Physiology Series
Every breath is a heart decision
In the preterm chest, every ventilator change is also a change to preload, afterload and pulmonary vascular resistance.
Source: Courchia B, et al. Paediatr Respir Rev. 2026.
The question
The heart and lungs share the thoracic cavity. What does that mean for the preterm infant, where a respiratory decision is also a circulatory one?
The study
A narrative review by Courchia, Altit and colleagues. It lays out the governing physiology and applies it to the preterm transition, respiratory support modes and common NICU scenarios. It is a synthesis, not a new trial.
What they found
- Every ventilatory decision simultaneously alters cardiac preload, afterload, pulmonary vascular resistance (PVR) and ventricular interaction.
- These cardiopulmonary interactions are amplified in the preterm infant: the immature myocardium tolerates afterload poorly, PVR stays labile after birth, and ductal and atrial shunts respond to intrathoracic pressure.
- The core principles: intrathoracic pressure and systemic venous return, the U-shaped relationship between lung volume and PVR, transmural left-ventricular loading, and ventricular interdependence.
- The review applies them to cord clamping, CPAP, conventional and high-frequency ventilation, surfactant, the PDA, pulmonary hypertension phenotypes, elevated left-sided filling pressure and structural heart disease, and discusses targeted neonatal echocardiography for telling phenotypes apart.
- The bottom line, in the authors' words: respiratory management is hemodynamic management, whether we recognize it as such.
Where the evidence stops
- A narrative review offers a physiological framework. It does not, by itself, show that any particular ventilation or hemodynamic strategy improves outcomes.
- Applying the framework at the bedside depends on phenotyping each baby, which is where echocardiography and clinical judgment come in.
References
- Courchia B, Spénard S, Katz SL, Lapointe A, Canakis AM, Wazneh L, Cavallé-Garrido T, Sant'Anna G, Altit G. Beyond gas exchange, respiratory management is hemodynamic management in the preterm infant. Paediatr Respir Rev. 2026. doi:10.1016/j.prrv.2026.10.001 · Journal page
Independent educational content, not medical advice. Not affiliated with or endorsed by the AAP. Summaries reflect the published papers; read the originals before changing practice.
