Cardiology. the Sounds: #7 HCM. LV Outflow Obstruction: Aortic Stenosis. (Coming Soon - HCM)

Transcription

1 A Cardiology HCM LV Outflow Obstruction: Aortic Stenosis (Coming Soon - HCM) the Sounds: #7 Howard J. Sachs, MD Howard@12daysinmarch.com

2 Aortic Valve Disorders Stenosis Regurgitation

3 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM Very noisy when ventricle contracts

4 LV Outflow Obstruction AS RUSB Base of Heart Ao LSB Chronic AI HCM VSD

5 AS RUSB Base of Heart Ao LSB Apex

6 Ao LSB

7 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Rapid Ejection Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM

8 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Rapid Ejection Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM

9 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Failure to radiate to the carotids Key points: AND Associated with congenital bicusp (TS) Normal intensity of S2 Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM Non-Critical AS

10 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Obstructive Black Box physiology Warning: LVH Afterload (prototypical) The NBME assumes you can Do identify Not Confuse: the murmur. HCM It is a rare question that asks you to name the murmur. They present the abnormal physical exam and then launch derivatives.

11 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM Concentric Hypertrophy

12 Aortic Valve Disorders Stenosis Location: RUSB (base) carotids Systolic Quality: crescendo-decrescendo Key points: Associated with congenital bicusp (TS) Obstructive physiology LVH Afterload (prototypical) Do Not Confuse: HCM

13 ~ Aortic Stenosis Hemodynamics I ~ Pressure Ao Close ESV Increased Afterload Isovolumetric Relaxation Isovolumetric Contraction Stroke Volume MV Open Rapid Filling MV Close Low Hg, Hi Vol EDV SV = EDV - ESV Volume

14 Pressure Pressure Volume Volume

15 ~ Aortic Stenosis Hemodynamics I ~ Pressure Ao Close ESV Increased Afterload Increased LV pressure to overcome valve R (not Ao mm Hg) Isovolumetric Relaxation Stroke Volume MV Open Rapid Filling MV Close SV = EDV - ESV Volume

16 ~ Aortic Stenosis Hemodynamics I ~ Ao Close ESV Increased Afterload Pressure Isovolumetric Relaxation Stroke Volume SV 2 to: Decreased velocity of sarcomere shortening Decreased distance shortened MV Open Rapid Filling MV Close SV = EDV - ESV Volume

17 ~ Aortic Stenosis Hemodynamics I ~ Ao Close ESV Increased Afterload Pressure Stroke Volume Cardiac work = SV x afterload Cardiac work = SV x mm Hg BP major determinant of cardiac work MV Open Rapid Filling MV Close Volume

18 ~ Aortic Stenosis Hemodynamics I ~ Ao Close ESV Increased Afterload Pressure Stroke Volume In spite of SV, the cardiac work and myocardial oxygen demand increases Cardiac work = SV x afterload Cardiac work = SV x mm Hg BP major determinant of cardiac work MV Open Rapid Filling MV Close Volume

19 Increased Afterload (AS) Decreased velocity of shortening Decreased distance shortened Decreased SV Increased cardiac work Increased myocardial oxygen consumption Aortic Stenosis Malignant HTN

20 Compare and Contrast Increased Afterload (AS) Decreased velocity of shortening Decreased distance shortened Decreased SV Increased cardiac work Increased myocardial oxygen consumption Decreased Afterload (Nitroprusside) Treatment of Choice for Malignant HTN (on Step One)

21 Compare and Contrast Decreased Afterload (Nitroprusside) Increased Afterload (AS) Decreased velocity of shortening Decreased distance shortened Decreased SV Increased cardiac work Increased myocardial oxygen consumption

22 Compare and Contrast Increased Afterload (AS) Decreased velocity of shortening Decreased distance shortened Decreased SV Increased cardiac work Increased myocardial oxygen consumption Decreased Afterload (Nitroprusside)

23 Aortic Stenosis Hemodynamics II 120 AV Open AV Close 80 Isovol Cont Rapid eject Isovol Relax LV Pressure Rapid filling 10 MV Close MV Open What happens to the LV mm Hg curve with aortic stenosis? LV pressure has to surpass resistance of the stenotic valve.

24 Aortic Stenosis Hemodynamics II AV Open 120 AV Close 80 Isovol Cont Isovol Relax 10 MV Close MV Open Rapid filling What happens to the LV mm Hg curve with aortic stenosis? LV pressure has to surpass resistance of the stenotic valve.

25 Aortic Stenosis Hemodynamics II Rapid ejection Crescendo Decrescendo 120 AV Close 80 Isovol Cont Isovol Relax 10 MV Close MV Open Rapid filling

26 Aortic Stenosis Hemodynamics II Rapid ejection Crescendo Decrescendo 120 AV Close 80 Isovol Cont Isovol Relax 10 MV Close MV Open Rapid filling What happens to the LV mm Hg curve with aortic stenosis? LV pressure has to increase (surpassing Ao Hg) to open stenotic valve. Peak murmur intensity?

27 Symptoms SCD Angina Syncope CHF Symptoms Angina Where are the coronary ostia located?

28 Symptoms SCD Angina Syncope CHF Symptoms Angina Where are the coronary ostia located?: Above aortic valve

29 Symptoms Angina Where are the coronary ostia?: Above aortic valve Symptoms SCD Angina Syncope CHF Symptoms Syncope* Obstructive basis. If they describe a patient with systolic murmur and syncope* how will you * distinguish may be described between by AS LH and or dizziness HCM?

30 Symptoms Angina Where are the coronary ostia?: Above aortic valve Symptoms SCD Angina Syncope CHF Symptoms Syncope Obstructive basis. If they describe a patient with systolic murmur and syncope how will you distinguish between AS and HCM?

31 Symptoms SCD Angina Syncope CHF Symptoms Syncope Obstructive basis. If they describe a patient with systolic murmur and syncope, how will you distinguish between AS and HCM? HCM: FH SCD, young age/athlete, dysrhythmia, maneuvers (PE and cath lab), pathology AS: older (unless bicusp), maneuvers not reliable, quality/location of murmur What They Tell You, What They Don t Tell You

32 Symptoms SCD Angina Syncope CHF CHF Increased afterload Eventual Cardiac Decompensation

33 CHF Increased afterload Eventual Cardiac Decompensation Atrial Fibrillation and Aortic Stenosis Symptoms SCD Angina Syncope CHF Complications: CHF Ischemia Preload Pulmonary Venous Congestion Fast heart rate less time in diastole Diastolic Filling of Coronary Vessels

34 Aortic Stenosis Symptoms SCD Angina Syncope CHF They use the signs and symptoms of aortic stenosis as a gateway condition to a number of loosely associated derivatives

35 Black Box Warning: The NBME assumes you can identify the murmur. They present the abnormal physical exam and then launch derivatives.

36 Aortic Stenosis: Pathology XO Raphe Dystrophic calcification Who gets AS (demographic description on Step One)? Aged degenerative; dystrophic calcification ~ Young or Turner syndrome with congenital bicusp ~ ~ Rheumatic Fever, late manifestation ~

37 Aortic Stenosis: Pathology XO Raphe Dystrophic calcification Who gets AS (demographic description on Step One)? Aged degenerative; dystrophic calcification ~ Young or Turner syndrome with congenital bicusp ~ ~ Rheumatic Fever, late manifestation ~

38 LVH: complication of pressure overload (AS, HTN) Normal myocardium Wall Stress = P x r/2h h wall thickness Thick wall, Low stress Thicker Concentric Hypertrophy (adaptive: wall stress)

39 Carotids Ao Loud and systolic: ventricular contraction RUSB Stethoscope placed here is likely AS They will ask derivatives (pathology, hemodynamics, etc)

40 Aortic Stenosis Demographic Elderly Young patient with congenital bicusp (and/or Turner s) Late complication of rheumatic fever Physical Exam RUSB/base Crescendo-Decrescendo systolic murmur Radiating to carotids Severity affects intensity of S 2 Hemodynamics Increased afterload: derivatives and the pressure-volume curve Compare and contrast with the decreased afterload curve Cardiac cycle curve: peak murmur intensity Pathology Dystrophic calcification of the elderly Fusion of the commissure in the congenital bicusp Complications/Presentation Concentric LVH SCD, Angina, Syncope, CHF

41 A Cardiology HCM LV OutFlow Obstruction: Aortic Stenosis (Coming Soon - HCM) the Sounds: #7 Howard J. Sachs, MD Howard@12daysinmarch.com