The effects of changes in blood volume on arterial pressure patterns during the Valsalva maneuver are incompletely understood. In the present study we measured beat-to-beat arterial pressure and heart rate responses to supine Valsalva maneuvers during normovolemia, hypovolemia induced with intravenous furosemide, and hypervolemia induced with ingestion of isotonic saline. Valsalva responses wer...

Circulation times (P32 from the antecubital and femnoral veins to a peripheral artery) and roentgenographic studies of the pattern of venous distribution of a radio-opaque substance (Diodrast introduced through a cardiac catheter into the axillary vein and'the inferior vena cava below the diaphragm) have been performed during the expiratory effort of the Valsalva maneuver. In normal subjects th...

BACKGROUND Patent foramen ovale as a possible stroke risk factor can be diagnosed with transcranial Doppler sonography (TCD) by detecting intravenous contrast medium crossing from the right to the left atrium. The present study evaluates the reliability of this method. SUMMARY OF REPORT We performed TCD and transesophageal echocardiography simultaneously in 50 patients using galactose microbu...

We describe a unique physical diagnostic sign that we have observed in seven patients with bronchopleurocutaneous fistulas. Such patients have a highpitched squeak over the affected chest area during sustained Valsalva maneuver. We postulate that turbulence across the bronchial fistula due to high transbronchial pressure gradient during the Valsalva maneuver produces the squeaking sound. The pi...

Respiratory and pharmacologic interventions are used during auscultation of heart sounds. These same principles may be utilized in the echocardiography laboratory to aid diagnosis. Four physical maneuvers and one pharmacologic intervention performed in the echocardiography laboratory are described. A brief discussion of applications in specific clinical situations is then presented. The Valsalv...

The Valsalva maneuver was performed by a series of eight patients with chronic Chagas' heart disease who had no current evidence nor past history of heart failure. The fact that all the patients showed recovery of arterial pressure during the latter portion of the period of increased airway pressure and exhibited significant overshoot in pressure in the post-straining period of the Valsalva man...

The effort that occurs during the Valsalva maneuver provokes a raise in intracranial pressure and may decompensate patients with increased intracranial pressure. The aims of this study were to evaluate the incidence of intestinal constipation in the preoperative period of patients with intracranial tumors and establish a relationship between constipation and intracranial pressure decompensation...

This study aimed to reveal principle movement strategies during successful 90° cutting maneuvers (CMs). Investigation of the pelvis rotation angle showed that subjects mainly use two strategies: one with most of the 90° cutting angle already realized within the body rotation prior to the transition step or one with the rotation executed after transition. These different turning strategies also ...

OBJECTIVE To compare two methods of respiratory inductive plethysmography (RIP) calibration in three different positions. METHODS We evaluated 28 healthy subjects (18 women and 10 men), with a mean age of 25.4 ± 3.9 years. For all of the subjects, isovolume maneuver calibration (ISOCAL) and qualitative diagnostic calibration (QDC) were used in the orthostatic, sitting, and supine positions. I...