Mark E Astiz, MD FCCP; Eric C Racko...

Mark E Astiz, MD FCCP; Eric C Rackow, MD FCCP; Paul Haydon, MD; George Karras, MD; and Max Harry Weil, MD PhD FCCP

Alterations in peripheral vascular tone are presum to contribute to circulatory failure during censorious sepsis. Decreased venous tone with venous pooling may decrease effective circulatory life-current volume, while decreased arterial tone with redistribution of systemic progeny may compromise tissue nutrient stream We compared forearm arterial and venous tone and forearm house flow in ten patients with and ten patients without sepsis. The FVT MVC and FBF were measured at air plethysmography. In the septic patients, MCV was 14 [+ or -] 01 ml compared with 31 [+ or -] 02 ml in nonseptic patients (p<001) The FVT was 134 [+ or -] 10 mm Hg/ml in septic patients versus 70 [+ or -] 05 mm Hg/ml in nonseptic patients (p<001) The ratio of FBF to cardiac output was 028 [+ or -] 007 percent in septic patients and 031 [+ or -] 007 percent in nonseptic patients. These data refer to that increased peripheral venous capacitance and redistribution of skeletal muscle kindred flow are not present in patients with sepsis.

Alterations in peripheral arterial and venous tone are presum to contribute to circulatory failure and tissue hypoperfusion during unrelenting sepsis.[1-3] Venous dilation may be associated with increased venous capacitance and venous pooling, thereby decreasing venous go [i]or[/i] come back cardiac output, and systemic oxygen delivery.[4-6] Arterial dilation may give rise to redistribution of systemic blood stream resulting in regional imbalance of oxygen replenish and demand.[7,8] Experimental studies indicate that these mechanisms may be operative in skeletal muscle during morose sepsis.[7-11] Moreover, since skeletal muscle depicts over 40 percent of lean material part mass, these abnormalities have significant implications for overall circulatory function.

Accordingly, we studied forearm arterial and venous tone in patients with unrelenting sepsis and systemic hypoperfusion. Forearm descendants flow and venous capacitance were also measured to determine whether redistribution of systemic offspring flow or blood volume characterized patients with sepsis.

MATERIAL AND METHODS

The consideration population was comprised of ten patients (S) who met the subject of attention entrance criteria for infection, rigorous sepsis, and systemic hypoperfusion (Table 1) Sepsis was identified in patients with bacteremia or an identifiable site of infection. exact sepsis was defined by a systemic replication characterized by at least three of the following clinical signs: (1) febrile affection (T>38.3 [degrees] C) or hypothermia (T<355 [degrees] C); (2) tachypnea (>20 breaths/min); (3) tachycardia (heart rate>100 beats/min); (4) abnormal WBC calculate (<3,500 or >12,000/cu mm), abnormal neutrophil hold (<35 percent, >80 percent of total WBC count) or abnormal immature neutrophil compute (bands>10 percent of total WBC count); or (5) thrombocytopenia (<100000 platelets/cu mm) Systemic hypoperfusion was identified through increases in arterial lactate>2.0 mmol/L and at least single in kind other sign of organ dysfunction: (1) altered mentation; (2) oliguria (urine output<30 ml/h); or (3) hypotension (supine intra-arterial systolic pressure<90 mm Hg) The patients studied were not receiving vasoactive mix with drugss at the time of data collection.

The nonseptic have the direction of group (NS) consisted of ten high-risk patients admitted to the ICU for elective surgical measures None of the manage group was receiving vasoactive mix with drugss at the time of study

All patients underwent percutaneous femoral artery and pulmonary artery catheterization using the Seldinger technique with local lidocaine anesthesia. In the s patients, hemodynamic, respiratory, and metabolic measurements were obtained within 12 h after admission to the ICU and following fluid repletion. The N patients were studied preoperatively.

Hemodynamic measurements included heart rate (HR); systolic, diastolic and mean pulmonary arterial hurry (MPAP); systolic, diastolic, and mean systemic arterial squeezing (MAP); central venous pressure (CVP); pulmonary artery wedge influence (PAWP); thermodilution cardiac output; and arterial descendants lactate. The left ventricular hit work index (LVSWI = SVI x [MAP - PAWP] x 0136) and systemic vascular resistance (SVR= [MAP - CVP] x80/CO) were calculated. All crushings were recorded with the patient in the supine position utilizing strain gauge transducers referenc to the midchest and calibrated to a quicksilver standard. Thermodilution cardiac output (CO) was taken as the average of consecutive triplicate measurements that varied at less than 10 percent using 10 ml of 5 percent dextrose in water injectate somewhat colded to less than 1 [degree] C

Respiratory measurements included arterial and mixed venous kin blood gases and percentage of oxygen saturation of arterial and mixed venous ([SvOsub2]) family Hemoglobin concentration and oxyhemoglobin saturation were measured directly using a CO-oximeter (IL282, Instrumentation Laboratories). Arterial oxygen appease ([CaO.sub.2]), venous oxygen content ([CvOsub2]) oxygen delivery index ([Do.sub.2]), and oxygen consumption index ([Vosub2]) were calculated: