BACKGROUND Conventional supine emergence in patients undergoing prone lumbar surgery frequently results in tachycardia, hypertension, coughing, and loss of monitoring as the patient is rolled supine. The prone position might facilitate a smoother emergence because the patient is not disturbed. No data describe this technique. METHODS Fifty patients were anesthetized with fentanyl, nitrous oxi...

We examined potential mechanisms (autonomic function, hypotension, and cerebral hypoperfusion) responsible for orthostatic intolerance following prolonged exercise. Autonomic function and cerebral hemodynamics were monitored in seven athletes pre-, post- (<4 h), and 48 h following a mountain marathon [42.2 km; cumulative gain approximately 1,000 m; approximately 15 degrees C; completion time, 2...

The influence of head position on thermal stress was assessed by using a heavily clothed thermal mannequin in three different body positions [supine, face straight up (FSU); supine, face to the side (FTS); prone, FTS] and with or without the head covered by a bonnet. The mannequin was exposed to air temperatures of 29, 32, 34, and 36 degrees C. When the head is uncovered, body or head position ...

During supine passive heating, increases in skin blood flow (SkBF) and cardiac output (Qc) are both blunted in older adults. The aim here was to determine the effect of acutely correcting the peripheral vasodilatory capacity of aged skin on the integrated cardiovascular responses to passive heating. A secondary aim was to examine the SkBF-Qc relation during hyperthermia in the presence (upright...

OBJECTIVE Holodiastolic arterial blood flow is associated with pathological conditions. Nevertheless, we have observed that lifting the arm at an angle greater than the horizontal causes holodiastolic arterial blood flow in the brachial artery in normal patients. Thus, we decided to assess the frequency and characteristics of this phenomenon. MATERIAL AND METHODS Ten volunteers (7 women) aged...

Diagnosis and effective treatment of obstructive sleep apnea syndrome (OSA) in adults is an important health priority. Home respiratory polygraphy a cost-effective alternative to polysomnography OSA. The aim this study was investigate the variability two consecutive home polygraphic examinations by comparing severity characteristics pattern (supine dominant, continuous, etc.) variability. We ex...

The ventricular response to passive heat stress has predominantly been studied in the supine position. It is presently unclear how acute changes in venous return influence ventricular function during heat stress. To address this question, left ventricular (LV) systolic and diastolic function were studied in 17 healthy men (24.3 ± 4.0 yr; mean ± SD), using two-dimensional transthoracic echocardi...

The fact that operating a patient in the supine position is easier than in a prone position is rather intuitive: apart from PCNL and, obviously, spinal surgery, there is no surgery of retroperitoneal organs performed in the prone position. So, why is it that nowadays PCNL is performed in the supine position only in 20% of cases worldwide? [1]. Indeed, the prone position was adopted in the pione...

Supine hypertension is difficult to manage in patients with pure autonomic failure (PAF), because treatment can worsen orthostatic hypotension. Supine hypertension in PAF has been associated with left ventricular hypertrophy, but end organ damage in the kidney has not been assessed. We reviewed hemodynamic and laboratory data of 64 male patients with PAF who were 69 11 (mean SD) years old. Syst...

BACKGROUND Severe obesity causes respiratory morbidity and mortality. The impact of obesity on the mechanics of breathing is not fully understood. PATIENTS AND METHODS We undertook a comprehensive observational study of lung volumes and elasticity in nine obese and nine normal weight subjects, seated and supine, during spontaneous breathing. Seated and supine total lung capacity (TLC) and sub...