Understanding Kussmaul's Sign
Kussmaul's sign is characterized by an abnormal increase in the jugular venous pressure (JVP) during inspiration.
This sign typically indicates impaired diastolic filling of the right ventricle (RV). The normal decrease in intrathoracic pressure during inspiration aids RV filling; when this leads to a rise in JVP, it suggests a problem with RV compliance or filling.
Analyzing Conditions for Kussmaul's Sign
Kussmaul's sign is usually present in conditions that impede RV diastolic filling. Let's examine the options:
- Massive Pulmonary Embolism: Causes acute RV strain and obstruction, significantly impairing its ability to fill. Kussmaul's sign is expected.
- Restrictive Cardiomyopathy: The stiff, non-compliant ventricle restricts diastolic filling, leading to elevated venous pressures and often Kussmaul's sign.
- Right Ventricular Infarction: Directly impairs RV contractility and relaxation, hindering diastolic filling and causing increased JVP. Kussmaul's sign is common.
- Hypertrophic Cardiomyopathy: Primarily characterized by left ventricular hypertrophy and diastolic dysfunction. While RV can be involved, Kussmaul's sign is not a typical feature unless there is significant RV dysfunction or associated constrictive pericarditis. The primary pathology usually affects LV filling or outflow, not necessarily RV diastolic filling in a way that causes Kussmaul's sign.
Identifying the Exception
Hypertrophic Cardiomyopathy (Option C) is the condition listed that does not typically present with Kussmaul's sign because the primary pathophysiology does not usually involve impaired right ventricular diastolic filling leading to increased jugular venous pressure on inspiration.
Important Questions from Heart Failure
High output cardiac failure is caused by which of the following diseases ?
1. Beri-beri
2. Severe anaemia
3. Thyrotoxicosis
Select the correct answer using the code given below:
- Which of the following electro-cardio-graphic findings are manifestations of digitalis intoxication?
1. Ventricular bigeminy
2. Ventricular tachycardia
3. Atrial flutter
4. Atrial tachycardia with variable block
Select the correct answer using the code given below: - A 35-year-old labourer worker consulted a local medical practitioner for recurrent attack of chest pain. His elder brother had similar complaint and died at the age of 40 years. The labourer worker was advised to take sublingual nitroglycerin at the time of chest pain. But after taking nitroglycerin, the chest pain increased in intensity. Which one of the following is most likely ?
- The treatment of choice for a 32 year old male patient of severe mitral stenosis (Rheumatic) with thickened and calcified valves on echocardiography is:
- A 55-year old man, non smoker presents with sudden onset of shortness of breath. On examination, pulse rate is 110/minute and B.P. 180/110 mm Hg. Patient is restless and anxious. Examination of chest shows bilateral rhonchi and crepitation. $S_3$ gallop is heard on auscultation of precordium. There is no history of chronic bronchitis. The most likely diagnosis is:
