منابع مشابه
Preoperative electrocardiograms: patient factors predictive of abnormalities.
BACKGROUND Age is often the sole criterion for determining the need for preoperative electrocardiograms. However, screening electrocardiograms have not been shown to add value above clinical information. This study was designed to determine whether it is possible to target electrocardiograms ordering to patients most likely to have an abnormality that would affect management and if age alone is...
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THE anticipated value of the preoperative electrocardiogram for the assessment of perioperative cardiac risk has changed over the past decades. Initial risk scores included preoperative electrocardiogram variables as a prognostic factor for the occurrence of perioperative cardiac events; in recent years, however, the value of a routine preoperative electrocardiogram has been questioned. The cur...
متن کاملInteresting electrocardiograms.
The ECG showed normal sinus rhythm at 65 per min., with a very short P-R interval (0.10 sec.). On the fourth beat of the first lead set (simultaneous leads I, II, III), which is marked with an arrow, there is an atrial premature, contraction. This latter beat has a low, rather flat P wave preceding the QRS with a P-R interval of 0.20 sec. The contrast between the sinus beats (with short PR) and...
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The pericardium surrounds the heart and consists of a visceral layer, which is contiguous with the epicardium of the heart, and a parietal layer, which forms a sac around the heart (Wann & Passen, 2008). Located between the parietal and visceral layers is a potential space called the pericardial cavity. The pericardial cavity normally contains as much as 50 mL of an ultrafiltrate of plasma. Ana...
متن کاملCancellation of esophageal electrocardiograms.
Cancellation of juxtacardiac esophageal electrocardiograms, as demonstrated in this study, indicates certain limitations of the equivalent cardiac dipole hypothesis. A new and more fundamental theory developed here shows that in large measure cancellation occurs because the cancellation network is in effect a relatively insensitive electrocardiographic connection, and because there is always pr...
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ژورنال
عنوان ژورنال: Anesthesiology
سال: 2009
ISSN: 0003-3022
DOI: 10.1097/aln.0b013e31819fb139