Fractional flow reserve - Revision history

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2025-03-09T02:56:46Z

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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
			<gallery>
			File:Image-ffr3.jpg\|Image-ffr3
			File:Image-Image-ffr4.jpg\|Image-Image-ffr4
			File:Ffr5.jpg\|Ffr5
			</gallery>

Prab at 01:26, 25 February 2025

2025-02-25T01:26:19Z

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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
	~~== Fractional_flow_reserve ==~~
	~~<gallery>~~
	~~File:Image-ffr3.jpg\|Image-ffr3~~
	~~File:Image-Image-ffr4.jpg\|Image-Image-ffr4~~
	~~File:Ffr5.jpg\|Ffr5~~
	~~</gallery>~~

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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
			== Fractional_flow_reserve ==
			<gallery>
			File:Image-ffr3.jpg\|Image-ffr3
			File:Image-Image-ffr4.jpg\|Image-Image-ffr4
			File:Ffr5.jpg\|Ffr5
			</gallery>

Prab at 23:56, 23 February 2025

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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
	~~== Fractional_flow_reserve ==~~
	~~<gallery>~~
	~~File:Image-ffr3.jpg\|Image-ffr3~~
	~~File:Image-Image-ffr4.jpg\|Image-Image-ffr4~~
	~~File:Ffr5.jpg\|Ffr5~~
	~~</gallery>~~

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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
			== Fractional_flow_reserve ==
			<gallery>
			File:Image-ffr3.jpg\|Image-ffr3
			File:Image-Image-ffr4.jpg\|Image-Image-ffr4
			File:Ffr5.jpg\|Ffr5
			</gallery>

Prab at 18:47, 21 February 2025

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	~~= Fractional Flow Reserve =~~

	~~[[File:Image-ffr3.jpg\|thumb\|right\|Diagram illustrating the concept of fractional flow reserve.]]~~

	'''Fractional Flow Reserve''' ('''FFR''') is a technique used in [[cardiology]] to measure the pressure differences across a [[coronary artery]] stenosis to assess the likelihood that the stenosis impedes oxygen delivery to the heart muscle. It is a valuable tool in the diagnosis and management of [[coronary artery disease]].		'''Fractional Flow Reserve''' ('''FFR''') is a technique used in [[cardiology]] to measure the pressure differences across a [[coronary artery]] stenosis to assess the likelihood that the stenosis impedes oxygen delivery to the heart muscle. It is a valuable tool in the diagnosis and management of [[coronary artery disease]].

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	The FFR procedure involves the insertion of a pressure wire into the coronary artery during [[angiography]]. The wire measures the pressure before and after a stenosis. The patient is often administered a [[vasodilator]] such as [[adenosine]] to induce maximal blood flow, allowing for accurate measurement of the pressure gradient across the stenosis.		The FFR procedure involves the insertion of a pressure wire into the coronary artery during [[angiography]]. The wire measures the pressure before and after a stenosis. The patient is often administered a [[vasodilator]] such as [[adenosine]] to induce maximal blood flow, allowing for accurate measurement of the pressure gradient across the stenosis.

	~~[[File:Image-Image-ffr4.jpg\|thumb\|left\|Pressure wire used in FFR measurement.]]~~

	== Clinical Significance ==		== Clinical Significance ==
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	While FFR is a powerful tool, it is not without limitations. It requires the use of adenosine, which can have side effects, and the procedure itself is invasive. Additionally, FFR measurements can be affected by technical factors such as wire drift and pressure damping.		While FFR is a powerful tool, it is not without limitations. It requires the use of adenosine, which can have side effects, and the procedure itself is invasive. Additionally, FFR measurements can be affected by technical factors such as wire drift and pressure damping.

	~~[[File:Ffr5.jpg\|thumb\|right\|Graph showing FFR values and corresponding clinical decisions.]]~~

	== Related pages ==		== Related pages ==

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	~~{{Short description\|A guide to understanding~~ Fractional Flow Reserve ~~in cardiology}}~~		= Fractional Flow Reserve =

	~~==Fractional Flow Reserve==~~		[[File:Image-ffr3.jpg\|thumb\|right\|Diagram illustrating the concept of fractional flow reserve.]]
	[[File:~~Coronary_artery_angiogram~~.jpg\|thumb\|right\|~~Coronary angiogram showing a stenosis in~~ the ~~left anterior descending artery~~.]]
	'''Fractional Flow Reserve''' ('''FFR''') is a diagnostic technique used in [[cardiology]] to assess the physiological impact of a coronary artery stenosis. It is a measure of the pressure differences across a coronary artery stenosis to determine the likelihood of the stenosis impeding oxygen delivery to the heart muscle.

	~~==Principle==~~		'''Fractional Flow Reserve''' ('''FFR''') is a technique used in [[cardiology]] to measure the pressure differences across a [[coronary artery]] stenosis to assess the likelihood that the stenosis impedes oxygen delivery to the heart muscle. It is a valuable tool in the diagnosis and management of [[coronary artery disease]].
	FFR is ~~based on~~ the ~~principle that the severity of~~ a coronary artery stenosis ~~can be quantified by measuring~~ the ~~pressure drop across~~ the stenosis ~~during maximal blood flow, which is induced pharmacologically~~. ~~The FFR value~~ is ~~calculated as~~ the ~~ratio~~ of ~~the maximum achievable blood flow in a diseased coronary artery to the theoretical maximum flow in a normal~~ coronary artery.

	==~~Procedure~~==		== Definition ==
	The procedure involves the insertion of a specialized pressure wire into the coronary artery during [[coronary angiography]]. A vasodilator, such as [[adenosine]], is administered to induce maximal hyperemia. The pressure distal to the stenosis is measured and compared to the aortic pressure. The FFR is calculated using the formula:

	~~: FFR = (Distal~~ coronary pressure~~) / (Aortic pressure)~~		Fractional Flow Reserve is defined as the ratio of the maximum achievable blood flow in a diseased coronary artery to the maximum achievable blood flow in a normal coronary artery. It is calculated during [[coronary catheterization]] using a specialized pressure wire.

	~~An FFR value of 0.80 or less is generally considered indicative of a hemodynamically significant stenosis, warranting intervention such as [[percutaneous coronary intervention]] (PCI).~~		== Procedure ==

	~~==Clinical Significance==~~		The FFR procedure involves the insertion of a pressure wire into the coronary artery during [[angiography]]. The wire measures the pressure before and after a stenosis. The patient is often administered a [[vasodilator]] such as [[adenosine]] to induce maximal blood flow, allowing for accurate measurement of the pressure gradient across the stenosis.
	FFR is a ~~valuable tool in~~ the ~~management of patients with~~ [[~~coronary artery disease~~]] ~~(CAD)~~. ~~It helps in decision-making regarding~~ the ~~need for revascularization procedures~~. ~~Studies have shown that FFR-guided PCI improves~~ patient ~~outcomes compared~~ to ~~angiography-guided PCI alone~~.

	~~==Advantages==~~		[[File:Image-Image-ffr4.jpg\|thumb\|left\|Pressure wire used in FFR measurement.]]
	* Provides a functional assessment of coronary stenosis.
	* Reduces unnecessary stenting by identifying lesions that do not require intervention.
	* Improves patient outcomes by guiding appropriate treatment.

	==~~Limitations~~==		== Clinical Significance ==
	* Requires the ~~use~~ of ~~pharmacological agents~~ to ~~induce hyperemia~~.
	* Invasive procedure ~~with associated risks~~.		FFR is used to determine the functional significance of coronary artery stenoses. An FFR value of 0.80 or less is generally considered indicative of a hemodynamically significant stenosis, which may benefit from [[percutaneous coronary intervention]] (PCI) or [[coronary artery bypass grafting]] (CABG).
	* May not be ~~applicable in certain anatomical situations,~~ such as ~~severe tortuosity or calcification~~.
			== Advantages ==

			FFR provides a more accurate assessment of the need for revascularization compared to angiography alone. It helps in avoiding unnecessary procedures and in optimizing patient outcomes by targeting interventions to lesions that are truly flow-limiting.

			== Limitations ==

			While FFR is a powerful tool, it is not without limitations. It requires the use of adenosine, which can have side effects, and the procedure itself is invasive. Additionally, FFR measurements can be affected by technical factors such as wire drift and pressure damping.

			[[File:Ffr5.jpg\|thumb\|right\|Graph showing FFR values and corresponding clinical decisions.]]

			== Related pages ==

	~~==Related pages==~~
	* [[Coronary artery disease]]		* [[Coronary artery disease]]
	* [[Percutaneous coronary intervention]]		* [[Percutaneous coronary intervention]]
	* [[Coronary ~~angiography~~]]		* [[Coronary artery bypass surgery]]
	* [[~~Adenosine~~]]		* [[Angiography]]

			== See also ==

			* [[Intravascular ultrasound]]
			* [[Optical coherence tomography]]

	[[Category:Cardiology]]		[[Category:Cardiology]]
			[[Category:Medical procedures]]

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← Older revision		Revision as of 17:33, 18 February 2025
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	~~'''~~Fractional Flow Reserve~~''' ('''FFR''') is a diagnostic technique used~~ in [[cardiology]] to measure the pressure differences across a [[coronary artery]] stenosis (narrowing) to assess the likelihood that the stenosis impedes oxygen delivery to the heart muscle (myocardial ischemia). This technique is instrumental in guiding decisions on the need for [[angioplasty]] or [[stenting]] in patients with coronary artery disease (CAD).		{{Short description\|A guide to understanding Fractional Flow Reserve in cardiology}}

	==~~Overview~~==		==Fractional Flow Reserve==
	Fractional Flow Reserve is ~~calculated during~~ a [[~~cardiac catheterization~~]] ~~procedure by measuring~~ the ~~blood~~ pressure ~~before and after~~ a coronary artery stenosis ~~using~~ a ~~specialized~~ pressure ~~wire~~. The FFR value is the ratio of the maximum achievable blood flow in a diseased coronary artery to the maximum ~~achievable~~ flow in a ~~hypothetical~~ normal coronary artery. An FFR of 1.0 is considered normal, indicating that the coronary artery can deliver blood as well as a normal artery would. An FFR of 0.80 or less is typically considered indicative of myocardial ischemia, suggesting that the stenosis may warrant revascularization.		[[File:Coronary_artery_angiogram.jpg\|thumb\|right\|Coronary angiogram showing a stenosis in the left anterior descending artery.]]
			'''Fractional Flow Reserve''' ('''FFR''') is a diagnostic technique used in [[cardiology]] to assess the physiological impact of a coronary artery stenosis. It is a measure of the pressure differences across a coronary artery stenosis to determine the likelihood of the stenosis impeding oxygen delivery to the heart muscle.

			==Principle==
			FFR is based on the principle that the severity of a coronary artery stenosis can be quantified by measuring the pressure drop across the stenosis during maximal blood flow, which is induced pharmacologically. The FFR value is calculated as the ratio of the maximum achievable blood flow in a diseased coronary artery to the theoretical maximum flow in a normal coronary artery.

	==Procedure==		==Procedure==
	~~The FFR measurement is performed in the catheterization laboratory.~~ The procedure involves ~~threading~~ a ~~guide catheter~~ into the coronary artery. A pressure ~~wire is then advanced through the catheter and placed beyond~~ the stenosis~~. Blood pressure~~ is measured ~~both before~~ and ~~after the stenosis while the patient is given a medication~~ to ~~induce [[hyperemia]] (increased blood flow), ensuring that~~ the ~~measurement reflects the coronary artery's capacity to deliver blood under conditions of high demand~~. The FFR is calculated ~~by dividing~~ the pressure ~~downstream~~ of ~~the~~ stenosis ~~by the pressure upstream~~.		The procedure involves the insertion of a specialized pressure wire into the coronary artery during [[coronary angiography]]. A vasodilator, such as [[adenosine]], is administered to induce maximal hyperemia. The pressure distal to the stenosis is measured and compared to the aortic pressure. The FFR is calculated using the formula:

			: FFR = (Distal coronary pressure) / (Aortic pressure)

			An FFR value of 0.80 or less is generally considered indicative of a hemodynamically significant stenosis, warranting intervention such as [[percutaneous coronary intervention]] (PCI).

	==Clinical Significance==		==Clinical Significance==
	FFR~~-guided percutaneous~~ coronary ~~intervention~~ (~~PCI~~) ~~has been~~ shown ~~to improve~~ patient outcomes compared to ~~traditional~~ angiography alone. By accurately identifying which lesions are responsible for ischemia, FFR allows for more targeted and appropriate use of interventions like stenting, potentially reducing the risk of unnecessary procedures and improving clinical outcomes.		FFR is a valuable tool in the management of patients with [[coronary artery disease]] (CAD). It helps in decision-making regarding the need for revascularization procedures. Studies have shown that FFR-guided PCI improves patient outcomes compared to angiography-guided PCI alone.

	==Advantages==		==Advantages==
	* ~~'''Accuracy:''' FFR provides~~ a ~~more precise~~ assessment of ~~the physiological impact of a~~ coronary ~~artery~~ stenosis ~~than angiography~~.		* Provides a functional assessment of coronary stenosis.
	* ~~'''Outcome Improvement:''' Studies have shown~~ that ~~FFR-guided PCI can lead to better patient outcomes, including reduced rates of death, myocardial infarction, and the need for urgent revascularization~~.		* Reduces unnecessary stenting by identifying lesions that do not require intervention.
	* ~~'''Cost-Effectiveness:''' By avoiding unnecessary stenting, FFR-guided~~ treatment ~~strategies can be more cost-effective for managing patients with CAD~~.		* Improves patient outcomes by guiding appropriate treatment.

	==Limitations==		==Limitations==
	* ~~'''~~Invasive ~~Procedure:''' FFR measurement requires cardiac catheterization, an invasive~~ procedure ~~that carries inherent~~ risks~~, though they are relatively low~~.		* Requires the use of pharmacological agents to induce hyperemia.
	* ~~'''Hyperemic Agents:''' The need for pharmacological induction of hyperemia can introduce variability in the measurement and may~~ not be ~~suitable for all patients.~~		* Invasive procedure with associated risks.
	* '''Interpretation:''' The interpretation of FFR values can be influenced by various factors, ~~including the presence of microvascular disease~~ or ~~the accuracy of the pressure measurements~~.		* May not be applicable in certain anatomical situations, such as severe tortuosity or calcification.

	==~~Conclusion~~==		==Related pages==
	~~Fractional Flow Reserve has emerged as a critical tool in the management of coronary~~ artery disease, enabling more precise and personalized treatment decisions. By focusing interventions on lesions that genuinely impair myocardial perfusion, FFR-guided strategies can improve patient outcomes and offer a more efficient use of healthcare resources.		* [[Coronary artery disease]]
			* [[Percutaneous coronary intervention]]
			* [[Coronary angiography]]
			* [[Adenosine]]

	[[Category:Cardiology]]		[[Category:Cardiology]]
	~~[[Category:Medical tests]]~~
	~~[[Category:Coronary artery disease]]~~

	~~{{Cardiology-stub}}~~
	~~<gallery>~~
	~~File:Image-ffr3.jpg\|Fractional flow reserve~~
	~~File:Image-Image-ffr4.jpg\|Fractional flow reserve~~
	~~File:Ffr5.jpg\|Fractional flow reserve~~
	~~</gallery>~~

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2025-02-18T01:23:17Z

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← Older revision		Revision as of 01:23, 18 February 2025
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	{{Cardiology-stub}}		{{Cardiology-stub}}
			<gallery>
			File:Image-ffr3.jpg\|Fractional flow reserve
			File:Image-Image-ffr4.jpg\|Fractional flow reserve
			File:Ffr5.jpg\|Fractional flow reserve
			</gallery>

← Older revision		Revision as of 02:56, 9 March 2025
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	[[Category:Cardiology]]		[[Category:Cardiology]]
	[[Category:Medical procedures]]		[[Category:Medical procedures]]
	~~<gallery>~~
	~~File:Image-ffr3.jpg\|Image-ffr3~~
	~~File:Image-Image-ffr4.jpg\|Image-Image-ffr4~~
	~~File:Ffr5.jpg\|Ffr5~~
	~~</gallery>~~