How to Differentiate Mitral Regurgitation (MR) vs Aortic Stenosis (AS) on CW Doppler and CW envelope SHAPE

1. Timing

Holosystolic signal (throughout systole).

Starts with isovolumic contraction and ends after A2 sometimes.

No clear envelope edges.

Mid-systolic envelope (starts after IVCT, ends before A2).

Well-defined start and end.

---

2. Shape of CW Envelope

Mitral Regurgitation (MR)

Tall, dense, triangular (early-peaking)

“V-shaped” or triangular because MR is often pressure-dependent.

Peak velocity early then falls → early systolic peak (unless severe chronic MR → rounded).

Aortic Stenosis (AS)

Parabolic, rounded, symmetric envelope

“Bullet shape”

Peaks mid-systole (late peak if severe).

---

3. Velocity

MR usually has higher velocity (5–6 m/s common).

AS varies depending on severity but usually 3–5 m/s.

---

4. Direction & Position of CW Line

MR CW is obtained from the apex directed posteriorly into the LA.

AS CW is obtained in multiple windows (RUP parasternal, apical, suprasternal).

---

Summary

Holosystolic

Triangular / V-shaped

Early peak

Very high velocity

Fills entire systole

Mid-systolic

Rounded / parabolic

Mid or late peak

Duration shorter

Does not start at MVC and ends before A2

Comments

Brugada ECG vs Incomplete Right Bundle Branch Block (iRBBB)

Brugada ECG vs Incomplete Right Bundle Branch Block (iRBBB) Why this differentiation matters Brugada pattern is a malignant channelopathy associated with sudden cardiac death, while incomplete RBBB is usually a benign conduction variant. Mislabeling Brugada as iRBBB can be fatal; overcalling iRBBB as Brugada can lead to unnecessary anxiety and ICD implantation. --- 1. Basic Definitions Brugada ECG Pattern Primary repolarization abnormality Genetic sodium-channel disorder Characteristic ST-segment elevation in V1–V3 Risk of ventricular fibrillation and sudden death Incomplete RBBB (iRBBB) Depolarization abnormality Delay in right ventricular conduction Common in healthy individuals Usually asymptomatic and benign --- 2. ECG Morphology: Side-by-Side Comparison QRS Duration Brugada: QRS usually <120 ms iRBBB: QRS <120 ms, but with RBBB morphology --- V1–V2 Pattern (Key Differentiator) Brugada Pseudo-RBBB appearance ST elevation ≥2 mm ST segment is coved or saddleback Terminal QRS bl...

𝘼𝙣𝙩𝙞𝙘𝙤𝙖𝙜𝙪𝙡𝙖𝙩𝙞𝙤𝙣 𝘼𝙛𝙩𝙚𝙧 𝙎𝙩𝙧𝙤𝙠𝙚

𝘼𝙣𝙩𝙞𝙘𝙤𝙖𝙜𝙪𝙡𝙖𝙩𝙞𝙤𝙣 𝘼𝙛𝙩𝙚𝙧 𝙎𝙩𝙧𝙤𝙠𝙚 in Patient with AF and acute IS/TIA European Heart Association Guideline recommends: • 1 days after TIA • 3 days after mild stroke • 6 days after moderate stroke • 12 days after severe stroke Early anticoagulation can decrease a risk of recurrent stroke and embolic events but may increase a risk of secondary hemorrhagic transformation of brain infarcts. The 1-3-6-12-day rule is a known consensus with graded increase in delay of anticoagulation between 1 and 12 days after onset of ischemic stroke or transient ischemic attack(TIA), according to neurological severity based on European expert opinions. However, this rule might be somewhat later than currently used in a real-world practical setting.

Acute Treatment of Hyperkalemia

Acute Treatment of Hyperkalemia – A Practical, Bedside-Oriented Guide Hyperkalemia is a potentially life-threatening electrolyte abnormality that demands prompt recognition and decisive management. The danger lies not only in the absolute potassium value but in its effects on cardiac conduction, which can rapidly progress to fatal arrhythmias. Acute treatment focuses on three parallel goals: stabilizing the cardiac membrane, shifting potassium into cells, and removing excess potassium from the body. Understanding this stepwise approach helps clinicians act quickly and rationally in emergency settings. Why Hyperkalemia Is Dangerous Potassium plays a key role in maintaining the resting membrane potential of cardiac myocytes. Elevated serum potassium reduces the transmembrane gradient, leading to slowed conduction, ECG changes, ventricular arrhythmias, and asystole. Importantly, ECG changes do not always correlate with potassium levels, so treatment decisions should be based on clinical c...

Dr. Usman's Cardiology Notes

Search This Blog