Exploring pulse transit time as a potential indicator of blood pressure: a scientific inquiry

Non-invasive continuous blood pressure (BP) monitoring is crucial, especially in critical care settings. While pulse transit time (PTT) has been used for cuffless BP monitoring, it requires accurate detection of pulse waves at arterial sites, which can be uncomfortable for patients. Pulse arrival time (PAT), the interval between the ECG Q-wave and pulse arrival at a distant site, offers a potentially less invasive approach for BP estimation. However, the reliability of PAT as a BP indicator remains uncertain. This study aimed to evaluate the feasibility of using PAT as a continuous, non-invasive BP monitoring method. Data from 37 subjects, including PAT and BP measurements, were analyzed. Statistical analysis revealed a weak correlation (r = 0.17) between PAT and BP, suggesting that PAT may not be a reliable standalone method for BP measurement. These findings indicate that further research is necessary to address the limitations of PAT and explore its potential as a supplementary tool for BP monitoring in clinical settings.