Cardiothoracic & vascular anesthesia
Right Ventricular Response to Hypercapnia After Mitral Valve Repair: A Hemodynamic Assessment
Authors' conclusion
In postoperative mitral valve repair surgery patients, hypercapnic acidosis caused increased PAP values measured from the PAC. The TEE study did not detect significant structural or functional changes in the RV despite the increase in PAP.
Study context
- Population
- Hemodynamically stable patients after elective mitral valve prolapse repair, mechanically ventilated in the recovery roomeach studied in both states
- Participants
- 20 patients
- Exposure
- Hypoventilation-induced hypercapnia vs normocapnia
- Outcome
- PAP and changes in RV dimensions and function (pulmonary arterial catheter (PAC) and TEE)
Methodological detailsopen, single-centre, paired (within-patient) comparison
- Open
- Single-centre
- Paired (within-patient) comparison
Main finding
As reported in the abstract
Pulmonary arterial pressure (PAP) values significantly increased in hypercapnia (p < 0.05); systolic pulmonary pressure rose from mean 30.2 mmHg (SD 8.4) in normocapnia to 44.2 mmHg (SD 9.3) in hypercapnia
30.2 mmHg (8.4) to 44.2 mmHg (9.3)
Observational data: associations, not effects.
Further findings
PaCO2 and pH (normocapnia vs hypercapnia)
- PaCO2, mean (SD), normocapnia vs hypercapnia; significant difference (p < 0.05)
- 5.0 kPa (0.3) versus 7.8 kPa (0.4)
- pH, mean (SD), normocapnia vs hypercapnia; significant difference (p < 0.05)
- 7.40 (0.03) versus 7.24 (0.03)
Pulmonary vascular resistance
- Unchanged
CO (hyperdynamic state in hypercapnic acidosis)
- CO significantly elevated in hypercapnic acidosis (p < 0.05), mean (SD), normocapnia vs hypercapnia
- 4.1 L/min [0.9] vs. 5.5 L/min [1.3]
Systemic vascular resistance
- SVR significantly decreased in hypercapnic acidosis (p < 0.05), mean (SD), normocapnia vs hypercapnia
- 1402.2 dynes/s/cm-5 [364.8] vs. 927.7 dynes/s/cm-5 [260.3]
Right ventricular (RV) structure and function (transesophageal echocardiographic (TEE))
- Increased PAP did not cause detectable structural or functional changes indicating RV dysfunction or failure
Pulmonary arterial velocity time integral
- Rose significantly (p < 0.05), mean (SD), from normocapnia to hypercapnia, associated with the hyperdynamic state
- 13.0 cm (2.7) to 15.1 cm (3.4)
Original publication
Composed by AI from the published abstract and checked against it. How Briefs are made →