Pr interval 154. It comprises the P wave and the PR segment.
Pr interval 154. Nov 1, 2020 · For the six programs common to both studies, the population means found by Kligfield and colleagues [9] were 154, 90, and 421 ms for the PR interval, QRS duration, and QT interval, respectively, compared with 153, 95, and 401 ms in our study. In this step you should measure the interval from where the P wave begins until the beginning of the QRS complex. The PR interval includes the atrial depolarization and the propagation of the impulse through the AV node and the Conduction System until the Oct 8, 2024 · QT interval is the time from the start of the Q wave to the end of the T wave, time taken for ventricular depolarisation and repolarisation An ECG interval is the time between two specific ECG events. 12 sec). 36-0. The PR interval ranged from 154 +/- 10 ms (mean +/- SD) for HR less than or equal to 60 to 102 +/- 12 ms for HR greater than or equal to 120 (range 85-180). Methods and Results—The Health, Aging, and Body Composition (Health ABC We would like to show you a description here but the site won’t allow us. 13 second (3 to 6. The aim of this study was to investigate the association between PR interval and clinical outcome in patients undergoing radiofrequency catheter ablation (RFCA) of atrial fibrillation (AF). . We sought to determine the associations between PR interval and heart failure, AF, and mortality in a biracial cohort of older adults. 2 mV in men ≥40yo and ≥0. Normally, activation is slowest in the AV node, and variations in PR interval most commonly parallel changes in AV nodal activation time 2. The P-wave reflects atrial depolarization (activation). 36 – 0. 12-0. It also occurs naturally Interpretation: Normal sinus rhythm Possible anterior infarct Prolonged QT interval or TU fusion, consider myocardial disease, electrolyte imbalance, or drug effects In a large population of CRT patients, with fixed AV pacing delays, specific PR intervals are associated with significant benefits in terms of LV reverse remodeling and lower morbidity. 06-0. ST elevation: Suggests transmural ischemia; ≥0. Nov 8, 2021 · The PR Interval indicates AV conduction time, from the start of atrial depolarization to the start of ventricular depolarization (the QRS cømplex). 2 sec at any age c) QRS duration (2-3 small squares or 0. The aim of this study was to further elucidate clinical and prognostic importance of prolonged PR interval in a large middle-aged population with a When compared with ECG of 03-JAN-2014 13:17, the significant change is the development of Sinus tachycardia and Possible Biventricular hypertrophy VENTRICULAR RATE EKG/MIN 113 BPM PR-INTERVAL (MSEC) 154 ms QRS-INTERVAL (MSEC) 96 ms QT-INTERVAL (MSEC) 306 ms QTC 420 ms Mar 5, 2022 · PR interval represents the time taken for the electrical signals to conduct from upper most part of the atria to the beginning of the ventricles. 44s. If the PR interval is > 200 ms, first degree heart block is said to be present. WAVE OR INTERVAL DURATION (msec) P wave duration – <120 msec PR interval – <200 msec QRS duration – <110-120 msec QT interval (corrected) -≤440-450 msec Normal Values for Durations of ECG Waves and Intervals in Adults Normal Values for Durations of ECG Waves and Intervals in Adults PR interval >0,22 s: first-degree AV block. normal PR interval 0. P waves in sinus rhythm are positive in leads I, II and III. Another study from 1991 3 suggests that a PR interval greater than 240 ms is considered prolonged, but it does not provide a specific range for a heart rate of 60 per minute. Sometimes there is a prolonging pattern, sometimes not. g. If a PR interval is prolonged, the impulse from the sinoatrial node took too long to reach the intra-atrial pathways and the AV node. It reflects the conduction time through the atrioventricular node and can be influenced by the proximity of the ectopic focus to the SA node or AV junction. Unlike what happened with the first four cut-off values, Kaplan-Meyer analysis showed that a PR interval ≥220 ms (seen in 14 patients, versus 156 patients with a shorter PR interval) was associated with a decreased survival (p in log rank test of 0. The normal range for PR interval is: 0. 760 Fig. 12 seconds. Is a short PR interval dangerous/worrying? My cardiologist has said no, but I want a second opinion I guess. Normal QTc for females 0. 2 seconds. 20 seconds). Of the many formulae proposed to describe this relation, the most widely used formula for correcting the rate is that of Bazett 2. Description Measurement of the PR interval reflects the amount of time from the beginning of atrial depolarization to the beginning of ventricular depolarization. Sinus rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute; (2) P-wave precedes every QRS complex; (3) the P-wave is positive in lead II and (4) the PR interval is constant. 16 sec. The normal range is 120-200 milliseconds. It is normal in children, in well-conditioned athletes and other healthy people. lraven S!NUS BRADYCARDIA SINUS node is the pacemaker. 1 A global single measure of PR interval was calculated from the beginning of the P-wave to the beginning of the QRS. 20 seconds, which is the equivalent to 3-5 small squares (3-5 mm) on ECG paper An ECG is a graphical display of electrical energy generated by the heart over time. 80? did ekg as scheduled for surgery. The shape of the ST segments is concave upward, “smiling”. A prolonged PR interval is indicative of ______. 20s) in duration (three to five small squares). Apr 8, 2016 · However, PR variation and prolonged PR interval were not associated with all-cause mortality (P = 0. The PQ interval (sometimes referred to as the PR interval as a Q wave is not always present) indicates how fast the action potential Mar 10, 2020 · In 2007, Professor Breijo-Márquez described an electrocardiographic pattern, consisting of the presence of a short PR interval (or PQ) together with a short QT interval in the same individual. Sep 13, 2021 · The PQ interval The PQ duration depends on the conduction velocity in the atria, AV node, His bundle, bundle branches and Purkinje fibers The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction. Aug 16, 2025 · Learn how to interpret the PR interval on ECG — including normal physiology, how to measure it, causes of short and prolonged PR intervals, PR depression in pericarditis and atrial infarction, and clinical pearls for emergency medicine physicians. 08 second for the cat. The key intervals include PR, QRS, and QT intervals . A normal PR interval is 0. 12 s duration (3 small squares) for abnormally wide QRS Description Measurement of the PR interval reflects the amount of time from the beginning of atrial depolarization to the beginning of ventricular depolarization. 10 sec) The locus of stimulation is the same as normal sinus rhythm, just now the rate will be less than 60 bpm. Heart rate corrected PR was calculated using Soliman-Rautaharju formula (13). Plainly stated, PR interval measurement is from the beginning of the P wave to the beginning of the QRS complex. Since then until the present, this electrocardiographic model is The PR interval is the time between atrial depolarisation and ventricular depolarisation. This interval represents the time it takes for an electrical impulse to travel from the sinus node through the atria, AV node, bundle of His, and Purkinje fibers until the beginning of ventricular depolarization. What is a normal PR interval? A normal PR interval is 0. Most of the PR interval is taken by the slow conducting AV junction. 465 and 0. Mar 17, 2025 · The PR interval (normal between 0. 46s. shortness of breath, heart palpitations, minor physical effort making you feel tired)? Customer: I dnt have anything I had a kidney infection and they gave me a How to measure the pr interval on an ekg strip. This interval represents the time it takes f Jun 25, 2025 · A normal PR interval on an electrocardiogram (ECG) ranges from 120 to 200 milliseconds (0. We sought to determine the associations between PR interval and heart 0. (160 ms), the QRS complexes are narrow, and the QT interval is about 320 ms. Oct 6, 2025 · Master EKG interpretation with this easy cheat sheet. We would like to show you a description here but the site won’t allow us. Consecutive patients referred with suspected heart failure were prospectively enrolled. The electrocardiographic PR interval increases with aging, differs by race, and is associated with atrial fibrillation (AF), pacemaker implantation and all-cause mortality. Feb 27, 2025 · The normal PR interval on an electrocardiogram (ECG) ranges from 120 to 200 milliseconds (0. It increases gradually from age 3 6 months, onward to adolescence. There is a P wave (*) before each QRS complex, with a stable PR interval (0. 08-0. It was published with the headline “Decrease in cardiac electrical systole” in International Journal of Cardiology (IJC) [1]. Subjects were analyzed by PR interval, grouped by the median (180 ms) in 20-ms bins or as a continuous variable depending on the analysis performed. 20 seconds (3 to 5 small boxes) It is important that you measure each PR . Nov 7, 2024 · POTS P R interval: PR short PR long (1st degree AV block) Premature beats PAC PJC PVC Prominent T-waves PRWP P VC Q– waves QT interval: QT prolongation QT shortening R- wave transition: Early (Tall R in V1) Late (>V4) R- V1 is tall RAA R AD (right axis deviation) R BBB; partial RBBB R enal failure R etained S-wave in V6 rSr' in V1 R VH R VMI The P-wave, PR interval and PR segment ECG interpretation traditionally starts with an assessment of the P-wave. Oct 12, 2011 · Background: Underlying mechanisms of PR-interval prolongation leading to increased risk of adverse cardiovascular outcomes, including atrial fibrillation, are unclear. Which one of the following waveform assessments of the patient's ECG is most accurate? A Jun 11, 2024 · Review of first degree AV block with some ECG examples - PR interval > 200ms (five small squares) LITFL ECG Library To determine the prevalence, incidence, predictors, and prognostic implications of PR interval prolongation in patients referred with suspected heart failure. Prolongation of the electrocardiographic PR interval, known as first-degree atrioventricular block when the PR exceeds 200 milliseconds, is frequently encountered in clinical practice. 12–0. 1 mV, except for leads V2 to V3 (≥0. should i be concerned? Nov 8, 2021 · The normal range for PR interval is: 0. These observational data suggest the importance of optimizing pacing programming as a function of the PR interval to maximize CRT response and patient outcome. Get expert answers to your cardiology questions about PR interval normal range, BPM, QRS duration, and more. Customer: Hello I was wondering if u can explain my ekg Results to me Doctor's Assistant: The Cardiologist can help. Jun 24, 2014 · It has also been shown that in patients with HF, a prolonged PR interval is associated with unfavorable clinical outcome, 7, 8 and there is a benefit from shortening atrioventricular (AV) conduction delay in CRT patients. This is a normal sinus rhythm. This measurement represents the time it takes Jul 7, 2017 · b) PR interval varies with age and heart rate and is <0. The QRS complex measures less than . Plainly stated, this measurement is from the beginning of the P wave to the beginning of the QRS complex. A prolonged PR interval was defined as one longer than 200 ms based on initial ECG that was examined when initial Holter monitoring was performed. Afinal, trata-se de um trecho importante para Jan 26, 2025 · The PR interval is a crucial measurement in electrocardiograms (ECGs) that provides valuable insights into the heart's electrical conduction system. 12 – 0. It comprises the P wave and the PR segment. 12 O tema escolhido para falar foi como Identificar e avaliar o intervalo PR. Second-degree AV-block Mobitz type I (Wenckebach block): repeated cycles of gradually increasing PR interval until an atrial impulse (P-wave) is blocked in the atrioventricular node and the QRS complex does not appear. Mar 17, 2025 · Difference Between Segments and Intervals PR segment: line that connects the end of the P wave with the beginning of the QRS complex. 20 sec) QRS: Normal (0. Mar 17, 2025 · Normal QT interval: QT interval 380 ms, corrected QT interval 425 ms with HR of 75 bpm. P-wave duration and P-wave amplitude used in this report were the maximum value of these measures across the 12 leads. Other studies have shown worse outcomes among patients PR prolongation (16). Jul 26, 2017 · P wave PR interval QRS interval QRS complex and mean axis ST segment T wave U wave QT interval Use each of these checklists as you review 12-lead EKG cases from the EKG club, ECG Guru and EMS 12-Lead. e the upper reference limit). Accordingly, the present analysis was designed to evaluate the impact of PR interval on a variety of clinical outcomes in the REVERSE study. See full list on qaly. The PR interval is the distance between the onset of the P-wave to the onset of the QRS complex. Nov 10, 2022 · PR Interval: Normal (0. The normal interval is 0. PR Interval (measured from beginning of P to beginning of QRS in the frontal plane Jun 23, 2009 · A PR interval of less than 200 milliseconds is considered normal, and participants whose interval was longer than 200 milliseconds had twice the overall risk of developing atrial fibrillation, three times the risk of needing a pacemaker, and almost one and a half times the risk of early death. PR interval <0,12 s: Pre-excitation (WPW syndrome). The intervals are 98% confidence intervals (the mean is presented in the parenthesis). pedscases. Normal range of PR interval in an adult is 0. 12 and . Read on to learn more about identifying normal electrocardiogram intervals with examples. Electrically speaking, it covers atrial depolarization and the propagation of the the stimulus through the AV Node and the Bundle of Hiss. firing regularly at a rate Of less than 60 times per minute. Why? the PR interval starts at the up-slope of the P-wave, and ends and the first downward deflection of the R wave, What is a good system for identifying abnormal rhythms on an ECG? RRPV, A normal The PR interval measures between . Dec 31, 2024 · P waves: present, and each P wave is followed by a QRS complex PR interval: 120-200 ms (3-5 small squares) QRS complex: width <0. Abnormalities in the ECG Measurements Topics for study: Heart Rate PR Interval QRS Duration QT Interval QRS Axis Heart Rate In normal sinus rhythm, a resting heart rate of below 60 bpm is called bradycardia and a rate of above 90 bpm is called tachycardia. Normal ECG Normal ECG This tracing shows a normal ECG with sinus rhythm at about 75 per min. Changes to the PR interval often points to the AV junction. The most common intervals measured on an ECG are the PR interval, QRS interval, QT interval, The P-P interval, and the RR interval. Represents atrioventricular transmission of the electrical impulse generated by the SA node. A normal PR interval is 120–200 milliseconds long (0. Just a couple quick questions before I transfer you. Normal is 0. QTc is the QT interval corrected for the heart rate. 12 to 0. S amplitude in V6 is quite prominent after birth, decreasing progressively until adolescence (Table 2. 20 seconds (3 to 5 small boxes) It is important that you measure each PR interval on the rhythm strip. 5 boxes wide) for the dog and 0. Values without confidence interval are simply the 98 th percentile (i. But my PR interval is around 105-115ms Dec 20, 2021 · An electrocardiogram, abbreviated as an ECG or an EKG, measures the electrical activity in the heart and used to detect cardiac abnormalities. 12 s and 0. The PR interval is sometimes useful in monitoring the effects of digitalis therapy. co In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200 ms in duration. Learn what your ventricular rate, atrial rate, and PR interval mean. Normally ≤ 0. 74-year-old man is admitted to the ICU after a transcatheter aortic valve replacement. However we were unable to determine a cut-off value of PR interval variation for new-onset AF. com Jan 8, 2024 · An article from the cardiovascular medicine section of Primary Care Notebook: Prolonged PR interval. Get expert insights on ECG results like vent rate 99 bpm, PR interval 146, and more. 12 seconds, normal morphology and normal progression in chest leads (R wave amplitude increases from V1 to V6) ST segment: flat/isoelectric T waves: usually inverted in V1, and inversion in lead III is a normal variant This table provides a summary of ECG parameters for medical professionals. Dec 16, 2012 · Background—The electrocardiographic PR interval increases with aging, differs by race, and is associated with atrial fibrillation (AF), pacemaker implantation, and all-cause mortality. Dec 23, 2023 · The normal QTc interval is taken as 0. * The ST segments are not elevated or depressed. The flat Apr 24, 2025 · A study from 1988 2 found that the PR interval ranged from 154 +/- 10 ms for a heart rate less than or equal to 60. The PR interval is defined as the duration between the onset of atrial depolarization and the onset of ventricular depolarization, typically measuring ≥120 ms, and may vary based on the origin of ectopic beats. The normal range is: 0. e 12. BASIC ARRHYTHMIAS, 6th Edition. A prolonged or widened QRS complex may indicate that the impulse took too long to travel through the ventricles. Feb 4, 2021 · The normal PR interval is between 120 – 200 ms (0. PR interval variation and prolonged PR interval are independent risk factors for new-onset AF in patients with frequent PACs. 774, respectively). Negative T waves are normal in these leads. 04 seconds to determine the PR interval. 15 mV in women), measured at the J point. 20 s (3 - 5 small squares) for short PR segment consider Wolff-Parkinson-White syndrome or Lown-Ganong-Levine syndrome (other causes - Duchenne muscular dystrophy, type II glycogen storage disease (Pompe's), HOCM) for long PR interval see first degree heart block and 'trifasicular' block normal QRS complex < 0. Aug 1, 2017 · In addition, the long-term impact of PR interval was assessed in the cohort actively on CRT during the pre-planned 5-year follow-up. Understand your heart health and find answers to your questions today! Mar 17, 2025 · The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. 20 seconds. We hypothesized that this effect is more relevant in patients with non-LBBB and may identify responders to CRT with defibrillator (CRT-D). The PR interval is assessed in order to determine whether impulse conduction from the atria to the ventricles is normal. It’s not WPW becuase the QRS is normal and everything else is. PR interval The time between the beginning of the P wave and the beginning of the QRS complex (Q wave or R wave) on an ECG. Oct 7, 2014 · A prolonged PR interval is known to be a poor prognostic factor in cardiovascular disease. The interval should be measured in the lead with the largest, widest P wave and the longest QRS duration 1. Mar 17, 2025 · The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. The PR interval variation was calculated by subtracting the minimum PR interval from the maximum PR interval. Jun 4, 2016 · The underlying rhythm is sinus, with a remarkably long PR interval, and at least one episode of failure of the P wave to conduct, making "second-degree AV block, Type II" a possibility. Neonatal period Table 1. Isso é indispensável para a correta interpretação do eletrocardiograma. Apr 24, 2025 · PR Interval Length The PR interval on the electrocardiogram represents the time that it takes an impulse to travel through the atrium and atrioventricular (AV) conduction system to the ventricles 2. 20 seconds (3 to 5 small boxes) It is important that you measure each PR interval on the rhythm May 14, 2023 · This is an answer and interpretation to the ECG Case 154 The ECG shows a regular rhythm at a rate of 66 bpm. 2 PR interval in lead II, each curve corresponding to the indicated percentile level ( mean) The PR interval stays almost unchanged during early infancy. Jun 29, 2021 · Prolonged PR interval (first degree heart block) may be normal or be seen in: Viral or rheumatic myocarditis and other myocardial dysfunctions Certain congenital heart disease (Ebsteins, ECD, ASD) Digitalis toxicity Hyperkalaemia Short PR interval occurs in: Pre‐excitation (eg Wolff‐Parkinson‐White) Glycogen storage disease Variable PR interval occurs in: Wandering atrial pacemaker March 2020 Eric King (Medical Student, University of Alberta) for www. An ECG afterward revealed the following: normal sinus rhythm with heart rate, 98 beats/min; left bundle branch block (LBBB); PR, 168 milliseconds; QRS, 154 milliseconds; QT, 420 milliseconds; and QTc, 528 milliseconds. Sinus bradycardia is a sinus rhythm of under 60 beats per minute. Study with Quizlet and memorize flashcards containing terms like The P to R interval normally lasts less than ____ seconds, or _____ tiny squares. May 8, 2021 · Digoxin toxicity: scooping ST depressions. Jan 18, 2025 · PR interval >0,22 s: first-degree AV block. Kaplan-Meyer analysis was carried out with different cut-off values for the PR interval: 155 ms, 170 ms, 190 ms, 200 ms, 220 ms. Understanding what constitutes a normal PR interval is essential for healthcare professionals and patients alike. Learn the basics of ECG waves, intervals, and rhythms to improve cardiac assessment skills. The PR interval is measured from the onset of the P wave to the onset of the QRS complex, representing conduction from the onset of atrial depolarization until the onset of ventricular depolarization. To determine the clinical significance of PR prolongation in May 7, 2020 · The median change in PR interval from rest to peak exercise was -14 ms (-40 ms to +8 ms), while the median change in QT interval was -66 ms (-98 ms to -48 ms). PR interval: from the beginning of the P wave until the beginning of the QRS complex — that is, including the P wave. The normal QT interval in women is slightly higher than in men. 06 to 0. Multiply the number of small squares by 0. 009) (Fig. 20 seconds (3 to 5 small boxes) It is important that you measure each PR Mar 28, 2025 · The normal PR interval on an electrocardiogram (ECG) ranges from 120 to 200 milliseconds (0. 14 sec). A prolongation of the PR interval allows the diagnosis of a first degree AV block. The T waves are upright, except in Leads III and aVR. The P waves are upright in leads II, III, aVF, and V4-V6 and negative in lead aVR. PR Interval The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. Wide QRS may indicate bundle branch block or ventricular beats. In first-degree atrioventricular heart block, the PR interval is prolonged. Tutorial site on clinical electrocardiography (ECG)4. In order to correct, this corrected QT Sep 3, 2009 · Objectives To establish normal fetal values for the mechanical PR interval by pulsed-wave Doppler at 16–36 weeks of gestation, and to evaluate the influence of fetal heart rate (FHR), gestational ag Adult Rhythm Interpretation Guidelines Basic Steps for Interpreting Normal Range EKG’s Determining Heart Rate Six Second Method 300-150-100-75-60-50-43-37 Premature Dec 22, 2024 · The PR interval is about . The PR and ST segments represent the isoelectric interval between depolarization and repolarization of the atria and ventricles. d) QT interval (measured from the beginning of Q to the end of T waves). When the heart is lower the QT interval is longer and when the heart rate is higher the QT interval is shorter. Short PR intervals suggest the presence of Wolff-Parkinson-White syndrome A detailed view of the P-wave, PR interval and PR segment, with emphasis on ECG features, normal findings, normal variants and pathology. PR segment is the isoelectric interval on the ECG and can be used to assess ST segment elevation/depression. Normal limits for ECG parameters during neonatal period (Davignon et al) These reference values are the best available for the neonatal period. This study aims to investigate Jul 23, 2011 · Description and illustration of a normal ECG. All patients in the study (57/57) received CRT-D device follow-up in our center after stress testing. PR interval was significantly associated with the risk of the adverse outcomes investigated. Normal QTc for males 0. Aug 14, 2023 · Narrow and broad/Wide QRS complex morphology Low/high voltage QRS, differential diagnosis, causes and spot diagnosis on LITFL ECG library Oct 5, 2015 · Ekg: vent rate 56 bpm/pr interval 158 ms/qrs duration 80 ms/qt qtc 428-413 ms/prt 16 71. We evaluated atrioventricular conduction time (PR), heart rate (HR), and QT interval patterns defining the range of normality of these electrocardiographic parameters. The nonlinear relationships, in combination with relatively weak associations, could contribute to previously reported conflicting results on the subject. Feb 16, 2024 · The PR, QT, and RR intervals represent the duration of conduction through the AV node, the duration of ventricular depolarization to repolarization, and the duration between each cardiac cycle, respectively. It is an indicator of atrioventricular conduction time, involving conduction from the atria, through the AV node and down the His-Purkinje system. In abnormal atrial rhythms, P wave Vent rate 152 BPM, PR interval 118 ms, QRS duration 154 ms, QT/QTc 324/515 ms, P-R-T axes * 82 -63; Narrow-complex regular tachycardia, with rate suspicious for atrial flutter with 2:1 AV conduction. The heart rate has a direct impact on the QT interval. Given the relative paucity and conflicting data on PR interval in CRT, further study is warranted (19). What Intervals Are Included in an ECG? May 14, 2013 · Prolonged PR interval, or first degree AV block, has been traditionally regarded as a benign electrocardiographic finding in healthy individuals, until recent studies have suggested that it may be associated with increased mortality and morbidity. Some tracings do not have the same PRi measurement from one cardiac complex to the next. Sinus rhythm is identified as a narrow QRS rhythm with P waves preceding each QRS complex with a fixed and normal PR interval in the range of 120 to 200 msec. b' Gail W. Mar 9, 2025 · A normal PR interval on an electrocardiogram (ECG) ranges from 120 to 200 milliseconds (0. 20 s) should be measured from the beginning of the P wave to the beginning of the QRS complex. 20 seconds which represents 3 to 5 boxes. 20 seconds; the PRI measurement is constant across the strip. AI generated definition Sep 28, 2024 · To measure the PR interval, count the small squares on an electrocardiogram (ECG) from the beginning of the P wave (atrial depolarization) to the beginning of the R wave (ventricular depolarization). But with this formula, there is an overcorrection at high heart rates and undercorrection at lower heart rates 3. Can you tell me about all the symptoms you've experienced (e. This interval represents the time it takes f can some tells me what this means on my ECG? vent rate: 67bpm , RR Interval: 889ms; PR Interval: 142ms ; QRS Duration: 78ms, QT/QTc 406/418 , QT Dispersion: 32ms, P-R-T AXIS: 59 71 36 is this normal i also have hyperthyroidism some times i feel light-headed get chest pains feels nauseous very fatigue anxiety when i go up a hill or clime stairs Sinus rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute; (2) P-wave precedes every QRS complex; (3) the P-wave is positive in lead II and (4) the PR interval is constant. waivjdnyhq7tg9c84n3maxij8qwkk1exqdzq8jqkh3zzxrrr