# Head Up Cardiopulmonary Resuscitation: Novel Physiological Discoveries and Latest Clinical Outcomes

## TL;DR

A new CPR method called head-up CPR improves blood flow and brain outcomes during cardiac arrest by altering chest compression techniques.

## Contribution

Automated head-up CPR (AHUP-CPR) is introduced as a novel approach combining active compression-decompression and intrathoracic pressure control to enhance resuscitation.

## Key findings

- AHUP-CPR generates favorable negative intrathoracic pressure, improving cerebral venous drainage and right heart preload.
- Pressure-volume loop analysis reveals AHUP-CPR enhances stroke volume and end-tidal CO2 during cardiac arrest.
- AHUP-CPR improves circulatory efficiency and neurological outcomes compared to conventional CPR.

## Abstract

Despite decades of research, survival rates following cardiac arrest remain dismal. The recent use of pressure-volume (PV) loop analysis has provided important insights into the underlying physiology of cardiopulmonary resuscitation (CPR). During conventional CPR (C-CPR), ventricular ejection is limited, contributing to poor circulatory effectiveness. In contrast, automated head-up CPR (AHUP-CPR)—which combines active compression-decompression (ACD) CPR, an impedance threshold device (ITD), and controlled head-thorax elevation—generates favorable negative intrathoracic pressure, promoting cerebral venous drainage and increases right heart preload, resulting in enhanced stroke volume, cardiac output, and end-tidal CO2 (ETCO2) by improving ventricular–pulmonary–arterial circulation. This article summarizes recent advances related to AHUP-CPR with a focus on novel physiological findings derived from intraventricular conductance catheter recordings during ventricular fibrillation, C-CPR, and AHUP-CPR. The PV loop observations shed new light on the mechanisms through which AHUP-CPR improves circulatory efficiency and neurological outcomes.