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RADIOLOGY Cardiovascular System Lec. II
Heart  Diseases *  Evidence of heart diseases is given by  : 1- Size & shape of the heart. 2- Pulmonary vessels, which provide information about the blood flow. 3- The lungs, which may show pulmonary edema.
1- Heart size :  *  C ardio -  T horacic  R atio ( CTR ), is the maximum transverse diameter of the heart divided by the maximum thoracic diameter, in adult CTR < 50% while in children CTR < 60%.
* Comparing with previous films chest-x-ray films is often more useful. - The transverse cardiac diameter varies with the phase of respiration & with cardiac cycle, so if the   change in the cardiac size is < 1.5 cm; this is negligible because the heart size is affected by breathing & cardiac cycle.   * Overall increase in the heart size means : - Dilatation of more than one cardiac chamber. - Pericardial effusion.   1- Heart size :
2- Chamber hypertrophy & dilatation : a)  Plain X-ray films  :   *  Pressure overload  (as in : Hypertension, Aortic Stenosis, Pulmonary Stenosis), this will lead to ventricular wall hypertrophy, & such change will produce little change in the external contour of   the heart, until the ventricle fails.
*  Volume overload  (as in : Mitral Incompetence, Aortic Incompetence, Pulmonary Incompetence, Lt.   to Rt. Shunt, & Damage of the heart muscle), this will lead to dilatation of the relevant ventricle, &   this will cause an overall increase in the size of the heart (increase in the transverse cardiac diameter).   * Because enlargement of one ventricle affects the shape of the other, so it is only occasionally possible to get the classical feature Lt. or Rt. Ventricular enlargement.   a)  Plain X-ray films  :
-  Lt. Ventricular enlargement , the cardiac apex is displaced downward & laterally. Lt. Ventricular enlargement in a patient with Aortic Incompetence a)  Plain X-ray films  :
-  Rt. Ventricular enlargement , the cardiac apex is displaced upward (to the Lt. of diaphragm).   Rt. Ventricular enlargement in a patient with Primary Pulmonary Hypertension a)  Plain X-ray films  :
Lt. Atrial Enlargement :   * When it produces  Double Contour , the Rt. border of the enlarged Lt. atrium is seen adjacent to the Rt. Cardiac border within the main cardiac shadow.   Lt. Atrial Appendage  :   Bulge below the  m ain  p ulmonary  a rtery ( MPA ) on PA-view.   Lt. Atrial Enlargement in a patient with Mitral Valve Disease showing the  “ Double Contour Sign ”
Rt. Atrial Enlargement   * Will produce an increase of the Rt. cardiac border, & often accompanied by enlargement of  S uperior  V ena  C ava (SVC).   b)  Echocardiography .   --------------------------------------------------------------------
Valve movement deformity & calcification Plain X-ray films  :   * Calcification is the only could be obtained directly related to the morphology of the valve.   * Calcification is better seen by  fluoroscopy .   * It occurs in mitral valve &/or aortic valve in rheumatic heart diseases; & if it occurs in aortic valve   alone (especially in adults) it is mainly congenital aortic stenosis.
* It is the easiest & the best to see calcification by the lateral view  by drawing a line from the junction   of the diaphragm & the sternum to the Lt. main bronchus, so : - If the calcification is  below & behind , means  mitral valve . - If the calcification is  above & in front , means  aortic valve .   * If the line dissects the calcification, both valves (mitral & aortic) are calcified.   * Calcification of the mitral valve ring + elderly patient is occasionally seen in  mitral regurgitation .   Plain X-ray films :
Valve calcifications Mitral Valve Calcifications
Valve calcifications Aortic Valve Calcifications
Ventricular Contractility   * General uniform decrease contractility in valvular disorder, congenital cardiomyopathy, &   multi-vessel coronary artery diseases. * If there is focal decrease in contractility +/- dilatation in IHD. * Increase contractility of the Lt. ventricle will cause hypertrophy as in aortic stenosis, HTN, &   h ypertrophic o bstructive  c ardio m yopathy ( HOCM ).
Pericardial Diseases * 20  –  50 ml of pericardial fluid is diagnosed by echo. * Needle aspiration is needed to insure the nature of the fluid. * CT scan & MRI can show the pericardial effusion; but more important is to measure the thickness of   the pericardium where thickness of the pericardium where echo. is poor. * Unusual to diagnose pericardial effusion by plain-X-ray because the patient may have pericardial   effusion to cause a life-threatening tamponade; but only mild heart enlargement with otherwise normal contour.
* Marked increase or decrease in the transverse diameter of the cardiac shadow within one or two   weeks + No pulmonary edema is virtually diagnostic of  pericardial effusion . * Marked increase in the cardiac size + no specific chamber + normal pulmonary vasculature ( flask shape ) (& the outline of the heart become very sharp) is diagnostic of  pericardial effusion . * Pericardial calcification is seen in  50%  of patient within constrictive pericarditis , which is usually due to  TB  or Coxsackie's virus  infection. * Best seen on  lateral CXR , along the anterior & inferior surface,  & it may possible on frontal   CXR. * Usually the calcification is an important sign for constrictive pericarditis.
Pericardial Effusion Pericardial Effusion due to Viral Pericarditis
Pericardial Effusion Congestive Cardiomyopathy, this appearance usually confused with Pericardial Effusion
Pericardial Effusion Large Pericardial Effusion on an apical 4-chamber view echocardiogram
CT-scan shows fluid density (arrows) in the Pericardium  Pericardial Effusion
Pericardial Calcifications Pericardial Calcification in a patient with Severe Constrictive Pericarditis
Pericardial Calcifications Pericardial Calcification in a patient with Severe Constrictive Pericarditis
Pulmonary Vessels * It is not possible to measure the diameter of the MPA from the plain film (usually subjective); but if   there are variable degrees of bulging, means enlarged MPA. * Assessment of the hilar pulmonary arteries is more objective & the diameter of the Rt. lower lobe   artery at its mid-point (normally 9  –  16 mm). * The size of pulmonary vessels with the lung reflects the pulmonary blood flow. * Increase pulmonary blood flow is seen in ASD, VSD, & PDA, & all of these will lead to  Systemic  to  Pulmonary  (Lt. to Rt. shunt) & these will to increase pulmonary blood flow.
Pulmonary Vessels * Hemodynamically significant Lt. to Rt. shunt is (2/1 ratio or more) & this will produce CXR findings; if less ratio there will be no CXR findings & all the pulmonary vessels will (from the MPA to the   periphery of the lung) will be enlarged, & this is called &quot; Pulmonary Plethora &quot;. * There is good correlation between the size of the vessel on CXR & degree of the shunt. * Decrease pulmonary blood flow, all the vessels are small &quot; Pulmonary Oligemia &quot;. * The commonest cause of decrease pulmonary blood flow is TOF & pulmonary stenosis.
* Obstruction of the Rt. ventricle outflow + VSD will lead to Rt. to Lt. shunt. * Pulmonary stenosis will cause oligemia only is severe cases & babies or very young children.   Pulmonary Vessels

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Radiology 5th year, 13th lecture (Dr. Abeer)

  • 2. Heart Diseases * Evidence of heart diseases is given by : 1- Size & shape of the heart. 2- Pulmonary vessels, which provide information about the blood flow. 3- The lungs, which may show pulmonary edema.
  • 3. 1- Heart size : * C ardio - T horacic R atio ( CTR ), is the maximum transverse diameter of the heart divided by the maximum thoracic diameter, in adult CTR < 50% while in children CTR < 60%.
  • 4. * Comparing with previous films chest-x-ray films is often more useful. - The transverse cardiac diameter varies with the phase of respiration & with cardiac cycle, so if the change in the cardiac size is < 1.5 cm; this is negligible because the heart size is affected by breathing & cardiac cycle. * Overall increase in the heart size means : - Dilatation of more than one cardiac chamber. - Pericardial effusion. 1- Heart size :
  • 5. 2- Chamber hypertrophy & dilatation : a) Plain X-ray films : * Pressure overload (as in : Hypertension, Aortic Stenosis, Pulmonary Stenosis), this will lead to ventricular wall hypertrophy, & such change will produce little change in the external contour of the heart, until the ventricle fails.
  • 6. * Volume overload (as in : Mitral Incompetence, Aortic Incompetence, Pulmonary Incompetence, Lt. to Rt. Shunt, & Damage of the heart muscle), this will lead to dilatation of the relevant ventricle, & this will cause an overall increase in the size of the heart (increase in the transverse cardiac diameter). * Because enlargement of one ventricle affects the shape of the other, so it is only occasionally possible to get the classical feature Lt. or Rt. Ventricular enlargement. a) Plain X-ray films :
  • 7. - Lt. Ventricular enlargement , the cardiac apex is displaced downward & laterally. Lt. Ventricular enlargement in a patient with Aortic Incompetence a) Plain X-ray films :
  • 8. - Rt. Ventricular enlargement , the cardiac apex is displaced upward (to the Lt. of diaphragm). Rt. Ventricular enlargement in a patient with Primary Pulmonary Hypertension a) Plain X-ray films :
  • 9. Lt. Atrial Enlargement : * When it produces Double Contour , the Rt. border of the enlarged Lt. atrium is seen adjacent to the Rt. Cardiac border within the main cardiac shadow. Lt. Atrial Appendage : Bulge below the m ain p ulmonary a rtery ( MPA ) on PA-view. Lt. Atrial Enlargement in a patient with Mitral Valve Disease showing the “ Double Contour Sign ”
  • 10. Rt. Atrial Enlargement * Will produce an increase of the Rt. cardiac border, & often accompanied by enlargement of S uperior V ena C ava (SVC). b) Echocardiography . --------------------------------------------------------------------
  • 11. Valve movement deformity & calcification Plain X-ray films : * Calcification is the only could be obtained directly related to the morphology of the valve. * Calcification is better seen by fluoroscopy . * It occurs in mitral valve &/or aortic valve in rheumatic heart diseases; & if it occurs in aortic valve alone (especially in adults) it is mainly congenital aortic stenosis.
  • 12. * It is the easiest & the best to see calcification by the lateral view by drawing a line from the junction of the diaphragm & the sternum to the Lt. main bronchus, so : - If the calcification is below & behind , means mitral valve . - If the calcification is above & in front , means aortic valve . * If the line dissects the calcification, both valves (mitral & aortic) are calcified. * Calcification of the mitral valve ring + elderly patient is occasionally seen in mitral regurgitation . Plain X-ray films :
  • 13. Valve calcifications Mitral Valve Calcifications
  • 14. Valve calcifications Aortic Valve Calcifications
  • 15. Ventricular Contractility * General uniform decrease contractility in valvular disorder, congenital cardiomyopathy, & multi-vessel coronary artery diseases. * If there is focal decrease in contractility +/- dilatation in IHD. * Increase contractility of the Lt. ventricle will cause hypertrophy as in aortic stenosis, HTN, & h ypertrophic o bstructive c ardio m yopathy ( HOCM ).
  • 16. Pericardial Diseases * 20 – 50 ml of pericardial fluid is diagnosed by echo. * Needle aspiration is needed to insure the nature of the fluid. * CT scan & MRI can show the pericardial effusion; but more important is to measure the thickness of the pericardium where thickness of the pericardium where echo. is poor. * Unusual to diagnose pericardial effusion by plain-X-ray because the patient may have pericardial effusion to cause a life-threatening tamponade; but only mild heart enlargement with otherwise normal contour.
  • 17. * Marked increase or decrease in the transverse diameter of the cardiac shadow within one or two weeks + No pulmonary edema is virtually diagnostic of pericardial effusion . * Marked increase in the cardiac size + no specific chamber + normal pulmonary vasculature ( flask shape ) (& the outline of the heart become very sharp) is diagnostic of pericardial effusion . * Pericardial calcification is seen in 50% of patient within constrictive pericarditis , which is usually due to TB or Coxsackie's virus infection. * Best seen on lateral CXR , along the anterior & inferior surface, & it may possible on frontal CXR. * Usually the calcification is an important sign for constrictive pericarditis.
  • 18. Pericardial Effusion Pericardial Effusion due to Viral Pericarditis
  • 19. Pericardial Effusion Congestive Cardiomyopathy, this appearance usually confused with Pericardial Effusion
  • 20. Pericardial Effusion Large Pericardial Effusion on an apical 4-chamber view echocardiogram
  • 21. CT-scan shows fluid density (arrows) in the Pericardium Pericardial Effusion
  • 22. Pericardial Calcifications Pericardial Calcification in a patient with Severe Constrictive Pericarditis
  • 23. Pericardial Calcifications Pericardial Calcification in a patient with Severe Constrictive Pericarditis
  • 24. Pulmonary Vessels * It is not possible to measure the diameter of the MPA from the plain film (usually subjective); but if there are variable degrees of bulging, means enlarged MPA. * Assessment of the hilar pulmonary arteries is more objective & the diameter of the Rt. lower lobe artery at its mid-point (normally 9 – 16 mm). * The size of pulmonary vessels with the lung reflects the pulmonary blood flow. * Increase pulmonary blood flow is seen in ASD, VSD, & PDA, & all of these will lead to Systemic to Pulmonary (Lt. to Rt. shunt) & these will to increase pulmonary blood flow.
  • 25. Pulmonary Vessels * Hemodynamically significant Lt. to Rt. shunt is (2/1 ratio or more) & this will produce CXR findings; if less ratio there will be no CXR findings & all the pulmonary vessels will (from the MPA to the periphery of the lung) will be enlarged, & this is called &quot; Pulmonary Plethora &quot;. * There is good correlation between the size of the vessel on CXR & degree of the shunt. * Decrease pulmonary blood flow, all the vessels are small &quot; Pulmonary Oligemia &quot;. * The commonest cause of decrease pulmonary blood flow is TOF & pulmonary stenosis.
  • 26. * Obstruction of the Rt. ventricle outflow + VSD will lead to Rt. to Lt. shunt. * Pulmonary stenosis will cause oligemia only is severe cases & babies or very young children. Pulmonary Vessels