tag:blogger.com,1999:blog-549949223388475481.post2930247474454846883..comments2024-03-26T22:42:04.176-05:00Comments on Dr. Smith's ECG Blog: Cold symptoms and bradycardia. What is this pre-excitation?Unknownnoreply@blogger.comBlogger13125tag:blogger.com,1999:blog-549949223388475481.post-86629187040908655572018-04-16T06:53:38.837-05:002018-04-16T06:53:38.837-05:00Fasciculoventricular, pseudo Delta waveFasciculoventricular, pseudo Delta waveSteve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-64687082020489361272018-04-15T09:58:50.705-05:002018-04-15T09:58:50.705-05:00Hello ! sorry but im not sure that im following , ...Hello ! sorry but im not sure that im following , so what was the correct answer ? or can't it be settled as the book says ( great book by the way) ? Anonymoushttps://www.blogger.com/profile/10142312163431658873noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-52322130027751413642014-11-24T15:54:41.308-06:002014-11-24T15:54:41.308-06:00Oddly enough, the bradycardia was seen in a (presu...Oddly enough, the bradycardia was seen in a (presumably) abstinent population, having completed meth detox.<br /><br />Something to keep an eye out for in the future, I suppse.Brooks Walshhttps://www.blogger.com/profile/16108633682893762401noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-84266971213056254522014-11-24T06:46:21.108-06:002014-11-24T06:46:21.108-06:00But that would be acute intoxication right?But that would be acute intoxication right?Steve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-26018485482771902972014-11-23T21:31:08.379-06:002014-11-23T21:31:08.379-06:00Not sure myself, just thinking that meth might cau...Not sure myself, just thinking that meth might cause a reflex bradycardia through the same putative mechanism as phenylephrine (stimulation of baroreceptors).<br />I found one study that found a surprisingly high prevalence of bradycardia in chronic meth users, much higher than the rate of tachycardia:https://www.google.com/url?sa=t&source=web&rct=j&ei=RKRyVNCfHITGsQSRu4LQBg&url=http://cfenet.ubc.ca/sites/default/files/uploads/Health%2520Conditions.pdf&ved=0CBwQFjAA&usg=AFQjCNHkAXxv1qpF_0rjeyl1alShUFF2Xg&sig2=nhCMMEUFBx2QYrgDLTQuIABrooks Walshhttps://www.blogger.com/profile/16108633682893762401noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-87495111287783143882014-11-08T00:58:57.350-06:002014-11-08T00:58:57.350-06:00With abnormal QRS's such as this, you expect d...With abnormal QRS's such as this, you expect discordance (ST-T opposite direction from QRS). Just like in paced rhythm or LBBB or PVCs.Steve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-84660165459208534732014-11-07T14:10:42.067-06:002014-11-07T14:10:42.067-06:00Hello, I'm still just getting the basics down ...Hello, I'm still just getting the basics down but would the inverted T waves in II and avF and the tall T waves in several of the precordial leads be indicative of anything?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-9152106426907616742014-11-06T16:27:42.389-06:002014-11-06T16:27:42.389-06:00Pre-excitation is a fusion beat: there is some dep...Pre-excitation is a fusion beat: there is some depolarization of the ventricle PRIOR to the arrival of an impulse through the conducting system. They fuse, with a delta wave representing the pre-excitation and the narrow part of the QRS the depolarization through the conducting system.<br /><br />Aberrancy is conducted FIRST via the conducting system and only later through non-conducting tissue. For instance, RBBB has normal conduction through the left conducting system, but the delay comes later when the right ventricle is depolarized through ventricular conduction alone.<br /><br />So one might conceive it such: pre-excitation has the slow conduction at the beginning of the QRS, aberrancy has it at the end of the QRSSteve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-13220489909859078992014-11-06T15:11:29.864-06:002014-11-06T15:11:29.864-06:00I clariified. See the post now.I clariified. See the post now.Steve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-64673317187959475142014-11-06T11:15:14.800-06:002014-11-06T11:15:14.800-06:00how do you differentiate preexitation vs aberrancy...how do you differentiate preexitation vs aberrancy in AF?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-11830686042167172252014-11-06T10:59:08.365-06:002014-11-06T10:59:08.365-06:00only delta wave (with normal PR interval) is also ...only delta wave (with normal PR interval) is also preexcitation? qrs with delta wave in AF is also preexcitation? what is pseudo delta wave? can you recommend article/literature for this subject? Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-65259955705729824682014-11-05T14:29:41.221-06:002014-11-05T14:29:41.221-06:00Brooks,
I don't see how it would be. do you?
...Brooks,<br />I don't see how it would be. do you?<br />SteveSteve Smithhttps://www.blogger.com/profile/08027289511840815536noreply@blogger.comtag:blogger.com,1999:blog-549949223388475481.post-70435153339740137042014-11-05T13:26:16.682-06:002014-11-05T13:26:16.682-06:00I've had a patient develop bradycardia with ph...I've had a patient develop bradycardia with phenylephrine. Any chance that the bradycardia ± AV block is caused by the methamphetamine use?Brooks Walshhttps://www.blogger.com/profile/16108633682893762401noreply@blogger.com