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Alterations in Blood Pressure01:30

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
Prepare for the Procedure:
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
Hypertension I: Introduction01:28

Hypertension I: Introduction

Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...

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Related Experiment Video

Updated: May 29, 2026

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

Nighttime blood pressure in cluster headache.

Sonia Santos Lasaosa1, Jorge Navarro Calzada, Alba Velázquez Benito

  • 1Department of Neurology, Clinical University Hospital Lozano Blesa, Zaragoza, Spain. ssantosl@yahoo.com

Headache
|September 3, 2011
PubMed
Summary

Cluster headache patients frequently exhibit a non-dipper blood pressure pattern, common in obstructive sleep apnea. This finding suggests a potential link between these two conditions.

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Published on: June 2, 2014

Area of Science:

  • Neurology
  • Cardiology
  • Sleep Medicine

Background:

  • Cluster headaches may be triggered by oxygen desaturation during apnea events.
  • Obstructive sleep apnea (OSA) is linked to increased cardiovascular risks.
  • Some OSA patients lack the normal nocturnal blood pressure dip.

Purpose of the Study:

  • To investigate the prevalence of the non-dipper blood pressure pattern in cluster headache patients.

Main Methods:

  • Ambulatory blood pressure monitoring was performed on 30 normotensive cluster headache patients.
  • Non-dippers were defined as having a nighttime blood pressure fall of less than 10%.

Main Results:

  • 50% of cluster headache patients were identified as non-dippers, a higher incidence than expected.
  • Nocturnal non-dipping correlated with higher body mass index and elevated nighttime systolic and diastolic blood pressure.
  • No significant differences in 24-hour or daytime blood pressure were observed.

Conclusions:

  • The high prevalence of the non-dipper pattern in cluster headache patients supports a potential relationship between cluster headaches and obstructive sleep apnea syndrome.