Body Perfusion during Adult Cardiopulmonary Bypass is Improved by Pulsatile flow with Intra-Aortic Balloon Pump

Purpose

To evaluate if the use of an intra-aortic balloon pump (IABP) during cardioplegic arrest improves body perfusion.

Methods

158 coronary artery bypass graft (CABG) patients were randomized to linear cardiopulmonary bypass (CPB) (n=71, Group A) or automatic 80 bpm intra-aortic ballon pump (IABP) induced pulsatile CPB (n=87, Group B). We evaluated hemodynamic response by Swan-Ganz catheter, inflammation by cytokines, coagulation and fibrinolysis, transaminase, bilirubin, amylase, lactate and renal function (estimated glomerular filtration rate (eGFR), creatinine, and incidence of renal insufficiency and failure).

Results

IABP induced Surplus Hemodynamic Energy was 15.8±4.9 mmHg, with higher mean arterial pressure during cross-clamping (p=0.001), and lower indexed systemic vascular resistances during cross-clamping (p=0.001) and CPB discontinuation (p=0.034). IL-2 and IL-6 were lower, while IL-10 proved higher in Group B (p<0.05). Group B showed lower chest drainage (p<0.05), transfusions (p<0.05), INR (p<0.05), and AT-III (p=0.001), together with higher platelets, aPTT (p<0.05), fibrinogen (p<0.05) and D-dimer (p<0.05). Transaminases, bilirubin, amylase, lactate were lower in Group B (p<0.05); eGFR was better in Group B from ITU-arrival to 48 hours, both in preoperative kidney disease Stages 1–2 (p<0.03) and Stage 3 (p<0.05), resulting in lower creatinine from ITU-arrival to 48 hours (p<0.03). Incidence of renal insufficiency (p=0.004) and need for renal replacement therapy (p=0.044) was lower in Group B Stage 3. Group B PaO2/FiO2 and lung compliance improved from aortic declamping to the first day (p<0.003) with shorter intubation time (p=0.01).

Conclusion

Pulsatile flow by IABP improves whole-body perfusion during CPB.

Designing a new scoring system (QualyP Score) correlating the management of cardiopulmonary bypass to postoperative outcomes

Aim:

The aim of this study was to ascertain if a score, directly derived from CPB records, could correlate to major postoperative outcomes.

Methods:

An additive score (QualyP Score) was created from 10 parameters: peak lactate value during CPB, peak VCO2i, lowest DO2i/VCO2i, peak respiratory quotient, CPB time, cross-clamp time, lowest CPB temperature, circulatory arrest, ultrafiltration during CPB, number of packed red cells transfused intraoperatively. The PerfSCORE was calculated, as well. Multivariable logistic regression models were built to detect the independent predictors of: peak lactate >3 mmol/L during the first three postoperative days; the incidence of acute kidney injury network (AKIN) 1-2-3; respiratory insufficiency; mortality.

Results:

The mean score was 4.8±2.6 (0-10). A QualyP Score ≥1 was predictive of postoperative acidosis (OR=1.595). A score ≥2 was predictive of AKIN 2 (OR=1.268) and respiratory insufficiency (OR=1.526). A score ≥5 was predictive of AKIN 3 (OR=1.848) and mortality (OR=1.497).

Conclusions:

QualyP Score may help to provide a quality marker of perfusion, emphasizing the need for goal-directed perfusion strategies.

Atrial fibrillation ablation induces reverse remodelling and impacts cardiac function

AIM

Atrio-ventricular anatomo-functional response to successful surgical atrial fibrillation (AF) ablation has been poorly investigated. Determinants of AF recurrence following surgical ablation are still debated.

METHODS

Sixty-nine patients underwent AF ablation during major cardiac surgery. Main outcomes were clinical and echocardiographic results after monopolar and/or bipolar ablation were recorded. Secondary outcomes were freedom from AF, rehospitalization and congestive heart failure (CHF) at follow-up. Predictors of AF-recurrence were evaluated.

RESULTS

Fifty-three patients (76.8%) were in sinus rhythm (SR) at 31.4±10.6 months of mean follow-up. Overall freedom from AF-recurrence was 61.4±6.6%, from hospital readmission 89.9±3.6%, from CHF 91.9±5.05%. Compared to AF-patients, SR-patients demonstrated better freedom from re-hospitalization (98.1±1.9% vs. 62.5±12.1%; P=0.0001) and CHF (94.7±5.1% vs. 77.8±13.9%; P=0.006). At follow-up SR-patients demonstrated atrial (preoperative 5.9±1.2 cm vs. follow-up 5.2±1.0; P=0.01) and ventricular reverse remodelling (preoperative LVDd 5.8±1.6cm vs. follow-up 5.0±1.3 cm; P=0.002 - preoperative LVDs 4.2±1.8 cm vs. follow-up 3.8±1.2 cm; P=0.045). E/A ratio was normal in 90.6% of SR-patients (69.6% of the total population of the study). TDI at the level of the left lateral annulus showed an improved left ventricular systole (Sm), and diastole (Em, E/Em) for SR-patients compared to AF-patients (Sm 9.30±1.66 vs. 7.81±1.41, P=0.001; Em: 10.55±1.87 vs. 7.44±0.40, P=0.001; E/Em: 0.06±0.02 vs. 0.11±0.05, P=0.0001). Preoperative atrial diameter (OR=23.9; P=0.002) and tricuspid insufficiency at follow-up (OR=3.5; P=0.008) were independent predictors of AF-recurrence. Neither etiology, nor duration of AF, nor even ablation technique influenced SR recovery (P=NS for all measurement).

CONCLUSION

Radiofrequency AF ablation achieves 76.8% of SR recovery at follow-up. Maintenance of SR improves clinical, haemodynamic and echocardiographic results.

Inflammatory response after cardiopulmonary bypass: a randomized comparison between conventional hemofiltration and steroids

AIM

Recent reports have shown anti-inflammatory effects with conventional hemofiltration (CUF) in patients undergoing cardiopulmonary bypass (CPB). The aim of this study was to evaluate the immunological and the hemodynamic response to CUF or metilprednisolone in patients undergoing coronary artery bypass grafting.

METHODS

Twenty-four consecutive patients were prospectively randomized to receive CUF (12 patients, Group A) or metilprednisolone (12 patients, Group B). Hemodynamic response was evaluated by Swan-Ganz catheter, immunological response was analyzed by IL-2, IL-4, IL-6, TNF-alpha, IFN-gamma, IL-10 before anesthetic induction (T0), at aortic-declamping (T1), at the end of surgery (T2), ITU admission (T3) and 24 hours (T4). Troponin I was measured at the same time-points. Hematological and coagulative controls were performed.

RESULTS

Morbidity and mortality were comparable between the two groups. Group A demonstrated lower cardiac index at T1 (2.1 +/- 0.69 L/min m2 vs. 3.917 +/- 1.28, P = 0.034) without significantly higher indexed-systemic-vascular-resistances at the end of surgery (1 101 +/- 434.3 dyne s cm(-5) m(-2) vs. 797.7 +/- 316.67, P = 0.233). When proinflammatory and anti-inflammatory cytokines were considered, all improved during the postoperative time course, without differences between the 2 Groups (P = NS). Hematological and coagulative data were similar in the two groups, in terms of white blood cells, platelets, prothrombin time, and activated partial thromboplastin time (P = NS).

CONCLUSIONS

Anti-inflammatory action of CUF was comparable to steroids, thus determining a similar proinflammatory response to CPB. However, hemodynamics was slightly impaired by CUF. Therefore, there is no reason to prefer CUF to steroids in patients undergoing elective CABG.