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JVP Examination Explained - Clinical Skills Deep Dive - Medical School Revision - Dr Gill
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JVP Examination Explained - Clinical Skills Deep Dive - Medical School Revision - Dr Gill

What is Jugular Venous Pressure (JVP)?

Introduction to JVP

  • Dr. James Gill introduces the topic of jugular venous pressure (JVP), explaining its significance in clinical skills.
  • JVP serves as an indirect measure of pressure in the right atrium and general venous system, with the internal jugular vein acting as a manometer.

Anatomy and Physiology

  • The right internal jugular vein's position over the superior vena cava allows for pressure changes in the right atrium to be reflected in the vein.
  • The phrase "going for the jugular" originates from this anatomical relationship, highlighting its critical role in blood flow from the head.

Clinical Relevance

  • In healthy individuals, JVP is often not visible; however, a raised JVP indicates potential underlying issues affecting right atrial or venous pressure.
  • Identifying causes of raised JVP can lead to diagnosing patient conditions effectively.

How to Examine for JVP?

Examination Technique

  • Proper examination involves looking for visible pulsation in the right internal jugular vein, typically expected at 3 to 5 cm above the sternal angle.
  • Patients should lie back at a 45-degree angle and turn their head left to relax sternocleidomastoid muscles for better visibility.

Confirming JVP vs. Carotid Pulse

  • To differentiate between carotid pulse and JVP:
  • Look for two subtle pulsations per heartbeat on JVP versus one on carotid pulse.
  • Check by feeling; JVP is impalpable while carotid pulse is palpable.

Special Tests Related to JVP

Hepatojugular Reflux Test

  • The hepatojugular reflux test helps confirm findings; it’s important to note that it's often mislabeled as a reflex rather than a reflux.
  • During this test, apply pressure on the abdomen (right upper quadrant); if there’s an increase in neck pulsation, it confirms elevated venous pressure.

Assessing Raised JVP

  • After confirming presence of JVP, assess whether it is raised by checking against normal values using landmarks like the maneuverable sternal angle (angle of Louis).

Understanding Jugular Venous Pressure (JVP)

Measuring JVP and Its Significance

  • The rib cage's movement is facilitated by multiple joints, allowing for accurate measurement of the jugular venous pressure (JVP) using a ruler placed on the patient's chest.
  • Normal JVP height should be below 3 centimeters; however, it may not always be visible due to its position behind the clavicle.
  • The hepatojugular reflux test can help visualize the JVP when it's obscured, indicating potential health issues in severely unwell patients.

Causes of Raised JVP

  • Common causes of elevated JVP include right heart failure, right ventricular hypertrophy, constrictive pericarditis, cardiac tamponade, and tricuspid stenosis or regurgitation.
  • Each condition leads to increased pressures within the heart that contribute to a higher JVP reading.

Respiratory and Other Contributing Factors

  • Respiratory issues such as pulmonary embolism or pulmonary hypertension increase resistance in the lungs, causing elevated JVP due to greater force exerted by the heart.
  • Fluid overload from various sources (iatrogenic injury or renal failure) can also lead to raised JVP levels.

Mnemonic for Remembering Causes of Elevated JVP

  • A mnemonic "PQRST" helps recall key causes:
  • P: Pericardial effusion, pulmonary embolism, chronic pulmonary hypertension.
  • Q: Quantity of fluid overload.
  • R: Right heart failure.
  • S: Superior vena cava obstruction.
  • T: Tricuspid regurgitation or stenosis.

Understanding the JVP Waveform

  • The internal jugular vein has a complex waveform with at least two peaks; understanding this complexity provides insights into cardiovascular health beyond simple mnemonics.
  • There are five sections in the JVP waveform that reflect different phases of atrial and ventricular activity.

Breakdown of the Five Sections of the JVP Waveform

  • The first section is labeled as 'A wave,' which corresponds to right atrium contraction pushing blood through an open tricuspid valve.
  • Following this is 'X descent,' where atrial relaxation occurs as blood flows into the ventricle; this slope decreases due to reduced atrial pressure.

Additional Waveform Details

  • A brief 'C wave' may occur during initial contraction of the right ventricle but is typically undetectable without internal monitoring.

Understanding the Jugular Venous Pressure (JVP) Waveform

Overview of JVP Dynamics

  • The discussion begins with the relationship between atrial activity and the x descent in JVP, contrasting it with conditions like pericarditis or cardiac tamponade that increase pressure on the heart wall. This leads to an increased JVP.

Components of the JVP Waveform

  • Following the x descent, a new upward wave known as the v wave occurs as blood fills the atria against a closed tricuspid valve. More blood results in greater swelling of the atria, causing a rise in pressure.
  • A dip at the end of the y wave is explained by the opening of the tricuspid valve during atrial contraction (a wave). This brief decrease in pressure allows for effective blood flow through to the ventricles.

Key Waves Explained

  • The key components of JVP are summarized:
  • A-wave: Represents atrial contraction.
  • X-wave: Indicates atrial relaxation.
  • C-wave: Corresponds to ventricular contraction.
  • V-wave: Reflects right atrial filling with blood.
  • Y-section: Marks opening of the tricuspid valve.

Clinical Implications and Pathologies

  • Various pathologies can affect JVP readings:
  • An increase in A-wave may indicate right ventricular hypertrophy or tricuspid stenosis due to reduced space within pericardium.
  • Atrial fibrillation can lead to a reduction or absence of A-wave because contractions become disordered, resulting in non-uniform pressure changes.

Conclusion and Clinical Relevance

Video description

Abdominal Examination Explained - Clinical Skills Deep Dive - Medical School Revision - Dr Gill The Jugular Venous Pressure It doesn't matter how many times I had the JVP explained to me in medical school lectures, or in medical school revision sessions after class, it always was a major challenge for me to understand. However, if looked at carefully, and slowly, the JVP waveform, isn't actually impossible to understand, but does quite reasonably have a reputation as one of the more difficult clinical skill revision challenges In this video, we will try to carefully go over graphs of the venous pulsation to allow easy comprehension of the JVP waveform explained #drgill # jvp #clinicalskills You can now consult via video or in person with Dr Gill at Dr Finlay’s Private Practice - https://www.drfinlays.co.uk/services/video-consultation/ 0:00 start 00:20 – Contents 00:50 – What is the JVP 01:03 – Internal Jugular Vein Anatomy 01:40 – Going for the Jugular 01:58 – Challenges with the JVP 02:56 – How to examine the JVP 03:18 – Where to look 03:38 – How to measure the JVP 03:46 – Patient Example 04:06 – How to get the best view 04:38 – The Three Golden Giveways 04:45 – Check the pulse 05:15 – Palpate the visible pulsation 05:33 – Hepatojugular Reflux (Yes, REFLUX) 05:53 – Hepatojugular Reflux Patient Example 06:30 – The reflux manoeuvre explained 07:12 – What you should see in healthy patients 07:28 – How to tell if it's abnormal 07:53 – The manubriosternal angle (angle of Louis) 08:18 – Using the ruler 08:54 – The ruler explained in the diagram 09:03 – Normal and Absent JVP 09:31 – Why you should check the JVP is below the clavicle (Severe Tricuspid Regurgitation) 09:59 – Causes of a raised JVP 10:07 – Cardiac Causes 11:12 – Pulmonary Causes 11:33 – Fluid Overload 11:54 – Mnemonic for raised JVP causes 13:11 – The JVP wave form 13:40 – 5 (ish) Sections of the JVP Wave form 14:34 - A 15:20 - X 15:47 – C 16:27 – X Again 17:25 - V 17:50 – Y 18:37 – Re-cap of the JVP wave 19:09 – Additional Pathologies seen in the Wave Form 19:52 – Summary 20:06 – Remember your history! 20:24 – Remember to like and Subscribe!