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When atrial bigeminy is not transmitted to the ventricle, it will form a special bradyarrhythmia, which is easy to be misdiagnosed as sinus bradycardia or 2:1 sinoatrial block.
In atrioventricular block, the difference between P-P interval with QRS wave and P-P interval without QRS wave is more than 30ms, which can diagnose ventriculophasic sinus arrhythmia.
Only one of every two impulses generated by sinoatrial node can be transmitted to atrium, resulting in sinus P wave, and the other one is blocked, which is called 2:1 sinoatrial block.
In the general population, the distribution of normal QRS electrical axes is mostly located in the lower left quadrant, with a few located in the upper left quadrant.
In 2009, the standardized guidelines for electrocardiograms jointly issued by AHA, ACC, and HRS standardized the interpretation criteria for frontal QRS axis.
In a conventional 12 lead electrocardiogram, the polarity of the QRS main wave in leads I and III can be used to roughly determine whether the normal QRS axis and abnormal QRS axis.
In clinical practice, the most common type of second degree type I atrioventricular block is atypical Wenckebach's block, especially in cases where the atrioventricular conduction ratio exceeds 5:4.
When the PR interval changes and no P wave is blocked, it can only be called the Wenckebach periodidty. Only when the P wave is blocked can it be called Wenckebach block.
In atrial fibrillation, it is sometimes observed that the R-R interval is gradually shortened with sudden extension, which is actually the Wenckebach cycle.
When the frontal QRS axis is -22 °, it is oriented towards the upper left quadrant and projected onto the negative side of lead III axis, so the QRS main wave of lead III is negative.
Only one of every two impulses generated by sinoatrial node can be transmitted to atrium, resulting in sinus P wave, and the other one is blocked, which is called 2:1 sinoatrial block.
The ECG characteristic of 2∶1 atrioventricular block is that only one of every two P waves descends the ventricle and the other is blocked.
Under disease conditions, the potential relationship between left and right ventricular excitation changes, which is the mechanism of frontal QRS axis deviation.
In frontal lead system, leads Ⅱ, Ⅲ and aVF belong to anatomically contiguous lead and are combined into inferior lead group to explore diaphragmatic myocardium.
When the frontal plane axis is at+33 °, the maximum QRS excitation potential is most perpendicular to the axis of lead III, resulting in the lowest QRS wave amplitude in lead III.
這是一張人類小腸的組織學(xué)照片。放大倍數(shù)200倍
電脈沖可以傳導(dǎo)，但傳導(dǎo)速度減慢，導(dǎo)致傳導(dǎo)延遲并影響 P 波、PR 間期和 QRS 波的形態(tài)。
深紅螺旋菌是一種革蘭氏陰性、通常進行厭氧光養(yǎng)生活的螺旋形細菌。放大 400 倍
這是一張人類小腸的組織學(xué)照片，重點展示杯狀細胞，細胞內(nèi)可見黏液生成顆粒，細胞核位于底部。放大倍數(shù)為1000倍。
在額面導(dǎo)聯(lián)系統(tǒng)中，當(dāng)QRS波的初始向量向下時，在II、III和aVF導(dǎo)聯(lián)中記錄到正向的初始QRS波。
胸前導(dǎo)聯(lián)是一種用于檢測心臟橫向電活動的導(dǎo)聯(lián)系統(tǒng)，通常由放置在右胸和左胸前的六個電極組成。
成人竇性心率每分鐘低于60次被稱為竇性心動過緩。竇性心率每分鐘40至50次為中度竇性心動過緩，且患者存在竇性心動過緩
起源于右心室流出道的室性心動過速可以是持續(xù)性或短陣性的，是一種良性特發(fā)性室性心動過速。
當(dāng)竇性停搏發(fā)生時，心電圖將顯示長P - P間期，不是基礎(chǔ)竇性周期的倍數(shù)，包括生理和病理原因。
水螅是水螅綱的一小類淡水水螅，原產(chǎn)于溫帶和熱帶地區(qū)，具有再生能力且不會衰老。放大400倍
竇性心律失常是一種非常常見的良性心律失常，不需要治療。它可以通過竇性周期差異超過 120 毫秒或 160 毫秒來診斷。
在額面導(dǎo)聯(lián)系統(tǒng)中，6 個肢體導(dǎo)聯(lián)的導(dǎo)聯(lián)軸形成一個六軸參考系統(tǒng)，這是心電圖的重要理論之一。
The plane of the human body is divided into frontal, horizontal and lateral, and in electrocardiography, the frontal plane and horizontal plane are commonly used.
標(biāo)準(zhǔn)肢體導(dǎo)聯(lián)的導(dǎo)聯(lián)軸是等邊三角形的三條邊，單極肢體導(dǎo)聯(lián)的導(dǎo)聯(lián)軸是中垂線。
竇性沖動的頻率超過每分鐘 100 次，心電圖診斷為竇性心動過速。重要的鑒別診斷是房性心動過速。
The left main coronary artery can be divided into the left anterior descending artery and the left circumflex artery, and sometimes the intermediate branch artery.
This is a gross anatomy of the stomach. The stomach belongs to the digestive system and is the organ that digests food. Common stomach problems are chronic gastritis and gastric ulcers.
當(dāng)PR間期逐漸延長并伴有QRS波脫漏時，心電圖表現(xiàn)為二度I型房室傳導(dǎo)阻滯。多數(shù)阻滯部位在房室結(jié)。
猶大耳是一種食用和藥用真菌，可用于涼拌、燒烤、炒肉絲或煮湯。它非常美味且營養(yǎng)豐富。放大 40 倍
當(dāng)竇性周期變化超過120毫秒時，心電圖診斷為竇性心律失常，這是由竇房結(jié)起搏細胞發(fā)出的不規(guī)則沖動所導(dǎo)致的。
豬耳菌是一種食用和藥用真菌，可用于涼拌、燒烤、炒肉絲或煮湯。它非常美味且營養(yǎng)豐富。放大 40 倍
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