Heart transplantation pathophysiology: Difference between revisions
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==Microscopic Pathology== | ==Microscopic Pathology== | ||
=== Pre-transplantation or Recipient Heart=== | |||
*Hypertrophy of myocytes | |||
*Myofibrillar loss | |||
* Sarcoplasmic vacuolation | |||
*Interstitial fibrosis | |||
*Deposition of collagen, mostly in the subendocardial region. | |||
* Variable degree of myocarditis | |||
==References== | ==References== | ||
Revision as of 20:25, 22 June 2020
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Heart transplantation Microchapters |
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Heart transplantation pathophysiology On the Web |
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American Roentgen Ray Society Images of Heart transplantation pathophysiology |
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Risk calculators and risk factors for Heart transplantation pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
The pathogenesis leading to a cardiac transplant involves the mechanisms leading up to heart failure. The pathophysiology of [disease/malignancy] depends on the histological subtype.
Pathophysiology
Pathogenesis
Cardiac Transplantation is the treatment for patients with intractable heart failure, not amenable to medical and device therapy.
- Heart failure is a complex syndrome whereby there is an inadequate output of the heart to meet the metabolic demands of the body. Heart failure is caused by abnormal function of different parts of the heart including the pericardium, the myocardium, the endocardium, the heart valves and the great vessels.
- Heart failure is characterized by decreased cardiac output but not necessarily decreased ejection fraction.
- Symptoms of heart failure are due to a lack of both forward blood flow to the body, and backward flow into the lungs. The body tries to compensate for the low cardiac output by mechanisms that increase the preload and afterload. These mechanisms lead to exacerbation of the cardiac malfunction and symptoms associated with heart failure.
It is understood that heart failure is the end result of many causes- Common causes and indications that result in the need for cardiac transplantation may include:[1]
- Systolic Heart Failure with a low Left Ventricular Ejection Fraction( <35%) may be caused by
- Ischemic cardiomyopathy
- Dilated cardiomyopathy
- Valvular heart disease
- Hypertensive heart disease
- Ischemic Coronary Artery Disease with Refractory Angina
- Long-standing Intractable life-threatening Arrhythmias
- Ventricular arrhythmias
- Cardiomyopathies
- Restrictive and Hypertrophic Cardiomyopathies
- Non-dilated cardiomyopathies
- Congenital Heart Disease
- Many congenital heart defects that are not amenable to surgery lead to New York Heart Association functional class IV Heart Failure
Gross Pathology
Pre-transplantation or Recipient Heart
On gross pathology, features of chronic heart failure are seen-
- Biventricular hypertrophy
- Moderate to severe four-chamber dilatation are characteristic findings
- Remnant scars from previous myocardial infarctions- transmural or subendocardial
Microscopic Pathology
Pre-transplantation or Recipient Heart
- Hypertrophy of myocytes
- Myofibrillar loss
- Sarcoplasmic vacuolation
- Interstitial fibrosis
- Deposition of collagen, mostly in the subendocardial region.
- Variable degree of myocarditis
References
- ↑ Mehra MR, Canter CE, Hannan MM, Semigran MJ, Uber PA, Baran DA; et al. (2016). "The 2016 International Society for Heart Lung Transplantation listing criteria for heart transplantation: A 10-year update". J Heart Lung Transplant. 35 (1): 1–23. doi:10.1016/j.healun.2015.10.023. PMID 26776864.