Sequential wire shifting technique might be in some cases indispensable to acquire adequate pulmonary wedge pressure during right heart catheterization

Right heart catheterization (RHC), according to current guidelines presented in the Joint Statement of the Polish Cardiac Society’s Working Group on Pulmonary Circulation and Association of Cardiovascular Interventions [1], is essential to diagnose pulmonary hypertension (PH), which is a serious limitation in case of heart transplant (HTx) listing. A pulmonary vascular resistance (PVR) value exceeding 3.0 Wood units is associated with raised post-operational mortality [2].
A 60-year old man with ischemic cardiomyopathy had RHC prior to HTx listing. Initial examination 6 months earlier failed to assess pulmonary capillary wedge pressure (PCWP). Moreover, it provoked acute decompensation with the need of urgent treatment. Several issues may have contributed as the patient presented a severe clinical condition with New York Heart Association class IV, INTERMACS class III. Secondly, heart failure (HF) emerged gradually, which resulted in major dilatation of the ventricles. Thirdly, the patient presented with combined pre- and post-capillary hypertension; hence he would fall within the scope previously described as “out-of-proportion” PH. Likewise, in this clinical state, raised PVR may lead to a progressive dilatation of the pulmonary arteries. The heavily remodelled anatomy of the pulmonary vascular bed may present a challenge that needs a real breakthrough unless the procedure remains incomplete; hence the sequential wire shifting (SWS) technique was introduced. Noticeably, the unequivocal result of PCWP merits the simultaneous assessment of left ventricular end-diastolic pressure during left heart catheterization as the gold standard, especially given that it may lead to misclassification of PH with all consequences [3].
A 7-F Balton, Poland sheath is inserted by the use of Seldinger’s technique. A Swan-Ganz (SG) catheter (Edward Lifesciences, USA) is introduced into the right ventricle in order to perform single beat calibration of the catheter and pressure transducer based on the routine, previously described manner [4]. Subsequently, the catheter and the pressure transducer are disconnected. Latterly the diagnostic EMERALD, Cordis, USA, guidewire 0.035 × 150 cm, 3 mm J tip wire is inserted into the left pulmonary artery. A multi-purpose (MPA), Cordis diagnostic catheter is introduced with the subsequent removal of the diagnostic wire. A 300 cm J-tip Whisper ES, Abbott, USA, angioplasty wire is placed via the MPA catheter with subsequent removal of the latter. The clinched angioplasty wire is used as a rail for the introduction of the SG catheter. Notably, the use of a peripheral guidewire might be dangerous due to the risk of distal perforation. The acquired value of PCWP is reliable; moreover, re-evaluation of RV pressure represents excellent concordance with the initial values, and last but not least it enables further calculations of PVR. To access the step-by-step description of SWS please refer to Figure 1 and Table I with further commentaries.
In conclusion, SWS is a safe technique to acquire PCWP in a demanding group of patients with HF coinciding with major dilatation of pulmonary arteries in the course of PH. Theoretically, it might be either initially (in the case of presumably raised RV systolic pressure in echocardiography) or provisionally (in the case of impaired intraoperational manoeuvrability) implemented in almost all cases. However, its potential contribution to clinical practice requires further evaluation.

Conflict of interest

The authors declare no conflict of interest.

References

1. Kurzyna M, Araszkiewicz A, Błaszczak P, et al. Summary of recommendations for the haemodynamic and angiographic assessment of the pulmonary circulation. Joint statement of the Polish Cardiac Society’s Working Group on Pulmonary Circulation and Association of Cardiovascular Interventions. Kardiol Pol 2015; 73: 63-8.
2. Costard-Jäckle A, Fowler MB. Influence of preoperative pulmonary artery pressure on mortality after heart transplantation: testing of potential reversibility of pulmonary hypertension with nitroprusside is useful in defining a high risk group. J Am Coll Cardiol 1992; 19: 48-54.
3. Halpern SD, Taichman DB. Misclassification of pulmonary hypertension due to reliance on pulmonary capillary wedge pressure rather than left ventricular end-diastolic pressure. Chest 2009; 136: 37-43.
4. Brimioulle S, Wauthy P, Ewalenko P, et al. Single-beat estimation of right ventricular end-systolic pressure-volume relationship. Am J Physiol Heart Circ Physiol 2003; 284: H1625-30.

Corresponding author:
Grzegorz M. Kubiak MD, PhD, Department of Cardiac Surgery and Transplantology, SMDZ in Zabrze, Medical University of Silesia in Katowice, Silesian Centre for Heart Disease, 9 Curie-Skłodowska St, 41-800 Zabrze, Poland, phone: +48 32 373 38 57, e-mail: gkubiak@sccs.pl
Received: 17.06.2019, accepted: 13.07.2019.