Postural Changes in Pulmonary Blood Flow

Postural changes in pulmonary blood flow in pulmonary hypertension

We conclude that the postural shift in U:L ratio warrants further exploration as a noninvasive approach for detecting and quantifying pulmonary hypertension.

Postural Changes in Pulmonary Blood Flow in Pulmonary Hypertension: A Noninvasive. Technique Using Ventilation-Perfusion Scans-. MATTHEw HORN, M.D., WAYNE ...

Postural changes in pulmonary blood flow in pulmonary hypertension

The postural change in U:L zone ratio correlated significantly with the mean pulmonary arterial pressure (r = -0.84, p less than 0.01) pulmonary ...

Blood pressure and blood flow variation during postural change ...

Venous return is reduced, which leads to a decrease in cardiac stroke volume, a decline in arterial blood pressure, and an immediate decrease in blood flow to ...

the time course of a postural change on the pulmonary blood flow ...

It has been well established that a postural change causes an alteration in the pulmonary blood flow distribution. However, the precise time course of this ...

Changes in systemic and pulmonary blood flow distribution in ...

Changes in position resulted in a redistribution of blood flow within the left lung—supine positioning resulted in decreased blood flow to the ...

Effect of supine posture on airway blood flow and pulmonary ...

In acute and severe HF changes in posture may be characterized by an increase in dyspnea known as orthopnea. It has been hypothesized that ...

The effect of body position on pulmonary function: a systematic review

In heart failure, reduction in lung compliance in the supine position might reduce the passive change in lung volume, but FRC may be sustained ...

Physiological response to changes in posture

Standing from a supine position decreases venous return and therefore cardiac output. At the same time, hydrostatic pressure in the brain ...

The influence of gravity on regional lung blood flow in humans

All images were obtained supine during tidal breathing. A shift from upright to the head-down posture caused a clear redistribution of blood flow from basal to ...

Effects of posture on blood flow diversion by hypoxic pulmonary ...

v. P did not change with position but decreased during hypoxia. (table 1). Mean pulmonary artery pressure increased signifi- cantly with hypoxia (P:0.01) but ...

Postural changes in respiratory function - REHDER - 1998

The distribution of pulmonary blood flow is determined not only by gravity, but also by an intrinsic non-gravity dependent factor. These two ...

Cardiovascular Response to Posture Changes: Multiscale Modeling ...

Pressure and flow rate waveform analysis along the arterial tree together with mechano-energetic and oxygen consumption parameters highlighted ...

Timing and Magnitude of the Postural Effect on the... - Lippincott

These data confirm the importance of gravity in determining blood flow distribution in the lungs and demonstrate that maximum readjustments occur within 1 ...

the effect of posture on pulmonary capillary blood flow in man

Palo Alto, Calif. blood volume caused by changes in posture]; 4) hori- zontal, with the pneumatic cuffs still inflated; 5) hori-.

Blood flow and pulmonary ventilation: New paradigm? - Elsevier

Variations resulting from postural changes from supine to prone lead to variations in the distribution of pulmonary tissue. This theory is supported by the ...

Cardio-respiratory effects of change of body position

Anaesthesia and posture. Anaesthetised patients can be placed in a variety of surgical positions which may adversely affect both circulation and ventilation.

Timing and magnitude of the postural effect on the ... - OSTI.GOV

These data confirm the importance of gravity in determining blood flow distribution in the lungs and demonstrate that maximum readjustments occur within 1 ...

Effects of posture on regional pulmonary blood flow in rats as ...

We found that variance between the vertical gradients for prone and supine postures were the result of both the distribution of PBF within the lung and the ...

Cardiovascular Adjustments to Gravitational Stress. In

Pulmonary blood flow, measured with macroag- gregated human serum albumin ... blood flow, hydrostatic pressure changes in the cere- brospinal fluid ...