The nurse observes a ______ pattern in the neck veins, showing rapid x and y descents, typical of constrictive pericarditis.

A W pattern in jugular venous pulsations, characterized by prominent and rapid x and y descents, is a classical sign of constrictive pericarditis. This pattern reflects the rapid early diastolic filling followed by sudden cessation due to the rigid pericardium.

Jugular Venous Waveform Patterns:

1. W pattern
- Characteristic of constrictive pericarditis
- Shows rapid x and y descents
- Indicates restricted ventricular filling

2. Normal JVP components:
- a wave: atrial contraction
- c wave: tricuspid bulging
- x descent: atrial relaxation
- v wave: venous filling
- y descent: ventricular filling

3. Clinical significance:
- Elevated JVP: right heart failure
- Kussmaul's sign: paradoxical rise with inspiration
- Cannon a waves: AV dissociation
- Prominent v waves: tricuspid regurgitation

4. Constrictive pericarditis features:
- Thickened pericardium
- Impaired diastolic filling
- Equalization of diastolic pressures
- Pericardial knock
- Ventricular interdependence