases, and some medications.
    • s/s:ST elevation on all leads, Echocardiogram to see thickness of pericardial tissue, chest x-ray will show large cardiac shadow, Pericardial tamponade,
    • Pulsus paradoxus – an exaggerated decrease in Blood pressure upon inspiration, greater than 10 mmhg. (you need an arterial line to monitor this.)  
      • This is caused by cardiac tamponade, the fluid that builds up in the pericardium causes pressure changes that decrease the stroke volume of the left ventricle. The right ventricle presses the septum towards the left ventricle causing decreased stroke volume.

 

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