🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 129 (from laksa058)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa129.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.nhlbi.nih.gov/health/arrhythmias\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.nhlbi.nih.gov/health/arrhythmias\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias","crawl_time":1775043648,"first_indexed_time":1648179558,"http_code":200,"src_unparsed":"gov,nih!nhlbi,www,\/health\/arrhythmias s443","src_root_hash":"7295144728021232729","history_drop_reason":null,"meta_title":"Arrhythmias - What Is an Arrhythmia? | NHLBI, NIH","meta_descriptions":["An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart may beat too fast, too slowly, or with an irregular rhythm. Learn about the causes, symptoms, and treatments for arrhythmia."],"attrs_boilerpipe_text":"Learn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia.\nMedical Animation Copyright © Nucleus Medical Media, All rights reserved.\n(link is external)\nAn arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm.\nIt is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other\nsymptoms\n. \nArrhythmias are\ntreatable\nwith medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening\nstroke\n,\nheart failure\n, or\ncardiac arrest\n. During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes.\nIf you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from\ngetting worse\n. ","attrs_markdown":"[Skip to main content](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias#main-content)\n\n![U.S. flag](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/assets\/uswds\/dist\/img\/us_flag_small.png)\n\nAn official website of the United States government\n\nHere’s how you know\n\nHere’s how you know\n\n![](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/assets\/uswds\/dist\/img\/icon-dot-gov.svg)\n\n**Official websites use .gov**  \n A **.gov** website belongs to an official government organization in the United States.\n\n![](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/assets\/uswds\/dist\/img\/icon-https.svg)\n\n**Secure .gov websites use HTTPS**  \n A **lock** ( A locked padlock ) or **https:\/\/** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.\n\n[![National Heart, Lung, and Blood Home](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/NHLBI-logo.svg)](https:\/\/www.nhlbi.nih.gov\/)\n\n- Health Topics\n  - [All Health Topics A-Z](https:\/\/www.nhlbi.nih.gov\/health)\n    - [Asthma](https:\/\/www.nhlbi.nih.gov\/health\/asthma)\n    - [Heart-Healthy Living](https:\/\/www.nhlbi.nih.gov\/health\/heart-healthy-living)\n    - [High Blood Pressure](https:\/\/www.nhlbi.nih.gov\/health\/high-blood-pressure)\n    - [Sickle Cell Disease](https:\/\/www.nhlbi.nih.gov\/health\/sickle-cell-disease)\n    - [Sleep Apnea](https:\/\/www.nhlbi.nih.gov\/health\/sleep-apnea)\n  - [Calculate Your BMI](https:\/\/www.nhlbi.nih.gov\/calculate-your-bmi)\n- Health Education\n  - [Education Programs and Initiatives](https:\/\/www.nhlbi.nih.gov\/education)\n    - [The Heart Truth®](https:\/\/www.nhlbi.nih.gov\/health-topics\/education-and-awareness\/heart-truth)\n    - [Learn More Breathe Better®](https:\/\/www.nhlbi.nih.gov\/BreatheBetter)\n    - [Blood Diseases & Disorders Education Program](https:\/\/www.nhlbi.nih.gov\/education\/blood)\n  - [Publications and Resources](https:\/\/www.nhlbi.nih.gov\/resources?language%5BEnglish%5D=English)\n- Research\n  - [Clinical Trials and Studies](https:\/\/www.nhlbi.nih.gov\/research\/clinical-trials)\n  - [Research Focus Areas](https:\/\/www.nhlbi.nih.gov\/science)\n    - [Blood Disorders and Blood Safety](https:\/\/www.nhlbi.nih.gov\/science\/blood-disorders-and-blood-safety)\n    - [Sleep Science and Sleep Disorders](https:\/\/www.nhlbi.nih.gov\/science\/sleep-science-and-sleep-disorders)\n    - [Lung Diseases](https:\/\/www.nhlbi.nih.gov\/science\/lung-diseases)\n    - [Health Disparities](https:\/\/www.nhlbi.nih.gov\/science\/health-disparities)\n    - [Heart and Vascular Diseases](https:\/\/www.nhlbi.nih.gov\/science\/heart-and-vascular-diseases)\n    - [Precision Medicine Activities](https:\/\/www.nhlbi.nih.gov\/science\/precision-medicine-activities)\n    - [Obesity, Nutrition, and Physical Activity](https:\/\/www.nhlbi.nih.gov\/science\/obesity-nutrition-and-physical-activity)\n    - [Population and Epidemiology Studies](https:\/\/www.nhlbi.nih.gov\/science\/population-and-epidemiology-studies)\n    - [Women’s Health](https:\/\/www.nhlbi.nih.gov\/science\/womens-health)\n  - [Research Topics](https:\/\/www.nhlbi.nih.gov\/research\/research-topics)\n  - [All Science A-Z](https:\/\/www.nhlbi.nih.gov\/science\/all-science)\n- Grants and Training\n  - [Grants and Training Home](https:\/\/www.nhlbi.nih.gov\/grants-and-training)\n  - [Policies and Guidelines](https:\/\/www.nhlbi.nih.gov\/grants-and-training\/policies-procedures-and-guidelines)\n  - [Funding Opportunities and Contacts](https:\/\/www.nhlbi.nih.gov\/grants-and-training\/funding-opportunities-and-contacts)\n  - [Training and Career Development](https:\/\/www.nhlbi.nih.gov\/grants-and-training\/training-and-career-development)\n- News and Events\n  - [News and Events Home](https:\/\/www.nhlbi.nih.gov\/news-and-events)\n    - [Email Alerts](https:\/\/www.nhlbi.nih.gov\/news-and-events\/email-alerts)\n  - [All News](https:\/\/www.nhlbi.nih.gov\/news)\n    - [NHLBI News](https:\/\/www.nhlbi.nih.gov\/news?type%5Bpress_release%5D=press_release)\n    - [NHLBI in the Press](https:\/\/www.nhlbi.nih.gov\/news?type%5Bnews_mention%5D=news_mention)\n    - [Featured Article](https:\/\/www.nhlbi.nih.gov\/news?type%5Bfeature_article%5D=feature_article)\n    - [Ask a Scientist](https:\/\/www.nhlbi.nih.gov\/ask-a-scientist)\n  - [All Events](https:\/\/www.nhlbi.nih.gov\/events)\n    - [Past Events](https:\/\/www.nhlbi.nih.gov\/events?field_event_status%5Bclosed%5D=closed)\n    - [Upcoming Events](https:\/\/www.nhlbi.nih.gov\/events?field_event_status%5Bupcoming%5D=upcoming)\n- About NHLBI\n  - [About NHLBI Home](https:\/\/www.nhlbi.nih.gov\/about)\n    - [Mission and Strategic Vision](https:\/\/www.nhlbi.nih.gov\/about\/strategic-vision)\n    - [Leadership](https:\/\/www.nhlbi.nih.gov\/about\/leadership)\n    - [Divisions, Offices and Centers](https:\/\/www.nhlbi.nih.gov\/about\/divisions)\n    - [Advisory Committees](https:\/\/www.nhlbi.nih.gov\/about\/advisory-and-peer-review-committees)\n    - [Budget and Legislative Information](https:\/\/www.nhlbi.nih.gov\/about\/budget-and-legislative-information)\n    - [Jobs and Working at the NHLBI](https:\/\/www.nhlbi.nih.gov\/about\/working-at-nhlbi)\n    - [Contact and FAQs](https:\/\/www.nhlbi.nih.gov\/contact)\n    - [NIH Sleep Research Plan](https:\/\/www.nhlbi.nih.gov\/sleep-research-plan)\n- [HOME](https:\/\/www.nhlbi.nih.gov\/)\n\nArrhythmias\n\n- [Home](https:\/\/www.nhlbi.nih.gov\/)\n- [\\< Back To Health Topics](https:\/\/www.nhlbi.nih.gov\/node\/93751)\n- Arrhythmias\n\n0\n\n[Arrhythmias](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n\n[MENU]()\n\n- [Home](https:\/\/www.nhlbi.nih.gov\/)\n- [\\< Back To Health Topics](https:\/\/www.nhlbi.nih.gov\/node\/93751)\n- Arrhythmias\n\n- [What Is an Arrhythmia?](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n- [Types](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/types)\n- [Symptoms](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/symptoms)\n- [Diagnosis](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/diagnosis)\n- [Causes and Triggers](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/causes)\n- [Treatment](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/treatment)\n- [Living With](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/living-with)\n- [Related Conditions](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n  - [Conduction Disorders](https:\/\/www.nhlbi.nih.gov\/health\/conduction-disorders)\n  - [Long QT Syndrome](https:\/\/www.nhlbi.nih.gov\/health\/long-qt-syndrome)\n  - [Wolff-Parkinson-White Syndrome](https:\/\/www.nhlbi.nih.gov\/health\/wolff-parkinson-white-syndrome)\n\nMORE INFORMATION\n\n[Participate in a Study](https:\/\/www.nhlbi.nih.gov\/research\/clinical-trials?f%5B0%5D=disease_or_condition_name%3AArrhythmias)\n\n[Research](https:\/\/www.nhlbi.nih.gov\/research\/arrhythmias)\n\nArrhythmias\n\n# Arrhythmias What Is an Arrhythmia?\n[![Share](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/share-alt-icon.svg)](https:\/\/www.addtoany.com\/share#url=https%3A%2F%2Fwww.nhlbi.nih.gov%2Fhealth%2Farrhythmias&title=What%20Is%20an%20Arrhythmia%3F \"Share\")\n\n[Email](https:\/\/www.nhlbi.nih.gov\/#email \"Email\")\n\n[Print](https:\/\/www.nhlbi.nih.gov\/#print \"Print\")\n\n## Language switcher\n- [English](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n- [Español](https:\/\/www.nhlbi.nih.gov\/es\/salud\/arritmias)\n\nLearn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia. [*Medical Animation Copyright © Nucleus Medical Media, All rights reserved.*](https:\/\/catalog.nucleusmedicalmedia.com\/) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n\nAn arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm.\n\nIt is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other [symptoms](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/symptoms).\n\nArrhythmias are [treatable](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/treatment) with medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening [stroke](https:\/\/www.nhlbi.nih.gov\/health\/stroke), [heart failure](https:\/\/www.nhlbi.nih.gov\/health\/heart-failure), or [cardiac arrest](https:\/\/www.nhlbi.nih.gov\/health\/cardiac-arrest). During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes.\n\nIf you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from [getting worse](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/living-with).\n\n### Book traversal links for Arrhythmias\n- #### Next\n  [Types](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/types \"Go to next page\")\n\nLast updated on\n\nMarch 24, 2022\n\nBack To Top Link\n\n[Back to top](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias#main-content)\n\nWeb Policies & Notices\n\n- [Accessibility](https:\/\/www.nhlbi.nih.gov\/about\/contact\/website-privacy-and-accessibility)\n- [No FEAR Act Data](https:\/\/eeo.nih.gov\/no-fear-act)\n- [Privacy Policy](https:\/\/www.nhlbi.nih.gov\/about\/contact\/website-privacy-and-accessibility\/privacy-statement)\n- [Freedom of Information Act (FOIA)](https:\/\/www.nhlbi.nih.gov\/about\/contact\/website-privacy-and-accessibility)\n- [HHS Vulnerability Disclosure](https:\/\/www.hhs.gov\/vulnerability-disclosure-policy\/index.html) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n\nRelated Government Websites\n\n- [Health and Human Services](https:\/\/www.hhs.gov\/) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n- [National Institutes of Health](https:\/\/www.nih.gov\/)\n- [Office of the Inspector General](https:\/\/oig.hhs.gov\/) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n- [USA.gov](https:\/\/www.usa.gov\/) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n\nStay Connected\n\n- ![chat bubbles](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/messages-question-regular.svg) [Live Chat](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n  Live Chat with us, Monday through Friday, 8:30 a.m. to 5:00 p.m. EST.\n- ![envelope](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/envelope-open-text-solid.svg)[Get Email Alerts](https:\/\/www.nhlbi.nih.gov\/news-and-events\/email-alerts)\n  Receive automatic alerts about NHLBI related news and highlights from across the Institute.\n\nFooter Bottom\n\n[![National Heart, Lung, and Blood Home](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/NHLBI_HHS_Lockup_white.svg)](https:\/\/www.nhlbi.nih.gov\/)\n\n- [Contact Us](https:\/\/www.nhlbi.nih.gov\/contact)\n- [Site Index](https:\/\/www.nhlbi.nih.gov\/siteindex)\n- [Jobs](https:\/\/www.nhlbi.nih.gov\/about\/working-at-nhlbi)\n\n- [![Facebook social media](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/ico-facebook-white.svg)](https:\/\/www.facebook.com\/NIH.NHLBI)\n- [![Youtube social media](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/ico-youtube-white.svg)](https:\/\/www.youtube.com\/user\/NHLBI)\n- [![LinkedIn social media](https:\/\/www.nhlbi.nih.gov\/themes\/custom\/nhlbi\/images\/linkedin-brands.svg)](https:\/\/www.linkedin.com\/company\/national-heart-lung-and-blood-institute)\n\n✓\n\nThanks for sharing\\!\n\n[AddToAny](https:\/\/www.addtoany.com\/ \"Share Buttons\")\n\n[More…](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias#addtoany \"Show all\")\n\nExternal Web Site Policy\n\nClose\n\nOK","attrs_readable_markdown":"Learn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia. [*Medical Animation Copyright © Nucleus Medical Media, All rights reserved.*](https:\/\/catalog.nucleusmedicalmedia.com\/) [(link is external)](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias)\n\nAn arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm.\n\nIt is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other [symptoms](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/symptoms).\n\nArrhythmias are [treatable](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/treatment) with medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening [stroke](https:\/\/www.nhlbi.nih.gov\/health\/stroke), [heart failure](https:\/\/www.nhlbi.nih.gov\/health\/heart-failure), or [cardiac arrest](https:\/\/www.nhlbi.nih.gov\/health\/cardiac-arrest). During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes.\n\nIf you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from [getting worse](https:\/\/www.nhlbi.nih.gov\/health\/arrhythmias\/living-with).","meta_canonical":null}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

16 days ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	0.5 months ago
History drop	PASS	`isNull(history_drop_reason)`	No drop reason
Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property	Value
URL	https://www.nhlbi.nih.gov/health/arrhythmias
Last Crawled	2026-04-01 11:40:48 (16 days ago)
First Indexed	2022-03-25 03:39:18 (4 years ago)
HTTP Status Code	200
Meta Title	Arrhythmias - What Is an Arrhythmia? \| NHLBI, NIH
Meta Description	An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart may beat too fast, too slowly, or with an irregular rhythm. Learn about the causes, symptoms, and treatments for arrhythmia.
Meta Canonical	null
Boilerpipe Text	Learn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia. Medical Animation Copyright © Nucleus Medical Media, All rights reserved. (link is external) An arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm. It is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other symptoms . Arrhythmias are treatable with medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening stroke , heart failure , or cardiac arrest . During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes. If you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from getting worse .
Markdown	[Skip to main content](https://www.nhlbi.nih.gov/health/arrhythmias#main-content) ![U.S. flag](https://www.nhlbi.nih.gov/themes/custom/nhlbi/assets/uswds/dist/img/us_flag_small.png) An official website of the United States government Here’s how you know Here’s how you know ![](https://www.nhlbi.nih.gov/themes/custom/nhlbi/assets/uswds/dist/img/icon-dot-gov.svg) Official websites use .gov A .gov website belongs to an official government organization in the United States. ![](https://www.nhlbi.nih.gov/themes/custom/nhlbi/assets/uswds/dist/img/icon-https.svg) Secure .gov websites use HTTPS A lock ( A locked padlock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. [![National Heart, Lung, and Blood Home](https://www.nhlbi.nih.gov/themes/custom/nhlbi/images/NHLBI-logo.svg)](https://www.nhlbi.nih.gov/) - Health Topics - [All Health Topics A-Z](https://www.nhlbi.nih.gov/health) - [Asthma](https://www.nhlbi.nih.gov/health/asthma) - [Heart-Healthy Living](https://www.nhlbi.nih.gov/health/heart-healthy-living) - [High Blood Pressure](https://www.nhlbi.nih.gov/health/high-blood-pressure) - [Sickle Cell Disease](https://www.nhlbi.nih.gov/health/sickle-cell-disease) - [Sleep Apnea](https://www.nhlbi.nih.gov/health/sleep-apnea) - [Calculate Your BMI](https://www.nhlbi.nih.gov/calculate-your-bmi) - Health Education - [Education Programs and Initiatives](https://www.nhlbi.nih.gov/education) - [The Heart Truth®](https://www.nhlbi.nih.gov/health-topics/education-and-awareness/heart-truth) - [Learn More Breathe Better®](https://www.nhlbi.nih.gov/BreatheBetter) - [Blood Diseases & Disorders Education Program](https://www.nhlbi.nih.gov/education/blood) - [Publications and Resources](https://www.nhlbi.nih.gov/resources?language%5BEnglish%5D=English) - 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[Home](https://www.nhlbi.nih.gov/) - [\< Back To Health Topics](https://www.nhlbi.nih.gov/node/93751) - Arrhythmias 0 [Arrhythmias](https://www.nhlbi.nih.gov/health/arrhythmias) [MENU]() - [Home](https://www.nhlbi.nih.gov/) - [\< Back To Health Topics](https://www.nhlbi.nih.gov/node/93751) - Arrhythmias - [What Is an Arrhythmia?](https://www.nhlbi.nih.gov/health/arrhythmias) - [Types](https://www.nhlbi.nih.gov/health/arrhythmias/types) - [Symptoms](https://www.nhlbi.nih.gov/health/arrhythmias/symptoms) - [Diagnosis](https://www.nhlbi.nih.gov/health/arrhythmias/diagnosis) - [Causes and Triggers](https://www.nhlbi.nih.gov/health/arrhythmias/causes) - [Treatment](https://www.nhlbi.nih.gov/health/arrhythmias/treatment) - [Living With](https://www.nhlbi.nih.gov/health/arrhythmias/living-with) - [Related Conditions](https://www.nhlbi.nih.gov/health/arrhythmias) - [Conduction Disorders](https://www.nhlbi.nih.gov/health/conduction-disorders) - [Long QT Syndrome](https://www.nhlbi.nih.gov/health/long-qt-syndrome) - [Wolff-Parkinson-White Syndrome](https://www.nhlbi.nih.gov/health/wolff-parkinson-white-syndrome) MORE INFORMATION [Participate in a Study](https://www.nhlbi.nih.gov/research/clinical-trials?f%5B0%5D=disease_or_condition_name%3AArrhythmias) [Research](https://www.nhlbi.nih.gov/research/arrhythmias) Arrhythmias # Arrhythmias What Is an Arrhythmia? [![Share](https://www.nhlbi.nih.gov/themes/custom/nhlbi/images/share-alt-icon.svg)](https://www.addtoany.com/share#url=https%3A%2F%2Fwww.nhlbi.nih.gov%2Fhealth%2Farrhythmias&title=What%20Is%20an%20Arrhythmia%3F "Share") [Email](https://www.nhlbi.nih.gov/#email "Email") [Print](https://www.nhlbi.nih.gov/#print "Print") ## Language switcher - [English](https://www.nhlbi.nih.gov/health/arrhythmias) - [Español](https://www.nhlbi.nih.gov/es/salud/arritmias) Learn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia. [Medical Animation Copyright © Nucleus Medical Media, All rights reserved.](https://catalog.nucleusmedicalmedia.com/) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) An arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm. It is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other [symptoms](https://www.nhlbi.nih.gov/health/arrhythmias/symptoms). Arrhythmias are [treatable](https://www.nhlbi.nih.gov/health/arrhythmias/treatment) with medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening [stroke](https://www.nhlbi.nih.gov/health/stroke), [heart failure](https://www.nhlbi.nih.gov/health/heart-failure), or [cardiac arrest](https://www.nhlbi.nih.gov/health/cardiac-arrest). During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes. If you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from [getting worse](https://www.nhlbi.nih.gov/health/arrhythmias/living-with). ### Book traversal links for Arrhythmias - #### Next [Types](https://www.nhlbi.nih.gov/health/arrhythmias/types "Go to next page") Last updated on March 24, 2022 Back To Top Link [Back to top](https://www.nhlbi.nih.gov/health/arrhythmias#main-content) Web Policies & Notices - [Accessibility](https://www.nhlbi.nih.gov/about/contact/website-privacy-and-accessibility) - [No FEAR Act Data](https://eeo.nih.gov/no-fear-act) - [Privacy Policy](https://www.nhlbi.nih.gov/about/contact/website-privacy-and-accessibility/privacy-statement) - [Freedom of Information Act (FOIA)](https://www.nhlbi.nih.gov/about/contact/website-privacy-and-accessibility) - [HHS Vulnerability Disclosure](https://www.hhs.gov/vulnerability-disclosure-policy/index.html) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) Related Government Websites - [Health and Human Services](https://www.hhs.gov/) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) - [National Institutes of Health](https://www.nih.gov/) - [Office of the Inspector General](https://oig.hhs.gov/) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) - [USA.gov](https://www.usa.gov/) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) Stay Connected - ![chat bubbles](https://www.nhlbi.nih.gov/themes/custom/nhlbi/images/messages-question-regular.svg) [Live Chat](https://www.nhlbi.nih.gov/health/arrhythmias) Live Chat with us, Monday through Friday, 8:30 a.m. to 5:00 p.m. EST. - ![envelope](https://www.nhlbi.nih.gov/themes/custom/nhlbi/images/envelope-open-text-solid.svg)[Get Email Alerts](https://www.nhlbi.nih.gov/news-and-events/email-alerts) Receive automatic alerts about NHLBI related news and highlights from across the Institute. 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Readable Markdown	Learn about how problems with the cardiac conduction system cause the heart to have an abnormal rhythm called an arrhythmia. [Medical Animation Copyright © Nucleus Medical Media, All rights reserved.](https://catalog.nucleusmedicalmedia.com/) [(link is external)](https://www.nhlbi.nih.gov/health/arrhythmias) An arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat. Your heart may beat too quickly, too slowly, or with an irregular rhythm. It is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally. But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other [symptoms](https://www.nhlbi.nih.gov/health/arrhythmias/symptoms). Arrhythmias are [treatable](https://www.nhlbi.nih.gov/health/arrhythmias/treatment) with medicine or procedures to control the irregular rhythms. If not treated, arrhythmias can damage the heart, brain, or other organs. This can lead to life-threatening [stroke](https://www.nhlbi.nih.gov/health/stroke), [heart failure](https://www.nhlbi.nih.gov/health/heart-failure), or [cardiac arrest](https://www.nhlbi.nih.gov/health/cardiac-arrest). During cardiac arrest, the heart suddenly and unexpectedly stops beating, causing death if it is not treated within minutes. If you have been diagnosed with an arrhythmia, your doctor may talk to you about healthy lifestyle changes you can make. You may need to avoid activities that may trigger your arrhythmia. These steps may help prevent your arrhythmia from [getting worse](https://www.nhlbi.nih.gov/health/arrhythmias/living-with).
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