MioAtlas
Comparison

Acute mitral regurgitation from papillary muscle rupture vs Post-infarction ventricular septal defect: clinical and ECG differences

Side-by-side comparison of Acute mitral regurgitation from papillary muscle rupture and Post-infarction ventricular septal defect according to the MioAtlas 3D cardiac simulator model.

Acute mitral regurgitation from papillary muscle rupture
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Post-infarction ventricular septal defect
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Findings by layer and diagnostic parameters

Layer / Finding Acute mitral regurgitation from papillary muscle rupture Post-infarction ventricular septal defect
Hemodynamics
  • Massive acute volume overload on left atrium and left ventricle with normal or only slightly enlarged chamber sizes [V1] [V3].
  • Giant regurgitant 'v' wave in left atrium approaching left ventricular systolic pressure [C9].
  • Cardiogenic shock with severely diminished forward cardiac output [C9].
  • Shunt direction: Left-to-right (LV systole → RV) [C9].
  • Systolic blood pressure: < 90 mmHg (hypotension/shock) [C9].
  • Pulmonary capillary wedge pressure: > 20 mmHg [C9].
  • Cardiac output: Markedly depressed (< 3.5 L/min) [C9].
Rhythm
  • Obligatory sinus tachycardia as an adrenergic compensatory mechanism [C9] [V1].
  • Compensatory sinus tachycardia secondary to sympathetic hyperactivation in low output state [C9].
ECG
  • Signs of transmural or evolving acute myocardial infarction: ST elevation or pathological Q waves of necrosis in inferior leads (DII, DIII, aVF) or inferolateral leads (due to compromise of right coronary artery or circumflex branch supplying the posteromedial muscle) [E1] [C9].
  • Pathological Q waves of transmural necrosis (infarct Q waves) in anterior leads (V1–V4) or inferior leads (II, III, aVF) with residual ST-segment elevation [C9] [E1].
Heart sounds and murmurs
  • Systolic murmur: Early decrescendo holosystolic or mid-systolic murmur (often soft, grade 2–3/6, or muffled due to early equilibration of LV-LA systolic pressures) auscultated at the apex [V1] [G1-14].
  • Murmur radiation: In posteromedial papillary rupture (most common), the regurgitant jet is directed toward the anterior LA wall and aortic root, radiating toward the cardiac base and carotid arteries (mimicking aortic stenosis) [V3] [C9] [G1-06] [G1-14].
  • First heart sound (S1): Decreased or muffled due to coaptation incompetence [G1-10].
  • Added sounds: Persistent third heart sound (S3) [G1-12] [C9]; frequent fourth heart sound (S4) if sinus rhythm is present [G1-13] [C9].
  • Second heart sound (S2): Loud P2 due to acute pulmonary arterial and venocapillary hypertension [G1-11] [C9].
  • Harsh holosystolic murmur: Loud, harsh pansystolic murmur (grade 3–5/6) auscultated at lower left sternal border and radiating in cartwheel pattern toward right hemithorax and apex [C9] [G810-01] [B1].
  • Tactile thrill: Palpable holosystolic thrill at left parasternal border [C9] [G810-01].
  • Third heart sound (S3): Frequent S3 gallop due to volume overload [C9].
Arterial pulse
  • Thready, rapid pulse with greatly reduced volume (pulsus parvus et celer / tachycardic) characteristic of cardiogenic shock [B4] [C9].
  • Thready and fast-rising arterial pulse (parvus) due to drop in effective forward stroke volume into aorta [B4] [C9].
Jugular venous pulse
  • Marked jugular venous distention with acute systemic venous hypertension [B3] [C9].
  • Severe jugular distension with elevated mean JVP and prominent 'v' wave [B3] [C9].
Maneuvers
  • The patient is in extreme hemodynamic instability (physical provocative stress maneuvers are contraindicated) [C9].
  • Not performable in unstable cardiogenic shock; afterload increase (handgrip) would increase LV–RV gradient, worsening shunt [B1].

Sources and bibliographic references

Acute mitral regurgitation from papillary muscle rupture

  1. [B3] The jugular venous pressure revisited . Cleve Clin J Med (2013) . DOI: 10.3949/ccjm.80a.13039 PubMed: 24085809
  2. [B4] The Carotid Pulse . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250154
  3. [C9] Mechanical Complications of Acute Myocardial Infarction: A Scientific Statement From the American Heart Association . Circulation (2021) . DOI: 10.1161/CIR.0000000000000985 PubMed: 34126755
  4. [E1] AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part V: electrocardiogram changes associated with cardiac chamber hypertrophy: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society: endorsed by the International Society for Computerized Electrocardiology . Circulation (2009) . DOI: 10.1161/CIRCULATIONAHA.108.191097 PubMed: 19228820
  5. [G1-06] The mitral apparatus. Functional anatomy of mitral regurgitation . Circulation (1972) . DOI: 10.1161/01.cir.46.2.227 PubMed: 5046018
  6. [G1-10] The First Heart Sound . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250175
  7. [G1-11] The Second Heart Sound . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250183
  8. [G1-12] The Third Heart Sound . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250184
  9. [G1-13] The Fourth Heart Sound . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250185
  10. [G1-14] Systolic Murmurs . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250186
  11. [V1] 2025 ESC/EACTS Guidelines for the management of valvular heart disease . Eur Heart J (2025) . DOI: 10.1093/eurheartj/ehaf194 PubMed: 40878295
  12. [V3] Recommendations for Noninvasive Evaluation of Native Valvular Regurgitation: A Report from the American Society of Echocardiography Developed in Collaboration with the Society for Cardiovascular Magnetic Resonance . J Am Soc Echocardiogr (2017) . DOI: 10.1016/j.echo.2017.01.007 PubMed: 28314623

Post-infarction ventricular septal defect

  1. [B1] Bedside diagnosis of systolic murmurs . N Engl J Med (1988) . DOI: 10.1056/NEJM198806163182404 PubMed: 2897627
  2. [B3] The jugular venous pressure revisited . Cleve Clin J Med (2013) . DOI: 10.3949/ccjm.80a.13039 PubMed: 24085809
  3. [B4] The Carotid Pulse . Clinical Methods: The History, Physical, and Laboratory Examinations (1990) . PubMed: 21250154
  4. [C9] Mechanical Complications of Acute Myocardial Infarction: A Scientific Statement From the American Heart Association . Circulation (2021) . DOI: 10.1161/CIR.0000000000000985 PubMed: 34126755
  5. [E1] AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part V: electrocardiogram changes associated with cardiac chamber hypertrophy: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society: endorsed by the International Society for Computerized Electrocardiology . Circulation (2009) . DOI: 10.1161/CIRCULATIONAHA.108.191097 PubMed: 19228820
  6. [G810-01] Risk factors, angiographic patterns, and outcomes in patients with ventricular septal defect complicating acute myocardial infarction. GUSTO-I (Global Utilization of Streptokinase and TPA for Occluded Coronary Arteries) Trial Investigators . Circulation (2000) . DOI: 10.1161/01.cir.101.1.27 PubMed: 10618300